[GRASS-user] remove islands and centroids out of areas

GRASS GRASS user
1

Dear list,

I have imported a shapefile, and want to remove islands, and centroids that are out of areas, is there any command to do this?

Thanks, and sorry for the silly question

Daniel

2

Hello Daniel,

Did you try with v.clean [0]? There’s also v.edit [1] and depending on how many islands and centroids you need to remove, maybe you can also take a look at: https://grass.osgeo.org/grass73/manuals/wxGUI.vdigit.html

HTH

Best,
Vero

[0] https://grass.osgeo.org/grass73/manuals/v.clean.html
[1] https://grass.osgeo.org/grass73/manuals/v.edit.html

···

2016-08-10 15:29 GMT-03:00 Daniel Torres <nobeeakon@gmail.com>:

Dear list,

I have imported a shapefile, and want to remove islands, and centroids that are out of areas, is there any command to do this?

Thanks, and sorry for the silly question

Daniel

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3

On Wed, Aug 10, 2016 at 8:29 PM, Daniel Torres <nobeeakon@gmail.com> wrote:

Dear list,
I have imported a shapefile, and want to remove islands, and centroids that
are out of areas, is there any command to do this?

If you used v.in.ogr with the default settings, there should not be
artefacts such as centroids outside areas. Can you provide the command
you used to import the shapefile and the full output of the command?
That would help to find out why there are centroids outside of any
areas.

What exactly do you mean with "remove islands"? You can try the
v.in.ogr option min_area or afterwards remove small areas with v.clean
tool=rmarea which would also remove small holes in polygons.

Markus M