topic Re: widget for identify values in raster data using ARCGIS VIEWER for flex. in ArcGIS Viewer for Flex Questions

widget for identify values in raster data using ARCGIS VIEWER for flex.

NadeemQazi — Wed, 31 Oct 2012 10:55:24 GMT

I have used Kernel Density tool from the spatial analyst tool on one of my layer in the map document. the result is generated as raster data.i used identify tool (in the ARCMAP) to find the density at any point. However I want to do the same job from client side using ARCGIS VIEWER for flex.

The things i want to know is :
should i publish map as map service or image service to access the density at every point under browser. and am i right is thinking to use identify task or is there some other trick. please give suggestion. is there any widget available.

Re: widget for identify values in raster data using ARCGIS VIEWER for flex.

AnthonyGiles — Wed, 31 Oct 2012 12:23:54 GMT

Nadeem,

If you publish your image as part of a map service you can use the identify tool to return pixel values:

http://www.arcgis.com/home/item.html?id=39cf66d58c234279ba728c50461a1a89

This advise has been given before in this post:

http://forums.arcgis.com/threads/67208-kernel-density-on-raster-image-using-flex-API-or-geoprocessing?p=233863#post233863

Are you having difficulty with the process, if so please explain

Regards

Anthony

Re: widget for identify values in raster data using ARCGIS VIEWER for flex.

NadeemQazi — Wed, 31 Oct 2012 17:23:57 GMT

Nadeem,

If you publish your image as part of a map service you can use the identify tool to return pixel values:

http://www.arcgis.com/home/item.html?id=39cf66d58c234279ba728c50461a1a89

This advise has been given before in this post:

http://forums.arcgis.com/threads/67208-kernel-density-on-raster-image-using-flex-API-or-geoprocessing?p=233863#post233863

Are you having difficulty with the process, if so please explain

Regards

Anthony

Thanks for reply. I did use this widget however i was unable to specify my map 's layer in it. I Can see the widget in my application however it shows predefined layers not the layers from my map. I have checked its XML file but could not get any thing. is there any link which shows how to use this widget in arcgis viewer for flex.

Re: widget for identify values in raster data using ARCGIS VIEWER for flex.

AnthonyGiles — Wed, 31 Oct 2012 17:37:45 GMT

Nadeem,

Robert has included a PDF document in the download that explains how to set up the widget.

Regards

Anthony

Re: widget for identify values in raster data using ARCGIS VIEWER for flex.

RhettZufelt — Wed, 31 Oct 2012 18:41:29 GMT

Once you get it configured to use your layers instead of the default in the identifyWidget.xml, you may have issues with raster data.

I had to set <fields all="true" /> in the identifyWidget.xml for my raster layer in order to get the results.

In case this help,

R_

Re: widget for identify values in raster data using ARCGIS VIEWER for flex.

NadeemQazi — Fri, 02 Nov 2012 13:54:21 GMT

Once you get it configured to use your layers instead of the default in the identifyWidget.xml, you may have issues with raster data.

I had to set <fields all="true" /> in the identifyWidget.xml for my raster layer in order to get the results.

In case this help,

R_

I use with <fields all="true" /> . ihave just one rast layer in my map. i used following line in the xml file
<name>kerneldensity</name>
            <fields all="true">
                <field name="kerneldensity" alias="kerneldensity"/>
                <field name="ZONING_TYPE" alias="Zoning Type" popuponly="true"/>
            </fields>

this lines does produce the name of the layer in the widget,however when i chose point and click on the layer to check the density i did nt find any thing in result window. i also checked it with lines make a ploygon but it also did not produce any layer. please note it that i have created this raster layer by using kernel density function in the arcmap and for simplicity i have just used only the raster layer in my map. any suggestion.

Re: widget for identify values in raster data using ARCGIS VIEWER for flex.

AnthonyGiles — Fri, 02 Nov 2012 14:49:37 GMT

Nadeem,

Have you added your layer as a basemap or operational layer? If it is a basemap make sure you have changed the tag called excludebasemaps to false

Regards

Anthony

Re: widget for identify values in raster data using ARCGIS VIEWER for flex.

NadeemQazi — Fri, 02 Nov 2012 15:11:05 GMT

Nadeem,

Have you added your layer as a basemap or operational layer? If it is a basemap make sure you have changed the tag called excludebasemaps to false

Regards

Anthony

i did it making it false however still it says no result found.there is only one raster layer in my map.i have use it as base map and make excludebasemap layer to false. When i use identify tool on this raster layer in arcmap it displays kernel density as value of pixels,in other word value of the pixel represent the kernel density value. I have published it as simple map service. any suggestion
regards
nadeem

Re: widget for identify values in raster data using ARCGIS VIEWER for flex.

AnthonyGiles — Fri, 02 Nov 2012 15:20:56 GMT

Nadeem,

I have published elevation data in the exact same way in which you are publishing your data. I found that although the alias in the REST endpoint for the pixel value says Value it actually returns as 'Pixel value' so the layers tag looks like this:

<layer>
<name>DTED2</name>
<fields>
<field alias="Height" name="Pixel Value" />
</fields>
.......
</layer>

Are your field names an exact match to the Alias field in the REST endpoint?

Is your service publicly available so we can look at it

Regards

Anthony

Re: widget for identify values in raster data using ARCGIS VIEWER for flex.

NadeemQazi — Fri, 02 Nov 2012 15:38:53 GMT

Nadeem,

I have published elevation data in the exact same way in which you are publishing your data. I found that although the alias in the REST endpoint for the pixel value says Value it actually returns as 'Pixel value' so the layers tag looks like this:

<layer>
<name>DTED2</name>
<fields>
<field alias="Height" name="Pixel Value" />
</fields>
.......
</layer>

Are your field names an exact match to the Alias field in the REST endpoint?

Is your service publicly available so we can look at it

Regards

Anthony

thank you very much for your help. if u like i can email you the data so that u can look on it. is it ok. meanwhile i m trying your new suggestion.

Re: widget for identify values in raster data using ARCGIS VIEWER for flex.

AnthonyGiles — Fri, 02 Nov 2012 15:42:19 GMT

Nadeem,

How big is the file? If it is small enough to email then by all means send it to me, my email address is the same as my username for this forum. I will not be able to look at it till later next week though.

Regards

Anthony

Re: widget for identify values in raster data using ARCGIS VIEWER for flex.

NadeemQazi — Fri, 02 Nov 2012 17:51:27 GMT

Nadeem,

How big is the file? If it is small enough to email then by all means send it to me, my email address is the same as my username for this forum. I will not be able to look at it till later next week though.

Regards

Anthony

thank you total size is about 25MB, I have just emailed them from my account nadeemhqazi@yahoo.com in set of two email. The path of source file is "C:\wexford\data\test3" please extract the rar file(kerneldensity) under this path and copy the rest of the two files(kerneldesnity.aux,kerneldensity.ovr,rasteronly) in C:\wexford\data\test3. the name of the map file is rasteronly. I am sending these file in another email becaz of the size problem

I have published it as map service on arcgis server10.1 and using the arcviewer for flex and the identify flex i a m trying to find the kernel density . please have a look and let me know what i am doing wrong. I appreciate your time.
regards
nadeem

Re: widget for identify values in raster data using ARCGIS VIEWER for flex.

ChristopherBlinn1 — Fri, 02 Nov 2012 17:58:25 GMT

Nadeem,

I had to create a Raster Attribute Table to get the identify to work in my application.

You have to convert the values to integer values but with a little math using the Raster Calculator I got it all done, and it works like a charm.

I cannot tell if this is absolutely necessary but it did resolve my issue with identifying raster pixel values.

Hope this helps!
Chris B.

Re: widget for identify values in raster data using ARCGIS VIEWER for flex.

RhettZufelt — Sat, 11 Dec 2021 21:45:31 GMT

What version of the Identify widget are you using? In the earlier versions, If I had the actual name of a raster layer in the <layers> area, I could not get the pixel values.

had to code it like:

 <fields all="true" />

With no name and/or fields, then it would report the class and pixel value of the raster.

With the latest identify widget I am able to configure like such and get the data returned:

 <layers onlythese="true">
  <layer>
   <name>Elevation</name>
   <fields all="false">
    <field name="Pixel Value" alias="NAVD88 (m)"  numberformat="2|,|." />
   </fields>

Re: widget for identify values in raster data using ARCGIS VIEWER for flex.

AnthonyGiles — Tue, 06 Nov 2012 06:17:48 GMT

Nadeem,

I published your data using 9.3.1 on our server and tested the identify widget which returned no result. Using firebug in Firefox I examined the request that was getting sent and the response. It seems that the server does not like the spatial reference details that it is being sent and is returning an error.

The solution I found was to put the attribute wkid="29900" in the map tag in the main config file to force the application to use the correct spatial reference.

All I had set in the identify tool was excludebasemaps set to false and <fields all="true" />. This returned the correct pixel value.

I must add this was done with v2.5 and server 9.3.1

Regards

Anthony

Re: widget for identify values in raster data using ARCGIS VIEWER for flex.

RobertScheitlin__GISP — Tue, 06 Nov 2012 10:30:57 GMT

All,

I just need to interject that you need to be careful not to confuse attributes between my widgets. The <fields all="true" /> is from the eSearch widget and not the Identify widget. There is no code what so ever in the Identify widget that uses all="true" in the fields element. 😉

Re: widget for identify values in raster data using ARCGIS VIEWER for flex.

AnthonyGiles — Tue, 06 Nov 2012 15:29:05 GMT

Robert,

Quite correct, I meant <layers onlythese="true">

I think I just picked up on something further up the thread and didn't check.

Sorry for any confusion Nadeem,

Regards

Anthony

Re: widget for identify values in raster data using ARCGIS VIEWER for flex.

RhettZufelt — Tue, 06 Nov 2012 15:42:55 GMT

All,

I just need to interject that you need to be careful not to confuse attributes between my widgets. The <fields all="true" /> is from the eSearch widget and not the Identify widget. There is no code what so ever in the Identify widget that uses all="true" in the fields element. 😉

Whoops, guess I carried that over from the Identify widget 3.0i example.xml that does have the <fields all="true" /> in it. Will make sure I update my configs.

R_

Re: widget for identify values in raster data using ARCGIS VIEWER for flex.

NadeemQazi — Wed, 07 Nov 2012 10:49:53 GMT

Nadeem,

I published your data using 9.3.1 on our server and tested the identify widget which returned no result. Using firebug in Firefox I examined the request that was getting sent and the response. It seems that the server does not like the spatial reference details that it is being sent and is returning an error.

The solution I found was to put the attribute wkid="29900" in the map tag in the main config file to force the application to use the correct spatial reference.

All I had set in the identify tool was excludebasemaps set to false and <fields all="true" />. This returned the correct pixel value.

I must add this was done with v2.5 and server 9.3.1

Regards

Anthony

Hi anthony
I applied as u wrote . here is the line i modified in the config file:
<map wkid="29900" esrilogovisible="true" openhandcursorvisible="true" scalebarvisible="true" zoomslidervisible="false" wraparound180="true" addarcgisbasemaps="true" top="40">

than in IdentifyWidget_1.xml i used this tag: i just change tje name to kerneldensity whihc is the nameof mylayer and left other as default.
<layer>
            <name>kerneldensity</name>
            <fields>
                <field name="ZONING_NAME" alias="Zoning Name"/>
                <field name="ZONING_TYPE" alias="Zoning Type" popuponly="true"/>
            </fields>
            <links>
                <link includeinresults="false" field="" alias="" tooltip="">
                    <linkprefix/>
                    <linksuffix/>
                    <iconfield/>
                    <iconprefix/>
                    <iconsuffix/>
                </link>
            </links>
            <zoomscale>15000</zoomscale>
            <forcescale>true</forcescale>
        </layer>

However it still produce me No result. please note that when i used identify widget it has created two files IdentifyWidget_1.xml and IdentifyWidget.xml. I modifed IdentifyWidget_1.xml with the above modification. Please also let me know how did you find error with firebug as i am trying to catch error .
regards
nadeem

Re: widget for identify values in raster data using ARCGIS VIEWER for flex.

RhettZufelt — Sun, 12 Dec 2021 16:32:30 GMT

Nadeem,

It shouldn't make any xml files, just the swf when you compile.

However, if you do have two xml files, did you make sure that your widget tag in the config.xml points to the one you are modifying?

        <widget label="Identify" left="430" top="80" height="150"
                icon="assets/images/i_info.png"
                config="widgets/Identify/IdentifyWidget_1.xml"
                url="widgets/Identify/IdentifyWidget.swf"/>