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

[Varun saraf]

Hi Steve,

If I provide Mapserver with a point x,y in WGS84 projection (from
google maps) as a query, can mapserver give me the enclosing polygon
information (using point-in-polygon method or something else)? If yes,
how? I have already drawn the polygons on google map using tile mode.
Can you suggest me a book/doc that helps with querying mapserver?

Thanks,
Varun

On Sun, May 3, 2009 at 9:56 AM, Steve Lime <Steve.Lime at dnr.state.mn.us> wrote:
> Both examples show how to do this. You have to create a query using
> the coordinate from Google to access MapServer. My example uses the
> principle to query points but would work for polygons (which are actually
> easier). You could issue straight MapServer queries:
>
>  http://.../cgi-bin/mapserv?mode=query&map=something.map&mapxy=google_x+google_y&qlayer=the_polygons
>
> or do a WFS query. Since you're already using straight MapServer the former
> would probably be easiest.
>
> Steve
>
>>>> Varun saraf <vsaraf.gmu at gmail.com> 05/02/09 1:34 PM >>>
> 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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