GIS Tools
GIS Coordinate & GeoJSON Tools
WGS84 geographic/UTM conversion and geodesic GeoJSON area/perimeter measurement. Coordinate conversion uses Proj4js; GeoJSON measurement uses Turf.js.
Latitude/longitude → UTM
UTM → latitude/longitude
GeoJSON polygon area and perimeter
Upload a GeoJSON file containing Polygon or MultiPolygon features. Coordinates must be longitude, latitude in WGS84 (EPSG:4326) order; projected coordinates are not automatically reprojected.
Area and perimeter are geodesic approximations provided by Turf.js. Check geometry validity and coordinate order before using results in reports.