Select ENC features

Select features in an ENC layer.

Use case

You can use selection to identify a feature and learn more about it. ENC layers often have many overlapping features, and features of mixed geometry, in a single layer, so the sample includes code for identifying the smallest feature, which is taken to be the most relevant.

How to use the sample

Tap to select ENC features. Feature properties will be displayed in a callout.

How it works

1. Load and display the ENC layer.
2. When the map view is tapped, call mapView.IdentifyLayersAsync(), specifying the tapped position, a tolerance, and false for the popupsOnly parameter.
3. Filter the list of identified layers to include only results where the LayerContent is an EncLayer.
4. Get the first result with at least one feature.
5. Get the first feature in the IdentifyLayerResult.
6. Select that feature by calling identifyResult.LayerContent.SelectFeature(firstFeature).
7. Show the feature's acronym and description in a callout.

Relevant API

• EncFeature
• EncFeature.Acronym
• EncFeature.Description
• EncLayer
• GeometryEngine.Area
• IdentifyLayerResult
• IdentifyLayerResult.GeoElements
• IdentifyLayerResult.LayerContent

Offline data

This sample downloads the following items from ArcGIS Online automatically:

• ENC Exchange Set without updates

About the data

The sample uses ENC Exchange Set without updates a mock ENC data set, available on ArcGIS Online.

Tags

chart, hydrography, identify, IHO, maritime, S-57, S57, select, selection

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