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Posted by Edward Winters on April 25, 2004, 7:39 am
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Hello,
I am trying to determine how one would build a system with the following
requirements:
* Perform a distance calculation between two US addresses.
* Perform geocoding operations as needed to accomplish distance
calculations.
As far as how the system will geocode addresses, I'm looking at:
* Address Interpolation where geocode of address is calculated by guessing
an address's location on a street segment, where the geocodes of the
segment end points are already known.
* Taking an address with five digit ZIP Code, and figuring out the ZIP+4
for the address. I'm assuming the ZIP+4 centroid then gives a pretty good
approximation of lat/long.
* When all else fails, use five digit ZIP centroid (could be really
inaccurate)
Questions
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1) I am having trouble locating the data necessary to perform the above
operations. I'm hoping that the data is available through a public source,
but understand that may not be the case. Can someone point me in the right
direction on obtaining this data? (Including street segment with address
ranges geocodes, five digit ZIP centroid, ZIP+2 centroid, ZIP+4 centroid)
2) If I knew the five digit ZIP code of an address, how could I figure out
the ZIP+4 information?
Thanks in advance for any help,
--
Edward Winters
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