What is GeoJSON and how to open it for field mapping
GeoJSON is a common open format for web maps and GIS data.
Field takeaways
- GeoJSON carries points, lines, polygons and attributes.
- RFC 7946 defines WGS84 coordinate use.
- KML is convenient for visual sharing; GeoJSON is strong for GIS/web.
- MapLab Survey can use GeoJSON in field workflows.
- CRS and coordinate order should be checked.
What GeoJSON is
A plain-text format that stores geometry together with its attributes. It opens in any text editor, which makes it easy to inspect and easy to fix.
It assumes WGS84
The specification expects longitude and latitude on WGS84, longitude first. That order is the opposite of how most people say coordinates aloud, and it is a frequent source of points landing in the wrong hemisphere.
Attributes travel with the geometry
Unlike DXF, GeoJSON keeps the field values attached to each feature, which is why it suits GIS handover.
Watch the file size
Being text, it grows quickly. Simplify or split large datasets before taking them into the field.
Try these steps on your own phone.
MapLab Survey handles RTK/GNSS point capture, drawing, area and volume calculations and coordinate conversion, then exports to DXF, KML/KMZ, GeoJSON, Shapefile, GeoPackage, NCZ or CSV. Capture, calculation and export work offline. Live NTRIP corrections and online basemaps need a connection.
Frequently asked questions
What is GeoJSON?
An open JSON-based geospatial format.
Can it open on a phone?
Yes, with MapLab Survey.
KML or GeoJSON?
KML for sharing, GeoJSON for GIS/web.
What CRS does GeoJSON use?
RFC 7946 defines WGS84 use.
Technical references
The field guidance in this article is aligned with the technical and official references below.
Related: GIS data collection · Point line polygon · Exporting field data to CAD/GIS · MapLab Survey