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imshade

30 Oct 2009 (Updated 03 Nov 2009)

Plot shaded relief, optionally using simulated lighting direction

File Information
Description	IMSHADE will plot a matrix representing topography as a 3-component color image, with intensity proportional to the magnitude of the topographic slope of each pixel. Optionally, it can take an argument for lighting angle to use the directional slope. The current colormap will be used, but future changes in the colormap will not alter the image, since it is now displayed as RGB derived from the colormap and shading. Nondirectional shading usually scales well, though it is not very robust to spikes in the topographic gradient. The normalization used for directional shading does not always yield satisfactory results and may benefit from some tweaking. Attached screenshot shows a seamount plotted with IMAGESC (no shaded relief) and with IMSHADE.
MATLAB release	MATLAB 7.7 (R2008b)
Zip File Content
Other Files	imshade.m, license.txt

Tags for This File
Everyone's Tags	color, earth science, map, mapping
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Comments and Ratings (1)
02 Nov 2009	Gary	"IMSHADE will plot a matrix representing topography as a 3-component color image, with intensity proportional to the magnitude of the topographic slope of each pixel. Optionally, it can take an argument for lighting angle to use the directional slope." In this case, a picture is worth a thousand words. You should include an example output, as many other File Exchange submissions have done.

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Updates
03 Nov 2009	Add a screenshot
03 Nov 2009	Attach corrected screenshot (previous version had incorrect latitude and longitude labels)

Tag Activity for this File
Tag	Applied By	Date/Time
map	Kelsey Jordahl	30 Oct 2009 13:17:44
mapping	Kelsey Jordahl	30 Oct 2009 13:17:44
color	Kelsey Jordahl	30 Oct 2009 13:17:44
earth science	Kelsey Jordahl	30 Oct 2009 13:17:44

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