Add feature collection layer from table

Create a feature collection layer from a feature collection table, and add it to a map.

Use case

A Feature Collection allows easily importing external data (such as CSV files), as well as creating custom schema for data that is in non-standardized format. This data can then be used to populate a Feature Collection Table, and displayed in a Feature Collection Layer using the attributes and geometries provided in the external data source. For example, an electricity supplier could use this functionality to visualize existing location data of coverage areas (polygons), power stations (points), transmission lines (polylines), and others.

How to use the sample

When launched, this sample displays a FeatureCollectionLayer with a Point, Polyline and Polygon geometry. Pan and zoom to explore the scene.

How it works

1. Create a FeatureCollectionTable for the Point, Polyline, and Polygon geometry types.
   1. Create the schema for each feature collection table by creating an array of Fields.
   2. Create a FeatureCollectionTable with the fields created.
   3. Create a SimpleRenderer from various symbols.
   4. Create a new feature using makeFeature(attributes:geometry:).
   5. Add the feature to the FeatureCollectionTable.
2. Create a FeatureCollection from the FeatureCollectionTables.
3. Create a FeatureCollectionLayer using the tables.
4. Add the feature collection layer to the map’s operational layers.

Relevant API

• Feature
• FeatureCollection
• FeatureCollectionLayer
• FeatureCollectionTable
• Field
• SimpleRenderer

Tags

collection, feature, layers, table