topic Re: Heatmaps in ArcGIS JavaScript Maps SDK Questions

Heatmaps

JorgeFiallega — Fri, 25 Jun 2010 13:16:16 GMT

I want to creat a heatmap. I seems that the examples points to using heatmapapi.com but it is unavailable and it seems that has been unavailable for a while.
What is the recommended way or library to use to create heatmaps. It seems that the silverlight library has it.

Re: Heatmaps

BrettLord-Castillo — Fri, 25 Jun 2010 15:50:07 GMT

Well, using server side calculation, you can just wrap the kernel density tool in a tool service in order to do heat map.
What the silverlight example does, though, is execute kernel density server side and produce output using a png encoder. The intensity slider corresponds to the kernel bandwidth.
I've always been opposed to the concept behind the heatmap api though, because kernel density requires a lot of consideration of the bandwidth and the kernel shape in order to be used appropriately. A Gaussian kernel is not always the right way to go; a fixed kernel is not always best. The bandwidth requires a lot of examination of the dataset to get correct, and a variable bandwidth may or may not be appropriate.
Pushing all of this down into a single set of variables, or even into user side settings when the user does not have a spatial analysis background, is going to put out bad results more often than useful results.

So, it might be better to use server side python scripts to produce the output you want with appropriate decisions in place on the kernel density output (even if esri only has a Gaussian kernel density tool right now - more versions are coming at 10). Push that output to a map service and server that out instead.

Re: Heatmaps

AxelSchaefer — Tue, 06 Jul 2010 14:04:23 GMT

Yepp, I've done it with the Kernel Density tool in a Geoprocessing layer in the MXD. The output is the raster of the tool. The task is done asynchronously.

Re: Heatmaps

JorgeFiallega — Fri, 16 Jul 2010 12:00:53 GMT

Great Thanks, I will have to talk to my GIS group.
On the mean time I found in one of the sample projects a library called hclayer.swc with packages like com.esri.ps.atl.rr.heatmap. I plugged it in and it did the trick (for what I needed it right now, and I totally understand and agree on lordcabs comments).
I can not find any documentation or mention to this library anywhere.
Seems to be an esri library by the packages names that contains. Can anybody point me or give me information about this libarary.

Re: Heatmaps

RickZawadzki — Fri, 15 Apr 2011 16:33:07 GMT

Hi Jorge,

Were you able to implement a heatmap using the javascript api and the com.esri.ps.atl.rr.heatmap library? I'm interested in learning how to do this with the Google Extension API without resorting to the heatmapapi.com approach. Any insight as to how you implemented your solution would be greatly appreciated. Thanks Jorge!

Re: Heatmaps

nidhiarora — Tue, 12 Jul 2011 16:13:15 GMT

Great Thanks, I will have to talk to my GIS group.
On the mean time I found in one of the sample projects a library called hclayer.swc with packages like com.esri.ps.atl.rr.heatmap. I plugged it in and it did the trick (for what I needed it right now, and I totally understand and agree on lordcabs comments).
I can not find any documentation or mention to this library anywhere.
Seems to be an esri library by the packages names that contains. Can anybody point me or give me information about this libarary.

Hi Jorge , this libraryhclayer.swc is for flex api or javascript api ?. I also need to implement heat maps through arcgis javascript interface .
heatmapapi is not feasible as it only allows 100 points to used for its free version.also i need support for IE 6 , 7, 8 therefore cannot use javascript lib which utilize HTML5 elements.

I am also trying to use kernal density tool to publish the map as Geoprocessing service . I have point data and all the points have equal weights. Need to create heat map based upon the concentration.

Simlar but different

CodyPriest — Wed, 17 Aug 2011 18:33:29 GMT

I am writing a script in python that uses the Kernel Density tool.

I am having problems specifying the output raster. In the tool from the toolbox there is a field to specify the output location (which the default is giving me an error), but when using the python window it doesnt give me a space to designate the output location.

The syntax from the esri website is
KernelDensity (in_features, population_field, {cell_size}, {search_radius}, {area_unit_scale_factor})

Is there anyway to give it an output location other than the default?

Any help would be much appreciated.

Cheers,

Cody

Re: Simlar but different

ShaneBailey — Fri, 06 Jan 2012 15:01:24 GMT

Did you ever figure this out? I am having the same issue.

I am writing a script in python that uses the Kernel Density tool.

I am having problems specifying the output raster. In the tool from the toolbox there is a field to specify the output location (which the default is giving me an error), but when using the python window it doesnt give me a space to designate the output location.

The syntax from the esri website is
KernelDensity (in_features, population_field, {cell_size}, {search_radius}, {area_unit_scale_factor})

Is there anyway to give it an output location other than the default?

Any help would be much appreciated.

Cheers,

Cody

Re: Heatmaps

MattDriscoll — Sat, 07 Jan 2012 01:51:18 GMT

We're implementing heatmapping for an update to the Public Information Map template using Heatmap.js

Screens attached on how it looks.

Here's the link. Let me know if you need the source code.
http://www.patrick-wied.at/static/heatmapjs/

Re: Heatmaps

StephenLead — Sun, 08 Jan 2012 22:59:19 GMT

Hi Matt,

Let me know if you need the source code.

I'd like the source code please. Stephen dot Lead at Gmail dot com.

Cheers,
Steve

Re: Heatmaps

MattDriscoll — Mon, 09 Jan 2012 15:05:11 GMT

Hi Matt,

I'd like the source code please. Stephen dot Lead at Gmail dot com.

Cheers,
Steve

Sent.

BTW the heatmapping uses HTML5 so no IE6, 7 or 8 support.

Re: Heatmaps

TonyMonsour — Sun, 12 Feb 2012 04:54:55 GMT

I have been trying to come up with this myself. I would love the source code myself if possible.
Thanks,
Tony
mons0160 at gmail dot com

Re: Heatmaps

MattDriscoll — Mon, 13 Feb 2012 22:10:22 GMT

I have been trying to come up with this myself. I would love the source code myself if possible.
Thanks,
Tony
mons0160 at gmail dot com

Let me know if you got the code.

Thanks

Re: Heatmaps

MattDriscoll — Mon, 23 Jul 2012 01:16:06 GMT

This code is now here: http://www.arcgis.com/home/item.html?id=3a6d8158252e4b96a8ecfb8b912df78d