From: Daevid Vincent
Date: April 25 2006 9:15pm
Subject: RE: Calculate LONG/LAT from ZIP+4 (positve vs. negative longitude)
List-Archive: http://lists.mysql.com/mysql/197356
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Thanks for the graph. 

So are you saying that I should use the database that has the negative
values, 
and not the one that uses positive values?

I'm in the USA. I don't care about anywhere else (for my location needs that
is).

> -----Original Message-----
> From: Jay Blanchard [mailto:jblanchard@stripped] 
>
> Latitudes and longitudes are often represented based on their location
> relative to the equator and the prime meridian;
> 
>                       |
>              pos lat  | pos lat
>              neg long | pos long
>                       |
>                       |
> ---------------------------------------------------
>                       |
>              neg lat  | neg lat
>              neg long | pos long
>                       |
>                       |
> 
> Sometimes the coordinates are based on positive distances 
> (non-standard lat/long) 
> from the prim meridian and equator, yielding a pai 
> of positive
> numbers for each coordinate that would not be the same 
> numbers as given by the standard system.