[postgis] Line Thinning

[Paul Ramsey]

I'd just like to quickly point out that Line Thinning on the fly, while
not a bad thing, is a bit of a red herring in the pond. No matter how
aggressively or inteligently you thin, if your result set consists of 2
million records, you will not be getting interactive performance from
your database anymore.

Probably an intelligent browsing client, when told to 'look at that
spatial database' would do a quick (or not so quick) 'select count(*)'
from each spatial table, and a 'select extent(*)' from each spatial
table, then cache those results as a first order approximation of how
much data it is dealing with in each table. From there it could make
some smart choices about what to display/not display when zoomed to
'full extents'.

When such a thing exists, that is :)

P.

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