3

I'm working with QGIS and satellite view projections, in order to achieve something similar to the maps created by Richard Edes Harrison for Fortune magazine in the '40s (reference). I have a question regarding +proj=geos. I'm working with QGIS 3.8.2.

  • Is it possible to have a geos projection not centered on the Equator? Theese parameters (+proj=geos +h=30000000.0 +lon_0=70 +sweep=y) generates this map:

enter image description here

I would like to tilt the view towards the North Pole, so that Russia (outlined in red) would be more visible and centered on the view.

1

I can only answer the first question about the GEOS projection.

The GEOS projection displays the earth as a geostationary satellite would see it (this is where its name comes from). Geostationary satellites orbit the Earth with an orbital period that is the same as the Earth's rotational period. To be able to do that, they are placed directly above the equator (allocated at different longitudes, see here) at an altitude close to 36,000 km. That is the underlying reason why latitude is not included as a GEOS projection parameters. Hence to answer your question, no you cannot have a GEOS projection that is not centered on the equator.

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.