r.out.gdal(1)

NAME
r.out.gdal - Exports GRASS raster data into various formats (requires GDAL)

KEYWORDS
raster, export

SYNOPSIS
r.out.gdal
r.out.gdal help
r.out.gdal [-l] [input=string] [format=string] [type=string] [output=string] [createopt=string[,string,...]] [metaopt=string[,string,...]]

  Flags:

-l  list supported output formats

  Parameters:

input=string
    Name of input raster map

format=string
    GIS format to write (case sensitive, see also -l flag) Options: AAIGrid,BMP,BSB,DTED,ELAS,ENVI,FIT,GIF,GTiff,HFA,JPEG,MEM,MFF,MFF2,NITF,PAux,PNG,PNM,VRT,XPM Default: GTiff

type=string
    file type Options: Byte,Int16,UInt16,UInt32,Int32,Float32,Float64,CInt16,CInt32,CFloat32,CFloat64

output=string
    Name of output 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

DESCRIPTION
r.out.gdal outputs GRASS raster maps into various GIS formats as supported by GDAL. This script is based on 'gdal_translate', it's parameters are similar to those of ’gdal_translate'. It requires the installation of either GDAL with GRASS support or of the GDAL-OGR-GRASS plugin which is available from the GDAL web site.

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").

SUPPORTED FORMATS
The set of supported formats written by r.out.gdal depend 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". Multiple options have to be specified as 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 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.

EXAMPLE
Export of the map 'elevation.dem' from the Spearfish data set:
r.out.gdal elevation.dem format=GTiff type=Int16 output=elev_dem.tif

REFERENCES
GDAL library

Compile and install GRASS and QGIS with GDAL/OGR Plugin

SEE ALSO
r.out.arc, r.out.ascii, r.out.tiff

AUTHOR
Markus Neteler, ITC-irst, Italy

Last changed: $Date: 2006/08/14 15:32:17 $

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