Frank Warmerdam wrote:
Jeff Hoffmann wrote:
I'm trying to use the COLORRANGE feature to display DEM data, but I'm
not getting any output from what I'm doing now. I have a tif with one
band (the elevation) and I'm trying to first split that band into
different classes for elevation ranges then I want to use a color ramp
within each class to get a smooth blue->green->yellow->red sort of
transition. The first split into classes seems to work -- I can
assign each class a solid color and I'll see that, I just can't get
the color ramp to work within the class. Here's one of my class
definitions:
CLASS
EXPRESSION ([pixel] >= 500 AND [pixel] < 1000)
STYLE
COLORRANGE 48 255 180 255 255 0
DATARANGE 500 1000
RANGEITEM "[pixel]"
END
END
Does anybody know what's going wrong here?
Jeff,
Excellent idea, but unfortunately the raster colorrange support only
works with one class, and a single color range. This is a limitation
of the implementation.
Thanks for the confirmation, Frank. I'm kind of disappointed that this
won't work, but I've found a couple of simple little utility programs
that will let me pre-process the TIFFs into the color-shaded output I
wanted. If anybody else is interested, they're located at
http://www.perrygeo.net/wordpress/?p=7 Overlaying a hillshaded version
at ~40% opacity on top of the color ramp make for some really nice
looking images with almost no work involved.
--
Jeff Hoffmann
Head Plate Spinner
PropertyKey.com
