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license: mit
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# 🪨 Dataset Description: `segments_with_geochem.csv`

## 🧾 Overview
This dataset is a **merged collection** linking **image segments of drill core trays** with their corresponding **lithological and geochemical information**.  
Each row represents one image segment (a small interval of core depth) combined with a specific geochemical measurement.

It contains **17,992 rows** and **31 columns**, integrating three main data sources:
1. **Segmented core images** generated from hyperspectral core tray processing.  
2. **Lithology intervals** from SARIG drillhole logging data.  
3. **Geochemical assay data** matched by drillhole and depth range.

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## 🧱 Structure and Key Columns

| Category | Example Columns | Description |
|-----------|------------------|--------------|
| **Image Segment Metadata** | `filename`, `drillhole_number`, `core`, `segment`, `depth_m` | Derived from processed images (e.g. `9955_5_9_9.15.jpg`). Each represents a core segment at a specific depth within a drillhole. |
| **Lithology Data (SARIG)** | `LOG_NUMBER`, `LOGGING_ORGANISATION`, `QUALIFICATION`, `LOGGING_DATE`, `major_lithology`, `DESCRIPTION` | Imported from SARIG drillhole lithology logs. These describe rock type, logging geologist, and confidence of lithological interpretation. |
| **Spatial Coordinates** | `EASTING_GDA2020`, `NORTHING_GDA2020`, `LONGITUDE_GDA2020`, `LATITUDE_GDA2020`, `ZONE_GDA2020` | Georeferencing information for each drillhole site. |
| **Geochemistry Data** | `chem_code`, `value`, `unit`, `chem_method_code`, `chem_method_desc` | Chemical element concentrations and assay method details. For example, `chem_code = 'Cu'`, `value = 85`, `unit = 'ppm'`, `chem_method_code = 'IC4M'`. |
| **Depth Range (Lithology/Assay)** | `depth_from_m`, `depth_to_m` | Defines the downhole interval associated with the lithology or geochemical measurement. |

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## 🧬 How It Was Made

### 1. Core Segmentation
Core tray images were processed into **individual core segments** using depth data.  
Each segment was saved as an image file named using this pattern:
[drillhole_number]\_[core_number]\_[segment_number]\_[depth_m].jpg

Example: `9955_5_9_9.15.jpg` → Drillhole 9955, Core 5, Segment 9, Depth 9.15 m.

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### 2. Lithology Mapping
Each image segment was matched to **SARIG lithology logs** (`sarig_dh_litho_exp.csv`), using:
drillhole_number matches AND
depth_from_m <= segment_depth <= depth_to_m

This allowed each segment to inherit lithological attributes such as `major_lithology` and `DESCRIPTION`.

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### 3. Geochemical Integration
The merged segment–lithology dataset was further joined with **SARIG assay data**.  
Matching was again done by `drillhole_number` and depth overlap.  
Each segment now includes one or more geochemical assay results (e.g., Cu, Fe, Au) with their `chem_method_code` and measurement units (commonly `ppm`).

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## 📊 Purpose and Use
This dataset is designed for **data integration and machine learning** applications that connect visual and chemical rock properties.  
It can be used for:
- Linking **visual mineralogical features** in core images to **geochemical compositions**.  
- Building **ML models** to predict chemistry or lithology from imagery.  
- Performing **cross-domain correlation** between **NVCL hyperspectral data** and **laboratory assays**.

Each record connects what’s *seen* in the rock (image/lithology) to what’s *measured* in the lab (chemistry).

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## 🧪 Notes
- The **`value`** column represents assay readings, often in **ppm (parts per million)**.  
- The **`unit`** column confirms the measurement type (e.g., `ppm`, `%`, etc.).  
- The dataset integrates spatial, spectral, and chemical data — making it suitable for **multi-modal mineral systems analysis**.