Space time datasets represent spatio-temporal fields in the temporal GRASS framework. They are designed to collect any amount of time stamped maps with time intervals and time instances. The temporal type of a space time dataset can be absolute or relative and must be set on dataset creation besides the name and the description.
Time stamped maps can registered in and unregistered from space time datasets. The spatio-temporal extent as well as the metadata of a space time dataset is derived from its registered maps. Hence the metadata is dependent from the dataset type (raster, 3D raster, vector).
MAPS="map_1 map_2 map_3 map_4 map_5 map_6 map_7"
for map in ${MAPS} ; do
r.mapcalc --o expr="${map} = rand(0, 10)"
echo ${map} >> map_list.txt
done
t.create type=strds temporaltype=absolute \
output=precipitation_daily \
title="Daily precipitation" \
description="Test dataset with daily precipitation"
t.register -i type=rast input=precipitation_daily \
file=map_list.txt start=2012-08-20 increment="1 days"
t.info type=strds input=precipitation_daily
+-------------------- Space Time Raster Dataset -----------------------------+
| |
+-------------------- Basic information -------------------------------------+
| Id: ........................ precipitation_daily@test
| Name: ...................... precipitation_daily
| Mapset: .................... test
| Creator: ................... soeren
| Creation time: ............. 2013-07-13 12:18:52.848223
| Temporal type: ............. absolute
| Semantic type:.............. mean
+-------------------- Absolute time -----------------------------------------+
| Start time:................. 2012-08-27 00:00:00
| End time:................... 2012-09-03 00:00:00
| Granularity:................ 1 day
| Temporal type of maps:...... interval
+-------------------- Spatial extent ----------------------------------------+
| North:...................... 80.0
| South:...................... -1.0
| East:.. .................... 120.5
| West:....................... -40.5
| Top:........................ 0.0
| Bottom:..................... 0.0
+-------------------- Metadata information ----------------------------------+
| Raster register table:...... precipitation_daily_test_raster_register
| North-South resolution min:. 1.0
| North-South resolution max:. 1.0
| East-west resolution min:... 1.0
| East-west resolution max:... 1.0
| Minimum value min:.......... 0.0
| Minimum value max:.......... 0.0
| Maximum value min:.......... 9.0
| Maximum value max:.......... 9.0
| Number of registered maps:.. 7
|
| Title:
| Daily precipitation
| Description:
| Test dataset with daily precipitation
| Command history:
| # 2013-07-13 12:18:52
| t.create type="strds" temporaltype="absolute"
| output="precipitation_daily" title="Daily precipitation"
| description="Test dataset with daily precipitation"
| # 2013-07-13 12:18:53
| t.register -i type="rast" input="precipitation_daily"
| file="map_list.txt" start="2012-08-20" increment="1 days"
|
+----------------------------------------------------------------------------+
Last changed: $Date$