Add an ENC Exchange Set

This sample demonstrates how to load an ENC Exchange Set, including its component cells.

Add ENC Exchange Sets

Instructions

This sample automatically downloads ENC data from ArcGIS Online before displaying the map.

Code

// Copyright 2017 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.

using ArcGISRuntimeXamarin.Managers;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Hydrography;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using System;
using System.Collections.Generic;
using System.IO;
using System.Threading.Tasks;
using UIKit;

namespace ArcGISRuntimeXamarin.Samples.AddEncExchangeSet
{
    [Register("AddEncExchangeSet")]
    public class AddEncExchangeSet : UIViewController
    {
        // Create and hold reference to the used MapView
        private MapView _myMapView = new MapView();

        public AddEncExchangeSet()
        {
            Title = "Add an ENC exchange set";
        }

        private async void Initialize()
        {
            // Initialize the map with an oceans basemap
            _myMapView.Map = new Map(Basemap.CreateOceans());

            // Get the path to the ENC Exchange Set
            string encPath = await GetEncPath();

            // Create the Exchange Set
            // Note: this constructor takes an array of paths because so that update sets can be loaded alongside base data
            EncExchangeSet myEncExchangeSet = new EncExchangeSet(new string[] { encPath });

            // Wait for the layer to load
            await myEncExchangeSet.LoadAsync();

            // Store a list of data set extent's - will be used to zoom the mapview to the full extent of the Exchange Set
            List<Envelope> dataSetExtents = new List<Envelope>();

            // Add each data set as a layer
            foreach (EncDataset myEncDataSet in myEncExchangeSet.Datasets)
            {
                EncLayer myEncLayer = new EncLayer(new EncCell(myEncDataSet));

                // Add the layer to the map
                _myMapView.Map.OperationalLayers.Add(myEncLayer);

                // Wait for the layer to load
                await myEncLayer.LoadAsync();

                // Add the extent to the list of extents
                dataSetExtents.Add(myEncLayer.FullExtent);
            }

            // Use the geometry engine to compute the full extent of the ENC Exchange Set
            Envelope fullExtent = GeometryEngine.CombineExtents(dataSetExtents);

            // Set the viewpoint
            _myMapView.SetViewpoint(new Viewpoint(fullExtent));
        }

        private void CreateLayout()
        {
            // Add MapView to the page
            View.AddSubviews(_myMapView);
        }

        public override void ViewDidLoad()
        {
            CreateLayout();
            Initialize();

            base.ViewDidLoad();
        }

        public override void ViewDidLayoutSubviews()
        {
            // Setup the visual frame for the MapView
            _myMapView.Frame = new CoreGraphics.CGRect(0, 0, View.Bounds.Width, View.Bounds.Height);

            base.ViewDidLayoutSubviews();
        }

        private async Task<String> GetEncPath()
        {
            #region offlinedata

            // The data manager provides a method to get the folder
            string folder = DataManager.GetDataFolder();

            // Get the full path - the catalog is within a hierarchy in the downloaded data;
            // /SampleData/AddEncExchangeSet/ExchangeSet/ENC_ROOT/CATALOG.031
            string filepath = Path.Combine(folder, "SampleData", "AddEncExchangeSet", "ExchangeSet", "ENC_ROOT", "CATALOG.031");

            // Check if the file exists
            if (!File.Exists(filepath))
            {
                // Download the file
                await DataManager.GetData("9d3ddb20afe3409eae25b3cdeb82215b", "AddEncExchangeSet");
            }

            return filepath;

            #endregion offlinedata
        }
    }
}


In this topic
  1. Instructions
  2. Code