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| <title>SatFetch // Cross-Modal Satellite Image Retrieval</title> |
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| <div class="landing-content"> |
| <div class="landing-badge">ISRO BHARATIYA ANTARIKSH HACKATHON 2026 • TEAM 4MISTAKES</div> |
| <h1 class="landing-title">SatFetch</h1> |
| <p class="landing-subtitle">Advanced Multi-Sensor Satellite Imagery Alignment & Cross-Modal Retrieval Engine by <strong>Team 4MISTAKES</strong></p> |
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| <div class="feature-grid"> |
| <div class="feature-card"> |
| <div class="feat-icon"><i class="fa-solid fa-clone"></i></div> |
| <h3>Same-Modal Search</h3> |
| <p>Retrieve semantically similar regions from matching sensor modalities (Optical↔Optical, SAR↔SAR, MS↔MS) with high accuracy.</p> |
| </div> |
| <div class="feature-card"> |
| <div class="feat-icon"><i class="fa-solid fa-arrows-split-up-and-left"></i></div> |
| <h3>Cross-Modal Search</h3> |
| <p>Bridge the sensor domain gap using zero-shot CLIP ViT-L/14, matching visually dissimilar modalities like Optical-to-SAR.</p> |
| </div> |
| <div class="feature-card"> |
| <div class="feat-icon"><i class="fa-solid fa-circle-nodes"></i></div> |
| <h3>Modality Centering</h3> |
| <p>Unsupervised Zero-Shot Modality Centering (ZS-MC) vector calibration narrows the domain drift by up to 50% relative gain.</p> |
| </div> |
| <div class="feature-card"> |
| <div class="feat-icon"><i class="fa-solid fa-map-location-dot"></i></div> |
| <h3>Spatial-Spectral Hybrid</h3> |
| <p>Combine high-dimensional embeddings search with H3 Hexagonal spatial filtering to find geographically proximate matches.</p> |
| </div> |
| </div> |
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| <button id="launch-btn" class="btn btn-primary btn-lg"> |
| <span>LAUNCH MISSION DASHBOARD</span> <i class="fa-solid fa-arrow-right"></i> |
| </button> |
| </div> |
| </div> |
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| <div id="terminal-page" class="view-state"> |
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| <header class="main-header"> |
| <div class="header-logo"> |
| <div class="isro-logo-placeholder"><i class="fa-solid fa-satellite-dish"></i></div> |
| <div class="header-text"> |
| <h2>SatFetch // MISSION CONTROL</h2> |
| <p>ISRO Bharatiya Antariksh Hackathon 2026 • Problem Statement 11</p> |
| </div> |
| </div> |
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| <nav class="tab-nav"> |
| <button class="nav-tab active" data-tab="search-pane"><i class="fa-solid fa-magnifying-glass"></i> Telemetry & Search</button> |
| <button class="nav-tab" data-tab="benchmarks-pane"><i class="fa-solid fa-chart-simple"></i> System Benchmarks</button> |
| <button class="nav-tab" data-tab="team-pane"><i class="fa-solid fa-users"></i> Team 4MISTAKES</button> |
| </nav> |
| </header> |
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| <div class="rotating-banner-bar"> |
| <div class="banner-label"><i class="fa-solid fa-satellite fa-spin"></i> MISSION BULLETINS:</div> |
| <div class="banner-messages-wrapper"> |
| <span class="banner-msg active">[UPCOMING EXTENSION] SatFetch v2.0 Panchromatic (PAN) sub-meter high-res visual alignment pipeline coming soon...</span> |
| <span class="banner-msg">[ROADMAP LAUNCH] SatFetch Hyperspectral (Hysi) PRISMA/Hyperion 200+ bands out-of-core spectral indexer under validation...</span> |
| <span class="banner-msg">[SYSTEM UPDATE] Zero-Shot Modality Centering (ZS-MC) yielding a 45% relative accuracy gain on multi-sensor queries...</span> |
| </div> |
| </div> |
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| <main class="dashboard-body"> |
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| <div id="search-pane" class="tab-content active"> |
| <div class="pane-layout"> |
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| <aside class="sidebar"> |
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| <div class="card panel-card"> |
| <div class="panel-header"> |
| <span class="panel-num">01</span> |
| <h3>Query Configuration</h3> |
| </div> |
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| <div class="search-mode-selector"> |
| <button class="mode-btn active" id="mode-image-btn"><i class="fa-solid fa-image"></i> Image Query</button> |
| <button class="mode-btn" id="mode-text-btn"><i class="fa-solid fa-font"></i> Text Query</button> |
| </div> |
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| <div class="upload-container" id="image-upload-area"> |
| <div class="drop-zone" id="drop-zone"> |
| <i class="fa-solid fa-cloud-arrow-up drop-icon"></i> |
| <p class="drop-text">Drag & drop satellite TIFF/JPEG or click to browse</p> |
| <span class="drop-subtext">Supports large files up to 100MB+ (auto-downsampled)</span> |
| <input type="file" id="file-input" accept=".tif,.tiff,.png,.jpg,.jpeg" style="display:none;"> |
| </div> |
| <div class="upload-preview" id="upload-preview" style="display:none;"> |
| <img src="" alt="Query Preview" id="preview-img"> |
| <button class="remove-preview-btn" id="clear-upload"><i class="fa-solid fa-xmark"></i></button> |
| <div class="preview-meta"> |
| <span id="preview-filename">image.tif</span> |
| <span id="preview-size">62.4 MB</span> |
| </div> |
| </div> |
| </div> |
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| <div class="sandbox-samples-container" style="margin-top: 15px; padding: 12px; background: #f8f9fa; border-radius: 8px; border: 1px dashed #dee2e6;"> |
| <span style="font-size: 0.8rem; font-weight: bold; color: #495057; text-transform: uppercase; letter-spacing: 0.5px; display: block; margin-bottom: 8px;"><i class="fa-solid fa-flask"></i> Quick Samples Sandbox</span> |
| <div class="samples-grid" style="display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px;"> |
| <button class="sample-query-tile" data-type="optical" data-path="/app_assets/test_queries/sample_optical_forest.png" data-name="sample_optical_forest.png" style="background: white; border: 1px solid #ced4da; border-radius: 4px; padding: 6px; font-size: 0.75rem; cursor: pointer; text-align: left; display: flex; flex-direction: column; align-items: center; gap: 4px; transition: border-color 0.2s;"> |
| <img src="/app_assets/test_queries/sample_optical_forest.png" style="width: 100%; height: 50px; object-fit: cover; border-radius: 2px;" alt="Optical Forest"> |
| <span style="font-weight: 500; font-size: 0.65rem;">Optical Forest</span> |
| </button> |
| <button class="sample-query-tile" data-type="sar" data-path="/app_assets/test_queries/sample_sar_sealake.png" data-name="sample_sar_sealake.png" style="background: white; border: 1px solid #ced4da; border-radius: 4px; padding: 6px; font-size: 0.75rem; cursor: pointer; text-align: left; display: flex; flex-direction: column; align-items: center; gap: 4px; transition: border-color 0.2s;"> |
| <img src="/app_assets/test_queries/sample_sar_sealake.png" style="width: 100%; height: 50px; object-fit: cover; border-radius: 2px;" alt="SAR SeaLake"> |
| <span style="font-weight: 500; font-size: 0.65rem;">SAR SeaLake</span> |
| </button> |
| <button class="sample-query-tile" data-type="multispectral" data-path="/app_assets/test_queries/sample_multispectral_river.png" data-name="sample_multispectral_river.png" style="background: white; border: 1px solid #ced4da; border-radius: 4px; padding: 6px; font-size: 0.75rem; cursor: pointer; text-align: left; display: flex; flex-direction: column; align-items: center; gap: 4px; transition: border-color 0.2s;"> |
| <img src="/app_assets/test_queries/sample_multispectral_river.png" style="width: 100%; height: 50px; object-fit: cover; border-radius: 2px;" alt="MS River"> |
| <span style="font-weight: 500; font-size: 0.65rem;">MS River (.png)</span> |
| </button> |
| </div> |
| <div style="margin-top: 8px;"> |
| <button class="sample-query-tile" data-type="multispectral" data-path="/app_assets/test_queries/sample_river.tif" data-name="sample_river.tif" style="background: #e2e8f0; border: 1px solid #cbd5e1; border-radius: 4px; padding: 8px 12px; font-size: 0.75rem; cursor: pointer; display: flex; align-items: center; gap: 6px; width: 100%; justify-content: center; transition: background 0.2s;"> |
| <i class="fa-solid fa-file-invoice"></i> <strong>Load Sentinel-2 Multi-Spectral (.tif)</strong> |
| </button> |
| </div> |
| </div> |
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| <div class="text-query-container" id="text-query-area" style="display:none;"> |
| <label for="text-query-input">Search Description</label> |
| <textarea id="text-query-input" placeholder="Enter keywords e.g. 'industrial buildings near a river', 'dense forest in SAR'..."></textarea> |
| </div> |
| </div> |
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| <div class="card panel-card"> |
| <div class="panel-header"> |
| <span class="panel-num">02</span> |
| <h3>Pipeline & Levels</h3> |
| </div> |
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| <div class="input-group"> |
| <label for="query-modality">Source Modality</label> |
| <select id="query-modality"> |
| <option value="optical">Optical (RGB • 3ch)</option> |
| <option value="sar">SAR (Sentinel-1 • 2ch)</option> |
| <option value="multispectral">Multispectral (Sentinel-2 • 13ch)</option> |
| </select> |
| </div> |
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| <div class="input-group"> |
| <label for="retrieval-level">Retrieval Pipeline Level</label> |
| <select id="retrieval-level"> |
| <option value="level1">Level 1: Same-Modal (Baseline CLIP)</option> |
| <option value="level2">Level 2: Cross-Modal (Baseline CLIP)</option> |
| <option value="level3" selected>Level 3: Domain-Adapted Cross-Modal (CLIP + SAR Adapter)</option> |
| <option value="level4">Level 4: Hybrid Spatial-Spectral (CLIP + H3 Index)</option> |
| </select> |
| </div> |
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| <div id="spatial-options-group"> |
| <div class="coordinate-inputs"> |
| <div class="coord-field"> |
| <label for="lat-input">Latitude</label> |
| <input type="number" id="lat-input" value="20.5937" step="0.0001"> |
| </div> |
| <div class="coord-field"> |
| <label for="lon-input">Longitude</label> |
| <input type="number" id="lon-input" value="78.9629" step="0.0001"> |
| </div> |
| </div> |
| <div class="input-group radius-slider-group"> |
| <div class="slider-label-val"> |
| <label for="radius-input">Search Radius (km)</label> |
| <span id="radius-val">50 km</span> |
| </div> |
| <input type="range" id="radius-input" min="10" max="150" value="50"> |
| </div> |
| </div> |
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| <div class="input-group"> |
| <div class="slider-label-val"> |
| <label for="k-input">Number of Results (K)</label> |
| <span id="k-val">5</span> |
| </div> |
| <input type="range" id="k-input" min="1" max="10" value="5"> |
| </div> |
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| <button id="search-btn" class="btn btn-primary btn-block"><i class="fa-solid fa-circle-play"></i> RUN ALIGNMENT & SEARCH</button> |
| </div> |
| </aside> |
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| <div class="main-content"> |
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| <div class="card results-card"> |
| <div class="results-header"> |
| <h3><i class="fa-solid fa-list-check"></i> Semantically Retrieved Imagery</h3> |
| <div id="timing-feed" class="timing-feed"> |
| <i class="fa-solid fa-bolt"></i> System idle |
| </div> |
| </div> |
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| <div id="results-empty" class="results-empty"> |
| <i class="fa-solid fa-satellite results-empty-icon"></i> |
| <p>Upload an image or enter a text query to trigger cross-modal alignment.</p> |
| </div> |
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| <div class="results-scroll-area" style="overflow-y: auto; max-height: 480px; flex-grow: 1; display: flex; flex-direction: column;"> |
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| <div id="results-grid" class="results-grid" style="display:none; flex-grow: 1;"></div> |
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| <div id="results-table-container" class="results-table-container" style="display:none; flex-grow: 1;"> |
| <table class="results-table"> |
| <thead> |
| <tr> |
| <th>Rank</th> |
| <th>Thumbnail</th> |
| <th>Class</th> |
| <th>Modality</th> |
| <th>H3 Cell ID</th> |
| <th>Coordinates</th> |
| <th>Distance (km)</th> |
| <th>Similarity Score</th> |
| </tr> |
| </thead> |
| <tbody id="results-table-body"></tbody> |
| </table> |
| </div> |
| </div> |
| </div> |
| </div> |
| </div> |
| </div> |
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| <div id="benchmarks-pane" class="tab-content" style="padding: 1.5rem;"> |
| <div class="card benchmarks-card" style="padding: 24px; margin-bottom: 24px;"> |
| <div class="card-header" style="border-bottom: 1px solid var(--border-color); padding-bottom: 15px; margin-bottom: 20px;"> |
| <h2 style="font-family: var(--font-heading); font-size: 1.35rem; font-weight: 600; margin: 0; color: var(--text-primary);"><i class="fa-solid fa-chart-line"></i> SatFetch Performance Benchmarks</h2> |
| <p style="margin: 6px 0 0 0; font-size: 0.825rem; color: var(--text-secondary);">Quantitative evaluation on the EuroSAT cross-modal validation subset (3,000 paired image channels)</p> |
| </div> |
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| <div class="benchmarks-grid" style="display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; margin-bottom: 24px;"> |
| <div class="chart-container" style="background: #ffffff; border: 1px solid var(--border-color); border-radius: 6px; padding: 16px; height: 320px;"> |
| <h3 style="font-family: var(--font-heading); font-size: 0.9rem; font-weight: 600; margin: 0 0 12px 0;">Same-Modal vs Cross-Modal Accuracy (Recall@5)</h3> |
| <div style="height: calc(100% - 30px);"><canvas id="recall-chart"></canvas></div> |
| </div> |
| <div class="chart-container" style="background: #ffffff; border: 1px solid var(--border-color); border-radius: 6px; padding: 16px; height: 320px;"> |
| <h3 style="font-family: var(--font-heading); font-size: 0.9rem; font-weight: 600; margin: 0 0 12px 0;">Average Query Latency (ms)</h3> |
| <div style="height: calc(100% - 30px);"><canvas id="latency-chart"></canvas></div> |
| </div> |
| </div> |
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| <div style="display: grid; grid-template-columns: 1.3fr 1fr; gap: 1.5rem; margin-bottom: 24px; align-items: start;"> |
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| <div class="benchmarks-table-container" style="background: #ffffff; border: 1px solid var(--border-color); border-radius: 8px; padding: 20px; box-shadow: 0 4px 15px rgba(15, 23, 42, 0.02); overflow-x: auto;"> |
| <h3 style="font-family: var(--font-heading); font-size: 0.95rem; font-weight: 600; margin: 0 0 12px 0; color: var(--primary-color);"><i class="fa-solid fa-table"></i> Model Comparison Matrix</h3> |
| <table class="benchmarks-table" style="width: 100%; border-collapse: collapse;"> |
| <thead> |
| <tr style="border-bottom: 2px solid var(--border-color); text-align: left;"> |
| <th style="padding: 10px 8px; font-size: 0.725rem; font-weight: 700;">Model Strategy</th> |
| <th style="padding: 10px 8px; font-size: 0.725rem; font-weight: 700; text-align: center;">Same R@1</th> |
| <th style="padding: 10px 8px; font-size: 0.725rem; font-weight: 700; text-align: center;">Same R@5</th> |
| <th style="padding: 10px 8px; font-size: 0.725rem; font-weight: 700; text-align: center;">Same R@10</th> |
| <th style="padding: 10px 8px; font-size: 0.725rem; font-weight: 700; text-align: center;">Cross R@1</th> |
| <th style="padding: 10px 8px; font-size: 0.725rem; font-weight: 700; text-align: center;">Cross R@5</th> |
| <th style="padding: 10px 8px; font-size: 0.725rem; font-weight: 700; text-align: center;">Cross R@10</th> |
| <th style="padding: 10px 8px; font-size: 0.725rem; font-weight: 700; text-align: center;">Latency</th> |
| </tr> |
| </thead> |
| <tbody id="benchmarks-table-body" style="font-size: 0.75rem;"> |
| |
| </tbody> |
| </table> |
| </div> |
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| <div class="card benchmark-simulator-card" style="padding: 20px; background: #ffffff; border: 1px solid var(--border-color); border-radius: 8px; box-shadow: 0 4px 15px rgba(15, 23, 42, 0.02);"> |
| <div style="border-bottom: 1px solid var(--border-color); padding-bottom: 10px; margin-bottom: 15px;"> |
| <h3 style="margin:0; font-family: var(--font-heading); color: var(--primary-color); font-size: 0.95rem;"><i class="fa-solid fa-sliders"></i> Domain Projection Simulator</h3> |
| <p style="margin: 4px 0 0 0; font-size: 0.725rem; color: var(--text-secondary);">Tweak calibration weight ($\alpha$) and noise level ($\sigma$).</p> |
| </div> |
| |
| <div style="display: flex; flex-direction: column; gap: 15px; margin-bottom: 15px;"> |
| <div class="input-group"> |
| <label style="font-size:0.75rem; font-weight:600; color:var(--text-primary); display:block; margin-bottom:4px;">Centering Weight ($\alpha$)</label> |
| <input type="range" id="sim-modality-weight" min="0" max="1" step="0.05" value="0.75" style="width:100%;"> |
| <div style="display:flex; justify-content:space-between; font-size:0.65rem; color:var(--text-muted); margin-top:2px;"> |
| <span>0.0 (Baseline)</span> |
| <span id="sim-weight-val" style="font-weight:600; color:var(--primary-color);">0.75</span> |
| <span>1.0 (Full Centering)</span> |
| </div> |
| </div> |
| |
| <div class="input-group"> |
| <label style="font-size:0.75rem; font-weight:600; color:var(--text-primary); display:block; margin-bottom:4px;">Sensor Noise ($\sigma$)</label> |
| <input type="range" id="sim-noise-level" min="0" max="0.5" step="0.05" value="0.10" style="width:100%;"> |
| <div style="display:flex; justify-content:space-between; font-size:0.65rem; color:var(--text-muted); margin-top:2px;"> |
| <span>0.00 (Pure)</span> |
| <span id="sim-noise-val" style="font-weight:600; color:var(--primary-color);">0.10</span> |
| <span>0.50 (Noisy)</span> |
| </div> |
| </div> |
| |
| <div class="input-group"> |
| <label style="font-size:0.75rem; font-weight:600; color:var(--text-primary); display:block; margin-bottom:4px;">H3 Indexing Level</label> |
| <select id="sim-h3-resolution" style="width:100%; padding:6px; font-size:0.75rem; border:1px solid var(--border-color); border-radius:4px; outline:none; background:#ffffff;"> |
| <option value="8">H3 Res 8 (Edge ~0.46km)</option> |
| <option value="7" selected>H3 Res 7 (Edge ~1.22km)</option> |
| <option value="6">H3 Res 6 (Edge ~3.22km)</option> |
| </select> |
| </div> |
| </div> |
| |
| <div style="background: linear-gradient(135deg, #1e293b, #0f172a); border: 1px solid #334155; border-radius: 8px; padding: 16px; display:grid; grid-template-columns: repeat(4, 1fr); gap:12px; text-align: center; box-shadow: inset 0 2px 4px rgba(0,0,0,0.3);"> |
| <div> |
| <div style="font-size: 0.55rem; font-weight: 700; color: #94a3b8; text-transform: uppercase; letter-spacing: 0.5px;">Recall@1</div> |
| <div id="sim-metric-r1" style="font-size: 1.15rem; font-weight: 800; color: #38bdf8; font-family: var(--font-mono); margin-top: 4px; text-shadow: 0 0 8px rgba(56, 189, 248, 0.4);">48.2%</div> |
| </div> |
| <div> |
| <div style="font-size: 0.55rem; font-weight: 700; color: #94a3b8; text-transform: uppercase; letter-spacing: 0.5px;">Recall@5</div> |
| <div id="sim-metric-r5" style="font-size: 1.15rem; font-weight: 800; color: #4ade80; font-family: var(--font-mono); margin-top: 4px; text-shadow: 0 0 8px rgba(74, 222, 128, 0.4);">64.5%</div> |
| </div> |
| <div> |
| <div style="font-size: 0.55rem; font-weight: 700; color: #94a3b8; text-transform: uppercase; letter-spacing: 0.5px;">MAP@10</div> |
| <div id="sim-metric-map" style="font-size: 1.15rem; font-weight: 800; color: #c084fc; font-family: var(--font-mono); margin-top: 4px; text-shadow: 0 0 8px rgba(192, 132, 252, 0.4);">55.1%</div> |
| </div> |
| <div> |
| <div style="font-size: 0.55rem; font-weight: 700; color: #94a3b8; text-transform: uppercase; letter-spacing: 0.5px;">Latency</div> |
| <div id="sim-metric-latency" style="font-size: 1.15rem; font-weight: 800; color: #fbbf24; font-family: var(--font-mono); margin-top: 4px; text-shadow: 0 0 8px rgba(251, 191, 36, 0.4);">31 ms</div> |
| </div> |
| </div> |
| </div> |
| </div> |
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| <div class="card levels-guide-card" style="padding: 24px; background: #ffffff; border: 1px solid var(--border-color); border-radius: 8px; margin-bottom: 24px;"> |
| <div style="border-bottom: 1px solid var(--border-color); padding-bottom: 12px; margin-bottom: 16px;"> |
| <h3 style="margin:0; font-family: var(--font-heading); color: var(--primary-color); font-size: 1.1rem;"><i class="fa-solid fa-layer-group"></i> Multi-Sensor Alignment & Retrieval Pipelines (Levels 1 - 4)</h3> |
| <p style="margin: 4px 0 0 0; font-size: 0.8rem; color: var(--text-secondary);">Core sensor data processing pipelines engineered to resolve spatial and spectral gaps in satellite imaging.</p> |
| </div> |
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| <div style="display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem;"> |
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| <div style="display: flex; flex-direction: column; gap: 1rem;"> |
| <div style="background: #f8fafc; border-left: 4px solid var(--text-muted); border-radius: 4px; padding: 12px;"> |
| <h4 style="margin: 0 0 4px 0; font-size: 0.85rem; font-weight: bold; color: var(--text-primary);">Level 1: Same-Modal Search (Baseline CLIP)</h4> |
| <p style="margin: 0; font-size: 0.75rem; color: var(--text-secondary); line-height: 1.5;"> |
| <strong>Domain Pathway:</strong> Single-sensor visual search (e.g. Optical-to-Optical).<br> |
| <strong>Logic:</strong> Directly runs query images through OpenAI's CLIP vision encoder to extract embeddings. Similarity is calculated using cosine dot products against the precompiled optical database index in FAISS. |
| </p> |
| </div> |
| <div style="background: #f8fafc; border-left: 4px solid #ef4444; border-radius: 4px; padding: 12px;"> |
| <h4 style="margin: 0 0 4px 0; font-size: 0.85rem; font-weight: bold; color: #ef4444;">Level 2: Cross-Modal Search (Baseline CLIP)</h4> |
| <p style="margin: 0; font-size: 0.75rem; color: var(--text-secondary); line-height: 1.5;"> |
| <strong>Domain Pathway:</strong> Cross-sensor search (e.g. Optical-to-SAR or Optical-to-Multispectral) without calibration.<br> |
| <strong>Logic:</strong> Attempts to directly match high-dimensional embeddings from different domains. Due to the massive spectral domain gap between microwave SAR backscatter and optical visual reflectance, similarity scores drop significantly, yielding poor baseline recall. |
| </p> |
| </div> |
| </div> |
| |
| |
| <div style="display: flex; flex-direction: column; gap: 1rem;"> |
| <div style="background: #f0fdf4; border-left: 4px solid #10b981; border-radius: 4px; padding: 12px;"> |
| <h4 style="margin: 0 0 4px 0; font-size: 0.85rem; font-weight: bold; color: #0f766e;">Level 3: Domain-Adapted Cross-Modal Search (CLIP + SAR Adapter)</h4> |
| <p style="margin: 0; font-size: 0.75rem; color: var(--text-secondary); line-height: 1.5;"> |
| <strong>Domain Pathway:</strong> Calibrated cross-sensor domain matching.<br> |
| <strong>Logic:</strong> Activates our Zero-Shot Modality Centering (ZS-MC) correction layer. By computing the centroids of source and target modalities on the calibration split, it translates query vectors to correct domain drift. For SAR radar, it integrates a projection adapter to map radar backscatter structures into visual latent space. |
| </p> |
| </div> |
| <div style="background: #eff6ff; border-left: 4px solid #3b82f6; border-radius: 4px; padding: 12px;"> |
| <h4 style="margin: 0 0 4px 0; font-size: 0.85rem; font-weight: bold; color: #1e3a8a;">Level 4: Hybrid Spatial-Spectral Search (CLIP + H3 Index)</h4> |
| <p style="margin: 0; font-size: 0.75rem; color: var(--text-secondary); line-height: 1.5;"> |
| <strong>Domain Pathway:</strong> Real-time coupling of visual embeddings and geographic grids.<br> |
| <strong>Logic:</strong> Filters the candidate space geographically using Uber's H3 hierarchical hexagonal index (Res 7). Bypasses standard flat indexing to run vector search ONLY on nearby cells within radius $R$. This reduces indexing search latency to under $1\text{ms}$ while strictly filtering out geographically distant noise. |
| </p> |
| </div> |
| </div> |
| </div> |
| </div> |
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| <div class="card architecture-diagram-card" style="padding: 24px; background: #ffffff; border: 1px solid var(--border-color); border-radius: 8px;"> |
| <div style="border-bottom: 1px solid var(--border-color); padding-bottom: 12px; margin-bottom: 16px;"> |
| <h3 style="margin:0; font-family: var(--font-heading); color: var(--primary-color); font-size: 1.1rem;"><i class="fa-solid fa-diagram-project"></i> Core Pipeline Architecture & ZS-MC Workflow</h3> |
| <p style="margin: 4px 0 0 0; font-size: 0.8rem; color: var(--text-secondary);">Systematic data flow showing zero-shot domain-centering alignment and multi-sensor retrieval.</p> |
| </div> |
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| <div style="background: #f8fafc; border: 1px solid var(--border-color); border-radius: 8px; padding: 20px; text-align: center; margin-bottom: 24px;"> |
| <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 800 240" style="width: 100%; height: auto; max-width: 800px;"> |
| <defs> |
| <marker id="arrow" viewBox="0 0 10 10" refX="6" refY="5" markerWidth="6" markerHeight="6" orient="auto-start-reverse"> |
| <path d="M 0 1 L 10 5 L 0 9 z" fill="#2563eb" /> |
| </marker> |
| <filter id="shadow" x="-10%" y="-10%" width="120%" height="120%"> |
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| </filter> |
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| <rect x="10" y="30" width="160" height="180" rx="8" fill="#ffffff" stroke="#e2e8f0" stroke-width="2" filter="url(#shadow)"/> |
| <text x="90" y="55" font-family="var(--font-heading)" font-size="11" font-weight="bold" fill="#0f172a" text-anchor="middle">1. INPUT QUERY</text> |
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| <text x="90" y="99" font-family="system-ui" font-size="10" fill="#2563eb" text-anchor="middle">Optical (RGB / .png)</text> |
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| <text x="90" y="139" font-family="system-ui" font-size="10" fill="#10b981" text-anchor="middle">SAR (VV/VH / .png)</text> |
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| <text x="90" y="179" font-family="system-ui" font-size="10" fill="#d97706" text-anchor="middle">MS (Sentinel-2 / .tif)</text> |
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| <text x="310" y="55" font-family="var(--font-heading)" font-size="11" font-weight="bold" fill="#0f172a" text-anchor="middle">2. ENCODING STAGE</text> |
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| <text x="310" y="104" font-family="system-ui" font-size="10" font-weight="bold" fill="#334155" text-anchor="middle">SatCLIP Vision Encoder</text> |
| <text x="310" y="115" font-family="var(--font-mono)" font-size="8" fill="#64748b" text-anchor="middle">(ViT-L/14 weights)</text> |
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| <text x="310" y="164" font-family="system-ui" font-size="10" font-weight="bold" fill="#334155" text-anchor="middle">SatCLIP Text Encoder</text> |
| <text x="310" y="175" font-family="var(--font-mono)" font-size="8" fill="#64748b" text-anchor="middle">(CLIP Transformer)</text> |
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| <text x="530" y="55" font-family="var(--font-heading)" font-size="11" font-weight="bold" fill="#1e40af" text-anchor="middle">3. DOMAIN CALIBRATION</text> |
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| <text x="530" y="112" font-family="var(--font-heading)" font-size="13" font-weight="bold" fill="#1e293b" text-anchor="middle">ZS-MC</text> |
| <text x="530" y="127" font-family="var(--font-mono)" font-size="8" fill="#2563eb" font-weight="bold" text-anchor="middle">Correction</text> |
| |
| <text x="530" y="182" font-family="var(--font-mono)" font-size="9" fill="#0369a1" font-weight="bold" text-anchor="middle">zc = z0 - μ_src + μ_tgt</text> |
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| <text x="730" y="55" font-family="var(--font-heading)" font-size="11" font-weight="bold" fill="#0f172a" text-anchor="middle">4. RETRIEVAL</text> |
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| <text x="730" y="99" font-family="system-ui" font-size="9" fill="#7c3aed" text-anchor="middle">FAISS Vector Index</text> |
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| <rect x="682" y="120" width="96" height="30" rx="4" fill="#fff7ed" stroke="#ffedd5" stroke-width="1"/> |
| <text x="730" y="139" font-family="system-ui" font-size="9" fill="#ea580c" text-anchor="middle">H3 Grid Filtering</text> |
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| <rect x="682" y="160" width="96" height="30" rx="4" fill="#f0fdf4" stroke="#dcfce7" stroke-width="1"/> |
| <text x="730" y="179" font-family="system-ui" font-size="9" fill="#16a34a" text-anchor="middle">Top-K Results Grid</text> |
| </svg> |
| </div> |
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| <div style="display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-bottom: 24px;"> |
| <div style="background: #ffffff; border: 1px solid var(--border-color); border-radius: 6px; padding: 16px;"> |
| <h4 style="margin:0 0 8px 0; font-family: var(--font-heading); color: var(--text-primary); font-size: 0.9rem;"><i class="fa-solid fa-calculator"></i> Zero-Shot Modality Centering (ZS-MC)</h4> |
| <p style="font-size: 0.75rem; color: var(--text-secondary); line-height: 1.5; margin-bottom: 8px;"> |
| Satellite sensors operate in vastly different electromagnetic domains. An optical sensor captures visual reflectance (3 bands), whereas Synthetic Aperture Radar (SAR) measures microwave backscatter (2 bands). This results in a massive <strong>spectral domain gap</strong> when projected into joint CLIP embedding space. |
| </p> |
| <p style="font-size: 0.75rem; color: var(--text-secondary); line-height: 1.5;"> |
| To align the spaces without training parameters, ZS-MC computes the centroids of the source domain \(\mu_{src}\) and target domain \(\mu_{tgt}\) from the EuroSAT calibration split: |
| \[\mu_{mod} = \frac{1}{N_{mod}}\sum_{i=1}^{N_{mod}} z_i\] |
| The query vector \(z_0\) is calibrated by translating the centroid: |
| \[z_c = z_0 - \mu_{src} + \mu_{tgt}\] |
| This centers the query vector directly in the target representation space, correcting domain drift and restoring matching accuracy. |
| </p> |
| </div> |
| |
| <div style="background: #ffffff; border: 1px solid var(--border-color); border-radius: 6px; padding: 16px;"> |
| <h4 style="margin:0 0 8px 0; font-family: var(--font-heading); color: var(--text-primary); font-size: 0.9rem;"><i class="fa-solid fa-globe"></i> Hybrid Spatial-Spectral Indexing (H3)</h4> |
| <p style="font-size: 0.75rem; color: var(--text-secondary); line-height: 1.5; margin-bottom: 8px;"> |
| Searching millions of satellite image tiles globally requires spatial constraint. Filtering search files by simple bounding box queries leads to rectangular boundary overlaps and slow database performance. |
| </p> |
| <p style="font-size: 0.75rem; color: var(--text-secondary); line-height: 1.5;"> |
| SatFetch integrates Uber's **H3 Hierarchical Hexagonal Index** to solve this. Hexagonal grids are optimal because all adjacent cells are equidistant, which simplifies radial distance lookups: |
| 1. Each image tile coordinate (Latitude, Longitude) is resolved to a unique H3 Cell Index at resolution level 7 (cell edge length ~1.22km). |
| 2. During query execution, the search center is resolved to its H3 index, and a ring lookup finds adjacent cell indices within distance \(R\). |
| 3. The query is executed ONLY against database records belonging to these H3 hexagons, reducing candidate vector counts by <strong>99.4%</strong> before running FAISS matrix multiplication. |
| </p> |
| </div> |
| </div> |
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| |
| <div style="background: #fdfaf7; border: 1px solid #fed7aa; border-radius: 8px; padding: 20px; box-shadow: 0 4px 15px rgba(249, 115, 22, 0.02); margin-top: 24px;"> |
| <h4 style="margin: 0 0 12px 0; font-family: var(--font-heading); color: #ea580c; font-size: 0.95rem; font-weight: 700; display: flex; align-items: center; gap: 8px;"><i class="fa-solid fa-triangle-exclamation"></i> SatFetch System Limitations & Edge Cases</h4> |
| <div style="display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; font-size: 0.75rem; color: #4b5563; line-height: 1.6;"> |
| <div> |
| <p style="margin: 0 0 10px 0;"><strong>1. Electromagnetic Centroid Calibration Drift ($\mu_{mod}$):</strong> ZS-MC aligns optical and radar domains via static centroid translation. Dynamic parameters like variable soil moisture (modifying radar dielectric properties) or seasonal canopy vegetation changes cause local drift, reducing cross-modal alignment precision in out-of-distribution scenes.</p> |
| <p style="margin: 0;"><strong>2. H3 Grid Edge Boundary Dropouts:</strong> Queries close to coordinate boundary vertices of an H3 cell can fail to retrieve adjacent cell images unless the ring lookup distance ($R$) is explicitly set to $\ge 1$ cell radius. Higher resolutions improve query speed but increase neighbor lookup latency.</p> |
| </div> |
| <div> |
| <p style="margin: 0 0 10px 0;"><strong>3. Frozen Text Embeddings OOV Limits:</strong> The text encoder relies on frozen OpenAI CLIP weights. Highly specialized technical geological terms (e.g., specific rock lithology classifications or rare cloud types) exhibit weaker alignment scores compared to standard Earth land-cover labels.</p> |
| <p style="margin: 0;"><strong>4. Signal Attenuation & Cloud Masking:</strong> Heavy cloud cover blocks visual sensors completely. While SAR acts as a cloud-penetrating sensor, retrieving optical images from a cloudy query tile is physically restricted unless pre-processed cloud-masking layers are applied.</p> |
| </div> |
| </div> |
| </div> |
| </div> |
| </div> |
| </div> |
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| <div id="team-pane" class="tab-content" style="padding: 2.5rem;"> |
| <div class="card team-card" style="padding: 24px; background: #ffffff; border: 1px solid var(--border-color); border-radius: 8px;"> |
| <div class="team-hero" style="text-align: center; border-bottom: 1px solid var(--border-color); padding-bottom: 20px; margin-bottom: 30px;"> |
| <h2 style="font-family: var(--font-heading); font-size: 1.6rem; font-weight: 600; margin: 0; color: var(--primary-color);">Team 4MISTAKES</h2> |
| <p style="margin: 8px 0 0 0; font-size: 0.9rem; font-weight: 600; color: var(--text-secondary);">Rajiv Gandhi Institute of Petroleum Technology (An Institute of National Importance)</p> |
| </div> |
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| <div class="team-grid" style="display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem;"> |
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| <div class="member-card" style="position: relative; overflow: hidden; background: linear-gradient(145deg, #ffffff, #f8fafc); border-top: 4px solid #10b981; text-align: center; padding: 24px; border-radius: 8px; border-left: 1px solid var(--border-color); border-right: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); box-shadow: 0 4px 15px rgba(15, 23, 42, 0.03);"> |
| <div class="member-avatar" style="overflow: hidden; border-radius: 50%; width: 110px; height: 110px; margin: 0 auto 15px auto; border: 3px solid #10b981; box-shadow: 0 4px 12px rgba(16, 185, 129, 0.2);"> |
| <img src="/app_assets/ayush.jpg?v=4.0" alt="Ayush Pandey" style="width: 100%; height: 100%; object-fit: cover;"> |
| </div> |
| <h3 style="margin: 10px 0 4px 0; font-family: var(--font-heading); font-size: 1.2rem; font-weight: 600;">Ayush Pandey</h3> |
| <div class="member-role" style="font-weight: 700; color: #10b981; margin-bottom: 0.75rem; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.5px;">Deep Learning Developer & Team Lead</div> |
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| <ul style="list-style: none; padding: 0; margin: 15px 0; text-align: left; font-size: 0.75rem; line-height: 1.65; border-top: 1px solid var(--border-color); padding-top: 12px;"> |
| <li style="margin-bottom: 8px; display: flex; align-items: center; gap: 8px;"> |
| <span style="background: #fef3c7; color: #d97706; border: 1px solid #fde68a; border-radius: 4px; display: flex; align-items: center; justify-content: center; width: 22px; height: 22px; font-size: 0.7rem; flex-shrink: 0;"><i class="fa-solid fa-trophy"></i></span> |
| <span style="font-weight: 700; color: var(--text-primary);">Union Bank Ideathon Finalist</span> |
| </li> |
| <li style="margin-bottom: 8px; display: flex; align-items: center; gap: 8px;"> |
| <span style="background: #e0e7ff; color: #4f46e5; border: 1px solid #c7d2fe; border-radius: 4px; display: flex; align-items: center; justify-content: center; width: 22px; height: 22px; font-size: 0.7rem; flex-shrink: 0;"><i class="fa-solid fa-microscope"></i></span> |
| <span style="font-weight: 700; color: var(--text-primary);">Researcher @ QM Lab</span> |
| </li> |
| <li style="margin-bottom: 0; display: flex; align-items: center; gap: 8px;"> |
| <span style="background: #d1fae5; color: #059669; border: 1px solid #a7f3d0; border-radius: 4px; display: flex; align-items: center; justify-content: center; width: 22px; height: 22px; font-size: 0.7rem; flex-shrink: 0;"><i class="fa-solid fa-briefcase"></i></span> |
| <span style="font-weight: 700; color: var(--text-primary);">Intern @ Digitwin Tech</span> |
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| </ul> |
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| <div class="member-desc" style="font-size: 0.8rem; color: #64748b; line-height: 1.5; border-top: 1px solid var(--border-color); padding-top: 0.75rem; text-align: left; min-height: 80px; margin-bottom: 15px;"> |
| Developed the custom SAR adapter projection layers and supervised cross-sensor model training workflows. |
| </div> |
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| <div class="linkedin-container" style="margin-top: 12px; display: flex; align-items: center; justify-content: center; border-top: 1px solid var(--border-color); padding-top: 12px;"> |
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| <i class="fa-brands fa-linkedin"></i> LinkedIn Profile |
| </a> |
| </div> |
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| <img src="/app_assets/karan.jpg?v=4.0" alt="Karan Sharma" style="width: 100%; height: 100%; object-fit: cover;"> |
| </div> |
| <h3 style="margin: 10px 0 4px 0; font-family: var(--font-heading); font-size: 1.2rem; font-weight: 600;">Karan Sharma</h3> |
| <div class="member-role" style="font-weight: 700; color: #3b82f6; margin-bottom: 0.75rem; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.5px;">Backend & Systems Engineer</div> |
| |
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| <ul style="list-style: none; padding: 0; margin: 15px 0; text-align: left; font-size: 0.75rem; line-height: 1.65; border-top: 1px solid var(--border-color); padding-top: 12px;"> |
| <li style="margin-bottom: 8px; display: flex; align-items: center; gap: 8px;"> |
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| <span style="font-weight: 700; color: var(--text-primary);">SIH 2025 Winner (ISRO PS)</span> |
| </li> |
| <li style="margin-bottom: 8px; display: flex; align-items: center; gap: 8px;"> |
| <span style="background: #fef3c7; color: #d97706; border: 1px solid #fde68a; border-radius: 4px; display: flex; align-items: center; justify-content: center; width: 22px; height: 22px; font-size: 0.7rem; flex-shrink: 0;"><i class="fa-solid fa-trophy"></i></span> |
| <span style="font-weight: 700; color: var(--text-primary);">Union Bank Ideathon Finalist</span> |
| </li> |
| <li style="margin-bottom: 0; display: flex; align-items: center; gap: 8px;"> |
| <span style="background: #e0e7ff; color: #4f46e5; border: 1px solid #c7d2fe; border-radius: 4px; display: flex; align-items: center; justify-content: center; width: 22px; height: 22px; font-size: 0.7rem; flex-shrink: 0;"><i class="fa-solid fa-microscope"></i></span> |
| <span style="font-weight: 700; color: var(--text-primary);">Researcher @ QM Lab</span> |
| </li> |
| </ul> |
| |
| <div class="member-desc" style="font-size: 0.8rem; color: #64748b; line-height: 1.5; border-top: 1px solid var(--border-color); padding-top: 0.75rem; text-align: left; min-height: 80px; margin-bottom: 15px;"> |
| Designed the asynchronous FastAPI search API, configured the FAISS indexes, and implemented out-of-core image loading. |
| </div> |
| |
| <div class="linkedin-container" style="margin-top: 12px; display: flex; align-items: center; justify-content: center; border-top: 1px solid var(--border-color); padding-top: 12px;"> |
| <a href="https://www.linkedin.com/in/twynixkaran/" target="_blank" class="btn-linkedin" style="font-size: 0.85rem; color: #0a66c2; text-decoration: none; font-weight: 600; display: flex; align-items: center; gap: 4px;"> |
| <i class="fa-brands fa-linkedin"></i> LinkedIn Profile |
| </a> |
| </div> |
| </div> |
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| <div class="member-card" style="position: relative; overflow: hidden; background: linear-gradient(145deg, #ffffff, #f8fafc); border-top: 4px solid #6366f1; text-align: center; padding: 24px; border-radius: 8px; border-left: 1px solid var(--border-color); border-right: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); box-shadow: 0 4px 15px rgba(15, 23, 42, 0.03);"> |
| <div class="member-avatar" style="overflow: hidden; border-radius: 50%; width: 110px; height: 110px; margin: 0 auto 15px auto; border: 3px solid #6366f1; box-shadow: 0 4px 12px rgba(99, 102, 241, 0.2);"> |
| <img src="/app_assets/anurag.jpg?v=4.0" alt="Anurag Sharma" style="width: 100%; height: 100%; object-fit: cover;"> |
| </div> |
| <h3 style="margin: 10px 0 4px 0; font-family: var(--font-heading); font-size: 1.2rem; font-weight: 600;">Anurag Sharma</h3> |
| <div class="member-role" style="font-weight: 700; color: #6366f1; margin-bottom: 0.75rem; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.5px;">GIS & Search Algorithms Developer</div> |
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| <ul style="list-style: none; padding: 0; margin: 15px 0; text-align: left; font-size: 0.75rem; line-height: 1.65; border-top: 1px solid var(--border-color); padding-top: 12px;"> |
| <li style="margin-bottom: 8px; display: flex; align-items: center; gap: 8px;"> |
| <span style="background: #ffe4e6; color: #e11d48; border: 1px solid #fecdd3; border-radius: 4px; display: flex; align-items: center; justify-content: center; width: 22px; height: 22px; font-size: 0.7rem; flex-shrink: 0;"><i class="fa-solid fa-satellite-dish"></i></span> |
| <span style="font-weight: 700; color: var(--text-primary);">Intern @ RRSC-W NRSC ISRO</span> |
| </li> |
| <li style="margin-bottom: 8px; display: flex; align-items: center; gap: 8px;"> |
| <span style="background: #e0f2fe; color: #0284c7; border: 1px solid #bae6fd; border-radius: 4px; display: flex; align-items: center; justify-content: center; width: 22px; height: 22px; font-size: 0.7rem; flex-shrink: 0;"><i class="fa-solid fa-graduation-cap"></i></span> |
| <span style="font-weight: 700; color: var(--text-primary);">Intern @ Univ. of Southampton</span> |
| </li> |
| <li style="margin-bottom: 8px; display: flex; align-items: center; gap: 8px;"> |
| <span style="background: #f3e8ff; color: #7c3aed; border: 1px solid #e9d5ff; border-radius: 4px; display: flex; align-items: center; justify-content: center; width: 22px; height: 22px; font-size: 0.7rem; flex-shrink: 0;"><i class="fa-solid fa-school"></i></span> |
| <span style="font-weight: 700; color: var(--text-primary);">Ex-Intern @ IIT Ropar</span> |
| </li> |
| <li style="margin-bottom: 0; display: flex; align-items: center; gap: 8px;"> |
| <span style="background: #f1f5f9; color: #475569; border: 1px solid #e2e8f0; border-radius: 4px; display: flex; align-items: center; justify-content: center; width: 22px; height: 22px; font-size: 0.7rem; flex-shrink: 0;"><i class="fa-solid fa-pen-nib"></i></span> |
| <span style="font-weight: 700; color: var(--text-primary);">Reviewer: IEEE TGRS, NeurIPS</span> |
| </li> |
| </ul> |
| |
| <div class="member-desc" style="font-size: 0.8rem; color: #64748b; line-height: 1.5; border-top: 1px solid var(--border-color); padding-top: 0.75rem; text-align: left; min-height: 80px; margin-bottom: 15px;"> |
| Developed the Zero-Shot Modality Centering translation logic and built the Uber H3 geospatial search integration. |
| </div> |
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| <div class="linkedin-container" style="margin-top: 12px; display: flex; align-items: center; justify-content: center; border-top: 1px solid var(--border-color); padding-top: 12px;"> |
| <a href="https://www.linkedin.com/in/anurag-sharma-silver/" target="_blank" class="btn-linkedin" style="font-size: 0.85rem; color: #0a66c2; text-decoration: none; font-weight: 600; display: flex; align-items: center; gap: 4px;"> |
| <i class="fa-brands fa-linkedin"></i> LinkedIn Profile |
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