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

[Markus Neteler]

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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