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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Ciao Madi, Vero,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Starting with GRASS 7.6, also centroids are used to get the raster representation of your area vector map. That increases the likelihood of smaller areas to be rasterized.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Increasing the resolution of the current region alone does not help, because v.rast.stats temporarily changes the computational region to align with the input raster map(s) (see also:
<a href="https://trac.osgeo.org/grass/ticket/3523">https://trac.osgeo.org/grass/ticket/3523</a> and
<a href="https://trac.osgeo.org/grass/ticket/3598">https://trac.osgeo.org/grass/ticket/3598</a> for discussion) Even if the first ticket is closed, comments are welcome.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">It might make sense to add a flag to v.rast.stats like in r.slope.aspect to not align the computational region.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Furthermore, with regards to efficiency, v.strds.stats could gain some speed if multi-raster support in v.rast.stats - added in G 7.6 - would be handed down to the addon. Might almost
double the speed for larger STRDS…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Cheers<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Stefan<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> grass-user <grass-user-bounces@lists.osgeo.org>
<b>On Behalf Of </b>Veronica Andreo<br>
<b>Sent:</b> onsdag 6. februar 2019 17:20<br>
<b>To:</b> Margherita Di Leo <diregola@gmail.com><br>
<b>Cc:</b> GRASS user list <grass-user@lists.osgeo.org><br>
<b>Subject:</b> Re: [GRASS-user] sample a strds at specific locations (areas)<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi Madi<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">El mié., 6 feb. 2019 a las 16:31, Margherita Di Leo (<<a href="mailto:diregola@gmail.com">diregola@gmail.com</a>>) escribió:<o:p></o:p></p>
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<p class="MsoNormal">I have a question regarding v.strds.stats. I get the following warning message:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">WARNING: Not all vector categories converted to raster. Converted 120 of 265.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">What could be the reason for that?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Some vector areas might not be converted because they are too small with respect to the pixel size that you try to query. Others will tell better but I think the polygon must overlap the center of the pixel in order to be converted into
raster. One solution could be to resample your rasters to a higher resolution.<o:p></o:p></p>
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<p class="MsoNormal">HTH, <o:p></o:p></p>
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<p class="MsoNormal">Vero<o:p></o:p></p>
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