## DESCRIPTION

t.rast.contour is designed to produce a space time vector dataset of specified contours from a space time raster dataset. This module works as a front-end to r.contour and therefore supports all parameter of this module. Hence, all raster map layers in a space time raster dataset are successively passed to r.contour that computes the contour lines. Please refer to the r.contour documentation for a detailed description. The new generated vector contour map layers will be registered in the output space time vector dataset, using the same time stamps as their raster map layer origins.

This module supports the parallel processing of r.contour module instances. The number of parallel processes can be set with the nprocs option. However, this will only work in conjunction with the -t flag, that avoids the creation of attribute tables. The parallel creation of attribute tables is not supported.

The where option allows selecting subsets of the input space time raster dataset.

The flag -n can be used to force the registration of empty vector map layers. Empty vector maps may occur in case that empty raster map layers should be converted into vector map layers, or in case the chosen steps or contour levels are not present in the raster map layers.

## SEE ALSO

r.contour, t.rast.db.select, t.info

## AUTHOR

Sören Gebbert, Geoinformatikbüro Dassau