[Qgis-user] meter-scale

[Christer Andersson]

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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