Overview

We are adding an new option to the data Export endpoint which allow you to specify the projection to be used for Geometry data by providing the Proj4 string to use to convert over from WGS84 (Lat-Long)

Who does this affect?

This change will affect API users of the Export endpoint but will not modify the existing behaviour if the optional setting is not provided. 

Details

The following endpoint:

POST /api/export 

now accepts an optional string proj4 that may be used to convert geometry coordinates into the spatial reference system of your choice. This mirrors the optional Proj4 setting used during import.

Without the proj4 string, geometry is exported in WGS84 (Longitude, Latitude) coordinates.

There is a database of PROJ4 strings available for searching here https://epsg.io/

For example, for the UK British National Grid system, the Proj4 string is

+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +ellps=airy +datum=OSGB36 +units=m +no_defs

Expected Release Date

13th January 2022