[GRASS-dev] Re: [GRASS GIS] #495: v.out.ascii: layer=2 column output wrong

[GRASS GIS]

#495: v.out.ascii: layer=2 column output wrong
-----------------------+----------------------------------------------------
  Reporter:  hamish    |       Owner:  grass-dev at lists.osgeo.org
      Type:  defect    |      Status:  new                      
  Priority:  critical  |   Milestone:  6.4.0                    
 Component:  Vector    |     Version:  6.4.0 RCs                
Resolution:            |    Keywords:  v.out.ascii, layer       
  Platform:  Linux     |         Cpu:  x86-32                   
-----------------------+----------------------------------------------------
Changes (by hamish):

  * priority:  major => critical
  * summary:  v.out.ascii: warning message when layer=2 => v.out.ascii:
              layer=2 column output wrong

Comment:

 Ah, I (think I) see what the warning means,

 {{{
 v.out.ascii tmp_point_9669 layer=2 column=width  2> /dev/null | head
 608119|4915294|1|594.62231400
 608079.22533499|4915385.61470284|1|594.62231400
 608039.45066998|4915477.22940567|1|594.62231400
 607999.67600497|4915568.84410851|1|594.62231400
 607959.90133996|4915660.45881135|1|594.62231400
 607920.12667495|4915752.07351418|1|594.62231400
 607880.35200994|4915843.68821702|1|594.62231400
 607840.57734493|4915935.30291985|1|594.62231400
 607800.80267992|4916026.91762269|1|594.62231400
 607761.02801492|4916118.53232553|1|594.62231400
 }}}


 it means that it is mixing up cats from layer=1 and layer=2.

 layer=1 cat is always 1 in this map (orig cat of v.to.points input line)
 and so it retrieves the layer=2 cat=1 value (594.622) for all points :(
 instead of by layer 2 cats:

 {{{
 v.db.select tmp_point_9669 layer=2 | head
 cat|lcat|along|width
 1|1|0|594.622314
 2|1|99.876312|550.689599
 3|1|199.752625|460.65393
 4|1|299.628937|410.969189
 5|1|399.505249|454.671559
 6|1|499.381561|457.451076
 7|1|599.257874|472.407835
 8|1|699.134186|562.410718
 9|1|799.010498|597.98247
 }}}


 changing title of bug & increasing severity.


 Hamish

-- 
Ticket URL: <https://trac.osgeo.org/grass/ticket/495#comment:1>
GRASS GIS <http://grass.osgeo.org>