Display OGC API collection

Display an OGC API feature collection and query features while navigating the map view.

Use case

When panning the map view, it may be necessary to query the OGC API feature table for additional features within the new visible extent.

How to use the sample

Pan the map and see how new features are loaded from the OGC API feature service.

How it works

1. Create an OGCFeatureCollectionTable object using a URL to an OGC API feature service and a collection ID.
2. Set the feature table’s featureRequestMode property to manualCache.
3. Create a FeatureLayer using the feature table and add it to the map view.
4. Create a default QueryParameters object.
   • Set the parameter’s spatialRelationship property to intersects.
   • Set the maxFeatures property to 5_000 (some services have a low default value for maximum features).
5. Every time the map view navigation completes:
   • Set the parameter’s geometry to the current extent of the map view.
   • Call OGCFeatureCollectionTable.populateFromService(using:clearCache:outFields:queryLanguage:) using the query parameters.

Relevant API

• OGCFeatureCollectionTable
• QueryParameters

About the data

The Daraa, Syria test data is OpenStreetMap data converted to the Topographic Data Store schema of NGA.

Additional information

See the OGC API website for more information on the OGC API family of standards.

Tags

feature, feature layer, feature table, OGC, OGC API, service, table, web