[GRASS5] datum shifts

[Glynn Clements]

rgrmill at rt66.com wrote:

> The nad27<->nad83 conversions are based on data tables.  The data tables 
> are shipped in ascii form.  They have to be interpreted to binary by a 
> program that ships with the package and then placed somewhere in the 
> $GRASSBASE hierarchy.  Currently I have them in $GRASSBASE/etc/nad.  It 
> would make more sense to me to put them in $GRASSBASE/lib/nad.  Your 
> input would be appreciated.

$GISBASE/etc is probably more correct. Presently, $GISBASE/lib only
contains libraries; all data tables are under $GISBASE/etc.

> The user modules must know where the data tables are stored, and that 
> information should be compiled into the modules.  I think that would be 
> done by configure, but I don't know enough to say, much less enough to 
> make the change myself.

With one exception[1], everything uses $GISBASE to determine
pathnames. That should be the case for the data tables, if at all
possible.

[1] The locale message catalogues don't, but I'll fix that now that
I've been reminded of it.

-- 
Glynn Clements <glynn.clements at virgin.net>