Add files using upload-large-folder tool

README.md

@@ -0,0 +1,76 @@
+# CTC
+
+CTC is a geospatial remote-sensing benchmark with paired raster tiles, labels, split files, tile extents, and source map vector data.
+
+## Dataset Structure
+
+```text
+CTC/
+  rgb/                  RGB image tiles
+  cir/                  Color-infrared image tiles
+  basemap/              Basemap image tiles
+  dsm/                  Digital surface model tiles
+  lc/                   Land-cover tiles
+  labels/               Public annotation files for train and validation samples
+  splits/               Train, validation, test, and benchmark split files
+  benchmark/            Benchmark RGB and CIR image tiles
+  gpkg/                 Source map vector data as GeoPackage
+  extent.csv            Per-tile geospatial bounding boxes
+```
+
+## Contents
+
+- `rgb`, `cir`, `basemap`, `dsm`, and `lc` each contain 14,499 image tiles.
+- `labels` contains 12,427 public annotation files.
+- `splits/train.txt` contains 9,651 samples.
+- `splits/val.txt` contains 2,070 samples.
+- `splits/test.txt` contains 2,072 samples.
+- `splits/benchmark.txt` contains 200 benchmark samples.
+- `splits/benchmark_low-light.txt` and `splits/benchmark_weather.txt` each contain 100 benchmark samples.
+- `benchmark/rgb` and `benchmark/cir` each contain 200 benchmark image tiles.
+- `gpkg/top10nl_Compleet.gpkg` contains 31 vector layers in EPSG:28992.
+
+## File Naming
+
+Each split file stores sample stems without file extensions. For a sample stem such as:
+
+```text
+airport_group_001_feature_10873_x1_y0
+```
+
+the corresponding raster and label paths are:
+
+```text
+rgb/airport_group_001_feature_10873_x1_y0.png
+cir/airport_group_001_feature_10873_x1_y0.png
+basemap/airport_group_001_feature_10873_x1_y0.png
+dsm/airport_group_001_feature_10873_x1_y0.png
+lc/airport_group_001_feature_10873_x1_y0.png
+labels/airport_group_001_feature_10873_x1_y0.txt
+```
+
+For test samples, the image products are present but label files are not included.
+
+## Test Labels
+
+This release withholds labels for the samples listed in `splits/test.txt`. The corresponding label files are intentionally excluded from `labels/` to support benchmark-style evaluation.
+
+## Tile Extents and Vector Features
+
+`extent.csv` provides the geospatial extent of each tile:
+
+```text
+id,xmin,ymin,xmax,ymax,crs
+airport_group_001_feature_311_x1_y3,176005.706999999,407660.699000001,176261.706999999,407916.699000001,EPSG:28992
+```
+
+Use the `id` column to match a tile stem from the raster folders or split files. The `xmin`, `ymin`, `xmax`, and `ymax` columns define the tile bounding box in the coordinate reference system given by `crs`.
+
+The corresponding map vector features can be retrieved directly from `gpkg/top10nl_Compleet.gpkg` by querying layers with the tile bounding box from `extent.csv`. The GeoPackage layers use EPSG:28992 and include point, line, polygon, and multipolygon TOP10NL feature layers such as buildings, roads, water, terrain, rail, relief, places, and functional areas.
+
+Typical workflow:
+
+1. Read a sample stem from `splits/train.txt`, `splits/val.txt`, `splits/test.txt`, or `splits/benchmark.txt`.
+2. Look up the same stem in `extent.csv` to get the patch extent.
+3. Use that extent as a bounding box query against `gpkg/top10nl_Compleet.gpkg`.
+4. Use the returned vector features together with the raster tile products for geospatial analysis or model training.