Summarize Point data using Aggregate Points in Polygon in ArcGIS Online

This post will demonstrate how to use our web based GIS application software-ArcGIS Online to summarize Point data as well as visualizing the aggregate points in each polygon feature on a map.

For sample data to practice, Click this link to download this zipped shapefiles: GrazingSpots.ZIP, West Africa.ZIP
(Kindly attribute this data to www.mapsnigeriainitiative.wordpress.com)

Sign into ArcGIS Online account (You must be subscribing to an organizational account to be able to perform analysis in ArcGIS Online). Click on Map to open a new map.


Let us look at our data in the Contents window. We have a Point feature layer- Grazingspots-which represent major grazing spots within the geographical extent. Below is a polygon map comprising the different countries that make up the West African sub-region.
Our task is to summarize the number of points per polygon and visualize this result on the map using ArcGIS Online.


Click on Analysis (red box 1). The Perform Analysis window will open, then click on Summarize Data (red box 2) and under it click on Aggregate Points (red box 3).


In Option 2, we select the polygon layer as that is the layer containing the countries. Option3- Add statistics and its an optional field. For the demo, the dataset contains information on the numerical sizes of the livestock at the mapped grazing spots. Headcount represents the numerical size in the wet months and Drycount in the dry months when migration to the south takes place. Click RUN ANALYSIS


The new layer-Summarize (red boxed) is added. The different circles represent the total number of points per polygon -the bigger the circle translates to a greater number of Points in Polygon. To create the visualization, Click on the ….. beside the layer and choose Create Labels.


The Label Features window will open. Select the appropriate attribute field for labeling the features. The Label size, color and font attributes can be edited. Click OK


The Cluster markers are now labelled and displayed on the map in the screenshot below.



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Publishing FEATURE layers in arcmap as a feature service in ArcGIS online

Task
This short demonstration shows how to share a map or feature layer with ArcGIS online as a feature service.Our map –Selection by Location Demonstration was put together in ArcMap 10.2. The demo will illustrate how to share the map feature layers- Streets, Parcels, Low, Medium and High Tariff Blocks layers to ArcGIS Online as a  Feature layer/service.

ArcMAp must be connected to ArcGIS Online resources. USER MUST BE CONNECTED TO THE INTERNET

Note- This process can only be done by an organizational account holder. See our post titled- Lets look at ArcGIS Online… for more details about ESRI ArcGIS Online accounts.

Procedure
In ArcMap 10.2. Add the feature layers that make up the map. The demo has five layers. Go to File > Sign in. Sign into ArcGIS Online.


Go to File> Share As > Service.


This dialog box will pop up. Pick Publish a service.

Choose the connection that indicates the username for the organizational account. The default is to choose the name of the map in arcmap but the User can change it.


In the next dialog box, Click on the capablities –Choose - Feature access (red box)–instead of tile mapping. Item description (green box) describe the feature service, tag it and give a summary.



Click on sharing and select everyone in organization and public.



Click Publish (red box). During the publishing process, the system might identify errors and pause the process so the User can be correct them. Correct as many as possible and continue to publish.



The contents are transferred online, server side processing and a message box indicating that the service was published.



Sign into ArcGIS Online and Go to MY CONTENT (red box) to check the feature layer.



In the default folder, the feature layer and service definition layer should be present, For the demo, the feature layer is green boxed.

Adding custom map tiles from Stamen as Tile layers in ArcGIS Online

Adding custom base maps gives the user the freedom to place layers on base maps generated from other sources. For the demo. the source of our custom base map is from Stamen maps.  Browse to maps.stamen.com and have a look at the several types of map styles available.
*Tile layers must be hosted online.

Steps

1) First we prepare a custom image at maps.stamen.com

This is the home page.


Click on Find (cursor finger). For the demo, the area of interest is abuja, Nigeria (stated in the search box).


There are options of map styles to select from- Toner, Watercolor and Terrain. For the demo, Watercolor is selected (see cursor finger position).


Zoom in to the area of interest where user is particular about.


Click on to allow the crop tool to be activated on the map.


Use the yellow rectangular box to clip out the extent of map. In the red boxed area in the upper part of the screenshot, select the map style and the image size.
For the demo, watercolor is the map style and 400 by 400 pixel size. Click on MAKE.


Once the process of creating the image is complete, the finished image will appear on the right pane. Click on the image (see cursor finger position).


The image will be displayed along with details on size, time created and the geographical coordinate extents.


Right Click on the image and scroll down to click on ‘Copy Image Location’ (see position of cursor finger).


2) Add the Custom image as Base map in ArcGIS online

Open ArcGIS online > On home page click on MAPS to open a new map.
Go to Add > Add Layers from Web.


In the Add Layer from Web window, Select A Tile Layer in the drop down list.


Paste the URL of the Stamen image copied earlier. Check the Use as Basemap option. Click ADD LAYER button.


The Tile layer is added as base map in ArcGIS online.


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Adding custom tile layers as base maps in ArcGIS Online

CLICK ON THIS LINK TO WATCH THE YOUTUBE VIDEO DEMO OF THIS POST

In certain instances, the user may want to display a custom map as the base map for a web map instead of the generic ones available on the web mapping application. This post will demonstrate how to add a custom map or Tile layer as a base map in ArcGIS Online.

Things to note.
- Tile layers or maps are raster layers or maps configured or rendered in such a manner that enables them to be viewed on the web.
- Tile layers are always hosted on a server capable of rendering data as maps and images.

Task
To Add a Tile Layer to an ArcGIS Online using it as the base map for a map.

Procedure
Sign into ArcGIS Online account. Go to MAP to open a new map.



Go to Add > Add Layer from Web. * Tile layers must be hosted on a map server



In the pop up window, go to the drop down list and select A Tile Layer.



Input the URL of the hosted Tile layer and check the option Use as Basemap. Give the layer a title, credits and also SET TILE COVERAGE. Then Click ADD LAYER



The layer, Dam Map, is added as the base map and the layer comes in as several tiles beside each other (Red box, yellow box).



Use the Zoom in/Zoom out buttons (+ and – in red box) to adjust until the zoom creates just one layer.


Go to the Save icon > Save As to save the map.


Save Map. Fill in the details in the window.


The map is now saved using a custom tile layer as the base map.


Thanks for visiting the blog and hope you enjoyed the post.

Creating and Publishing a Simple web map using ArcGIS online

Steps
- We will download our data from a GPS receiver as Tracks
- Import the Tracks as GPX file into ArcGIS Online.
- Design the Web map.
- Share the web Map.
-Embed the web map in a web page.

Procedure

1. Connect the GPS receiver via USB port. Launch DNR GPS and make sure it connects to the GPS. Go to GPS > Download All. We will be working with the Tracks downloaded from the GPS receiver( red box). Go to File>Save To>File and save the Tracks as field work.gpx.


2. Launch ArcGIS Online and sign in. In the home page, click on MAP (red boxed).


3. When the map page opens, Go to Add > Add Layer from File.


4. This dialog box will come. Click browse to navigate to where the gpx file is. Then when the file is uploaded, click IMPORT LAYER.


5. The file field work.gpx is imported in as three polygons almost on top of each other. Notice the Change Style window is opened immediately so the Symbol Style can be edited.


6. Here we choose the single symbol using the ident as the attribute to show. Our tracks are T1, T15 and T3 as in the GPS where the data was downloaded from.


7. The pop up window that displays information on the feature can be re-configured. Click on the button to the right of the feature > Configure Pop –up


8. The fields that contain info we don’t require the audience to see can be unchecked. Once unchecked in this Configure Attributes window, it won’t appear on the pop window display.


9.In this window, we will also add an image to the pop-up window display. Since we grouped all our polygons into a single symbol, all the pop windows will share the same pix. Click on Add>Image.


10. A configure image dialog box allows us to fill the details. Note that the image must be hosted online and the url of the image should be supplied as below.


11. Click on the feature and the pop up window should reflect the saved changes.


12. The next thing is to save the map. Click on Save on the main menu. The Save Map window will pop out. Fill in the details and click SAVE MAP.


13. Next we publish the web map we just created. Click on Share on the main menu. The Share dialog window opens up. Check everyone (public) in red box and a link to the map will appear in the window (green box). Click on the EMBED IN WEBSITE


14. The Embed in Website window will come up. The HTML code will appear in the open window (red box). Right click on it and Copy.


15. Insert the HTML code into the source code of the web page. See the HTML code in blue highlight.


16.Launch the web page and the web map will come up. See the url of the web page in the browser (red boxed). The web map is dynamic and interactive.