Image conversion among GRASS, ERDAS, PCI
Wang Song
wang at cast.uark.edu
Wed Apr 7 14:35:20 EDT 1993
GRASS users sometimes need to exchange the imagery data between GRASS
raster format and other image processing package supported formats, such as
ERDAS and PCI, etc. I would like to share some thoughts about general methods
to transfer imagery data between GRASS and ERDAS or PCI.
(1) Interface between GRASS and ERDAS:
Special interface:
ERDAS --> GRASS: Use GRASS command r.in.erdas which requires
ERDAS image file in 7.3 version format.
GRASS --> ERDAS: ERDAS command RDGRASS converts 8-bit uncompressed
GRASS raster file into ERDAS GIS files.
General Interface:
ERDAS --> GRASS: Use ERDAS command DPDATA to convert ERDAS image
data to the general image binary format, load it
directly into GRASS LOCATION cell subdirectory.
Then create a cellhd file with the information
provided by ERDAS command LISTIT.
If the converted ERDAS file contains multi-band
imagery, you need to use GRASS i.tape.other to
load it into a GRASS image group.
GRASS --> ERDAS: Preparation: Directly copy a GRASS raster file from
$LOCATION/cell subdirectory into your current
directory. Also, copy the cellhd file for the
reference. If GRASS raster data is in compressed
format, you need to uncompress it with
r.compress -u.
Use ERDAS program LDDATA to convert either 8 or
16 bits GRASS binary raster data into ERDAS. All
parameters required by LDDATA has been defined in
GRASS raster header file.
(2) Interface between GRASS and PCI (5.1 version):
Special Interface: NO
General Interface:
PCI --> GRASS: Use PCI Generic File transfer command IMAGEWR to
Write the PCIDSK file into a generic image file
format without header in it. Then move this file
directly into GRASS $LOCATION/cell directory and
create a cell header file with the information
provided by the parameter file to run IMAGEWR.
GRASS --> PCI: Use PCI Generic File transfer command IMAGERD to
directly read GRASS raster binary file from
$LOCATION/cell directory into PCIDSK image file.
The GRASS cell header file provides all necessary
information to run IMAGERD in PCI.
****************************************************************************
# # ## # # #### Wang Song (wang)
# # # # ## # # #
# # # # # # # # Center for Advanced Spatial Technologies
# ## # ###### # # # # ### 12 Ozark Hall
## ## # # # ## # # University of Arkansas
# # # # # # #### Fayetteville, AR 72701
INTERNET: wang at cast.uark.edu Tel: (501) 575-6159
FAX: (501) 575-3846
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