Dear Gergő,
you can create custom CRS, use Settings -> Custom CRS from the menu.
You must know the definition of the projection in Proj.4 format.
See:
https://www.qgis.org/en/docs/user_manual/working_with_projections/working_with_projections.html#sec-custom-projections
http://gis.stackexchange.com/questions/20566/how-to-define-new-custom-projections-in-qgis
If you mean planet Mars, then you must define a datum too. AFAIK QGIS
database contains datums for the Earth only.
Regards,
Zoltan
On Sun, 19 Jan 2014, Gergő Kovács wrote:
Hy,
I would like to ask a question.
How can I import and use an external CRS? I want to use a martian
("Mars2000") CRS for my thesis.
I would appreciate if somebody could help me.
Thanks!
Gergő Kovács
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