Actually, I did a limitation by longitude as well, because at the equator, the fudge factor is the same (approximatley 69 miles per degree)... everything in the US is less than that but I figured what the heck. So I draw the box on both lat and long, knowing that the longitude will actually encompass MORE than the area I'm looking for... the getDistance() function actually does the work of exact distances anyway. As long as the "box" is bigger than necessary, it's all good.
I was thinking it might actually be wise to use a range factor GREATER than 1/69 ... like 2/69...giving the latitude some wiggle room. But thinking about the math involved as to *WHY* I'd do that makes *MY* head hurt! On 2/6/07, Jim Wright <[EMAIL PROTECTED]> wrote: > > Rick Root wrote: > > > > I like how you're limiting by latitude only and using the radius as > well. > > > > Thinking about limiting it by longitude made my head hurt...I thought > about using some larger constant (like the 2 degrees that you used), but > in Alaska, 2 degrees longitude only equates to about 44 miles in some > places. Limiting by latitude at least gets the bulk of the comparisons > out of the way. > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Upgrade to Adobe ColdFusion MX7 Experience Flex 2 & MX7 integration & create powerful cross-platform RIAs http:http://ad.doubleclick.net/clk;56760587;14748456;a?http://www.adobe.com/products/coldfusion/flex2/?sdid=LVNU Archive: http://www.houseoffusion.com/groups/CF-Talk/message.cfm/messageid:268878 Subscription: http://www.houseoffusion.com/groups/CF-Talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4
