Define physiographic feature

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This seems to be synonymous with "landform"
https://en.wikipedia.org/wiki/Physiographic_regions_of_the_world

But the ref above notes that what are currently listed as hydrographic features 
(after the USGS classification, perhaps?) are also physiographic features. We 
could make "hydrographic feature" a subclass of "physiographic feature".

Original issue reported on code.google.com by p.buttig...@gmail.com on 6 Oct 2013 at 6:40

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Perhaps the hydrographic feature class (and other "[X] feature" classes like 
"undersea feature" or "volcanic feature" [see Issue 84] ) can be removed 
altogether?

These tend to precipitate cases of multiple inheritance. For example, 
"submarine canyon" as a subclass of both "canyon" and "undersea feature". 

Thoughts?

Original comment by p.buttig...@gmail.com on 6 Oct 2013 at 6:53

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Another case: "ocean basin" as a "depression" which is a "physiographic 
feature". Very general topographical classes seem attractive.

Original comment by p.buttig...@gmail.com on 6 Oct 2013 at 6:58

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Also see http://en.wikipedia.org/wiki/Physical_geography

Physiography involves the study of the hydrosphere and atmosphere. Trying to 
separate out concepts like "hydrographic feature" may lead to issues.

Original comment by p.buttig...@gmail.com on 10 Oct 2013 at 8:20

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