yes my data is in lat, long. I discovered the inverse lat long in mapxy just after sending this email and tried it. It works now but the New problem is that the result is a little tweaked. I guess its a problem with the projection. The tract number is not the current one when I click somewhere on the border of a tract. The projection is not that big a problem for me right now. I need to get this thing up and running by EOD with google maps (The dynamic clicking on the map etc).
Thanks a lot for the prompt reply. On Thu, May 7, 2009 at 1:32 PM, Steve Lime <steve.l...@dnr.state.mn.us> wrote: > Something's backwards, you're mapxy is 38.87795, -77.098617 but your extents > are neg,pos,neg,pos? Also > is your data in lat/lon? > > Steve > >>>> On 5/7/2009 at 12:27 PM, in message > <6db14d250905071027j7ff0aac8j30edeb7f8c938...@mail.gmail.com>, Varun saraf > <vsaraf....@gmail.com> wrote: >> Hi All, >> >> I am trying to integrate the census tracts on the google maps base. I >> am using the tile mode and have successfully drawn the shape files >> over the states of USA. I have some data in an access database that I >> need to show to the user when he selects a particular census tract >> (the shapes are polygons). However, since its a tile mode that I am >> using on google maps, I am unable to understand how do I get the >> information from mapserver as to which census tract was selected by >> the user? Is there a way mapserver can send me the polygon selected >> based on a co-ordinate lying inside the polygon? I know there is a way >> by using queries and a querymap for doing this. The query that I am >> using is as follows >> >> http://127.0.0.1:8123/cgi-bin/mapserv.exe?&map=C:/ms4w/apps/census/testMap.map& >> mode=query&mapxy=38.87795 >> -77.098617 >> >> I am providing a template in my map file that has the tract variables. >> However, the result is always the same >> >> "msQueryByPoint(): Search returned no results. No matching record(s) >> found." Is it that mapserver is trying to look for a point feature in >> the location specifies by mapxy in the link above? How do I make >> mapserver to look for a polygon enclosing this co-ordinate and return >> me the result? I am attaching my mapfile also for reference. >> >> MAP >> NAME testMap >> STATUS ON >> SIZE 600 300 >> EXTENT -84 37 -75 40 >> UNITS DD >> SHAPEPATH "data" >> IMAGECOLOR 255 255 255 >> CONFIG "MS_ERRORFILE" "ms_error.txt" >> >> IMAGETYPE PNG >> >> WEB >> IMAGEPATH "/ms4w/tmp/ms_tmp/" >> IMAGEURL "/ms_tmp/" >> END >> >> QUERYMAP >> STATUS ON >> STYLE HILITE >> END >> >> LAYER >> NAME "virginia" >> STATUS DEFAULT >> TYPE polygon >> DATA tr51_d00 >> DEBUG 5 >> TOLERANCE 1000 >> TOLERANCEUNITS pixels >> >> TEMPLATE "bodytemplate.html" >> HEADER "imapheader.html" >> FOOTER "imapfooter.html" >> >> CLASS >> STYLE >> OUTLINECOLOR 128 128 128 >> COLOR 153 205 255 >> END >> TEMPLATE "pointTemplate.html" >> END >> >> END >> END >> >> Thanks, >> Varun >> >> On Mon, May 4, 2009 at 3:30 PM, Varun saraf <vsaraf....@gmail.com> wrote: >>> 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.l...@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....@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_...@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.l...@dnr.state.mn.us >>>>>> To: vsaraf....@gmail.com >>>>>> Subject: Re: [mapserver-users] Re: Dynamic data loading using Google maps >>>>>> andMapserver >>>>>> CC: mapserver-users@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....@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....@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 >>>>>> > >>>>>> _______________________________________________ >>>>>> mapserver-users mailing list >>>>>> mapserver-users@lists.osgeo.org >>>>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users >>>>>> >>>>>> _______________________________________________ >>>>>> mapserver-users mailing list >>>>>> mapserver-users@lists.osgeo.org >>>>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users >>>>> >>>>> ________________________________ >>>>> Invite your mail contacts to join your friends list with Windows Live >>>>> Spaces. It's easy! Try it! >>>>> _______________________________________________ >>>>> mapserver-users mailing list >>>>> mapserver-users@lists.osgeo.org >>>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users >>>>> >>>>> >>>> _______________________________________________ >>>> mapserver-users mailing list >>>> mapserver-users@lists.osgeo.org >>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users >>>> >>>> >>> >> _______________________________________________ >> mapserver-users mailing list >> mapserver-users@lists.osgeo.org >> http://lists.osgeo.org/mailman/listinfo/mapserver-users > _______________________________________________ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users