In a previous post, we covered how to add data to ArcGIS Pro, prepare it for your project needs, time-enable the layer, then share the layer as a time-enabled web layer to an ArcGIS Online organizational site.
This post takes you through the steps to create a web map featuring the time-enabled web layer.
Ready? Let's get started.
You can immediately see that the web layer is time-enabled because a time slider displays at the bottom of the map viewer.
On the map, only the points from a specific time span are displaying.
Each point represents a hostile act against a maritime vessel between 2010 and 2015 in subregion 62, which includes the Gulf of Aden and Arabian Sea (the data is from the U.S. National Geospatial-Intelligence Agency's Maritime Safety Information Portal).
Configure Pop-Ups
When making a web map, you need to decide what information users should see when they click a feature on the map.
Currently, all layer attributes display in the pop-up. Some field names are cryptic or irrelevant to the general audience this map is intended for.
You can configure the pop-up to be more user-friendly.
The pop-up title is currently set to display the layer name followed by the incident reference number. Unless you're familiar with the data, this information isn't easy to understand.
In the Pop-up title box, delete the existing content, then click the plus sign to see the fields list. Click {DateOfOcc}.
Next, configure the pop-up content.
Now the pop-up presents focused information (incident date, victim, and details) that is appropriate for a general audience.
Rethink Layer Styling
On the map, all the incidents are represented with the same symbol. This makes incident distribution easy to see, but suppose you want to communicate more about the piracy victims.
For example, were certain types of vessels targeted more frequently? Were some vessels victimized more frequently in specific years or was the "victim type frequency" consistent throughout the six-year span of the data?
To answer these questions, your first step is to symbolize the incidents based on the Victim attribute. The ArcGIS Online smart mapping feature makes this easy.
The legend in the Change Style pane contains many classes (unique symbols). Why? Because the incident data contains lots of variations on victim type (one example: tanker, chemical tanker, oil tanker). For this map, these type distinctions aren't important.
The map will be easier to interpret if you categorize similar vessel types using one term. One way to accomplish this is to edit the layer's attribute values.
Standardize Attribute Values
Victim values could have been edited in ArcGIS Pro before the shapefile was shared as a web layer. However, it's usually wise to keep source data as-is and make a project copy. Most organizations have standard procedures governing how GIS data is edited. Because this web layer was shared to My Content, editing the attribute values won't affect anyone else's work.
The map now shows only incidents where the victim was a type of tanker.
Now all the Victim values for the filtered records are Tanker.
Repeat the "filter, calculate values, clear selection, remove filter" steps to create eight Victim classes: Tanker, Merchant Vessel, Carrier, Cargo Ship, Container Ship, Dhow, Passenger Vessel, and Fishing Vessel.
Symbolize the Points
Now that you've standardized the victim values, you can symbolize the layer using unique symbols.
You can change the color, size, and shape of individual symbols or all of them if desired. You can also adjust symbol transparency. The default settings are fine for this map.
There are three remaining victim types that don't fit into the standard categories. You can move them into the Other class by selecting their row, then dragging the row down below Other.
Time-Enable the Map
You can adjust settings including the time span duration, start and end times, playback speed, and more. For this map, the time settings are fine.
And there you have it. This web map can be shared as-is or featured in a web app or story map.
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