topic kernel density on raster image using flex API or geoprocessing in ArcGIS API for Flex Questions

kernel density on raster image using flex API or geoprocessing

NadeemQazi — Wed, 19 Sep 2012 11:22:31 GMT

I have used a Kernel density function from spatial Analyst tool box on a feature class and have determined the kernel density of an attribute. I then used the identify function in ArcMap to check the density at any point on map. However i want to publish this map on web. Is there any way to find the kernel density of an attribute on a published map at any point while accessing the published map through the browser. is there any function of flex API that i am suppose to use or should use the geo processing service. Any suggestion.

Re: kernel density on raster image using flex API or geoprocessing

AnthonyGiles — Wed, 19 Sep 2012 16:35:20 GMT

Nadeem,

You should be able to publish your density raster layer as you would any other layer. This will make it identifyable through the services rest end point.

Use the IdentifyTask class to identify your layer:

http://help.arcgis.com/en/webapi/flex/apiref/com/esri/ags/tasks/IdentifyTask.html

Regards

Anthony

Re: kernel density on raster image using flex API or geoprocessing

Anonymous User — Thu, 20 Sep 2012 03:38:00 GMT

As for publishing options you can use ArcGIS for Server publishing tools or create an ArcGIS Online account and create a web map including your kernel density layer.

Re: kernel density on raster image using flex API or geoprocessing

NadeemQazi — Fri, 21 Sep 2012 15:34:46 GMT

Nadeem,

You should be able to publish your density raster layer as you would any other layer. This will make it identifyable through the services rest end point.

Use the IdentifyTask class to identify your layer:

http://help.arcgis.com/en/webapi/flex/apiref/com/esri/ags/tasks/IdentifyTask.html

Regards

Anthony

Thanks Anthony, however I have one more query and it is about identify task. the help says it is used for identifying layer whereas i want to determine the density as calculated in the raster layer after applying the kernal density function , so can u please give me some clue how to use this function for my purpose.
Regards

Re: kernel density on raster image using flex API or geoprocessing

AnthonyGiles — Fri, 21 Sep 2012 16:52:25 GMT

Nadeem,

I don't know if you have tried Roberts enhanced identify tool which can be used in the sample viewer but this uses the identify task and when used against a raster layer it returns the attributes for that layer. Maybe have a look at his code which may point you in the right direction:

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

Regards

Anthony

Re: kernel density on raster image using flex API or geoprocessing

ChristopherBlinn1 — Fri, 21 Sep 2012 17:22:43 GMT

Thanks Anthony, however I have one more query and it is about identify task. the help says it is used for identifying layer whereas i want to determine the density as calculated in the raster layer after applying the kernal density function , so can u please give me some clue how to use this function for my purpose.
Regards

After you create the KDE output, create the raster attribute table. You'll have to convert your values to integers, but the raster calculator can help with that. You can always add a field to the table and recalculate the actual density values.

The raster attribute table will contain the density value. You can even add a text field and populate it with a statement such as:

"The density at this location is " & [DENSITY VALUE FIELD] & "."

Then using the identifytask you can then identify the density values.