[mapserver-users] Re: Dynamic data loading using Google maps andMapserver

[Varun saraf]

Hi,

Thanks a lot Jim and Steve. These are great examples but I am dividing
each state of USA into about 1300 polygons and I need a way to find
which polygon is selected by the user. I tried building Gpolygons
using the polygon data that i have (after converting it into a GML
file) but it makes Google damn slow to redraw the polygons on zoom in
and zoom out. The tile mode in mapserver is much faster.

Now, After I draw the polygon in tile mode using mapserver, Is there a
way Mapserver can return to me the specific polygon info (say
co-ordinates or any other data in the dbf file relating to that
polygon) when I select it on google map? Goggle I believe can give me
the exact co-ordinates of the point I clicked. Can mapserver use this
point location to find which polygon was selected?

Thanks,
Varun

2009/5/2 Jim Strevinas <voas_acc at hotmail.com>:
> A beautiful example that uses the Google Maps API is:
>
> http://www.dyasdesigns.com/geoxml/gmlusa.htm
>
> It makes use of an API plugin called geoxml that can load XML data which can
> be produced by
> a WFS server. In the source code, a static GML file is used but a google
> search shows that it can
> connect to a live WFS server using the URL.
>
>> Date: Sat, 2 May 2009 09:28:01 -0500
>> From: Steve.Lime at dnr.state.mn.us
>> To: vsaraf.gmu at gmail.com
>> Subject: Re: [mapserver-users] Re: Dynamic data loading using Google maps
>> andMapserver
>> CC: mapserver-users at lists.osgeo.org
>>
>> One way to do that is to construct MapServer queries based on the event
>> and submit them using AJAX. This site does just that but with OpenLayers:
>>
>> http://www.dnr.state.mn.us/waters/csg/index_copy.html
>>
>> Click on the dots and a MapServer query is done behind the scenes. If
>> successful
>> a little window control is populated, if not, then nothing happens. Simple
>> templates
>> are used to present the information.
>>
>> Steve
>>
>> >>> Varun saraf <vsaraf.gmu at gmail.com> 05/01/09 11:54 AM >>>
>> Hi,
>>
>> I just had a look at ImageMap Template on "Output generation"...Can
>> this be used on google maps to get information pooped up on a
>> mouseover or mouseclick in tile mode? If not, what is it that I can do
>> to get a similar result when using Mapserver with google maps?
>>
>> Regards,
>> Varun
>>
>> On Thu, Apr 30, 2009 at 6:30 PM, Varun saraf <vsaraf.gmu at gmail.com> wrote:
>> > Hi,
>> >
>> > I have successfully drawn layers on of google maps as base using
>> > mapserver. However, I am trying to figure out how to get data
>> > dynamically displayed on the web page when a user clicks on a certain
>> > area. For example, I have divided the entire state of virginia into
>> > many sectors (using a polygon shp file). My requirement is that I want
>> > data to come up on the map/web page when the user selects a particular
>> > sector. I know google provides me with an event api for clicking on
>> > the map but how do I pass this event to mapserver so it can send me
>> > the label for that sector from the shape file? I need to be able to
>> > recognize what sector the user has clicked. Is this possible using
>> > just the mapserv cgi script and a map file or a MapScript has to be
>> > written/used? Can someone point me in the right direction here? Even
>> > providing the link for a previous discussion on this topic would help.
>> >
>> > Thanks,
>> > Varun
>> >
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