New version of our Web GIS (NextGIS Web, nextgis.com) is able to calculate areas and length in a custom spatial reference system right on your Web maps.
Thanks to latest changes you now can:
This new functionality adds to already existing tools that use custom SRS. Our Web GIS can:
SRS definintions can be imported from Proj, Mapinfo, ESRI WKT and as EPSG code.
Read more about what you can do with custom SRS. Create your Web GIS to get started.