t.rast.seriesgrass - Online in the Cloud

PROGRAM:

NAME

t.rast.series - Performs different aggregation algorithms from r.series on all or a
subset of raster maps in a space time raster dataset.

KEYWORDS

temporal, series, raster, time

SYNOPSIS

t.rast.series
t.rast.series --help
t.rast.series [-tn] input=name method=string [order=string[,string,...]]
[where=sql_query] output=name [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:
-t
Do not assign the space time raster dataset start and end time to the output map

-n
Propagate NULLs

--overwrite
Allow output files to overwrite existing files

--help
Print usage summary

--verbose
Verbose module output

--quiet
Quiet module output

--ui
Force launching GUI dialog

Parameters:
input=name [required]
Name of the input space time raster dataset

method=string [required]
Aggregate operation to be performed on the raster maps
Options: average, count, median, mode, minimum, min_raster, maximum, max_raster,
stddev, range, sum, variance, diversity, slope, offset, detcoeff, quart1, quart3,
perc90, quantile, skewness, kurtosis
Default: average

order=string[,string,...]
Sort the maps by category
Options: id, name, creator, mapset, creation_time, modification_time,
start_time, end_time, north, south, west, east, min, max
Default: start_time

where=sql_query
WHERE conditions of SQL statement without ’where’ keyword used in the temporal GIS
framework
Example: start_time > ’2001-01-01 12:30:00’

output=name [required]
Name for output raster map

DESCRIPTION

t.rast.series is a simple wrapper for the raster module r.series. It supports a subset of
the aggregation methods of r.series.

The input of this module is a single space time raster dataset, the output is a single
raster map layer. A subset of the input space time raster dataset can be selected using
the where option. The sorting of the raster map layer can be set using the order option.
Be aware that the order of the maps can significantly influence the result of the
aggregation (e.g.: slope). By default the maps are ordered by start_time.

EXAMPLE

Estimate average temperature for the whole time series
t.rast.series input=tempmean_monthly output=tempmean_general method=average
Estimate average temperature for all January maps in the time series, the so-called
climatology
t.rast.series input=tempmean_monthly
method=average output=tempmean_january
where="strftime(’%m’, start_time)=’01’"
# equivalently, we can use
t.rast.series input=tempmean_monthly
output=tempmean_january method=average
where="start_time = datetime(start_time, ’start of year’, ’0 month’)"
# if we want also February and March averages
t.rast.series input=tempmean_monthly
output=tempmean_february method=average
where="start_time = datetime(start_time, ’start of year’, ’1 month’)"
t.rast.series input=tempmean_monthly
output=tempmean_march method=average
where="start_time = datetime(start_time, ’start of year’, ’2 month’)"
Generalizing a bit, we can estimate monthly climatologies for all months by means of
different methods
for i in `seq -w 1 12` ; do
for m in average stddev minimum maximum ; do
t.rast.series input=tempmean_monthly method=${m} output=tempmean_${m}_${i}
where="strftime(’%m’, start_time)=’${i}’"
done
done

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