Hello I want to create an overlay for google maps. As far as I know google maps using Spherical Mercator, so the system where I read the maps use Mercator but is not specified which (spherical or cylinder) type it use.

When i create the images, i get some information in common. That means I have an offset. I want to try to solve this using cylinder mercator coordinates, but i don't know how can i transform google coordinates to Cylinder Mercator coordinates.

Thank you in advance.


I suppose you mean Spherical vs Elliposidal Mercator. Google use real WGS84 coordinates and map them as if they were on a sphere rather then an ellipsoidal datum. It depend on the coordinates of your original images how to reproject them on Spherical Mercator projection. You can user gdal_transform or whatelse GIS tool to do the transformation. The target CRS is EPSG:3857 (or the legacy, not standard, EPSG:900913).

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.