Identify features in all layers in a map.
Use case
“Identify layers” operation allows users to tap on a map, returning features at that location across multiple layers. Because some layer types have sublayers, the sample recursively counts results for sublayers within each layer.
How to use the sample
Tap to identify features. The text overlay will update to show all layers with features under the tapped location, as well as a layer count.
How it works
- The tapped position is passed to
MapViewProxy.identifyLayers(screenPoint:tolerance:returnPopupsOnly:maximumResultsPerLayer:)method. - For each
IdentifyLayerResultin the results, features are counted.- Note: there is one identify result per layer with matching features; if the feature count is 0, that means a sublayer contains the matching features.
Relevant API
- IdentifyLayerResult
- LayerContent
Additional information
The GeoView supports two methods of identify: identifyLayer, which identifies features within a specific layer and identifyLayers, which identifies features for all layers in the current view.
Tags
identify, recursion, recursive, sublayers