[GRASS-user] d.rast.edit does not save edited cells (?)

[Nikos Alexandris]

It makes (some) sense for me. I was and still am doing  a lot of visual
interpretation (currently upon MODIS imagery).

I need to collect samples for i.smap for example and with MODIS (MOD09,
250m pix.res) this task is a challenge. And I am not only digitising
samples from the scratch, but I use also some classes (e.g. Urban) from
valid existing land cover maps. Yet, I need to correct the borders for
some of these Urban areas.

From this perspective all kinds of "ancillary" data are useful. Aspect
helped me to identify some flat areas in agricultural zones (it is
expected that flat areas have "one" common aspect... no?). It would be
even more useful if DEM values (pure numbers) could be visualized (like
"add cell values layer") or any kind of values from a thematic map.

Sure there other ways to support that... but I still think that the best
way to get the highest accuracy for land cover mapping is not the
"automatic" way. It's necessary to get involved!

This is why I like the "link" option in OpenEV (FWTools), the "cell
value layer", the "directional arrows layer".

Thank you Glynn,

Nikos

On Fri, 2008-02-22 at 09:07 +0000, Glynn Clements wrote:
> Nikos Alexandris wrote:
> 
> > > However, this only replaces non-null cells. Any null cells result in
> > > the corresponding cells in the orignal map remaining untouched.
> > > 
> > > I could fix d.rast.edit to use r.mapcalc instead of r.patch. But it
> > > might be better to add an option to r.patch to support this type of
> > > usage.
> > 
> > Would be nice to have that.
> > 
> > And another question: Is it possible to ad something else besides an
> > Aspect map? Use maybe transparencyt and a background command (like with
> > r.digit)? What are the limitations?
> 
> I'm not sure how a background map could work; it would be obscured by
> the map being edited.
> 
> The aspect map feature was only added because it was present in the
> original d.rast.edit module which the script replaces. I have no idea
> what purpose it serves.
> 
-- 
Nikos Alexandris
.
Department of Remote Sensing & Landscape Information Systems
Faculty of Forestry & Environmental Sciences, Albert-Ludwigs-University Freiburg
.
Tel.  +49 (0) 761 203 3697 / Fax.  +49 (0) 761 203 3701 / Skype: Nikos.Alexandris
.
Address: Tennenbacher str. 4, D-79106 Freiburg i. Br., Germany
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