Convert WKB/WKT geometries into GeoJSON-style format

g_export_to_json() exports input geometries to GeoJSON strings. Interface to OGR_G_ExportToJsonEx() in the GDAL API.

Usage

g_export_to_json(geom, srs = NULL, options = NULL)

Arguments

geom

Either a raw vector of WKB or list of raw vectors, or a character vector containing one or more WKT strings.

srs

Optional character string specifying the spatial reference system for the geometries given in geom. May be in WKT format or any of the formats supported by srs_to_wkt().

options

Optional character vector of NAME=VALE pairs. May include any of the options supported by OGR_G_ExportToJsonEx() in the GDAL API (see Details).

Value

A character vector of GeoJSON strings the same length as the number of input geometries.

Details

Available options are the ones supported by OGR_G_ExportToJsonEx(). See https://gdal.org/en/latest/api/vector_c_api.html.

If there is a SRS attached to the geometry, and the geometry is aimed at being stored in the "place" member of JSON-FG features, then COORDINATE_ORDER=AUTHORITY_COMPLIANT option must be set (added in GDAL 3.12.1). When a SRS is attached to the geometry, and AUTHORITY_COMPLIANT is used, the coordinates will be emitted in the order of the official SRS definition. When using TRADITIONAL_GIS_ORDER (the default), coordinates are emitted in longitude/easting first, then latitude/northing second. When no SRS is attached, coordinates are emitted in the order they are set in the geometry.

Examples

g_export_to_json("POINT (-114.0 47.0)")
#> [1] "{ \"type\": \"Point\", \"coordinates\": [ -114.0, 47.0 ] }"