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<body class='hmmessage'><div dir='ltr'><p class="MsoNormal">Hallo everybody, <o:p></o:p></p><p class="MsoNormal"><br></p>
<p class="MsoNormal">I am trying to aggregate some time-stamped raster (placed in
an initial space-time dataset) but I have some problems; each raster represents
a 1h-cumulated rainfall, so I have something like this:<o:p></o:p></p><p class="MsoNormal"><br></p>
<p class="MsoNormal">raster1 | start_time 2014-09-04 12:00:00 | end_time 2014-09-04 13:00:00<o:p></o:p></p>
<p class="MsoNormal">raster2 | start_time 2014-09-04 13:00:00 | end_time 2014-09-04 14:00:00<o:p></o:p></p>
<p class="MsoNormal">etc<o:p></o:p></p>
<p class="MsoNormal"><br></p><p class="MsoNormal">I would like to aggregate from a certain datetime backward adopting
different granularities (2 hours, 3 hours, 4 hours, 5hours and 6 hours) but not
in a “massive” way, I <span style="font-size: 12pt;"> </span><span style="font-size: 12pt;">just </span><span style="font-size: 12pt;">need the first aggregation for each granularity. I
came up with something like this:</span></p><p class="MsoNormal"><br></p>
<p class="MsoNormal">for i in `seq 2 1 6` ;<o:p></o:p></p>
<p class="MsoNormal">do t.rast.aggregate -- o input=initial_dataset output=${i}h_aggregate method=sum basename=${i}h_aggregate granularity="$i hours" sampling=contains where="start_time = datetime('2014-09-04
14:00:00','-$i hours') and end_time
<= '2014-09-04 12:00:00'");<o:p></o:p></p>
<p class="MsoNormal">done;<o:p></o:p></p>
<p class="MsoNormal"><br></p><p class="MsoNormal">For i=2 for example, I would like to sum up raster1 and
raster2; if I ask for a t.rast.list of the 2h_aggregate dataset, star and end
time seem correct but if I do a query directly on one point of the raster maps
(raster1, raster2 and the output of the aggregation) I see that the results aren’t
correct. It seems that it didn’t perform the
aggregation. It's because of the where query? <o:p></o:p></p>
<p class="MsoNormal"><br></p><p class="MsoNormal">Thanks for your help.<o:p></o:p></p>
<p class="MsoNormal">Maria Elena<o:p></o:p></p><br><br><p class="ecxMsoAutoSig"><br></p> </div></body>
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