Place three or more boundary vertices to measure the area.
CSV rows need lat and lon columns. They are added as vertices in Boundary mode and as points otherwise. Polygons in GeoJSON, KML and GPX replace the boundary.
Boundary vertices 0
Sampling points 0
On an iPhone, open this page in Safari, tap Share, then Add to Home Screen. On Android, use Install app in the Chrome menu if the button above does not appear.
GeoJSON and KML open directly in QGIS, ArcGIS and Google Earth. Keep the outline file beside your study area file to build a location map.
Every coordinate is WGS 84. Areas and distances use the WGS 84 ellipsoid with a local correction, which is suitable for planning and reporting. For legal or cadastral work, use a surveyed value. Field data recorded on the Minna datum must be converted before it is typed in or imported.
Plotted data is saved in this browser only. Map tiles and outlines need an internet connection.