--- Start of Idrisi List message
I don't usually copy responses to the entire list, but I think this question
is of significant interest that such a response is warranted.
This can be done very easily. The module is called ILLUMINATE -- it is under
the DISPLAY menu. It will ask for the name of a hue/saturation image. This
needs to be a byte binary image that can be displayed directly with a 256
color palette. In your case, this would be the probability map. You might,
for example, want to use STRETCH to classify it into 10-20 classes and
create a suitable palette with SYMBOL WORKSHOP. It will also ask for the
palette to be used (e.g., the special one you have created). In addition, it
will need the name of the DEM that is used as the basis for the shading. You
can, if you wish, use a copy of the probability map (there is no need to
classify it -- it can contain the raw probabilities) if you do not have an
independent DEM. Illuminate will then calculate the shading required and
merge it with the color of the image. I would suggest that you do not choose
the "drape" option since you can always to that later using ORTHO. By the
way, to display a legend, display the illuminated image (which is in 24-bit)
and then add the original layer as a second layer. Then click visibility of
the original layer off, but select it as the basis for a legend.
Briefly, here is what illuminate does:
1. Based on the original image and its palette, it creates three color
separates (using SEPARATE) -- Red, Green and Blue (RGB).
2. It then transforms the RGB to HLS -- hue, lightness and saturation (using
COLSPACE).
3. It then calculates the hillshading (using SURFACE).
4. It then replaces the lightness band of the HLS set with the hillshading
and converts it bach to RGB (using COLSPACE).
5. It then creates a 24-bit composite using COMPOSITE.
Good luck.
Ron Eastman
-----Original Message-----
From: Dawn Browning [mailto:[EMAIL PROTECTED]]
Sent: Sunday, August 20, 2000 10:15 AM
To: [EMAIL PROTECTED]
Subject: Idrisi-L : merging hillshade layer with prob. surface
--- Start of Idrisi List message
Hello everyone,
I had developed a habitat model that produces a probability surface as
final output and I would like to display the result in 3D. I saw a
similar map on the Image Gallery of the ClarkLabs website; it said that
the fire risk layer was merged with the hillshade layer to produce the
result. How exactly would one go about "merging" the two raster layers?
Thanks for your time.
dawn
--- End of Idrisi List message
IDRISI-L is an unmoderated list. As a service to list users, please post a
summary of useful responses to your questions.
To post a message to IDRISI-L, send it to [EMAIL PROTECTED] To
subscribe to the list, send an email from the address to be subscribed to
[EMAIL PROTECTED] with "subscribe" (without quotes) as the first line
of the message body. To unsubscribe, do the same, only with "unsubscribe"
as the first line of the message body.
--- End of Idrisi List message
IDRISI-L is an unmoderated list. As a service to list users, please post a
summary of useful responses to your questions.
To post a message to IDRISI-L, send it to [EMAIL PROTECTED] To
subscribe to the list, send an email from the address to be subscribed to
[EMAIL PROTECTED] with "subscribe" (without quotes) as the first line
of the message body. To unsubscribe, do the same, only with "unsubscribe"
as the first line of the message body.
