To whom it may concern:
Weeks ago I post a message about importing idrisi image files to GRASS. I got
little response. After going thru the whole procedure with defferent idrisi
settings, I now have successfully imported the files to GRASS.
The trick of Idrisi is that the image file you are going to export must be
itself in Integer Ascii format, not byte packed binary. so we have to use
CONVERT function to convert the idrisi image file to integer ascii format, if
not already that. Then use Import/export to export this image file to GRASS in
ascii format. FTP this new file to your GRASS directory, run r.in.ascii,
everything by now should work properly.
I think somebody may need this kind of informatin in future. So I post this to
the list. thanks,
Houxiang
From wangh2@gisserv20.geog.muohio.edu Wed Jan 28 02:05:18 1998
X-Authentication-Warning: isis.cecer.army.mil: listserv set sender to grass
using -f
Date: Tue, 27 Jan 1998 21:43:03 -0500
From: wangh2@gisserv20.geog.muohio.edu (Houxiang Wang GEO Grad 96)
To: grass@cecer.army.mil
Subject: importing raster files from Idrisi4.0 for DOS
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-MD5: j/EpKlRqCX+9rjbiwT9TDQ==Dear GRASS users:
I am having troubles importing files from idrisi4 for DOS, and hereby securing
helps from you. I posted the same request two weeks ago, but have not got many
responses.1. I exported idrisi4 files using ascii raster format. Then I edited the
files (deleting the first two lines of projection and zone, so there are six
lines in the header part). After ftp them to GRASS, I ran r.in.ascii to
finally
get GRASS format raster files. Everything looked okay. However, when I tried
to
display it using d.rast (and p.map), it was blank--three or four non-sense
colorful lines at the top, and elsewhere was just white. I checked the file
under cellhd directory. It reads:
proj: 1
zone: 16
north: 4386270
south: 4351770
east: 730110
west: 686490
cols: 1454
rows: 1150
e-w resol: 30
n-s resol: 30
format: 0
compressed: 1
Actually the file is of UTM 16, and it is within the current region. I am not
sure of the last sentence above. Does it mean that the file is compressed so
that GRASS could not process it correctly?2. I also tried to export from idrisi using binary format, which produces two
directories--cell and cellhd, each of which contains one file of the same
name.
In grass I then ran r.support to get a color table for it. However, this time
it
was even worse--I couldn't get the file done.
I am stuck. Could someone give me some hints? Thanks a lot.
Houxiang