[Geomoose-users] Identify Attributes on a WMS
Brent Fraser
bfraser at geoanalytic.com
Thu Jun 17 12:14:35 EDT 2010
Brian Fischer wrote:
> Two quick observation. It looks like GeoMOOSE (identify.php) is sending
> the correct X and Y parameters coordinates 50 and 50. It could be
> possible that there is not feature at exactly that pixel coordinate.
> I’m not sure how WMS specs handle tolerance on those coordinates.
>
I think this is the fundamental problem. If a user is zoomed out and clicks
a point, in pixels it may be "close" to the feature (at that scale), but not in
projected coordinates. identify.php currently takes the location in projected
coordinates and constructs a 100m (?!) radius BBOX, and submits the request.
It should construct a 100 pixel box, calculate the BBOX (using the current
image extent and size for the pixel size), and send that. It should work for
any scale (including an unprojected coordinate system (yuck!)).
And allow for text/xml.
Brent
>
>
> The other thing I noticed is it is not sending it a valid INFO_FORMAT
> parameter value. It is sending it a request of GML. That would be more
> of a WFS format. A better format for GetFeatureInfo would be text/xml.
> Take a look at this web page for valid request parameters.
> http://webhelp.esri.com/arcims/9.2/general/mergedProjects/wms_connect/wms_connector/get_featureinfo.htm
>
>
>
>
> Bottom line is if this is what GeoMOOSE identify.php is sending as the
> WMS GetFeatureInfo request it appears to be wrong and in my opinion is
> likely a bug that would need to be fixed in identify.php code.
>
>
>
> Hope this helps.
>
>
>
> *Brian Fischer,* CFM GIS Project Manager
> *Houston Engineering, Inc.*
> Phone: Direct: 763-493-6664 / W: 763.493.4522 / M: 763.229.2734
>
>
>
> *From:* Miller, Elizabeth (DOT) [mailto:Elizabeth.Miller at state.mn.us]
> *Sent:* Thursday, June 17, 2010 9:56 AM
> *To:* Brian Fischer; geomoose-users at lists.sourceforge.net
> *Subject:* RE: Identify Attributes on a WMS
>
>
>
> So, I’ve been working on this for a couple months now – still no luck!
> I’ve stopped using a mapfile and I now have my wms only as a source in
> my mapbook file. I am hitting the wms on the map with the identify tool
> and I am trying to get the identify.php to send the proper
> GetFeatureInfo request so that it can populate the wms_record.html. As
> an example, I am using the wms services at www.datafinder.org
> <http://www.datafinder.org>. The url that the identify.php is building
> for my request is this:
>
>
>
> http://www.datafinder.org/wmsconnector/com.esri.wms.Esrimap/MN_MetroGIS_DataFinder_WMS_Recreation_Tourism?&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetFeatureInfo&WIDTH=100&HEIGHT=100&X=50&Y=50&EXCEPTIONS=application/vnd.ogc.se_xml&LAYERS=bikeways&QUERY_LAYERS=bikeways&BBOX=508702.025,4993206.245,508902.025,4993406.245&SRS=EPSG:26915&STYLES=&INFO_FORMAT=application/vnd.ogc.gml
> <http://www.datafinder.org/wmsconnector/com.esri.wms.Esrimap/MN_MetroGIS_DataFinder_WMS_Recreation_Tourism?&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetFeatureInfo&WIDTH=100&HEIGHT=100&X=50&Y=50&EXCEPTIONS=application/vnd.ogc.se_xml&LAYERS=bikeways&QUERY_LAYERS=bikeways&BBOX=508702.025,4993206.245,508902.025,4993406.245&SRS=EPSG:26915&STYLES=&INFO_FORMAT=application/vnd.ogc.gml>
>
> As you can see if you hit this url, I am not getting any attribute
> information back. Any ideas why? Is there something missing from my request?
>
>
>
> (Yes, the wms layer is queryable.)
>
>
>
> Thanks for your help!
>
>
>
> Liesa Miller
>
> MnDOT Metro District
>
>
>
>
>
> *From:* Brian Fischer [mailto:bfischer at houstoneng.com]
> *Sent:* Thursday, April 22, 2010 12:17 PM
> *To:* Miller, Elizabeth (DOT); geomoose-users at lists.sourceforge.net
> *Subject:* Re: [Geomoose-users] Identify Attributes on a WMS
>
>
>
> In your mapfile that you are trying to identify on are you using?
>
> METADATA
>
> 'wms_record'
> 'identify_parcel.html'
>
> END
>
>
>
> I believe that is what tells the GeoMOOSE code to make a WMS identify
> request versus a MapServer identify request. Have you look to see what
> firebug is return for results? When I look through the identify.php
> code it appears to all be in there, but it is looking for the wms_record
> parmater in the mapfile.
>
>
>
> Like I said I have not tried to use this feature myself but it is
> suppose to be supported. Hope this helps you debug it a little bit more.
>
>
>
> *Brian Fischer,* CFM GIS Project Manager
> *Houston Engineering, Inc.*
> Phone: Direct: 763-493-6664 / W: 763.493.4522 / M: 763.229.2734
>
>
>
> *From:* Miller, Elizabeth (DOT) [mailto:Elizabeth.Miller at state.mn.us]
> *Sent:* Thursday, April 22, 2010 11:52 AM
> *To:* Brian Fischer; geomoose-users at lists.sourceforge.net
> *Subject:* RE: Identify Attributes on a WMS
>
>
>
> Thanks Brian,
>
>
>
> Yep, the WMS source should have attributes available for request. Here’s
> my current METADATA code. As you can see, I think I’ve thrown everything
> but the kitchen sink in there. If you have any ideas or see any glaring
> errors let me know.
>
>
>
> LAYER...
>
> METADATA
>
> "wms_identify" "identify_data.html"
>
> "wms_record" "identify_data.html"
>
> "wms_title" "layertitle"
>
> "wms_srs" "EPSG:26915"
>
> "wms_name" "layername"
>
> "wms_server_version" "1.1.1"
>
> "wms_format" "image/gif"
>
> "wms_styles" ""
>
> "wms_exceptions" "application/vnd.ogc.se_inimage"
>
> "wms_request" "GetMap"
>
> "wms_request" "GetFeatureInfo"
>
> "wms_include_items" "all"
>
> "wms_feature_info_mime_type" "text/html"
>
> END
>
> DUMP TRUE
>
> TEMPLATE '/ms4w/.../identify_data.html'
>
> TOLERANCE 3
>
> ...END
>
>
>
>
>
> *From:* Brian Fischer [mailto:bfischer at houstoneng.com]
> *Sent:* Wednesday, April 21, 2010 3:43 PM
> *To:* Miller, Elizabeth (DOT); geomoose-users at lists.sourceforge.net
> *Subject:* RE: Identify Attributes on a WMS
>
>
>
> Liesa,
>
> First thing you will have to figure out is if the WMS source has setup
> any attributes to return with a getinfo wms request. It should be
> published in the GetCapbilities if it is. Not all WMS servers are setup
> by default to return all attributes.
>
>
>
> I have never tried to use the identify with a WMS data source, but I
> believe Dan added support for it. I have seen there are configuration
> settings for the html templates in settings.ini file.
>
>
>
> *Brian Fischer,* CFM GIS Project Manager
> *Houston Engineering, Inc.*
> Phone: Direct: 763-493-6664 / W: 763.493.4522 / M: 763.229.2734
>
>
>
> *From:* Miller, Elizabeth (DOT) [mailto:Elizabeth.Miller at state.mn.us]
> *Sent:* Wednesday, April 21, 2010 3:07 PM
> *To:* geomoose-users at lists.sourceforge.net
> *Subject:* [Geomoose-users] Identify Attributes on a WMS
>
>
>
> I’m looking for help in setting up an identify on a wms layer. I am
> using a mapfile to bring in the layer rather than setting up the
> connection in the mapbook. Does anyone have an example of how to do
> this? I would like to be able to click with the identify tool on the
> layer and return attributes in an html template.
>
>
>
> Thanks!
>
>
>
> Liesa Miller
>
> MnDOT Metro District
>
>
>
>
>
>
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