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I am a little desperate to find a solution to my problem. As I have detailed in this post I am unable to create a detailed drainage network (and catchments) from high resolution LiDAR data.

I think I narrowed down the issue to the use of integer raster vs floating point raster as the input for my analysis.

Both methods yiled dramatically different results, both methods are unasable for a detailed model. Using an integer raster as input yield a very generalized stream network and using a floating point raster yield a detailed, very disconnected and clustered stream network.

Which type of raster should I be using for input and why?

Current method:

  1. convert to integer raster
  2. fill sinks
  3. flow direction
  4. flow accumulation
  5. stream network /stream links
  6. stream order
  7. watersheds (stream link input)
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merged by whuber May 4 '11 at 20:28

this question was merged with Methodology for creating accurate drainage networks (and catchments) from high resolution LiDAR DEM? because it is an exact duplicate of that question.