Rick Root wrote:
> 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!
> 
> 

What calculation did you use to limit the longitude?...if you are using 
the same one as latitude, I'm not understanding...
Let's take a latitude around the center of our home state of NC...35 
degrees...
At 35 a degree of longitude is approx 57 miles long
(per http://www.csgnetwork.com/degreelenllavcalc.html)

1 degree longitude/57 miles = .017544
1 degree latitude/69.172 miles = .014457

..014457 < .017544

so you would be limiting too much of the longitude if you are only using 
the .014457 number.  Are you doing something different?  Or do I have it 
all wrong?

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|
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:268884
Subscription: http://www.houseoffusion.com/groups/CF-Talk/subscribe.cfm
Unsubscribe: 
http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=11502.10531.4

Reply via email to