[mapserver-users] Finding the centroid given the feature

[Varun saraf]

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 <Steve.Lime at dnr.state.mn.us> wrote:
> What version are you using? What data source?
>
> Steve
>
>>>> On 5/28/2009 at 10:01 AM, in message
> <6db14d250905280801q3660a6a7ycbcd5f5a238c595c at mail.gmail.com>, Varun saraf
> <vsaraf.gmu at gmail.com> 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
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>
>