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<p class="MsoNormal">Hei Martin,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">What about:<o:p></o:p></p>
<p class="MsoNormal"><a href="https://grass.osgeo.org/grass78/manuals/addons/v.what.strds.timestamp.html">https://grass.osgeo.org/grass78/manuals/addons/v.what.strds.timestamp.html</a><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Written for the IRSAE course at Studenterhytta (Oslo, Norway), in order to e.g. spatio-temporal match temperature timeseries and GPS-tracking data.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Stefan<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" 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-dev <grass-dev-bounces@lists.osgeo.org>
<b>On Behalf Of </b>Veronica Andreo<br>
<b>Sent:</b> mandag 15. juni 2020 22:50<br>
<b>To:</b> Martin Landa <landa.martin@gmail.com><br>
<b>Cc:</b> GRASS developers list <grass-dev@lists.osgeo.org><br>
<b>Subject:</b> Re: [GRASS-dev] v.what.strds: timestamp column<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi Martin, <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Afaik, v.what.strds is just a wrapper for v.what.rast for all the maps in the raster time series. It does not consider the column time in the vector. Then there's t.vect.what.strds that uses a space-time vector data set (STVDS) to query
a STRDS, but in my opinion to create a STVDS is a bit of a hassle (one vector map per date).
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">The only module that I'm aware of that takes a vector with dates to query a STRDS is Luca's add-on t.rast.what.aggr (<a href="https://grass.osgeo.org/grass78/manuals/addons/t.rast.what.aggr.html" target="_blank">https://grass.osgeo.org/grass78/manuals/addons/t.rast.what.aggr.html</a>),
but it's aim is to get aggregates before or after the dates provided in the vector.<o:p></o:p></p>
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<p class="MsoNormal"><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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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">El lun., 15 jun. 2020 17:20, Martin Landa <<a href="mailto:landa.martin@gmail.com" target="_blank">landa.martin@gmail.com</a>> escribió:<o:p></o:p></p>
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<p class="MsoNormal">Hi,<br>
<br>
I am playing with `v.what.strds` in order to get space-time-related<br>
nearest raster value information from strds based on given timestamp<br>
stored in attribute table.<br>
<br>
Input: vector map with timestamp column, eg:<br>
<br>
cat|time<br>
6|2020-01-08 03:00:00<br>
<br>
Goal: get a single raster value from strds based on timestamp.<br>
<br>
cat|time|value<br>
6|2020-01-08 03:00:00|253<br>
<br>
Instead of that v.what.strds returns a new column for each raster map<br>
registered in strds.<br>
<br>
cat|time|map_1,map_2,map_3<br>
6|2020-01-08 03:00:00||253|<br>
<br>
Is there any other tool which could do the job or should I modify<br>
v.what.strds in order to solve this task? Eg.<br>
<br>
v.what.strds time_column=time ...<br>
<br>
Thanks for in advance, Martin<br>
<br>
-- <br>
Martin Landa<br>
<a href="http://geo.fsv.cvut.cz/gwiki/Landa" target="_blank">http://geo.fsv.cvut.cz/gwiki/Landa</a><br>
<a href="http://gismentors.cz/mentors/landa" target="_blank">http://gismentors.cz/mentors/landa</a><br>
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