Hello all,I have a quick question regarding the datum assumption when entering lon/lat data into a Basemap object.
My understanding is that Basemap will use the datum specified upon creation, the default being a sphere of radius 6,370,997 meters and assume that the lon, lat entered in a call follows the same convention. Then, if you have lon lat which uses a different datum to the projection of the basemap you must convert this to lon/lat in the correct datum *before* then converting to projection coordinates using the basemap object. Is that correct?
Assuming my understanding above is correct, I don't feel that this process is made clear in the documentation for basemap and I'm sure many make the mistake of thinking of lon/lat as an absolute across all geodetic standards. I know ignorance is not an excuse, but it might be nice if people got a more explicit warning to take care with their inputs.
For reference, I found this blog which describes the datum mistake nicely: http://ragrawal.wordpress.com/2009/01/24/a-point-about-latitudelongitude Kindest regards, Mat -- Dr. Mathew Topper Institute for Energy Systems School of Engineering The University of Edinburgh Faraday Building The King's Buildings Edinburgh EH9 3JL Tel: +44 (0)131 650 5570 School fax: +44 (0)131 650 6554 mathew.top...@ed.ac.uk <mailto:mathew.top...@ed.ac.uk> http://www.see.ed.ac.uk <http://www.see.ed.ac.uk/>
The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.
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