Hi,
If you select a scr from a geographic coordinate sys (like wgs84) too a
projected sys like utm, you should have the square back. You will need to
figure in what zone you are.
Nicolas Cadieux M.Sc.
Les Entreprises Archéotec inc. 
8548, rue Saint-Denis Montréal H2P 2H2
Téléphone: 514.381.5112  Fax: 514.381.4995
www.archeotec.ca
On Jun 27, 2015 12:27 PM, "Christer Andersson [via OSGeo.org] "
<[email protected]> wrote:
Hi,
How to
solve this problem?
1. I
measure a square on the ground.
2. I take
latitude and longitude of all four corners with a precision-GPS.
3. I have
succeded in making a map where the four corners are marked and the coordinates
are along the sides of the A4-paper.
4. The
problem is that the square has been transformed to a rectangle because of the
latitude shortening.
Is there a
solution to multiplay only the longitude by 1/cos(latitude) to get back the
square?
(I
understand that 1/cos(latitude) is only valid for a sphere (not spheroid) but I
do not know a
better formula. The latitude is 60 deg.)
Regards
Christer
Sweden
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