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Digitizing in ILWIS (opensource)
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Digitizing in ILWIS (opensource) Yalin 05-14-2008
Posted by Yalin on May 14, 2008, 7:22 pm
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 Hello:

I have an image (TIFF) that created by taking a screenshot of a map. I
have georeferenced this image in ILWIS and now want to digitize areas of
this map. I can digitize using the segment operation using one of my
GeoTIFF's, but for this TIFF that I created it doesn't seem to work. I
have created a domain (Group type) for this and have followed all the
appropriate steps. Any suggestions on what the problem could be?

Posted by gasenngo on June 14, 2008, 7:20 am
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 Try to geo-reference your image using tie-point then perform a
transformation.

The result will be a geo-corrected image. I believe this is the right
type of image that can be used to digitizing in WLWIS.

The procedures in WLWIS is a bit more complicated than commercial
packages since it was design for learning: user have to do more but
will gain more understanding at the end.

Start with the help under the Digitizing section, then with the User-
guide here, as I remember it should have instruction and even step-by-
step tutorial on most of the Ilwis operation.

http://52north.org/index.php?option=com_content&task=view&id=149&Itemid=127

Posted by Quivis on June 15, 2008, 6:18 am
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to the folks in comp.infosystems.gis:

> I have an image (TIFF) that created by taking a screenshot of a
> map. I have georeferenced this image in ILWIS and now want to
> digitize areas of this map. I can digitize using the segment
> operation using one of my GeoTIFF's, but for this TIFF that I
> created it doesn't seem to work. I have created a domain (Group
> type) for this and have followed all the appropriate steps. Any
> suggestions on what the problem could be?

Being a novice at Ilwis I can't really help, I've just begun using
it. Very nice app, but does things a bit backwards compared to other
apps.

One thing I wonder is, what does the error message say, if there is
one? It's always a good idea to use the F1 key while error dialogs
pop up. Sometimes there is help, sometimes there's not. Since Ilwis
has a really good help file, there ought to be at least some info
about it.

Have you downloaded all of the "lessons" (or whatever they should be
called) and tried looking through them?
--
Quivis
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