[GRASS-dev] Random selection of a given number of points/pixels per class

[Stefan Blumentrath]

Yes, thanks! Thats it. Thanks also for reviewing the PR so quickly!

Cheers
Stefan

From: Anna Petrášová <kratochanna at gmail.com>
Sent: fredag 30. august 2019 20:47
To: Stefan Blumentrath <Stefan.Blumentrath at nina.no>
Cc: GRASS developers list <grass-dev at lists.osgeo.org>
Subject: Re: [GRASS-dev] Random selection of a given number of points/pixels per class

r.sample.category in addons seems like what you want?

On Fri, Aug 30, 2019 at 3:59 AM Stefan Blumentrath <Stefan.Blumentrath at nina.no<mailto:Stefan.Blumentrath at nina.no>> wrote:
Dear devs,

Recently, I was trying to generate a fixed number of random points per class in a vector or raster map.

So I looked at both v.random and r.random. However, neither seemed to give me the desired result:
v.random with restrict option seems to generate points per area even if areas belong to the same class and share the same cat value.
r.random does not have a restrict option.

So I ended up writing a small script that basically loops over the classes and extracts n points/pixels per class from a input raster map. My question now is did I overlook some less obvious feature of v.random or r.random?
If not I might create a small wrapper addon…

Cheers
Stefan
_______________________________________________
grass-dev mailing list
grass-dev at lists.osgeo.org<mailto:grass-dev at lists.osgeo.org>
https://lists.osgeo.org/mailman/listinfo/grass-dev
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/grass-dev/attachments/20190901/9bcc74c8/attachment.html>