> From: "Lazor, Ed" <[EMAIL PROTECTED]>
> Are you really working with actual map coordinates that include longitude
> and latitude?  
That's what the client *WANTS*, yes. Currently, local sales agents visit
each property and take digital photos. They'd like to give them hand-held
GPS units so they can also record the location of each property. The sales
agents would then enter property information into an online database.

> This seems to be a reverse approach to what I usually see.  From what I've
> seen, you typically display a map of the united states.  Click a state to
> zoom in.  Have the state map divided into sections, click the section to
> zoom.  And just continue having maps divided into sections that the user can
> click to zoom in closer and closer.
> Using coordinates to accomplish this seems possible, but overly complex.
> You'll literally be creating a 3D world and that means you'll end up having
> to create coordinate systems for every single object in the world.  For
> example, say you give coordinates and then have a 5 mile by 5 mile map
> display centering on these coordinates.  Then each house falling within that
> geographic boundry gets displayed on the map.  Obviously, it sounds very
> cool... but incredibly complex.  It's just as easy to use the method I
> described above to zero in on the geographic area and list houses within
> that zone rather than draw pin-points on a map to show where the houses
> reside geographically.  Especially when that geographic representation
> includes things like other houses, streams, schools, etc.
I agree it seems very complex, but it would just require referencing to the
2D world of map coordinates, wouldn't it? If the corners of each rectangular
map view were referenced, couldn't any point be placed in relation to 3 of
the corners?

> My $.10
Thanks for the input. I certainly don't know if the client's desire is
realistic, and I appreciate any guidance and suggestions.

> -----Original Message-----
> From: Lowell Allen [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, July 11, 2002 1:42 PM
> To: PHP
> Subject: [PHP] PHP and geographic maps
> A client wants a database-driven site that records information about real
> estate properties and includes geographic maps of property locations
> (throughout the US). The client has seen a presentation of a
> JavaScript-powered, Windows-only product that doesn't seem to fit well with
> my preference for PHP/MySQL. I've been Google-searching info on GIS and GPS
> and GMT, but thought it might be worthwhile to ask this discussion list for
> input.
> Can anyone direct me to info on PHP presentation of geographic maps -- tied
> to a database with locating coordinates?
> Thanks.
> --
> Lowell Allen
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