What are areas of interest

Areas of interest define spatial areas which:

  • Are shown on the spatial map on the Visual Analytics page

  • Can be used as spatial filter while doing analytics

  • Can be used as area to compute statistics

Not sure whether you are looking for an area of interest layer ?

See the Introduction to data management article for an overview of the different types of data resources you can use in a project.

How to create a new area of interest layer

Step 1: Navigate to the 'New area of interest' page

by first clicking on the Areas of interest button in the left navigation bar

Figure 1. The Areas of interest button in the navigation bar

and then on the Add areas of interest button in the top right corner of the Areas of interest page.

Figure 2. The Add areas of interest button in the top right corner of the Areas of interest page

Step 2: Upload your GeoJSON file

by either drag-and-dropping the file onto the GeoJSON drop area

Figure 3. The drag and drop area

or by clicking the drag-and-drop area to select a file through a file chooser

Upload your Areas of interest

Step 3 (optional): Edit properties and filters

At this point, your background layer is already created and available. If needed, you can edit the properties and filters.

  • The name of the background layer is used in the UI when we need to refer to that layer

  • The description of the background layer is shown on the overview page with all the background layers. This is a good location to add some more details about this layer.

You can use HTML tags in the description

The description supports a subset of HTML tags. You can for example use it to

  • add links in the description using the <a> tag

  • make parts of the description stand out by typesetting them in bold (<b>) or italics (<i>)

  • The area display name property is the property in the GeoJSON data used to label the data when shown on the map.

    For example if you have a GeoJSON file containing all countries in the world, and the GeoJSON data has properties like name, continent, population, you could select the name property as area display name property. When the data is visualized with labeling enabled, both the shapes of the countries and the name are displayed.

    Figure 4. Two maps: labeled vs non-labeled GeoJSON layer
  • The distance threshold is allows to increase the size of the shapes.

    For point data, a non-zero distance threshold will convert the points to a circular area of interest with the specified distance as radius.

    For polygon data, it is a threshold distance to expand the area by the given amount of meters. This can be useful, for example, when analyzing foot traffic surrounding an exhibition booth.

  • Remove certain features by defining a filter.

    When your GeoJSON data has properties, you can only include the features or shapes of which the properties match your filter. Changes made to the filter will be previewed immediately.

    For example if you have a GeoJSON file containing all countries in the world, and the GeoJSON data has properties like name, continent, population, you can define a filter to include the countries of Europe with a population above 20 million people.

    Figure 5. The Areas of interest settings

After you have changed the settings, press the Save button to apply them.

You can always edit these settings later

You can always adjust these settings at a later time:

  1. Click the Background layers button in the left navigation bar

  2. Find the card of the background layer you want to edit

  3. Press the edit button, which will take you back to this page

Drawing areas of interest on the map

You can always draw new areas of interest on the spatial map on the Visual Analytics page in case you don’t have a GeoJSON file with the areas you are interested in.