[GRASS-dev] updates to location wizard

[Michael Barton]

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.

So now the question is how to update GRASS 6.4.3 and 6.5

The location wizard can simply be updated or backported to work like it does in GRASS 7 now.

But core.create_location.py and g.proj will need to be updated first.

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.

compatibility of the updated g.proj to the old g.proj is probably the main issue, however. Here are the choices

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

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.

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.

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.

If all agree, then someone will need to backport Paul's fixes to g.proj to GRASS 6.5 and 6.4.3.

Michael
____________________
C. Michael Barton
Director, Center for Social Dynamics & Complexity
Professor of Anthropology, School of Human Evolution & Social Change
Arizona State University

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