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Heat Map on ArcGIS Viewer for Flex

MESHALALMASHAN

Hi,

I'm trying to implement a heat map on my ArcGIS viewer using the code posted on the following link:

http://thunderhead.esri.com/readonlyurl/HeatMapNew/srcview/

But still I'm not getting anything running yet as I'm not sure if it's compatible with the Viewer for Flex or not.

Any idea?

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JuliaGalindo

Hi Julia,

You can get the latest compiled versions from the releases section on GitHub (https://github.com/Esri/heatmap-widget-flex/releases). I would start with loading the widget into Application Builder and give that a try.

Hi Lloyd,

Thank you for your answer, I already so it, but I am not familiar with it. I also found some instructions on how to compile it in flash builder (https://github.com/Esri/heatmap-widget-flex/wiki/Flex-Library-Project). But I am getting an error when I double click the project name in the Ant view window.

It says something like: Can�??t resolve <s:SWFLoader> in a component implementation <s:SWFLouder id=�?�swfMessage�?�>

Thanks,

Hi, I am using the flex viewer 3.6 and I didn�??t find this widget compiled for that version. I did found the widget on the Github, but I don�??t know how to make it work from there, I don�??t know how to compile it.

On this link: http://www.arcgis.com/home/item.html?id=43daf0ffb1d34e31ad752da1340aeb40, only found the 3.5 version, which was loaded successfully. So I configured the widget to see my service.

When I preview the application it says 0 features contained. I read all threads here checking possible problems and solutions without been able to solve my problem.

When I open the application in Internet explorer and moxila, it gave me this error

Thank you for the help!

Julia

Hi Julia,

You can get the latest compiled versions from the releases section on GitHub (https://github.com/Esri/heatmap-widget-flex/releases). I would start with loading the widget into Application Builder and give that a try.

JuliaGalindo

Hi, I am using the flex viewer 3.6 and I didn�??t find this widget compiled for that version. I did found the widget on the Github, but I don�??t know how to make it work from there, I don�??t know how to compile it.

On this link: http://www.arcgis.com/home/item.html?id=43daf0ffb1d34e31ad752da1340aeb40, only found the 3.5 version, which was loaded successfully. So I configured the widget to see my service.

When I preview the application it says 0 features contained. I read all threads here checking possible problems and solutions without been able to solve my problem.

When I open the application in Internet explorer and moxila, it gave me this error

Thank you for the help!

Julia

error.JPG

LloydHeberlie

Hi Jack,

I'm having the same issue now of the heatmap being unable to print out in the OOTB print service. May I know if you have managed to get the Alive PDF library to print the heatmap out? If you are able to provide the code for that, it would be great as we're in an urgent state right now.

We are investigating ways we can print the ArcGISHeatMapLayer, stay tuned.

hazelnutz08

Thanks for the reply Lloyd. I'll look into the Alive PDF library to see if that's something we can use.

Jack

Hi Jack,

I'm having the same issue now of the heatmap being unable to print out in the OOTB print service. May I know if you have managed to get the Alive PDF library to print the heatmap out? If you are able to provide the code for that, it would be great as we're in an urgent state right now.

LloydHeberlie

Hi Lloyd!

The result of the weighted heat map looks like what I'm looking for, but doesn't it require an attribute to base the weight on? I don't have such an attribute in my data source. Or would it be possible to use the featureIndexCalculator and somehow calculate a new value based on number of overlapping/nearby points?
Otherwise I guess I have to see if I can modify the data and create a weight attribute.

You are correct, the weighted heat map does require an attribute that is used for calculation. Another option (if you have ArcGIS Desktop) might be to use the "Analysis Tools" -> "Proximity" -> "Near" tool in the Toolboxes to calculate your weighted attribute. This option might be easier and quicker than having to write the client-side code to calculate the "overlapping/nearby points" client side.

mattias_j

Hi Lloyd!

The result of the weighted heat map looks like what I'm looking for, but doesn't it require an attribute to base the weight on? I don't have such an attribute in my data source. Or would it be possible to use the featureIndexCalculator and somehow calculate a new value based on number of overlapping/nearby points?
Otherwise I guess I have to see if I can modify the data and create a weight attribute.

LloydHeberlie

Okay, but what I need to know is what exactly does the output represent? Basically just density of overlapping buffers?

Hi Branden,

The layer represents density and overlapping features. The features that overlap are being blended client-side using the Flash Player's BlendMode effect. If this was not applied you would just see a bunch of overlapping features. If you want more control over the size and color of each feature, see the advanced sample on developers.arcgis.com.

Hope this helps.

LloydHeberlie

When for example using the rainbow colors with the heat map, one single point is displayed with a gradient with all colors from blue to white. And some overlapping points is displayed with the same colors but the gradient is different (more white in the middle) so you can tell the difference. But I wonder if it would be possible to make this difference clearer, if one point for example was displayed with a gradient between the first two colors (blue and green) and it would require another point in the same area for the next color to be included in the gradient. This way the difference between a single point and a few overlapping points would be even clearer than it is now.
Is there a setting for this that I've missed, or would it be possible to achieve this with some minor changes to the code?

Hi Mattias,

Have you seen the Weighted HeatMap sample? Basically it calculates the radius (size or radius of the point) and the index (where to pull the colors from the color palette). I think if you enable the weighted function in the sample and then select the rainbow theme, it might be what you are looking for. These are calculated through the layer's featureIndexCalculator and featureRadiusCalculator functions.

No palette applied:
[ATTACH=CONFIG]26022[/ATTACH]
Rainbow palette applied:
[ATTACH=CONFIG]26023[/ATTACH]

Screen Shot 2013-07-17 at 3.39.54 PM.png

Screen Shot 2013-07-17 at 3.38.16 PM.png

LloydHeberlie

Hi Mattias,

Have you seen the Weighted HeatMap sample? Basically it calculates the radius (size or radius of the point) and the index (where to pull the colors from the color palette). I think if you enable the weighted function in the sample and then select the rainbow theme, it might be what you are looking for. These are calculated through the layer's featureIndexCalculator and featureRadiusCalculator functions.

No palette applied:
[ATTACH=CONFIG]26019[/ATTACH]
Rainbow palette applied:
[ATTACH=CONFIG]26020[/ATTACH]

Hope this helps.

Screen Shot 2013-07-17 at 3.39.54 PM.png.zip

Screen Shot 2013-07-17 at 3.38.16 PM.png.zip

BrandenBelajac

It's actually done on the Client side on-the-fly, if I recall correctly.

Check out https://github.com/Esri/heatmap-widget-flex/blob/develop/src/com/esri/ags/samples/layers/ArcGISHeatMapLayer.as

Okay, but what I need to know is what exactly does the output represent? Basically just density of overlapping buffers?

GISDev1

Thanks for the cool widget!

Can you tell me which geoprocessing tool the widget is actually running? Kernel Density?

Thanks,
Branden

It's actually done on the Client side on-the-fly, if I recall correctly.

Check out https://github.com/Esri/heatmap-widget-flex/blob/develop/src/com/esri/ags/samples/layers/ArcGISHeatMapLayer.as

BrandenBelajac

Thanks for the cool widget!

Can you tell me which geoprocessing tool the widget is actually running? Kernel Density?

Thanks,
Branden

mattias_j

When for example using the rainbow colors with the heat map, one single point is displayed with a gradient with all colors from blue to white. And some overlapping points is displayed with the same colors but the gradient is different (more white in the middle) so you can tell the difference. But I wonder if it would be possible to make this difference clearer, if one point for example was displayed with a gradient between the first two colors (blue and green) and it would require another point in the same area for the next color to be included in the gradient. This way the difference between a single point and a few overlapping points would be even clearer than it is now.
Is there a setting for this that I've missed, or would it be possible to achieve this with some minor changes to the code?

JackJoseph

Hi Jack,

The heat map layer is created using the flash player display engine and client-side layer. Unfortunately there is no easy way to recreate that same layer server side since the algorithms are different from the spatial analyst functionality. There are some other print libraries such as Alive PDF that can create the client side components.

Hope this helps answer your question.

Thanks for the reply Lloyd. I'll look into the Alive PDF library to see if that's something we can use.

Jack

LloydHeberlie

Does anyone know if there is a way to print or export the heatmap using the standard print widget? It seems to disappear during the conversion to PDF, JPG, etc. Is anyone else having this issue or have a workaround?

Thanks!
Jack

Hi Jack,

The heat map layer is created using the flash player display engine and client-side layer. Unfortunately there is no easy way to recreate that same layer server side since the algorithms are different from the spatial analyst functionality. There are some other print libraries such as Alive PDF that can create the client side components.

Hope this helps answer your question.

JackJoseph

Does anyone know if there is a way to print or export the heatmap using the standard print widget? It seems to disappear during the conversion to PDF, JPG, etc. Is anyone else having this issue or have a workaround?

Thanks!
Jack

LloydHeberlie

Hi ALL,
ii try to use this widget with polygon features to represent the developpement of the (vegetation,builts) in many years . Is it Possible.. ?
tnx a lot

Hi Sofie,

Due to the way the custom layer is written and the way that the heatmap code works it requires point features. I simplified the original code base so you can just point the ArcGISHeatMapLayer to a point layer in a map service or feature service. If you don't want to have to write a bunch of custom code, the easiest thing to do would be to create centroid points from your polygon features. If you have ArcGIS for Desktop Advanced (what used to be called ArcInfo), then the "Feature to Point" tool in the "Data Management" toolbox can create polygon centroids (points) for you. You would then publish these points in a service and use that layer.

Hope that helps,

sofialoulad

Hi ALL,
ii try to use this widget with polygon features to represent the developpement of the (vegetation,builts) in many years . Is it Possible.. ?
tnx a lot

LloydHeberlie

Is there a way, or has anyone implemented this widget with a zoom level constraint? I would like to restrict this widget to very tight zoom levels as I'm dealing with a very large set of point data and a limit of only 1000 points on the map service.

Hi James,

Are you thinking that you would just like to be able to set the minScale and maxScale for the layer and only have the layer visible if isInScaleRange returned true? Or were you thinking something more sophisticated?

jamesmullen

Is there a way, or has anyone implemented this widget with a zoom level constraint? I would like to restrict this widget to very tight zoom levels as I'm dealing with a very large set of point data and a limit of only 1000 points on the map service.

AbeHendricks

Hi Abe,

Currently the API sample and widget do not support this functionality. I have another functionality enhancement to the widget that I need to work on, so hopefully I can get this in there as well. I'll let you know when it gets updated.

Glad you like the widget.

I setup the code to allow the user to specify an attribute to be used for the heatmap 'weight' property. It changes the heat, though, I don't really understand what it accomplishes, or what the weight affects. Color? Even though each heatpoint has a different magnitude (in this example), and a different weight, they all draw at the same color.

Do you understand what is happening?

LloydHeberlie

Is there a way to change the radius of the heat per point based on a point attribute (value), such as magnitude of earthquake with the sample provided?

Great widget by the way.

Hi Abe,

Currently the API sample and widget do not support this functionality. I have another functionality enhancement to the widget that I need to work on, so hopefully I can get this in there as well. I'll let you know when it gets updated.

Glad you like the widget.

AbeHendricks

Is there a way to change the radius of the heat per point based on a point attribute (value), such as magnitude of earthquake with the sample provided?

Great widget by the way.

JerryBiedenbender

That is exactly what I want to do but I cant seem to get it to work with my data. Can you take a look at my code and let me know if I have it setup right?

<layers>
        <layer>
            <name>Remaining Service Life (Years)</name>
            <url>http://gis02/ArcGIS/rest/services/Random/GravitySewerValuation/MapServer/1</url&gt;
            <outFields>RSL</outFields>
            <useproxy>false</useproxy>
            <useamf>true</useamf>
            <defaultquery>1=1</defaultquery>
            <querytemplate>RSL = REPLACE_STR</querytemplate>
            <types>RSL &gt;= 0 and RSL &lt;= 5</types>
            <type_descs>Years 0-5</type_descs>
        </layer>
    </layers>

LloydHeberlie

Hello, Excellent widget but i need some help modifying it.

Instead of greater than or equal to... Can I do a "between". I have over 100 years of data and i would like to display it by 5 or 10 years at a time rather than year by year.

Below is an example of how it looks year by year by but if i keep this up the list will be too big.
<querytemplate>RSL = REPLACE_STR</querytemplate>
            <types>0,1,2,3,4,5</types>
            <type_descs>Years = 0,Years = 1,Years = 2,Years = 3,Years = 4,Years = 5</type_descs>
Is there code like this...
<type_descs>Years Between (0&5),Years Between (5&10), Years Between (10&15), Years Between (15&20)</type_descs>
Thanks,
Jerry

Hi Jerry,

Here are a couple of options depending on how you have your data structured.
Option 1:
If your field is a date field and you are using at least ArcGIS 10 for Server then you could use the "time" capability of ArcGIS. The current example allows filtering of the data through enabling "time" on the widget. This will then give you a time slider where you can adjust the time range and filter the data.
Option 2:
You can configure the widget to filter the between ranges such as (Magnitude >= 6 and Magnitude <= 8). Here is what your configuration file would look like.

            <querytemplate>REPLACE_STR</querytemplate>
            <types>Magnitude &gt;= 2 and Magnitude &lt;= 4,Magnitude &gt;= 6 and Magnitude &lt;= 8</types>
            <type_descs>Mag 2-4,Mag 6-8</type_descs>

If your field type is not a number and is instead a string, don't forget to put quotes around the values.

View it Live

If you need to change the user interface or want to go much beyond this, then you'll need to compile the source code on your own (which is provided in the download).

Hope this helps,

JerryBiedenbender

Bringing it to the top.

JerryBiedenbender

I have to top this sorry.

JerryBiedenbender

Hello, Excellent widget but i need some help modifying it.

Instead of greater than or equal to... Can I do a "between". I have over 100 years of data and i would like to display it by 5 or 10 years at a time rather than year by year.

Below is an example of how it looks year by year by but if i keep this up the list will be too big.

<querytemplate>RSL = REPLACE_STR</querytemplate>
            <types>0,1,2,3,4,5</types>
            <type_descs>Years = 0,Years = 1,Years = 2,Years = 3,Years = 4,Years = 5</type_descs>

Is there code like this...

<type_descs>Years Between (0&5),Years Between (5&10), Years Between (10&15), Years Between (15&20)</type_descs>

Thanks,
Jerry

JorgeCrespo

Excellent widget anyway.
Thank you for sharing with us. Great work

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