topic Re: identify - no results in ArcGIS API for Flex Questions

identify - no results

GaryBushek — Fri, 09 Apr 2010 16:41:18 GMT

Im having some issues with the identfy widget and im not sure if its the widget or my map service. I have about 20 layers and only about 4 or 5 show results when identifying. So it works for some layers and not others. To rule out the tolerance being a factor, some of the layers that dont work are polygon features so im definitely hitting the features but it returns "no results". Its not throwing any errors in the code. I have it set to identify visible layers only and I zoom to the features im trying to identify so I can physically see the features and it just doesnt identify. I compared the identifyParams.layerIds with my rest service endpoint to be sure the layer id was correct for the layer i wanted to identify on. Everything seems to look correct. It just seems to not like most of the layers for some reason. Any help is appreciated.

Thanks, Gary

identify - no results

GaryBushek — Fri, 09 Apr 2010 17:01:15 GMT

I think I just figured out that its only identifying the current visible layers as long as they were one of the original visible layers of the map service. I'm not sure what to make of that. I would think the code would work for any visible layer regardless of whether it was on or off originally. I will dig around the code to see if I can fix that but if anyone has any ideas let me know.

Thanks again, Gary

no- results

GaryBushek — Fri, 09 Apr 2010 17:34:20 GMT

ok, chalk it up to me not understanding how the identify is supposed to work. apparently "visble" doesnt mean currently visible but originally visible. I switched it to "All" and it identifies on all currently visible layers...

Thanks for the Post

JeffMitzelfelt — Mon, 12 Apr 2010 17:49:41 GMT

I have been trying to figure this out off and on for a week or so. I had used the "all" early on in my adventures, but thought the individual layers should be accessible and was stumbling around trying to figure this out.

Identify not working using LayerID's...

GISAdmin1 — Fri, 16 Apr 2010 14:47:28 GMT

I have a simple MSD based service with four layers. For some reason, if I use the Identify REST call using the "all" keyword for the layers parameter, I get all of the data returned. If I use a valid layerId for the layers parameter, I just get data returned back for the first layer. The same thing happens for ESRI's demo service:

This request returns all layers:

http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Portland/Portland_ESRI_LandBase_AGO/MapServer/identify?geometryType=esriGeometryPoint&geometry=-122.6762+%2C45.5235&sr=&layers=all&tolerance=5&mapExtent=-123.596895130833%2C44.8091202495904%2C-121.553757125412%2C45.8567792045506&imageDisplay=600%2C550%2C96&returnGeometry=false

This request just returns data from layerid=4, even thought the id is set the the third layer:

http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Portland/Portland_ESRI_LandBase_AGO/MapServer/identify?geometryType=esriGeometryPoint&geometry=-122.6762+%2C45.5235&sr=&layers=3&tolerance=5&mapExtent=-123.596895130833%2C44.8091202495904%2C-121.553757125412%2C45.8567792045506&imageDisplay=600%2C550%2C96&returnGeometry=false

Any idea why this is happening?

identify - no results

BjornSvensson — Fri, 16 Apr 2010 15:42:27 GMT

To get the behavior I think you are expecting, you need to specify "all:3", as the default is "top".

See http://resources.esri.com/help/9.3/arcgisserver/apis/rest/index.html?identify.html for more information on the layer parameter for identify.

identify - no results

DasaPaddock — Fri, 16 Apr 2010 15:42:59 GMT

You would need to set layers to: all:3
See: http://resources.esri.com/help/9.3/arcgisserver/apis/rest/identify.html

Re: identify - no results

RoyceSimpson — Thu, 03 Jun 2010 14:54:38 GMT

I'm having the same issue as gbushek and have attempted "identifyParams.layerOption = 'all';".

If I go into the mxd and turn on all the layers, the Identify operation works fine, but when I turn them all off in the mxd and then in the Flex app, use "visibleLayers" to manually turn on layers, then perform an Identify, I get no identify results. I've tried various combinations of identifyParams.layerOption and identifyParams.layerIds with no success.

Is this the intended functionality, bug or am I missing something?

Re: identify - no results

DasaPaddock — Thu, 03 Jun 2010 19:36:18 GMT

Setting the identifyParams.layerOption to "all" should be all you need to do. Are you able to reproduce this issue when using the REST Services Directory identify page? You may need to contact ESRI Support to see if this is a bug or known issue with your configuration.

Re: identify - no results

BradOleson — Thu, 03 Jun 2010 19:51:27 GMT

I am having a very similar issue - if I use the sample Parcels map service provided in the sample, ID works fine. If I try to use my layers, no results are returned. I have my "<identifylayeroption>" set to "all" in identifywidget.xml. Seems several of us are experiencing the same problem?

Brad

Re: identify - no results

RoyceSimpson — Thu, 03 Jun 2010 20:14:12 GMT

I just published the mxd as a map service using MSD file and now the identify works. I can put in the same parameters for the MSD based service and the standard dynamic service (geometry, layers, map extent, etc...). One produces results, the other doesn't.

Odd indeed.

Re: identify - no results

RoyceSimpson — Thu, 03 Jun 2010 20:37:00 GMT

Now I'm really confused.

Why does this return results for the 11th layer? (Where is the documentation on this syntax?)
identifyParams.layerOption = "all:11"

But this doesn't...
identifyParams.layerOption = "all"; identifyParams.layerIds = [11];

and this doesn't seem to work when manually setting visiblelayers property properly.
identifyParams.layerOption = "visible" ..."visible:11"

Re: identify - no results

RoyceSimpson — Thu, 03 Jun 2010 20:59:36 GMT

Ok, here is the REST doc on the "all:3" syntax...

Description: The layers to perform the identify operation on. There are three ways to specify which layers to identify on:

    * top: Only the top-most layer at the specified location.
    * visible: All visible layers at the specified location.
    * all: All layers at the specified location.

Example: layers=all

Default: By default the identify operation identifies the top-most layer (i.e. layers=top)

You can either specify the layer options as mentioned above by themselves or specify the layer option in conjunction with a list of layer IDs. When both the layer option as well as the layer IDs are specified, the server treats it as a boolean "AND" operator. For example, if the parameter is specified as: layers=visible:2,5 only layers with IDs 2 and 5, if visible, are identified.

Re: identify - no results

BradOleson — Thu, 03 Jun 2010 21:02:18 GMT

I'd be happy if it ID's on ANY of my layers, and it is set to "all".

Re: identify - no results

DasaPaddock — Thu, 03 Jun 2010 21:02:27 GMT

identifyParams.layerOption = "all"; identifyParams.layerIds = [11]; is the proper use of the API. You could call identifyParams.layerOption = "all:11" a shortcut way of doing the same thing. Either way, the REST request should be the same. Are they not? What version of the API are you using?

Re: identify - no results

RoyceSimpson — Thu, 03 Jun 2010 22:13:37 GMT

API 2.0 update 3.

This is the only solution that i've gotten to fully work so far.
I have to use the "all" option since "visible" never returns results no matter how many layers I set "visibleLayers" for.
Then I set the layerIds property to the current visibleLayers property.

identifyParams.layerOption = "all";
identifyParams.layerIds = assetMap.visibleLayers.source;

Re: identify - no results

DasaPaddock — Thu, 03 Jun 2010 22:19:08 GMT

This is the correct usage and behavior. When identifying on "visible" layers, it's working against the default layer visibilities as defined in the service/mxd, not the overrides you've made on the client on the ArcGISDynamicMapServiceLayer.

Re: identify - no results

RoyceSimpson — Fri, 04 Jun 2010 13:02:03 GMT

Thanks for the info.

Re: identify - no results

BradOleson — Fri, 04 Jun 2010 16:22:46 GMT

I inadvertently found something that may be affecting the ID issue: projection.

I'm working (in another forum thread) on getting my maps to be projected in UTM (for a grid layer that must be in that projection). I changed the way my map loads by taking out the StreetMap and Satellite maps and just having mine load, with the extents changed to UTM coordinates (to match my projected map service layer). Now, not only is the grid layer correct, but the ID tool works fine on all of my layers. Why wasn't it working when projected to overlay the StreetMap data in Lat/Lon, but now it works?

Re: identify - no results

DasaPaddock — Fri, 04 Jun 2010 16:56:39 GMT

This should be set:
http://help.arcgis.com/en/webapi/flex/apiref/com/esri/ags/tasks/supportClasses/IdentifyParameters.html#spatialReference