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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hi Michael,<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">You could use r.cost with a cost map where all data outside area boundaries is NULL and rest is 1 (or resolution)…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><a href="https://grass.osgeo.org/grass76/manuals/r.cost.html">https://grass.osgeo.org/grass76/manuals/r.cost.html</a><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>
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<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>Michel Wortmann<br>
<b>Sent:</b> fredag 19. oktober 2018 15:48<br>
<b>To:</b> GRASS user list <grass-user@lists.osgeo.org><br>
<b>Subject:</b> [GRASS-user] Raster grow within area boundaries<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi team,<o:p></o:p></p>
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<p class="MsoNormal">I would like to grow the value of some pixels (e.g. streams) but only within irregular areas (e.g. subbasins), i.e. values of should not grow beyond the area boundary (as r.grow.distance would do). I could loop over each area, mask it and
use r.grow.distance and then patch it all together. But that is time consuming with several thousand areas. Does anyone have a better idea how to achieve this?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">E.g. (the boundaries argument doesn’t exist):<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Menlo",serif">r.grow.distance input=stream value=streams_grown boundaries=subbasins</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks a lot,<o:p></o:p></p>
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<p class="MsoNormal">Michel<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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