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add feature mangling task

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git-svn-id: http://svn.osgeo.org/postgis/trunk@4020 b70326c6-7e19-0410-871a-916f4a2858ee
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Paul Ramsey 2009-04-24 19:13:56 +00:00
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commit 32af67b299
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TODO
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@ -53,6 +53,20 @@ but providing some utility.
Current curve support does include indexing and in/out functions but needs
much better documentation, particularly about the valid WKT and WKB forms.
-- Data Mangling for Performance --
Often geofeatures will be very large, 1000s of vertices, but the use case
for the features will only be using a few vertices at a time. For example,
an ocean polygon could be huge, but if a map is only zoomed into the coastline,
a small portion will be needed. Nonetheless, the database will have to
retrieve the whole feature. Similarly, when carrying out spatial joins,
retrieving very large features and matching against small features is a bad
performance bargain, particularly since large features tend to reside in
the TOAST tables, for yet more performance pain.
The solution is to cut up the large features into smaller features.
Some standard utilities for doing so are required.
-- Geodetic support --
A new "geography" type which is indexed in cartesian 3-space, possibly