Singapore Land Authority (SLA) maintains national map polygon features covering coastlines, recreational areas, and hydrographic elements across Singapore. GEOJSON and KML datasets share the National Map Polygon layer for basemap and GIS integration. Surveyors, emergency planners, and developers building location services can reuse authoritative SLA geometry. This collection anchors Singapore national map polygon open data on the government catalogue.
This dataset contains polygon features of national map data which includes coastal outlines, recreational and hydrographic features.
Singapore Land Authority GeoJSON national map polygon features including coastal outlines, recreational areas, and hydrographic polygons, with coverage from June 2025. Cartographers and GIS developers use the layer as base geometry for Singapore mapping, coastal, and recreation spatial analysis.