[Proj] How to derive projections definitions from North American LCC and Polar Stereographic rendered maps rasters?

stephane.poirier at usherbrooke.ca stephane.poirier at usherbrooke.ca
Wed Jun 3 00:38:06 EST 2009

Hi All,

1) Is there a way to derive projection parameters strictly from the rendered raster information of 
http://pages.usherbrooke.ca/spoirier/ouranos_dai_crcm_polar-stereographic(milka).png and
assuming accuracy is not so critical?

2) Would this, here below, be a close enough proj4js definition for the polar stereographic here above?
Proj4js.defs["EPSG:CRCM"] = "+proj=stere +lat_0=90 +lat_ts=60 +lon_0=-97 +k=1 +x_0=3450000 +y_0=7450000 +ellps=WGS84 +datum=WGS84 +units=m" (CRCM being our own custom EPSG string tag).


Stephane Poirier, M.Sc. Optics Physics
Remote Sensing Research Professional
University of Sherbrooke, QC, Canada
Stephane.Poirier at USherbrooke.ca
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