<div dir="ltr"><div>Hello Rich, <br></div><div><br></div><div>The concept of time series in GRASS GIS is based on a snapshot approach, i.e., each map represents a specific date or time interval. For the vector type case, you can either split each date as a different vector map or (if, as in your case, the coordinates are always the same) put each date in a different layer of the same vector map. <br></div><div><br></div><div>To create a time series of vector maps, you would then, need to use t.* modules, esp. t.create [0] and t.register [1]. You can check the temporal intro manual page [2] for a general description of the temporal framework and the temporal data processing wiki [3] for more (raster oriented, sorry) examples.</div><div><br></div><div>HTH,</div><div>Vero</div><div><br></div><div>[0] <a href="https://grass.osgeo.org/grass75/manuals/t.create.html">https://grass.osgeo.org/grass75/manuals/t.create.html</a><br></div><div>[1] <a href="https://grass.osgeo.org/grass75/manuals/t.register.html">https://grass.osgeo.org/grass75/manuals/t.register.html</a></div><div>[2] <a href="https://grass.osgeo.org/grass75/manuals/temporalintro.html">https://grass.osgeo.org/grass75/manuals/temporalintro.html</a><br></div><div>[3] <a href="https://grasswiki.osgeo.org/wiki/Temporal_data_processing">https://grasswiki.osgeo.org/wiki/Temporal_data_processing</a><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr">El mié., 11 jul. 2018 a las 20:57, Rich Shepard (<<a href="mailto:rshepard@appl-ecosys.com">rshepard@appl-ecosys.com</a>>) escribió:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> I have a point map of weather stations and records since about 2005. The<br>
attribute table has 113,570 rows; each row has the station name and date as<br>
the primary key and there are 20 attribute columns. The reason I imported<br>
all 20 attributes is to learn how to turn this map into a spatio-temporal<br>
vector. The data have lon-lat geographic coordinates and were reprojected to<br>
the project location's SRS.<br>
<br>
I'm trying to obtain attribute data for the two stations within the<br>
project area by clicking on the point using the 'query item' button on the<br>
map display window.<br>
<br>
One worked fine; the other shows a clock and doesn't produce a result even<br>
after a 5 minute wait.<br>
<br>
Is this an unusual request of grass on a 32-bit workstation with 4G RAM?<br>
<br>
Rich<br>
<br>
<br>
<br>
<br>
<br>
<br>
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