Add classification:incomplete #33

[m-mohr]

This PR is based on #32! It adds classification:incoplete and a recommendation to describe a range of values. See #33 for the discussion.

cc @pjhartzell @gadomski

[drwelby]

other synonyms to see how they look:

classification:incomplete
classification:partial
classification:limited

[m-mohr]

I found incomplete more intuitive and self-explanatory, but I'm a non-native speaker so may not get the nuances here.

[drwelby]

incomplete can also mean unfinished but I don't think it's a problem. I just wanted to think about other words now so I don't regret it when I think of the perfect word in two months.

[pjhartzell]

The intent of classification:incomplete is to indicate that only a subset (e.g., multiple no-data) of the data are described in classification:classes?

I don't have a strong opinion on this. It's optional and doesn't break anything, so 👍 .

[m-mohr]

Yes, but it would not be really needed if we settle on ranges for classes. We need to decide for or against ranges at some point :-)

[m-mohr]

Hmm... I'm not entirely sure whether this is the way to go so waiting for further feedback. If no one else needs it, I'd also be fine to close this and use the raster band statistics to indicate incompleteness.