A layer that can visualize feature data with different visibility, rendering, popup properties, and so on for some or all of the subtypes in an ArcGISFeatureTable. The ArcGISFeatureTable must have an ArcGISFeatureLayerInfo.subtypeField and at least one FeatureSubtype defined, otherwise the layer will fail to load.
Subtypes provide a way to organize your data within an ArcGIS feature table. For example, the streets in a city streets feature table could be categorized into three subtypes - local streets, collector streets, and arterial streets. The benefit of the subtype feature layer is that it allows you to configure different layer properties per subtype. This is particularly useful for data, such as utility networks, in which many different network elements are grouped into a single subtype feature layer.
Functional characteristics The subtype feature layer acts like a group layer that automatically creates one feature layer, or subtype sublayer, for each subtype in the table. Each subtype sublayer can be configured independently of one another. They can have different renderers, label definitions, max and min scales, visibility, layer order in the map, and so on. When a subtype group layer is read from a web map or mobile map, it is represented as a SubtypeFeatureLayer. Saving a map that contains a SubtypeFeatureLayer will save the layer as a subtype group layer. Subtype feature layers are supported in offline maps and will work in offline editing workflows.
Performance characteristics Queries are optimized across all sublayers. For example, a pan of the map sends a single request to the feature table to cover all the sublayers. If you had manually created a feature layer for each subtype, this would have resulted in one query per feature layer.
A SQL expression which limits the features available for query and display on the feature layer. The definition expression string should follow standard SQL syntax as detailed in the SQL reference for query expressions used in ArcGIS[https://pro.arcgis.com/en/pro-app/latest/help/mapping/navigation/sql-reference-for-elements-used-in-query-expressions.htm] document.
Defines how features are filtered from the display. Use this property to reduce the number of features displayed in the map or scene view. The filter aims to improve data visualization and optimize rendering performance. It only affects the display of features so all features are still available for query methods such as FeatureLayer.selectFeatures(QueryParameters, SelectionMode): Future
Defines the properties that allow a layer to be floor-aware. When a layer is configured as floor-aware, it has a FloorAware.floorDefinition property that defines properties that allow a layer to be floor-aware. When it is null (default value) the specific layer does not support floor filtering.
The unique identifying string for the layer, for example specified in a map or scene. The id is used by other parts of this API to refer to a specific Layer, such as in a set of FeatureFenceParameters or a FacilityLayerDefinition. If not supplied, all layers will be assigned a unique id when created.
The mode defines how the feature layer is rendered. FeatureRenderingMode.Static mode is better suited for displaying large datasets (in terms of the number of vertices) and for complex symbology because it does not update the layer's display while pan/zoom operations are in progress.
True if the layer's symbols and labels honor the map's reference scale, otherwise false. If the map has a positive reference scale, and the layer honors it, then symbols and labels are drawn at their specified size when the viewing scale is the same as the reference scale. They will grow or shrink as the view zooms in or out, to keep the symbol a fixed size on the map. If the map has no reference scale, the reference scale is zero, or this feature layer's scaleSymbols property is false, then the symbols and labels will be drawn at their fixed screen size.
Unknown data from the source JSON. Unknown JSON is a dictionary of values not defined in the ArcGIS specification used to create this object but found in the source JSON. If the object is written back to JSON, any unknown JSON data is not persisted. The ArcGIS specification may be for a web map, web scene, REST API, and so on.
Unsupported data from the source JSON. Unsupported JSON is a dictionary of values defined in the ArcGIS specification used to create this object but not currently used in this API. If the object is written back to JSON, any unsupported JSON data is persisted. The ArcGIS specification may be from a web map, web scene, REST API, and so on.
Returns the layer content's effective visibility at the specified scale. Returns the effective layer content visibility. This effective visibility takes care of the effective visibility of the parents at the specified scale. Will return false if an error occurs.
Selects the given features and adds them to the current collection of selected features. Use the FeatureLayer.getSelectedFeatures(): Future
Selects the features that match the criteria in the QueryParameters object and adds them to the current collection of selected features.