[Qgis-user] meter-scale

[Nicolas Cadieux]

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]	" <ml-node+s1560n5213234h15 at n6.nabble.com> 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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