Make sure with polygon data to explicitly set TOLERANCE 0 in the layer definition to make sure the point is in the polygon.
Steve >>> On 5/7/2009 at 1:15 PM, in message <[email protected]>, Varun saraf <[email protected]> wrote: > 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 <[email protected]> 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 >> <[email protected]>, Varun saraf >> <[email protected]> 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 <[email protected]> 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 <[email protected]> >>>> 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 <[email protected]> 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 <[email protected]>: >>>>>> 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: [email protected] >>>>>>> To: [email protected] >>>>>>> Subject: Re: [mapserver-users] Re: Dynamic data loading using Google >>>>>>> maps >>>>>>> andMapserver >>>>>>> CC: [email protected] >>>>>>> >>>>>>> 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 <[email protected]> 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 <[email protected]> >>>>>>> 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 >>>>>>> [email protected] >>>>>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users >>>>>>> >>>>>>> _______________________________________________ >>>>>>> mapserver-users mailing list >>>>>>> [email protected] >>>>>>> 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 >>>>>> [email protected] >>>>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users >>>>>> >>>>>> >>>>> _______________________________________________ >>>>> mapserver-users mailing list >>>>> [email protected] >>>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users >>>>> >>>>> >>>> >>> _______________________________________________ >>> mapserver-users mailing list >>> [email protected] >>> http://lists.osgeo.org/mailman/listinfo/mapserver-users >> _______________________________________________ mapserver-users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/mapserver-users
