TopoJSON driver

(Note: prior to GDAL 2.3, the functionality of this driver was available in the GeoJSON driver. They are now distinct drivers)

Starting with OGR 1.11, the driver can read the TopoJSON format

Datasource

The driver accepts three types of sources of data:

Uniform Resource Locator (URL) - a Web address to perform HTTP request.
Plain text file with TopoJSON data - identified from the file extension .json or .topojson
Text passed directly and encoded in Topo JSON

Starting with GDAL 2.3, the URL/filename/text might be prefixed with TopoJSON: to avoid any ambiguity with other drivers.