[GRASS-dev] NAD projection issue

[Michael Barton]

Some of my students have been having intermittent, strange problems
reprojecting. They¹ve received errors that there are no projection
parameters. I sent in a report a couple months back but neither I nor others
have been able to replicate this in a consistent way.

I may have figured out what is happening. I think it¹s a problem with NAD
and Windows. I don¹t remember the reason, but there needs to be special
treatment of NAD projections at build time. I think it¹s because the
projection information is stored in a special file and not in the normal
PROJ data file. When I compile on my Mac, I need to ...

export NAD2BIN=/Library/Frameworks/PROJ.framework/Programs/nad2bin

...before compiling to make sure that I get proper information for NAD
projections.

In fact, it seems like it is necessary to call a linux/unix program to
handle NAD projections and that this may not be available in Windows. I
wonder if this is not happening with the native Windows build and causing
problems when the students use locations with NAD projections.

Does this make sense?

Michael
__________________________________________
Michael Barton, Professor of Anthropology
Director of Graduate Studies
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton


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