how to get slope in x and y directions

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01-14-2011 12:07 AM
TaiseerHarb
New Contributor
Dear All,

How can I be able to generate the slope of a raster file (dem). I need here two types of slopes: the slope in the x-direction, and the slope in the y-direction of the same dem raster file.

Thanks
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2 Replies
curtvprice
MVP Esteemed Contributor
Seems to me the best approach would be calculate aspect and slope, and then build a map algebra expression (using basic sin/cos trigonometry) to separate the slope in to X and Y components using the aspect.

I would be very careful as to which coordinate system you use so the X and Y will "make sense" (for example so "north" will be "up").

Does this help?
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DanPatterson_Retired
MVP Emeritus
An excellent discussion on slope issues was recently posted by Bill Huber in this thread
http://forums.arcgis.com/threads/20607-Need-help-with-slope-algorithms-for-my-internship
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