Browse an OGC API feature service for layers and add them to the map.
Use case
OGC API standards are used for sharing geospatial data on the web. As an open standard, the OGC API aims to improve access to geospatial or location information and could be a good choice for sharing data internationally or between organizations. That data could be of any type, including, for example, transportation layers shared between government organizations and private businesses.
How to use the sample
Select a layer to display from the list of layers shown in an OGC API service. The Daraa data is used as the default feature service, however, alternative feature services can be used.
How it works
- Create an
OgcFeatureServiceobject with a URL to an OGC API feature service. - Obtain the
OgcFeatureServiceInfofromOgcFeatureService.serviceInfo. - Create a list of feature collections from the
OgcFeatureServiceInfo.featureCollectionInfos. - When a feature collection is selected, create an
OgcFeatureCollectionTablefrom theOgcFeatureCollectionInfo. - Populate the
OgcFeatureCollectionTableusingpopulateFromService(...)withQueryParametersthat contain amaxFeaturesproperty. - Create a feature layer from the feature table.
- Add the feature layer to the map.
Relevant API
- OgcFeatureCollectionInfo
- OgcFeatureCollectionTable
- OgcFeatureService
- OgcFeatureServiceInfo
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
browse, catalog, feature, layers, OGC, OGC API, service, web
Sample Code
/* Copyright 2025 Esri * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * */ package com.esri.arcgismaps.sample.browseogcapifeatureservice.components import android.app.Application import androidx.compose.runtime.getValue import androidx.compose.runtime.mutableStateOf import androidx.compose.runtime.setValue import androidx.lifecycle.AndroidViewModel import androidx.lifecycle.viewModelScope import com.arcgismaps.Color import com.arcgismaps.data.FeatureRequestMode import com.arcgismaps.data.OgcFeatureCollectionTable import com.arcgismaps.data.QueryParameters import com.arcgismaps.geometry.GeometryType import com.arcgismaps.geometry.Point import com.arcgismaps.geometry.SpatialReference import com.arcgismaps.mapping.ArcGISMap import com.arcgismaps.mapping.BasemapStyle import com.arcgismaps.mapping.Viewpoint import com.arcgismaps.mapping.layers.FeatureLayer import com.arcgismaps.mapping.layers.OgcFeatureCollectionInfo import com.arcgismaps.mapping.layers.OgcFeatureService import com.arcgismaps.mapping.symbology.SimpleFillSymbol import com.arcgismaps.mapping.symbology.SimpleFillSymbolStyle import com.arcgismaps.mapping.symbology.SimpleLineSymbol import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle import com.arcgismaps.mapping.symbology.SimpleRenderer import com.arcgismaps.toolkit.geoviewcompose.MapViewProxy import com.esri.arcgismaps.sample.sampleslib.components.MessageDialogViewModel import kotlinx.coroutines.flow.MutableStateFlow import kotlinx.coroutines.flow.StateFlow import kotlinx.coroutines.flow.asStateFlow import kotlinx.coroutines.launch class BrowseOgcApiFeatureServiceViewModel(app: Application) : AndroidViewModel(app) { val mapViewProxy = MapViewProxy() // Message dialog for error handling val messageDialogVM = MessageDialogViewModel() var arcGISMap = ArcGISMap(BasemapStyle.ArcGISTopographic).apply { initialViewpoint = Viewpoint( center = Point(x = 36.10, y = 32.62, spatialReference = SpatialReference.wgs84()), scale = 200000.0 ) } // The current OGC API feature service URL var ogcServiceUrl by mutableStateOf("https://demo.ldproxy.net/daraa") private set // The list of available feature collection info titles private val _featureCollectionTitles = MutableStateFlow<List<String>>(emptyList()) val featureCollectionTitles: StateFlow<List<String>> = _featureCollectionTitles.asStateFlow() // Map of title to OgcFeatureCollectionInfo private val featureCollectionInfos = mutableMapOf<String, OgcFeatureCollectionInfo>() // The currently selected feature collection title var selectedTitle by mutableStateOf("") private set // Show/hide the input dialog for entering a new OGC API URL var isUrlDialogVisible by mutableStateOf(false) private set // The text input for the OGC API URL dialog var urlInputText by mutableStateOf("https://demo.ldproxy.net/daraa") private set // The OGC API feature service instance private var ogcFeatureService: OgcFeatureService? = null /** * Loads an OGC API feature service from the given [url]. */ fun loadOgcFeatureService(url: String) { viewModelScope.launch { ogcFeatureService = OgcFeatureService(url) ogcFeatureService?.load()?.onSuccess { val serviceInfo = ogcFeatureService?.serviceInfo val infos = serviceInfo?.featureCollectionInfos ?: emptyList() // Map titles to info objects, discarding duplicates featureCollectionInfos.clear() infos.forEach { info -> if (!featureCollectionInfos.containsKey(info.title)) { featureCollectionInfos[info.title] = info } } _featureCollectionTitles.value = featureCollectionInfos.keys.toList() // Set the selected title to the first available selectedTitle = featureCollectionTitles.value.firstOrNull() ?: "" // Display the first layer if available selectedTitle.takeIf { it.isNotEmpty() }?.let { title -> displayLayerForTitle(title) } }?.onFailure { messageDialogVM.showMessageDialog( title = "Failed to load OGC API feature service", description = it.message.toString() ) } } } /** * Loads and displays the feature layer for the given feature collection [title]. */ private fun displayLayerForTitle(title: String) { val info = featureCollectionInfos[title] ?: return viewModelScope.launch { // Remove all operational layers arcGISMap.operationalLayers.clear() // Create the OGC feature collection table val ogcFeatureCollectionTable = OgcFeatureCollectionTable(info) ogcFeatureCollectionTable.featureRequestMode = FeatureRequestMode.ManualCache // Populate the table with up to 1000 features val queryParams = QueryParameters().apply { maxFeatures = 1000 } ogcFeatureCollectionTable.populateFromService(queryParams, clearCache = false).onSuccess { // Create the feature layer val featureLayer = FeatureLayer.createWithFeatureTable(ogcFeatureCollectionTable) // Set a renderer based on geometry type featureLayer.renderer = createRendererForGeometryType(ogcFeatureCollectionTable.geometryType) arcGISMap.operationalLayers.add(featureLayer) info.extent?.let { envelope -> mapViewProxy.setViewpointAnimated(Viewpoint(boundingGeometry = envelope)) } }.onFailure { messageDialogVM.showMessageDialog( title = "Failed to populate OGC feature collection table", description = it.message.toString() ) } } } /** * Creates a SimpleRenderer with a symbol appropriate for the given [geometryType]. */ private fun createRendererForGeometryType(geometryType: GeometryType?): SimpleRenderer? { return when (geometryType) { GeometryType.Point, GeometryType.Multipoint -> SimpleRenderer( SimpleMarkerSymbol( style = SimpleMarkerSymbolStyle.Circle, color = Color.blue, size = 5f ) ) GeometryType.Polyline -> SimpleRenderer( SimpleLineSymbol( style = SimpleLineSymbolStyle.Solid, color = Color.blue, width = 1f ) ) GeometryType.Polygon, GeometryType.Envelope -> SimpleRenderer( SimpleFillSymbol( style = SimpleFillSymbolStyle.Solid, color = Color.blue ) ) else -> null } } /** * Called when the user selects a new feature collection title. */ fun onFeatureCollectionTitleSelected(title: String) { selectedTitle = title displayLayerForTitle(title) } /** * Called when the user requests to open the OGC API URL dialog. */ fun onOpenUrlDialog() { isUrlDialogVisible = true urlInputText = ogcServiceUrl } /** * Called when the user cancels the OGC API URL dialog. */ fun onCancelUrlDialog() { isUrlDialogVisible = false urlInputText = ogcServiceUrl } /** * Called when the user confirms a new OGC API URL. */ fun onConfirmUrlDialog() { isUrlDialogVisible = false ogcServiceUrl = urlInputText loadOgcFeatureService(ogcServiceUrl) } /** * Called when the user edits the OGC API URL input text. */ fun onUrlInputTextChanged(newText: String) { urlInputText = newText } } // Extension property to provide blue color for ArcGISMaps Color class val Color.Companion.blue: Color get() = fromRgba(0, 0, 255, 255)