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I just updated core.create_location.py and the location wizard in GRASS 7 to go along with Paul's update to g.proj. Now the location wizard is creating correct locations for all available datums, when projections and datums are picked from a list.
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<div>So now the question is how to update GRASS 6.4.3 and 6.5</div>
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<div>The location wizard can simply be updated or backported to work like it does in GRASS 7 now.</div>
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<div>But core.create_location.py and g.proj will need to be updated first.</div>
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<div>create_location just has to work with g.proj -- though whatever happens, it will work a little differently than it did before with a risk of breaking any script that used it. I doubt there are many if any.</div>
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<div>compatibility of the updated g.proj to the old g.proj is probably the main issue, however. Here are the choices</div>
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<div>1. Don't updated anything because it may break someone's script. Consequences: the location wizard will create problem locations if projections and datums are picked from a list</div>
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<div>2. Update g.proj by adding a new argument "datum". Consequences: This will have no effect on any prior use of g.proj except for scripts that use "datum" as a shortcut to "datumtrans". g.proj for GRASS 6 will be a little different from g.proj for GRASS
7 (argument "datumtrans" in GRASS 6.4.3+ becomes "datum_trans" in GRASS 7). Location wizard can be fixed.</div>
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<div>3. Update g.proj to have the same arguments as now in GRASS 7: change "datumtrans" to "datum_trans" and add new "datum" argument. Consequences: Because "datumtrans" is an acceptable abbreviation for "datum_trans", this will not break scripts that use g.proj
unless they use the "datum" shortcut for "datumtrans". g.proj will have the same arguments in GRASS 6.4.3+ and GRASS 7. Location wizard can be fixed.</div>
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<div>My vote is for #3. It fixes the datum and location problem, is consistent across GRASS 6.4.3-GRASS 7 and does not break previous use of g.proj any more than #2.</div>
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<div>If all agree, then someone will need to backport Paul's fixes to g.proj to GRASS 6.5 and 6.4.3.</div>
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<div>Michael</div>
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<div>____________________</div>
<div>C. Michael Barton</div>
<div>Director, Center for Social Dynamics & Complexity </div>
<div>Professor of Anthropology, School of Human Evolution & Social Change</div>
<div>Arizona State University</div>
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voice: <span class="Apple-tab-span" style="white-space: pre; "> </span>480-965-6262 (SHESC), 480-727-9746 (CSDC)<br>
fax: 480-965-7671 (SHESC), 480-727-0709 (CSDC)<br>
<div>www: <a href="http://www.public.asu.edu/~cmbarton">http://www.public.asu.edu/~cmbarton</a>,
<a href="http://csdc.asu.edu">http://csdc.asu.edu</a></div>
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