Generate line work from aerial imagery

This is just a brainstorming post, in hope some one might have an idea to guide me on this!
I want to generate line work from an aerial image. I feel like it can be done, but every time I try, Civil 3D crashes on me.
My intended workflow is to:

  • Read in the image
  • Get the pixel colors
  • Create dynamo points with the same array as the pixels
  • Create a new list of the point and respective colors
  • Create surfaces of the points within a close color range
  • Get the topology edges

Whenever I have an excessive number of points it crashes though! But I need a high number of points to accurately depict different terrain colors and features.

Any thoughts are greatly appreciated. Thanks

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