Thanks a lot Steve. I am able to use the itemquery to fetch the other attributes correctly but somehow, the center of polygon isn't working right. Its returning to me, the co-ordinates that are outside the bounds of the mapping application. All my data is in the actual geographic co-ordinate system followed by Google maps and it returns a latitude/longitude pair corresponsing to some place in Antarctica. Any idea on what might be wrong?
On Tue, Jun 2, 2009 at 1:50 PM, Steve Lime <[email protected]> wrote: > Yes, you'd need to create a template for that. You could return JSON, XML, > csv or whatever. This would > be the most straightfoward using 5.2 or ideally 5.4.1 (due out today) and the > new style templates. You > could create a template output format to use like so: > > OUTPUTFORMAT > NAME 'geom_center' > DRIVER 'TEMPLATE' > MIMETYPE 'text/plain' > FORMATOPTION 'FILE=geom_center.tmpl' > END > > where geom_center.tmpl might look like: > > <!-- MapServer Template --> > [shpmidx],[shpmidy] > > and your query would look like: > > http://.../cgi-bin/mapserv?map=foo.map&...itemquery > stuff...&qformat=geom_center > > Steve > >>>> On 6/2/2009 at 12:17 PM, in message > <[email protected]>, Varun saraf > <[email protected]> wrote: >> Center of the geometry works perfect. I need to get access to any >> point inside the polygon feature. I believe I can use an itemQuery on >> mapserver to query the attribute but how does mapserver return the >> center point? Do I need to create an HTML template for that too? >> >> On Mon, Jun 1, 2009 at 4:11 PM, Steve Lime <[email protected]> >> wrote: >>> MapServer templates can produce a center point for a geometry but it's not a >> true centroid but those >>> aren't guaranteed to be "in" the polygon. MapScript could be used as well I >> suppose. In either case you'd >>> send a lookup request to the CGI or MapScript, do an attribute query and >> return whatever you'd need. >>> >>> Steve >>> >>>>>> On 5/29/2009 at 9:32 AM, in message >>> <[email protected]>, Varun saraf >>> <[email protected]> wrote: >>>> I am using mapserver 5.0 with google maps and the data source is the >>>> US Census tracts as shape files and dbf files. >>>> >>>> On Thu, May 28, 2009 at 2:12 PM, Steve Lime <[email protected]> >>>> wrote: >>>>> What version are you using? What data source? >>>>> >>>>> Steve >>>>> >>>>>>>> On 5/28/2009 at 10:01 AM, in message >>>>> <[email protected]>, Varun saraf >>>>> <[email protected]> wrote: >>>>>> Hi, >>>>>> >>>>>> I know mapserver uses a point-in-polygon method to find a feature >>>>>> given a set of co-ordinates, but can it do the same thing reversed? >>>>>> For example. Each polygon I draw has a number associated with it which >>>>>> is in a "dbf" file with the same name as the "shp" file that mapserver >>>>>> uses to draw the polygons. My current map file allows me to fetch that >>>>>> unique number whenever I pass the co-ordinates of any point inside >>>>>> that polygon (mapserver uses the point-in-polygon method to fetch me >>>>>> the polygonID). The query I use is >>>>>> >>>>>> http://127.0.0.1:8123/cgi-bin/mapserv.exe?&map=C:/ms4w/apps/workshop-5.0/testMa >>>>>> p.map&mode=query&mapxy=-77.098617 >>>>>> 38.87795 >>>>>> >>>>>> where mapxy keeps changing based on the user's click. The html >>>>>> template I send just has the variable name [polygonID] which helps me >>>>>> get the polygon ID of the point I specify in the mapxy variable. Now, >>>>>> is there a way in which I can send this polygonID to mapserver and get >>>>>> hold of any point (perhaps the centroid) inside of this polygon? Can >>>>>> someone point me in the right direction here? >>>>>> >>>>>> Thanks a lot. >>>>>> >>>>>> -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 >>> >>> >> _______________________________________________ >> 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
