[mapserver-users] Re: Dynamic data loading using Google maps
andMapserver
Varun saraf
vsaraf.gmu at gmail.com
Thu May 7 14:15:42 EDT 2009
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.Lime at 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
> <6db14d250905071027j7ff0aac8j30edeb7f8c9389e3 at mail.gmail.com>, Varun saraf
> <vsaraf.gmu at 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.gmu at 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.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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