By default r.patch is used to create a patched raster map. Especially for temporary data, using r.buildvrt for patching can be advantageous with regards to processing time and storage space. r.buildvrt creates a virtual raser map and is used when the v-flag is given. The v-flag excludes the z-flag (using zero (0) for transperancy) and s-flag (do not create color and category files).
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 sort option. Be aware that the sorting of the maps significantly influences the result of the patch. By default the maps are sorted by desc by the start_time so that the newest raster map is the first input map in r.patch/r.buildvrt.
Please note that the color table of the first input raster is used for the resulting map when the v-flag is used. Values in the resulting raster map that exeed the range of that first raster map will then be rendered on the screen like no data. In that case, please update the color table or the resulting map with r.colors
t.rast.patch is a simple wrapper for the raster module r.patch or r.buildvrt.
Patching the MODIS Land Surface Temperature for 2016 (filling missing pixels by subsequent maps in the time series):
t.rast.patch input=LST_Day_monthly@modis_lst output=LST_Day_patched_2016 \ where="start_time >= '2016-01' and start_time <= '2016-12'" r.info LST_Day_patched_2016
Patching the MODIS Land Surface Temperature for 2016 (filling missing pixels by subsequent maps in the time series) using a virtual mosaic (r.buildvrt):
t.rast.patch -v input=LST_Day_monthly@modis_lst output=LST_Day_patched_2016_vrt \ where="start_time >= '2016-01' and start_time <= '2016-12'" # Assign a new color table that covers the entire range of the resulting map r.colors map=LST_Day_patched_2016_vrt color=grey r.info LST_Day_patched_2016_vrt
Available at: t.rast.patch source code (history)
Latest change: Tuesday Nov 05 09:35:47 2024 in commit: f00067506253c89598cffadc3c7fa07cff7233fd
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