[postgis-users] Line segment and its variation over space

[Shaozhong SHI]

3D Line segments can be used for delineating riverine systems.  In nature,
some rivers run in steep gradients and others in flat areas.

In geocomputation, rules are needed in order to compute lines running in
steep gradients and lines in flat areas.

Surely, there are ways to make computed decision on which lines running in
flat areas.

How to devise and implement such rules is of interest.

Any enlightening recommendations and suggestions?

Regards,

David
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