currently we use FilterFactory2.dwithin(geo1, point, distance, units) to
lookup the features within a radius of "distance" from "point"
but the features in the collection are represented using lat-long,
so if FilterFactory2 treats them just as a flat 2-D coordinate system, the
distance computed at higher latitude is going to be higher than
real distance. so the above lookup actually looks up not a circle, but an
ellipse.
it seems that to do a real circle lookup, we need dwithin to accept a
function as parameter, instead of distance. right? but given the current
geotools code, is there a way to achieve circle lookup?
Thanks
Yang
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