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, 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, PostGISRaster, SAGA, KMLSUPEROVERLAY, XYZ, HF2, PDF, ZMap
- options=string[,string,...]
- Creation options
r.external.out instructs GRASS to write raster maps as data
files (e.g. GeoTIFF) using GDAL.
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.
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 in GRASS database:
r.external terra_lst1km20030314.LST_Day.tif out=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)
# write output directly as GeoTIFF:
r.mapcalc "warm.tif = if(modis_celsius > 20, modis_celsius, null() )"
# cease GDAL output connection and turn back to write GRASS raster files:
r.external.out -r
# use the result elsewhere
qgis $HOME/gisoutput/warm.tif
r.in.gdal,
r.out.gdal,
r.external
GDAL Pages:
http://www.gdal.org/
Glynn Clements
Last changed: $Date: 2014-05-29 06:23:58 +0200 (čt, 29 5 2014) $
Main index | Raster index | Topics index | Keywords index | Full index
© 2003-2015 GRASS Development Team, GRASS GIS 7.0.1 Reference Manual