Hi,
I'm about to start implementing a UTFgrid WMS output format based on the
MapBox UTFGrid
specification:
https://github.com/mapbox/utfgrid-spec/blob/master/1.3/utfgrid.md

The output format will be as usual a bit more lax than the spec, we plan to
allow non
square requests too, even if the expectation is that we are going to
receive mostly tiled requests.

Implementation wise we are going to associate each feature to a progressive
number,
use this number as a grayscale color that will be used to paint the feature
in question on the map,
and then turn the resulting gray map into a char map according to the
utfgrid spec ....
which seems simple, but once one takes into account all of our rendering
abilities, well,
it's not going to be so much anymore ;-)

In particular, it's not clear if we are going to be able to work against
rendering transformations,
since they make new features pop up out of thin air, but I'll see what I
can do.

Since output formats are pluggable, it would be possible to implement this
as a community
module, but I expect to only have a handful of classes (style transformers,
image transcoders,
feature collection decorators to add the grayscale ids as a new attribute)
plus some eventual
changes to streaming renderer, so I'm not sure the work is worth its own
module... was more
thinking of adding it directly to the gs-wms module, but would also like to
hear your opinion.

Cheers
Andrea

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