I need to extract beaver channels from a GeoEye image (attached image). What is the best approach to automatically delineate such very narrow and not very sharp water features?enter image description here

  • Very broad question, but have you tried edge-detection filters? – Mikkel Lydholm Rasmussen Oct 14 '15 at 8:42
  • I am not very familiar with edge detection. Which filters to use? Can I find them in such programs like Arcgis, Erdas or ENVI? – Zoya Oct 14 '15 at 10:26
  • ENVI has some tools. Try the Sobel Edge Detection in the Filter -> Convolutions and Morphology tool. See exelisvis.com/docs/DetectEdges.html for more info. – Mikkel Lydholm Rasmussen Oct 14 '15 at 10:31

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