[Gdal-dev] gdal_translate and projection help

[Brent Fraser]

Steve,

  You'l l need a few more parameters, like:

proj=lcc
ellps=clrk80
lat_0=0n
lon_0= ???e
lat_1=??n
lat_2=??n
x_0=0
y_0=0

It will likely take some detective work to determine the
values.  Be careful of the longitudes on the map, they may
be relative to Greenwich or the Paris meridian.  And if you
are going to integrate other data, don't forget to figure
out the datum.

Brent Fraser
GeoAnalytic Inc.
Calgary, Alberta

----- Original Message ----- 
From: "Stephen Woodbridge" <woodbri at swoodbridge.com>
To: <gdal-dev at lists.maptools.org>
Sent: Wednesday, February 07, 2007 9:01 PM
Subject: [Gdal-dev] gdal_translate and projection help


> Hi,
>
> I need help with setting the projection -a_srs for
gdal_translate. I'm
> trying to goereference a 100k topo map and the collar only
says it is a
> Lambert projection and Clarke ellipsoid. It is
ulx=35.433333, uly=34.75,
> lrx=36.0, lry=34.25. The map is circa 1970 of Lebanon and
the collar is
> in French if that helps.
>
> I looked through the Proj.4 EPSG file but didn't find any
likely
> candidate. Their were some similar to my area are
EPSG:3200 and
> EPSG:24600 if the lon_0 were tweaked to be closer.
>
> Any ideas on what to do here?
> Is it as simple as -a_srs 'proj=lcc ellps=clrk80'
>
> Unfortunately, if it unlikely that I can get more
information about the
> topo image.
>
> -Steve
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