Your approach, while sounding feasible, simply wouldn't work except
for a very low number of polygons, maybe four of five at a time. Some
ZCTA's contain thousands of points and hundreds of polygons. Here are
the top 10 ZCTA's for each points and number of geometries:
Points:
points | geometries | zcta5
--------+------------------+---------
94104 | 41 | 99615
68356 | 74 | 99835
57207 | 41 | 34114
48155 | 42 | 28516
46228 | 25 | 99833
43527 | 181 | 34429
39864 | 11 | 84533
37829 | 174 | 59230
37713 | 29 | 99929
36784 | 1 | 21601
Geometries:
points | geometries | zcta5
---------+------+---------
32009 | 360 | 70377
23531 | 354 | 23310
9387 | 270 | 68601
23586 | 254 | 32625
25427 | 236 | 33040
43527 | 181 | 34429
37829 | 174 | 59230
20335 | 168 | 04462
14329 | 153 | 33922
26516 | 152 | 33042
So you can see by these statistics, using anything but a tile layer
would be pointless.
-John Coryat
http://maps.huge.info
http://www.usnaviguide.com
http://www.zipmaps.net
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