[GRASS-dev] [GRASS GIS] #3352: Behavior of v.sort.points

[Steven Pawley]

Thanks Moritz for explaining that.

I suspected that there was something incorrect with my expectations, but
I'm glad that (1) was caught.

Steve



On Sat, May 27, 2017 at 10:04 AM, GRASS GIS <trac at osgeo.org> wrote:

> #3352: Behavior of v.sort.points
> --------------------------+-------------------------
>   Reporter:  spawley      |      Owner:  grass-dev@…
>       Type:  defect       |     Status:  closed
>   Priority:  normal       |  Milestone:  7.4.0
>  Component:  Addons       |    Version:  unspecified
> Resolution:  fixed        |   Keywords:
>        CPU:  Unspecified  |   Platform:  Linux
> --------------------------+-------------------------
>
> Comment (by mlennert):
>
>  Replying to [comment:2 mlennert]:
>  > Replying to [ticket:3352 spawley]:
>  >
>  > > (2) even if 'cat' is the first column, sorting by an integer column
>  does not appear to be sorting point datasets in numeric order. Example
>  from the nc_spm location:
>  > >
>  > > v.sort.points input=firestations at PERMANENT output=firestations_sorted
>  column=ID
>  > >
>  > > The order of the points based on opening the attribute table, and the
>  relationship between the 'ID' column and 'cat' appears to be the same as
>  the original dataset, where 'ID' was not in ascending order.
>  >
>  > This is not a bug: cat values are conserved, i.e. the same points have
>  the same cat value in the input and the output. However, points are in a
>  different order in the file after v.sort.points. Category values of
>  objects do not define order.
>
>  Try
>
>
>  {{{
>  d.vect map=firestations icon=basic/circle size=0.5 size_column=ID
>  d.vect map=firestations_sorted icon=basic/circle size=0.5 size_column=ID
>  }}}
>
>  and compare the two maps to see the difference.
>
>  Moritz
>
> --
> Ticket URL: <https://trac.osgeo.org/grass/ticket/3352#comment:3>
> GRASS GIS <https://grass.osgeo.org>
>
>
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