topic Identify on Raster Layer in ArcGIS JavaScript Maps SDK Questions

Identify on Raster Layer

JoshObrecht — Fri, 05 Nov 2010 13:44:09 GMT

I am having an issue obtaining attribute data off of a raster layer from my map service. The attribute data is retrieved but when I call attributes in the code, it claims it is undefined. If I call idResults[0].value, I get the value of -1842.

This is the code trying to obtain the attributes and returns nothing. Calling idResults[0].attributes produces undefined:

identifyTask.execute(identifyParams, function(idResults){
alert(idResults[0].attributes['Pixel Value']);
});

The identify task returns:

{"results":[{"layerId":0,"layerName":"phm_7605_wma","value":"-1842","displayFieldName":"","attributes":{"Class value":"359","Pixel Value":"-1842","Rowid":"2172","COUNT":"7277"},"geometryType":"esriGeometryPoint","geometry":{"x":-10942189.7542115,"y":4446207.90340335,"spatialReference":{"wkid":102100}}}]}

Any ideas?

Re: Identify on Raster Layer

timgogl — Mon, 08 Nov 2010 19:38:45 GMT

maybe : alert(idResults[0]['Pixel Value']);

i had a similar problem not long ago working with the dojo dataStore object

Re: Identify on Raster Layer

AdrianMarsden — Sat, 11 Dec 2021 22:23:18 GMT

Hi - old thread revival - I'm trying to get the Id task to get values from a DTM stored as a raster/grid.

The ID task brings back data, but doesn't return layername or field names -


displayFieldName: ""
feature: Object

attributes: Object

Pixel Value: "98.396004"
Stretched value: "92"
__proto__: Object
geometry: Object
infoTemplate: undefined
symbol: null
__proto__: Object
geometryType: "esriGeometryPoint"
layerId: 43
layerName: ""

Any ideas how to work round this - have I missed something here?

Cheers

ACM