topic Re: Demographic Layer question. in ArcGIS JavaScript Maps SDK Questions

Demographic Layer question.

DanielMclaglen1 — Thu, 14 May 2015 12:17:55 GMT

I have a situation where I want to add an Esri created demograhics layer to my map via jScript and I am not sure on how best to do this or which objects to use (Feature layer, ArcGISDynamicMapServiceLayer or an other).

I can get the "base layer" to load using the following code

var demographicsLayerURL = "https://demographics5.arcgis.com/arcgis/rest/services/USA_Demographics_and_Boundaries_2015/MapServer";

var demographicsLayer = new ArcGISDynamicMapServiceLayer(demographicsLayerURL);

mapresponse.addLayer(demographicsLayer);

This works to load the "base layer" but what I am trying to do is load it as a layer showing "Unemployment figures". When I look at the URL for the Unemployment figures it looks like this

"https://demographics5.arcgis.com/arcgis/rest/services/USA_Demographics_and_Boundaries_2015/MapServer?ts=[SOMEID]"

In effect I simply want to add the below layer to my map in jScript.

http://www.arcgis.com/home/item.html?id=3c7feb94f97c47929292698b3544f07e

Apologies if this is not clear.

Ta,

Re: Demographic API question.

TimWitt2 — Thu, 14 May 2015 12:38:22 GMT

Daniel,

I would just add this specific layer as a feature layer. Which makes it available for click events and such.

FeatureLayer | API Reference | ArcGIS API for JavaScript

Tim

Re: Demographic Layer question.

DanielMclaglen1 — Thu, 14 May 2015 12:46:14 GMT

Hi Tim

Yup I thought feaure layer might be the ticket however how do I figure out what the URL is?

I have tried the URL with the appended query string of ?ts=[SOMEID] but with no joy.

Also tried using this as the URL : http://www.arcgis.com/home/item.html?id=3c7feb94f97c47929292698b3544f07e

Thanks for taking the time to respond.

Re: Demographic Layer question.

TimWitt2 — Thu, 14 May 2015 12:48:27 GMT

On what level do you want to show this data, block/county/state?

Re: Demographic Layer question.

DanielMclaglen1 — Thu, 14 May 2015 12:52:37 GMT

Any will do at this stage as just want to show it as a POC.

Realised I had the wrong item in the original post and this is the actual one : http://www.arcgis.com/home/item.html?id=47854b8eccbf40e1a324dbebc83ba9d4

Pretty similar layer to the other one.

Re: Demographic Layer question.

TimWitt2 — Thu, 14 May 2015 12:56:45 GMT

Let me give you a layer for each stage:

State: http://demographics5.arcgis.com/arcgis/rest/services/USA_Demographics_and_Boundaries_2015/MapServer/23

County: http://demographics5.arcgis.com/arcgis/rest/services/USA_Demographics_and_Boundaries_2015/MapServer/20

Block: http://demographics5.arcgis.com/arcgis/rest/services/USA_Demographics_and_Boundaries_2015/MapServer/4

The field to look for is: UNEMPRT_CY this is the unemployment rate field.

Re: Demographic Layer question.

DanielMclaglen1 — Thu, 14 May 2015 13:06:58 GMT

Ok ok I see but where on earth are you look to get the additional ID's from?

Are you looking in here : https://demographics5.arcgis.com/arcgis/rest/services/USA_Demographics_and_Boundaries_2015/Mapserver

When I click on things in here I get infinite loop re-directs.

How would also know that UNEMPRT_CY is the unemployment rate field (at the moment I can't even see where this is and how you map that back to and ID).

Ta,

Re: Demographic Layer question.

TimWitt2 — Thu, 14 May 2015 13:13:49 GMT

Here is the list of all layers:

http://demographics5.arcgis.com/arcgis/rest/services/USA_Demographics_and_Boundaries_2015/MapServer?ts=1428453233430

When you click on one of the layers just use control + f and type in unemploy to find the field you need.

Tim

Re: Demographic Layer question.

DanielMclaglen1 — Thu, 14 May 2015 13:21:48 GMT

Hi Tim

Right ok now explains why I can't find it as when I goto that link my browser just goes into infinite loop redirects so that page never opens for me.

I have tried both Chrome and IE and on multiple machines. What happens is it redirects to login page, I login and then into the infinite loop redirects.

No idea why this happens.

Ta,

Re: Demographic Layer question.

TimWitt2 — Thu, 14 May 2015 13:29:26 GMT

You need an organizational or developer account to access this data. You wont be able to use it with a free ArcGIS Online account.

Re: Demographic Layer question.

DanielMclaglen1 — Thu, 14 May 2015 13:32:34 GMT

Attached what happens to my poor old browser when using the link -- no idea what is causing this little gem of a behaviour 😉

I have a paid for account.

Re: Demographic Layer question.

TimWitt2 — Thu, 14 May 2015 13:42:30 GMT

If you go to this link: http://www.arcgis.com/home/item.html?id=3c7feb94f97c47929292698b3544f07e

In the top sign into your organizational account. Once signed in, click on the link below 2015 USA Unemployment Rate:

Which worked for me.

Re: Demographic Layer question.

DanielMclaglen1 — Thu, 14 May 2015 13:43:35 GMT

I now can't even access the basic rest api link for the demographic layers without the browser going to "spastic mode".

I have tried on different machines so it has to be a problem with the account. Will try another account.

Ta,

Re: Demographic Layer question.

DanielMclaglen1 — Thu, 14 May 2015 13:48:26 GMT

Nope browser just goes into an infinite loop when accessing this

http://demographics5.arcgis.com/arcgis/rest/services/USA_Demographics_and_Boundaries_2015/MapServer

Previously I could get to the above link but could not get to the one with the query string ts appended.

I can however access this link Layer: Light Gray Canvas Base (ID: 0)

Driving me round the bend this is now 😉

Might have to raise a support ticket as this is BS.

Ta,

Re: Demographic Layer question.

TimWitt2 — Thu, 14 May 2015 14:08:35 GMT

I had the same issue, but once I signed into my developer account I was good to go.