Awesome
projestions
Map projection suggestions. projestions = projections + suggestions. Demo.
Provides a simple API for finding map projections appropriate for a particular area.
Data
The results of the API based on the EPSG's CRS data (v9.4) and its "area of use" data (v9.2.1). Both datasets are available to download on the EPSG site. You might be interested in their terms of use.
Prior art
Similar things have been done before:
- epsg.io has an API
- epsg-registry.org has a way to search by bounding box
- ...and others, I'm sure.
API
Check out the demo to see it in action.
Endpoint
GET or POST to https://projest.io/ns/api/
Parameters
| name | value | description |
|---|---|---|
| geom | GeoJSON feature or feature collection | (required) the feature(s) you want to find an appropriate projection for |
| geojson | boolean | (optional) true to return GeoJSON of areas of use, else JSON is returned, default false |
| max | number | (optional) maximum number of results to return, default 20 |
| offset | number | (optional) number of results to skip, default 0 |
| sort | string | (optional) how to sort results, hausdorff to sort by the Hausdorff distance or area to sort by the area of use's area, areadiff to sort by the absolute difference between the geometry in geojson and the area of use, default areadiff. |
| units | string | (optional) projection units to return, default all |
Returns
An array of projections with areas of use overlapping with the given geom. If geojson is true, returns GeoJSON of the polygons of the areas of use.
License
GPLv3. See LICENSE.txt.