new/ updated classes: glaciers, glacial ice & erosionally enriched ice

[kaiiam]

Hey @pbuttigieg we previously dicussed here and here the need for the term glacial ice.

we currently have glacier defined as:

A large, slow moving river of ice, formed from compacted layers of snow, that slowly deforms and flows in response to gravity.

we discussed changing glacier's definition to:

An ice mass which is of sufficient mass that the action of gravity upon it overcomes the frictional forces holding it in place, causing it to deform and flow towards lower elevation.

As we previously discussed glacial ice could be defined

Any water ice that is part of a glacier.

As subset of glacial ice or subset of ice with some sort of link to glacier we could add 'erosionally enriched glacial ice'

Any glacial ice which contains material liberated during a glacial erosion process.

Where 'glacial erosion process' can be defined as

An erosion process during which the movement of a glacier across a terrestrial surface causes the removal of material from that surface.

[pbuttigieg]

Yes, this looks actionable right now. We may need to think about how to structure the erosional processes and the materials they generate:
Ice <-is- erosionally enriched ice <-is- erosionally enriched glacial ice

The issue is that this can explode the number of process-enriched, feature located terms. We'll see where it goes, but keep that in mind.

[kaiiam]

ok @pbuttigieg I've revamped definition for glacier, added glacial ice as subclass of ice mass, added erosionally enriched glacial ice as subclass of ice mass (under geographic feature).

We still have the issue of the ice mass hierarchy occurring in duplicate once under geographic feature and once as ice mass independently, both of which are subclasses of environmental feature. We should address this, thoughts?

Finally I added glacial erosion process as subclass of erosion.

[pbuttigieg]

Hi @kaiiam

added glacial ice as subclass of ice mass, added erosionally enriched glacial ice as subclass of ice mass (under geographic feature).

The new terms should be in the material hierarchy, not the feature hierarchy. You have some glacial ice, not a glacial ice: if it's not countable (a lake, a building, etc) but more a mass or a volume (some water, some ice, etc.) it should be in the material hierarchy.

If you created classes like glacial ice mass = ice mass and composed_primarily_of some glacial ice, you could put those in the feature hierarchy.

We still have the issue of the ice mass hierarchy occurring in duplicate once under geographic feature and once as ice mass independently, both of which are subclasses of environmental feature. We should address this, thoughts?

We'll do this later today before you send in the PR.

Finally I added glacial erosion process as subclass of erosion.

Great!

[kaiiam]

Agreed @pbuttigieg, lets sort this out together later today when we do the PR.

[kaiiam]

@pbuttigieg, we finished this during pull request 2 for project cryophile #481