1️⃣ Upload your map
Click “Select PDF”.
2️⃣ Georeference
Toggle Georeference Mode, click points on the map, and enter lon/lat.
3️⃣ Compute transform
Choose affine or polynomial, then click Compute Transform.
4️⃣ Extract water
Click Extract Water to detect water bodies inside the map area.
5️⃣ Export
Export water polygons as GeoJSON for GIS tools.