[GRASS-dev] TGRASS: granularity question concerning MODIS LST maps

[Sören Gebbert]

Hi,
>From 10:30 to 13:30 are 180 minutes. This is the smallest gap size between
the time instances. And it is the greatest common divider between all gaps
in the time series.

Ciao
Sören
Am 12.09.2015 12:29 schrieb "Markus Neteler" <neteler at osgeo.org>:

> Hi,
>
> I am registering in GRASS GIS 7.0 some 20000 MODIS LST maps following this
> scheme (4 maps per day):
>
> ...
> MYD11A1.A2014232.LST_Night_1km.reconstruct|2014-08-20 01:30
> MOD11A1.A2014232.LST_Day_1km.reconstruct|2014-08-20 10:30
> MYD11A1.A2014232.LST_Day_1km.reconstruct|2014-08-20 13:30
> MOD11A1.A2014232.LST_Night_1km.reconstruct|2014-08-20 22:30
> ...
> I fed this list into t.register.
>
> All runs fine I think, yet I don't understand the "Granularity" output
> here:
>
>
> t.info modis_lst_reconstructed
>  +-------------------- Space Time Raster Dataset
> -----------------------------+
>  |
>    |
>  +-------------------- Basic information
> -------------------------------------+
>  | Id: ........................
> modis_lst_reconstructed at modis_lst_reconstructed
>  | Name: ...................... modis_lst_reconstructed
>  | Mapset: .................... modis_lst_reconstructed
>  | Creator: ................... metz
>  | Temporal type: ............. absolute
>  | Creation time: ............. 2015-09-12 12:10:49.603736
>  | Modification time:.......... 2015-09-12 12:15:04.975590
>  | Semantic type:.............. mean
>  +-------------------- Absolute time
> -----------------------------------------+
>  | Start time:................. 2000-03-12 10:30:00
>  | End time:................... 2015-04-02 13:30:00
>  | Granularity:................ 180 minutes
>  | Temporal type of maps:...... point
>  +-------------------- Spatial extent
> ----------------------------------------+
>  | North:...................... 5447750.0
>  | South:...................... 770000.0
>  | East:.. .................... 7716750.0
>  | West:....................... 2168000.0
>  | Top:........................ 0.0
>  | Bottom:..................... 0.0
>  +-------------------- Metadata information
> ----------------------------------+
>  | Raster register table:......
> raster_map_register_ad09fa9530ea41bd826fc5fe56b0e47c
>  | North-South resolution min:. 250.0
>  | North-South resolution max:. 250.0
>  | East-west resolution min:... 250.0
>  | East-west resolution max:... 250.0
>  | Minimum value min:.......... 10610.0
>  | Minimum value max:.......... 13852.0
>  | Maximum value min:.......... 14426.0
>  | Maximum value max:.......... 19283.0
>  | Aggregation type:........... None
>  | Number of registered maps:.. 20156
>  |
>  | Title:
>  | Reconstructed LST for AQUA and TERRA with 4 overpasses per 24h
>  | Description:
>  | Reconstructed LST for AQUA and TERRA with 4 overpasses per 24h
>  | Command history:
>  | # 2015-09-12 12:10:49
>  | t.create output="modis_lst_reconstructed"
>  |     type="strds" semantictype="mean" temporaltype="absolute"
>  |     title="Reconstructed LST for AQUA and TERRA with 4 overpasses per
> 24h"
>  |     description="Reconstructed LST for AQUA and TERRA with 4 overpasses
> per 24h"
>  | # 2015-09-12 12:15:05
>  | t.register -i input="modis_lst_reconstructed"
>  |     type="rast" file="/tmp/filenames_modis_lst_maps.txt.tgrass.txt"
>  |
>
>  +----------------------------------------------------------------------------+
>
> Why a granularity of 180 minutes? If RTFM, where to find it?
>
> thanks,
> Markus
>
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