> From: Martin Towell <[EMAIL PROTECTED]>
> I'm currently working on a system that grabs an image from a map server and,
> using html layers, overlays where the products are.
> Basically, this is how it's set up.
> The map server is running on a WinNT system.
> In the html code, I put am image tag that accesses the web server, passing
> the x,y coords (formatted as x meters from some origin) and zoom level (plus
> some other details). I then get the web server to access the map server
> (this is to shield the map server from the outside world) and basically do a
> fpassthru() on the data.
Can you comment on the technology of the map server? Is it a commercial
product or built for your application? I assume it creates the map images --
is that process fast enough for your needs?

> Meanwhile, the html doc has a layer placed over the map image. This layer
> contains another image with just the products on it. I get php to generate
> this second image on the fly by querying the database, filtering out all the
> products that lay outside the image's area, then I plot the points onto the
> image.
> Because there's a lot of other things that are happening on the page (due to
> the client's requirements), when the user wants to zoom or pan the map, I
> use js to update the images.
Are you using JavaScript to update the image without going back to the map
server? If so, does that mean multiple maps are loaded during the
interaction with the map server, then called as needed, or is one image
created by the map server then modified with JavaScript or PHP for different
zoom views and pans?

Thanks, I find your project description very helpful.

Lowell Allen

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