calibration IGN Map (1/25000)

Questions and problems regarding map calibration and conversion.

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Posts: 3
Joined: Fri Aug 26, 2005 2:53 pm

calibration IGN Map (1/25000)

Postby bruno » Wed May 28, 2008 3:00 pm

I'm trying to calibrate a IGN (1/25000 )map, I am having difficulty understanding what to put in the projection parameters section of the map converter. The projection of the map is Lambert 2 etendu /NTF . I don't know witch projection (Lambert conformal conic, lat/long(Geodetic), Transvers Mercator ,ou Universal Transverse Mercator ) and parameters ( lon_0,lat_0,lat_1,lat_2,x_0,y_0 ) must I write for calibration ...

Any help would be apreciated.

Thanks, Bruno .

Posts: 3
Joined: Fri Aug 26, 2005 2:53 pm

calibrating IGN Map

Postby bruno » Mon Jun 02, 2008 6:53 pm

I have foud the good parameters for french IGN ( 1/25000 ) map . use lambert conic conformal and the following value :
Lat_0 : N46.8
lat_1: N45.8989189
Lat_2: N45.6960144
For map wtih about 7km of diagonal ,the error of position on my Palm is less than 2 m ! great ! :D

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