[GRASS-dev] [GRASS GIS] #2903: v.edit break bug with multiple coordinates

[GRASS GIS]

#2903: v.edit break bug with multiple coordinates
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  Reporter:  robert17  |      Owner:  grass-dev@…
      Type:  defect    |     Status:  new
  Priority:  normal    |  Milestone:  7.0.7
 Component:  Vector    |    Version:  7.0.3
Resolution:            |   Keywords:
       CPU:  OSX/PPC   |   Platform:  All
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Comment (by jradinger):

 It seems that this issue is not yet solved?!

 I just had similar problems using `v.edit tool=break`. Tested with version
 7.4.1 (r72807M) and 7.5SVN (r73007M) and MacOS. Trying to break a line
 vector map at multiple coordinates using `v.edit` causes that some of the
 line features might not get broken (I don't know why). Then I can run
 `v.edit tool=break` a second time which causes an overlay of the old line
 feature with the two broken parts (so in sum three lines, that can be
 identified using the gui query tool). This happens not for all
 lines/coordinates; however I couldn't identify a common pattern that might
 cause these errors.

 Here an example with the NC dataset were I can at least reproduce the
 error of getting mulitple overlayed lines when using the break tool (have
 a look at the railroad line feature with the orig cat 3231):
 {{{
 from grass.script import core as grass

 # Copy data from PERMANENT mapset
 grass.run_command("g.copy",
     overwrite=True,
     vector="railroads at PERMANENT,railroads")
 grass.run_command("v.extract",
     overwrite=True,
     input="firestations at PERMANENT",
     cat="58,66,29,35,31,32",
     output="firestations")

 # Connectors to find exact break points coords
 grass.run_command("v.distance",
     overwrite=True,
     to="railroads",
     from_="firestations",
     output="firestations_connectors")
 firestations_connectors_coors = grass.read_command("v.to.db",
     flags="p",
     map="firestations_connectors",
     option="end",
     separator="comma").splitlines()
 firestations_connectors_coors = [[",".join(x.split(",")[1:3])] for x in
 firestations_connectors_coors[1:]]

 # Break at point coords
 grass.run_command("v.edit",
       tool="break",
       map="railroads",
       coords=firestations_connectors_coors,
       threshold=50,
       layer=1,
       cats="1-99999999")
 }}}

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Ticket URL: <https://trac.osgeo.org/grass/ticket/2903#comment:7>
GRASS GIS <https://grass.osgeo.org>