Matthias Basler a écrit :
I noticed several times already the idea of a "Coverage = Feature" being
discussed in GeoTools. I don't know if this idea is proposed in GeoAPI,
It is part of ISO 19123 specification. Quoting the introduction:
"In this International Standard, coverage is a subtype of feature.
A coverage is a feature that has multiple values for each attribute
type, where each direct position within the geometric representation
of the feature has a single value for each attribute type."
The first sentence is easy to understand, but I admit that I have a lot
of trouble to understand what the second sentence means. Anyway, ISO
19123 seems pretty vague (at least to me) about what a feature is, so
maybe we have some degree of freedom there. But the spirit seems close
to yours proposal.
In my opinion a GridCoverage should be seen as a FeatureCollection:
GridCoverage = FeatureCollection
^ ^
v v
| |
Pixels = Polygon Features/Point Features
[...snip...]
What's your opinion?
It seems to me that you proposal may actually be close to what ISO 19123
said :). But given that I really have a lot of trouble to understand
what the GridCoverage vs Feature relationship is according ISO 19123,
I'm not sure. Maybe the question depends on whatever a FeatureCollection
is a Feature or not (I believe that the Feature experts had some debate
on this topic recently?)
Martin.
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