[GRASS-dev] Re: [GRASS GIS] #1452: wx location wizard doesn't ask for datum transform options because proj4 4.7.1's epsg file is broken (was: wingrass wx location wizard doesn't ask for datum transform options)

[GRASS GIS]

#1452: wx location wizard doesn't ask for datum transform options because proj4
4.7.1's epsg file is broken
-------------------------------------------+--------------------------------
 Reporter:  hamish                         |       Owner:  grass-dev@…              
     Type:  defect                         |      Status:  new                      
 Priority:  critical                       |   Milestone:  6.4.2                    
Component:  Projections/Datums             |     Version:  svn-releasebranch64      
 Keywords:  wingrass, location wizard, wx  |    Platform:  MSWindows XP             
      Cpu:  x86-32                         |  
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Comment(by hamish):

 * It seems that upstream epsg file is broken. (!)

 on Wingrass 6.4svn nightly build:

 in the projection wizard, proj=ll datum=nad27 does give the datum
 transform table menu

 in the projection wizard, proj=ll datum=nad83 does '''not''' give the
 datum transfotm menu.

 for one NAD83 datum found in the epsg file:
 {{{
 g.proj epsg=4152 datumtransform=-1
 }}}

 gives this error:
 {{{
 WARNING: Datum <NAD83_High_Accuracy_Regional_Network> not recognised by
         GRASS and no parameters found
 }}}

 however another datum=nad83 (epsg:4269) does show table.

 ?!


 at this point I went poking around and noticed that the $PROJ_LIB/epsg
 file on wingrass is '''missing''' a lot of datum= and instead had expanded
 +towgs84= terms. If datum= had remained you might be able to work around
 it, but that has not been preserved.


 locally I have proj 4.7.0 installed: epsg file is ok.

 wingrass ships proj 4.7.1: epsg file includes lots of +towgs84 terms that
 are not part of the formal epsg definition! they've just been irreversibly
 expanded on a random assumption.


 crap.


 fwiw proj 4.7.1 has not been formally released AFAIK (so why the @#$!!
 heck is osgeo4w shipping it??)


 Hamish

-- 
Ticket URL: <https://trac.osgeo.org/grass/ticket/1452#comment:3>
GRASS GIS <http://grass.osgeo.org>