[GRASS-dev] Re: [GRASS GIS] #577: v.in.ogr: imported GPX file results in N=0, W=0

[GRASS GIS]

#577: v.in.ogr: imported GPX file results in N=0, W=0
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  Reporter:  hamish  |       Owner:  grass-dev at lists.osgeo.org
      Type:  defect  |      Status:  new                      
  Priority:  normal  |   Milestone:  6.4.0                    
 Component:  Vector  |     Version:  svn-develbranch6         
Resolution:          |    Keywords:  v.in.ogr, gpx            
  Platform:  Linux   |         Cpu:  x86-32                   
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Comment (by mmetz):

 Replying to [comment:4 hamish]:
 > Replying to [comment:3 mmetz]:
 > > Hamish, can you do a bit more testing? Are the extends still wrong
 > >   * after rebuilding topology with v.build?
 >
 > yes
 >
 > hmmm.... nodes 1 & 2:
 >
 > {{{
 > G65> v.build gps_trk_gpx_import option=dump
 > ---------- TOPOLOGY DUMP ----------
 > N,S,E,W,T,B: 0.000000, -46.055889, 170.724047, 0.000000, 0.000000,
 0.000000
 > Nodes (3838 nodes, alive + dead ):
 > node = 1, n_lines = 1, xy = 0.000000, 0.000000
 >   line =   1, type = 2, angle = -9.000000
 > node = 2, n_lines = 1, xy = 0.000000, 0.000000
 >   line =  -1, type = 2, angle = -9.000000
 > ...
 > }}}
 >
 There must be one point each at these two nodes because n_lines = 1, angle
 = -9.000000 (point or degenerate line/boundary). If there is really no
 point with x = 0 y = 0 int he vector this looks very much like a bug in
 the vector libs.


 > maybe someone importing many similar maps expects layer 4 to always to
 be the same regardless of if layer 3 for one of the maps has values or
 not?

 OK, forget about skipping empty layers, that would have been a workaround
 only anyway.

 Markus M

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Ticket URL: <https://trac.osgeo.org/grass/ticket/577#comment:6>
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