Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I have a project and a topomap in WGS84 (EPSG4326). On the fly CRS transformation is activated. I open Google satellite layer from the OpenLayers plugin. The Google layer is WGS84 / Pseudo Mercator (EPSG3857). But then the whole project has also become WGS84 / Pseudo Mercator (EPSG3857).

I thought on the fly transformation would reproject to EPSG4326. Why is that? Is it better to work directly in WGS84 / Pseudo Mercator (EPSG3857) systematically when we use Google Earth?

share|improve this question

The Openlayers plugin fetches tiles from Google or Openstreetmap servers which come in EPSG:3857. If you would reproject them to another CRS tile by tile, the result would look rather ugly. That's why the developer decided to insist on the project CRS bound to EPSG:3857, so that every other data gets reprojected, but not the tiles. And that is the same the original Openlayers works.

A solution would be to download all relevant tiles, stitch them together, reproject and display the result. But that would take too much time.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

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