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Guillaume:
Shaddow casting, particularly over small plot forest cuts (subsistence
farmed areas) surrounded by tall canopy, and via hill shading, do pose a
major problem and must be counteracted or accounted for.
You may want to read through Frederick Portigal's work posted in a paper on
"Rio Platano Biosphere Intrusion Analysis Using Hyperspectral Linear Mixing
Models, La Mosquita, Honduras" for clues and methodology, at his website
(this paper was first published in 1996 at the 26th International Symposium
on Remote Sensing of Environment, in Vancouver, British Columbia). This is
not a deciduous situation, but tropical canopy, though the technique is the
same...
http://www.ultraspectral.com
All the best,
Derek Parent
Concordia University
Department of Geography
Montreal, Canada
----- Original Message -----
From: "Guillaume Larocque" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, October 25, 2000 9:36 AM
Subject: Idrisi-L : Shadows and deciduous forests
> --- Start of Idrisi List message
> Hello,
>
> I am a university student working on a project involving remote sensing of
> deciduous forests. A graduate student and myself have encountered a
problem
> while analysing images of the forest areas and have not been successful in
> finding a solution within our immediate resources.
> On remote sensing images acquired with a 1 meter resolution hyperspectral
> sensor, individual trees cast shadows on the nearby canopy, which hinders
> the classification of the image. We have yet to find a way to "remove"
> shadows from the images.
>
> Did anyone come across similar problem? Any solution that could be
> implemented in Idrisi?
>
> Here's hoping that you can help us,
>
> Gratefully yours,
>
> Marie Ducharme
>
> P.S. I will summarize.
>
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