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r.out.gdal
Langue: en
Version: 149964 (fedora - 04/07/09)
Section: 1 (Commandes utilisateur)
Sommaire
NAME
r.out.gdal - Exports GRASS raster map into GDAL supported formats.KEYWORDS
raster, exportSYNOPSIS
r.out.gdalr.out.gdal help
r.out.gdal [-l] [input=name] [format=string] [type=string] [output=name] [createopt=string[,string,...]] [metaopt=string[,string,...]] [nodata=float] [--verbose] [--quiet]
Flags:
- -l
List supported output formats- --verbose
Verbose module output- --quiet
Quiet module output
Parameters:
- input=name
Name of raster map (or group) to export- format=string
GIS format to write (case sensitive, see also -l flag)
Options: VRT,GTiff,NITF,HFA,ELAS,AAIGrid,DTED,PNG,JPEG,MEM,GIF,FITS,XPM,BMP,PCIDSK,ILWIS,SGI,SRTMHGT,Leveller,Terragen,GMT,netCDF,HDF4Image,ERS,JPEG2000,FIT,RMF,RST,INGR,GSAG,GSBG,PNM,ENVI,EHdr,PAux,MFF,MFF2,BT,IDA,USGSDEM,ADRG,BLX
Default: GTiff- type=string
File type
Options: Byte,Int16,UInt16,UInt32,Int32,Float32,Float64,CInt16,CInt32,CFloat32,CFloat64- output=name
Name for output raster file- createopt=string[,string,...]
Creation option to the output format driver. Multiple options may be listed.- metaopt=string[,string,...]
Metadata key passed on the output dataset if possible- nodata=float
Assign a specified nodata value to output bands
DESCRIPTION
r.out.gdal allows a user to export a GRASS raster map layer into any GDAL supported raster map format. For possible metaopt parameters see the 'supported formats' pages of GDAL. The createopt may be used to create TFW or World files ("TFW=YES", "WORLDFILE=ON").r.out.gdal also supports the export of multiband rasters through a group (created e.g. with i.group), when the group's name is entered as input.
SUPPORTED RASTER FORMATS
The set of supported raster formats written by r.out.gdal depends on the local GDAL installation. Available may be (incomplete list):
AAIGrid: Arc/Info ASCII Grid
BMP: MS Windows Device Independent Bitmap
BSB: Maptech BSB Nautical Charts
DTED: DTED Elevation Raster
ELAS: ELAS
ENVI: ENVI .hdr Labelled
FIT: FIT Image
GIF: Graphics Interchange Format (.gif)
GTiff: GeoTIFF
HDF4Image: HDF4 Dataset
HFA: Erdas Imagine Images (.img)
JPEG2000: JPEG-2000 part 1 (ISO/IEC 15444-1)
JPEG: JPEG JFIF
MEM: In Memory Raster
MFF2: Atlantis MFF2 (HKV) Raster
MFF: Atlantis MFF Raster
NITF: National Imagery Transmission Format
PAux: PCI .aux Labelled
PCIDSK: PCIDSK Database File
PNG: Portable Network Graphics
PNM: Portable Pixmap Format (netpbm)
VRT: Virtual Raster
XPM: X11 PixMap Format
NOTES
When writing out GeoTIFF format for users of ESRI software or ImageMagick, the band interleaving should be switched to pixel interleaving using createopt="INTERLEAVE=PIXEL".To specify multiple options use a comma separated list (createopt="TFW=YES,COMPRESS=DEFLATE").
Out of the GDAL data types, the closest match for GRASS CELL, FCELL and DCELL rasters are respectively Int32, Float32 and Float64. These are not exact equivalents, but they will preserve the max possible data range and number of decimal places for each respective GRASS raster data type. Please keep in mind, that not all CELL rasters will require Int32 - e.g., 0-255 CELL raster are covered by the Byte type as well. Moreover, some GDAL-supported formats do not support all the data types possible in GDAL and GRASS. Use r.info to check the data type and range for your GRASS raster, refer to specific format documentation (GDAL website, format vendor's docs) and e.g. the Wikipedia article Typical boundaries of primitive integral types for details.
EXAMPLES
Export the integer raster roads map to GeoTIFF format:
r.out.gdal input=roads output=roads.tif type=UInt16
Export a DCELL raster map in GeoTIFF format suitable for ESRI software:
r.out.gdal in=elevation.10m out=ned_elev10m.tif type=Float64 createopt="INTERLEAVE=PIXEL,TFW=YES"
Export the floating point raster elevation map to ERDAS/IMG format:
r.out.gdal input=elevation.10m output=elev_dem10.img format=HFA type=Float32
GDAL RELATED ERROR MESSAGES
-
"ERROR 6: SetColorInterpretation() not supported for this dataset.": This may indicate that the color table was not written properly. But usually it will be correct and the message can be ignored.
"ERROR 6: SetNoDataValue() not supported for this dataset.": The selected output format does not support "no data". It is recommended to use a different output format.
"Warning 1: Lost metadata writing to GeoTIFF ... too large to fit in tag.": The color table metadata are too large. It is recommended to use a different output format.
SEE ALSO
The GDAL supported formats page.r.out.ascii, r.out.arc, r.out.bin, r.out.mat, r.out.png, r.out.ppm, r.out.tiff
r.out.gdal.sh (old shell script version using gdal_translate)
REFERENCES
GDAL Pages: http://www.gdal.orgAUTHOR
Vytautas Vebra (oliver4grass at gmail.com)Last changed: $Date: 2007-10-11 07:27:27 +0200 (Thu, 11 Oct 2007) $
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