Dear GRASS community,
now r.in.arctiff script is available. It allows to import
TIFF files (from ARC/INFO as well as other systems) in conjunction
with a corresponding .tfw file, which contains coordinate and
resolution information. The support file (which has to be created
usually through r.support) is created automatically using the
coordinate and res. parameters from the .tfw file.
Find the GRASS script on my homepage:
Bereich Geographie – Naturwissenschaftliche Fakultät – Leibniz Universität Hannover
If you agree (maybe after improving parts of the code, which are
not elegant due to my limited programming knowledge 
),
I will put it into forthcoming GRASS 4.2.1 (v.19) distribution.
Best regards
Markus Neteler
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Geographisches Institut | Institute of Geography
Physische Geographie Physical Geography
& Landschaftsoekologie & Landscape Ecology
Universitaet Hannover University of Hannover, Germany
neteler@geog.uni-hannover.de
Bereich Geographie – Naturwissenschaftliche Fakultät – Leibniz Universität Hannover
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Hi Markus,
that really sounds good! But a question for better understanding: if I
have no *.tfw file, I just have to create one consisting of:
east west resolution
0.000000000
0.000000000
-1 * east west resolution
eastern boundary
northern boundary
That is what I understand from r.out.arctiff... I am wondering, why
the north_south_resol. is not used???
Regards,
Stephan
--
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Stephan Eickschen Tel. : +49 (0)251 83-34704
Westfaelische Wilhelms-Universitaet Fax. : +49 (0)251 83-36100
Institute for Geophysics
Research Unit of Physical Glaciology email: eicksch@uni-muenster.de
Corrensstrasse 24
48149 Muenster
Germany
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Sorry to interrupt but the info may be useful.
I believe the correct world file definition would be:
10.0 "e-w resol" Size of pixel in x direction.
0.0 N\A Rotation term for row (usually 0).
0.0 N\A Rotation term for column (usually 0).
-10.0 "n-s resol" Size of pixel in y direction(- sign is needed!)
590005 "west" + 1/2 "e-w resol"
The x coordinate of pixel in upper left corner.
4927995 "north" - 1/2 "n-s resol"
The y coordinate of pixel in upper left corner.
ArcView georeferences the center of the pixel while GRASS uses the NW edge
in the cellhd file. There is a small adjustment to be made: you need to add
half the pixel resolution to the west and subtract half the pixel
resolution from the north.
Hi Markus,
that really sounds good! But a question for better understanding: if I
have no *.tfw file, I just have to create one consisting of:
east west resolution
0.000000000
0.000000000
-1 * east west resolution
eastern boundary
northern boundary
That is what I understand from r.out.arctiff... I am wondering, why
the north_south_resol. is not used???
Regards,
Stephan
------------------------------------
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Global Geomatics Inc.(formerly L.A.S. Inc.)
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