[OpenLayers-Users] Getting values from a WMS with GeoTiff file

[Riccardo Di Stefano]

Hello everyone!

 

I'm quite new to OpenLayers, and completely new to WMS querying. I'm needing
some help here.

 

I have to query values of a WMS hosted by Geoserver from a GeoTiff file. 

What is the best way? Following the examples I found on the web (i.e.
http://dev.openlayers.org/releases/OpenLayers-2.13.1/examples/getfeatureinfo
-control.html), I tried to perform a WMSGetFeatureInfo like follows:

 

 

function initialize(){

 

var resolutions =
OpenLayers.Layer.Bing.prototype.serverResolutions.slice(MYMIN, MYMAX);

 

var layer_BNI = new OpenLayers.Layer.WMS("MY TITLE",

            "http://localhost:8080/geoserver/wms",

            { 'layers': 'MYLAYER', transparent: true, format: 'image/png' },

            { isBaseLayer: false }

       );

 

var map = new OpenLayers.Map({

div: MYDIV,

theme: null,

projection: "EPSG:900913",

layers: [

layer_BNI,

new OpenLayers.Layer.OSM("MapQuest-OSM Tiles", arrayOSM, {

attribution: "<p>Data, imagery and map information provided by <a
href='http://www.mapquest.com/'  target='_blank'>MapQuest</a>, <a
href='http://www.openstreetmap.org/' target='_blank'>Open Street Map</a> and
contributors, <a href='http://creativecommons.org/licenses/by-sa/2.0/'
target='_blank'>CC-BY-SA</a> <img
src='http://developer.mapquest.com/content/osm/mq_logo.png'
border='0'></p>",

transitionEffect: "resize", 

zoomOffset: MYMIN,

                            resolutions: resolutions

                   })

],

controls: [

new OpenLayers.Control.Attribution(),

new OpenLayers.Control.Navigation()

],

center: [0, 0],

zoom: MYZOOM

});

 

 

var info = new OpenLayers.Control.WMSGetFeatureInfo({

        url: 'http://localhost:8080/geoserver/wms',

        title: 'Identify features by clicking',

        layers: [layer_BNI],

        eventListeners: {

            getfeatureinfo: getInfo

        },

        queryVisible: true

    });

 

map.addControl(info);

info.activate();

 

}

 

function getInfo(event) {

//event is always empty

}

 

 

My layers are loaded and shown correctly, getInfo is fired correctly, but
event.text is ALWAYS an empty string.

With QGIS values are extracted correctly from my WMS, so I guess the issue
is not WMS-side but client-side.

What am I doing wrong?

 

 

Thank you very much!

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