NYCPHP Meetup

[nycphp-talk] Deconstructing google maps

Rolan Yang rolan at omnistep.com
Tue Apr 5 13:06:38 EDT 2005


Jay, 

 Thanks for that link! I've used zipcode databases for clients before, 
but none were public domain. It will come in handy and also cut down on 
future costs. I've been looking into the google maps interface lately. 
It's pretty sexy. I've decoded the scheme they use to map image blocks 
to lat/lon coordinates. Here's a simple interface:

http://www.datawhorehouse.com/gps2/
source can be viwed at
http://www.datawhorehouse.com/gps2/index.phps

It's interesting to note that Google's function uses 39.50N 98.35W as 
the center point whereas the actual center of the continental US is at 
39°50'N 98°35'W   ... a conversion error!

I'll have to figure out how they do that fancy dhtml/javascript 
scrolling next. Anyway, check it out, and if you make any improvements, 
shoot me back an email.

~Rolan







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