[GRASS-user] Working with large attribute table

[Veronica Andreo]

Hello Rich,

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.

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.

HTH,
Vero

[0] https://grass.osgeo.org/grass75/manuals/t.create.html
[1] https://grass.osgeo.org/grass75/manuals/t.register.html
[2] https://grass.osgeo.org/grass75/manuals/temporalintro.html
[3] https://grasswiki.osgeo.org/wiki/Temporal_data_processing


El mié., 11 jul. 2018 a las 20:57, Rich Shepard (<rshepard at appl-ecosys.com>)
escribió:

>    I have a point map of weather stations and records since about 2005. The
> attribute table has 113,570 rows; each row has the station name and date as
> the primary key and there are 20 attribute columns. The reason I imported
> all 20 attributes is to learn how to turn this map into a spatio-temporal
> vector. The data have lon-lat geographic coordinates and were reprojected
> to
> the project location's SRS.
>
>    I'm trying to obtain attribute data for the two stations within the
> project area by clicking on the point using the 'query item' button on the
> map display window.
>
>    One worked fine; the other shows a clock and doesn't produce a result
> even
> after a 5 minute wait.
>
>    Is this an unusual request of grass on a 32-bit workstation with 4G RAM?
>
> Rich
>
>
>
>
>
>
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