r.out.arc - Converts a raster map layer into an ESRI ARCGRID file.
r.out.arc [-h1] input=string output=string [dp=integer]
- Suppress printing of header information
- List one entry per line instead of full row
- Name of an existing raster map layer
- Name of an output ARC-GID map (use out=- for stdout)
- Number of decimal places
- Default: 8
r.out.arc converts a user-specified raster map layer
(input=name) into an ESRI ARC-GRID ascii file
(output=name) suitable for export to other computer systems.
The dp=value option (where value is a number of the user's
choice) can be used to request that numbers after decimal points are
limited. However, to use this, the user should know the maximum number of
digits that will occur in the output file. The user can find the maximum
number of digits occurring in the output file by running r.out.arc
without the dp=value option.
The GRASS program r.in.arc can be used
to perform the reverse function, converting an ESRI ARC-GRID ascii file in
suitable format to GRASS raster file format. The order of cell values in
file is from lower left to upper right (reverse to GRASS).
The output from r.out.arc may also be placed into a file
by using the UNIX redirection mechanism; e.g.:
The output file out.grd can then be copied
onto a CDROM or floppy disk for export purposes.
r.out.arc input=soils output=- > out.grd
An Arc ASCII grid can be loaded into ArcGIS 8.3 though ArcToolbox.
Use the "Import to Raster" -> "ASCII to Grid" tool to create a binary grid
which can be selected using ArcCatalog. The spatial analyst extension may
need to be installed and activated within Arc.
In ArcGIS 9.0 the import tool can be found at:
ArcMap -> Toolbox -> Conversion Tools -> To Raster -> ASCII to Raster
A GeoTIFF created with r.out.gdal is
sometimes a better solution for transferring raster maps to other GIS software.
Markus Neteler, University of Hannover, Germany,
based on r.out.ascii written by
U.S.Army Construction Engineering Research Laboratory
Last changed: $Date: 2005/12/12 14:53:40 $
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