FlatGeobuf

Placemark supports the relatively-new FlatGeobuf format for both importing & exporting features. FlatGeobuf supports roughly the same features as GeoJSON, but in contrast to GeoJSON's text encoding, FlatGeobuf is a binary file format that's made to be small and efficient.

• The default file extension for FlatGeobuf is fgb.
• FlatGeobuf doesn't support complex properties like arrays or objects. Exporting to FlatGeobuf will turn these properties into strings.

Technical details

Placemark uses the FlatGeobuf reference implementation JavaScript module to import & export its format.