This is the command r.external.outgrass that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
NAME
r.external.out - Defines raster output format utilizing GDAL library.
KEYWORDS
raster, export, output, external
SYNOPSIS
r.external.out
r.external.out --help
r.external.out [-frp] directory=path [extension=string] format=string
[options=string[,string,...]] [--help] [--verbose] [--quiet] [--ui]
Flags:
-f
List supported formats and exit
-r
Cease using GDAL and revert to native output
-p
Print current status
--help
Print usage summary
--verbose
Verbose module output
--quiet
Quiet module output
--ui
Force launching GUI dialog
Parameters:
directory=path [required]
Name of output directory
extension=string
Extension for output files
format=string [required]
Format of output files
Options: VRT, GTiff, NITF, HFA, ELAS, AAIGrid, DTED, PNG, JPEG, MEM, GIF, XPM, BMP,
PCIDSK, PCRaster, ILWIS, SGI, SRTMHGT, Leveller, Terragen, GMT, netCDF, HDF4Image,
ISIS2, ERS, JP2OpenJPEG, FIT, JPEG2000, RMF, WMS, RST, INGR, GSAG, GSBG, GS7BG, R,
PNM, ENVI, EHdr, PAux, MFF, MFF2, BT, LAN, IDA, LCP, GTX, NTv2, CTable2, KRO, ARG,
USGSDEM, ADRG, BLX, Rasterlite, EPSILON, PostGISRaster, SAGA, KMLSUPEROVERLAY, XYZ,
HF2, PDF, WEBP, ZMap
options=string[,string,...]
Creation options
DESCRIPTION
r.external.out instructs GRASS to write raster maps as data files (e.g. GeoTIFF) using
GDAL.
NOTES
A relative directory path (parameter directory) is interpreted relative to the current
mapset directory, not the current directory where the command was launched. An unspecified
or empty directory (which will occur if the user passes a simple filename for output)
results in the output file being placed in the "gdal/" subdirectory of the current mapset
directory.
EXAMPLE
The module r.external.out can be used along with r.external to process external geodata in
GRASS while writing out the results directly in GeoTIFF:
# register GeoTIFF file to be used in current mapset:
r.external input=terra_lst1km20030314.LST_Day.tif output=modis_celsius
# define output directory for files resulting from GRASS calculation:
r.external.out directory=$HOME/gisoutput/ format="GTiff"
# perform GRASS calculation (here: extract pixels > 20 deg C)
# this stores the output map directly as GeoTIFF:
r.mapcalc "warm.tif = if(modis_celsius > 20.0, modis_celsius, null() )"
# cease GDAL output connection and turn back to write GRASS raster files:
r.external.out -r
# now use the resulting file elsewhere
gdalinfo $HOME/gisoutput/warm.tif
REFERENCES
GDAL Pages: http://www.gdal.org/
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