[GRASS-dev] [GRASS GIS] #1967: wxPy loc'n wiz: doesn't allow ellipsoid without datum

[GRASS GIS]

#1967: wxPy loc'n wiz: doesn't allow ellipsoid without datum
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 Reporter:  hamish                      |       Owner:  grass-dev@…              
     Type:  defect                      |      Status:  new                      
 Priority:  critical                    |   Milestone:  6.4.3                    
Component:  wxGUI                       |     Version:  svn-releasebranch64      
 Keywords:  location wizard, ellipsoid  |    Platform:  All                      
      Cpu:  All                         |  
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 Hi,

 the location wizard won't like you create a location unless you set a
 datum.

 example: start grass with the wxGUI, click on loc'n wizard, click on
 Select coord sys params from list, proj code: ll, "Select datum or
 ellipsoid (next page)" -> '''Ellipsoid only''', ellipsoid code: sphere,

 {{{
 WARNING: Datum <unknown> not recognised by GRASS and no parameters found
 ERROR: Invalid datum code <>
 }}}

 the warning may be harmless (expected), but the ERROR is probably the loc
 wiz passing the datum= option unconditionally, which we can easily fix.


 adding a G_debug() statement in there shows:
 {{{
 D0/0: proj4string=[+proj=longlat  +lat_0=0.0 +lon_0=0.0 +ellps=sphere
 +a=6370997.000  +e=0.0 +no_defs +no_defs]
 }}}

 (I don't think related, but again note the two '+no_defs')

 Once you click ok to the warning pop-up it goes away and takes you to the
 Summary page, but the PROJ.4 definition is blank, and so it won't let you
 finish.

 this is somewhat related to #1849 (r56093, r56143), and most likely the
 real trouble earlier noticed in #1513/comment 3, but in the latter case I
 mistook the cause for being specific to the new Planetary ellipsoid
 selection tool.

 It is unclear to me if proj 4.8.0 will automatically try to fill in datum
 details if you left it blank, but I get the same breakage w/ 4.7.0 and
 4.8.0 proj4s.


 thanks for the diagnosis Yann.


 using the text startup and g.setproj all should be ok.


 Hamish

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Ticket URL: <https://trac.osgeo.org/grass/ticket/1967>
GRASS GIS <http://grass.osgeo.org>