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Pattern in aspect of random raster (aspect algorithm artefact???)

Question asked by on Apr 2, 2014

Have anybody come across periodic pattern in histogram of aspect calculated by ArcGIS?
I calculated aspect of a random float raster and expected that its histogram will be flat. However, I found there are peaks in the histogram corresponding to 45, 135, 225, and 315 degree. Is this an artefact of aspect calculation algorithm in ArcGIS?

Any suggestions?

Thank you