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De: Houxiang Wang GEO Grad 96 <wangh2@gisserv20.geog.muohio.edu>
A: grass@cecer.army.mil
Asunto: Successful importing raster files from Idrisi4.0 for DOS
Fecha: jueves 5 de febrero de 1998 17:46To 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
This E_mail isn't concerning with GRASS and LINUX anymore.
Don't send more messages.
Thanks!