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I am trying to calculate the steepness of each pixels (30m) from the DEM of 2m resolution. I have made use of ERDAS Imagine - Slope function and returns a contour-like pixel image. The pixel value between contour is null in value. I have also tried to resample the slope image to 30m pixel but i don't know why many pixels return null value even it is overlapped with lots of contour-like pixels.enter image description here

Are there any method to calculate the steepness of each pixels in the DEM? What i want to do is to make use of DEM to filter the flat area in the image classification.

Many thanks for your help. Jimmy

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Have you though of just using the free GDAL tool?

http://www.gdal.org/gdaldem.html

It can run in windows using OSGEO4W and can ouput .img files.

For Imagine 8 it goes something like...

From Spatial Modeler: This model is found in the file <.IMAGINE_HOME.>/etc/models/Slope_percent.gmd.

From Image Interpreter: Select Topographic Analysis... | Slope.... Under Output units select degrees / percent or similar. To view or edit the model, click the View... button in the Surface Slope dialog.

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IMAGINE's standard Slope operator or functionality uses a raster image with elevation as the pixel value. (Is your input like that, or what explains the Contour line -like image?)

http://community.hexagongeospatial.com/t5/Spatial-Recipes/Quadratic-Method-for-Slope/ta-p/1913 includes an alternative Slope method.

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