Draw one polygon and export GeoJSON

The route reflects a common search phrase, but the interactive canvas is MapLibre, not the Google Maps drawing library.

• The basemap uses the site's configured map resources
• The generated file is standard GeoJSON
• Using the output in another platform is a separate integration step

Click the map to add vertices. With at least three vertices, Close polygon appends the first coordinate to the end of the ring and stops accepting more clicks.

• Before closing, two or more vertices preview as a LineString
• After closing, the preview becomes one Polygon
• Reset clears every vertex and starts a new draft

The tool does not drag or delete individual vertices, undo the last click, reopen a closed ring, attach properties, or create multiple polygons.

• Zoom and position the map before precise clicks
• Reset and redraw when a vertex is wrong
• Use the full editor when the project needs multiple editable shapes or styling

After the polygon is closed, the download contains one FeatureCollection with one Polygon and an empty properties object.

• Coordinates are written as longitude then latitude
• No KML, GPX, CSV, image, or embed output is generated
• The file is not automatically imported into MapsMaker

Vertices are held in browser component state and disappear on refresh. Clicking a visual basemap does not make a cadastral, legal, or survey-accurate boundary.

• Download before leaving the page
• Check the GeoJSON against an authoritative source when accuracy matters
• Use the polygon checker for a basic preview, not full topology validation