DESCRIPTION

t.rast.bandcalc performs a spatio-temporal mapcalc expression on maps of temporally sampled space time raster datasets (STRDS). It uses a single STRDS as input and calculates a new STRDS according to expression from different bands included in the input STRDS. This is useful to e.g. calculcate a time-series of NDVI or EVI maps, or any other indices based on several different input bands.

This module is a front-end for t.rast.mapcalc.

Different bands must be referenced in the expression by data[index] with index being a number starting with 0. For example, with Sentinel-2, data[3] refers to the fourth Sentinel-2 band "S2_4 Visible (Red)". t.rast.bandcalc replaces data[index] with the according selections of the input STRDS.

This module expects several parameters. The resulting space time raster dataset must be specified in the output option together with the basename of generated raster maps that are registered in the resulting STRDS. Empty maps resulting from map-calculation are not registered by default. This behavior can be changed with the -n flag. The flag -s can be used to assure that only spatially related maps in the STRDS's are processed. Spatially related means that temporaly related maps overlap in their spatial extent.

SEE ALSO

t.rast.mapcalc, i.band.library, r.semantic.label

Temporal data processing Wiki

AUTHOR

Markus Metz, mundialis, Germany