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

Question asked by thao.tm.nguyen on Apr 2, 2014
Hi,

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

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