Set initial map location

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Display a basemap centered at an initial location and scale.

Image of set initial map location

Use case

You can set a map's initial location when you want to highlight a particular feature or area to establish the context.

How to use the sample

When the map loads, note the specific location and scale of the initial map view.

How it works

  1. Create a Map, specifying a basemap type, latitude and longitude in WGS84, and a level of detail.
  2. Display the map in a map view.

Relevant API

  • BasemapType
  • Map
  • MapView

About the data

The map opens with satellite imagery of a guitar-shaped field in the Pampas region of north central Argentina.

Tags

basemap, center, envelope, extent, initial, lat, latitude, level of detail, location, LOD, long, longitude, scale, zoom level

Sample Code

SetInitialMapLocation.cs
                                                                   
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// Copyright 2016 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 Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using UIKit;

namespace ArcGISRuntime.Samples.SetInitialMapLocation
{
    [Register("SetInitialMapLocation")]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Set initial map location",
        category: "Map",
        description: "Display a basemap centered at an initial location and scale.",
        instructions: "When the map loads, note the specific location and scale of the initial map view.",
        tags: new[] { "LOD", "basemap", "center", "envelope", "extent", "initial", "lat", "latitude", "level of detail", "location", "long", "longitude", "scale", "zoom level" })]
    public class SetInitialMapLocation : UIViewController
    {
        // Hold references to UI controls.
        private MapView _myMapView;

        public SetInitialMapLocation()
        {
            Title = "Set initial map location";
        }

        private void Initialize()
        {
            // Show a map with 'Imagery with Labels' basemap and an initial location.
            _myMapView.Map = new Map(BasemapType.ImageryWithLabels, -33.867886, -63.985, 16);
        }

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();
            Initialize();
        }

        public override void LoadView()
        {
            // Create the views.
            View = new UIView() { BackgroundColor = ApplicationTheme.BackgroundColor };

            _myMapView = new MapView();
            _myMapView.TranslatesAutoresizingMaskIntoConstraints = false;

            // Add the views.
            View.AddSubviews(_myMapView);

            // Lay out the views.
            NSLayoutConstraint.ActivateConstraints(new[]
            {
                _myMapView.TopAnchor.ConstraintEqualTo(View.SafeAreaLayoutGuide.TopAnchor),
                _myMapView.BottomAnchor.ConstraintEqualTo(View.BottomAnchor),
                _myMapView.LeadingAnchor.ConstraintEqualTo(View.LeadingAnchor),
                _myMapView.TrailingAnchor.ConstraintEqualTo(View.TrailingAnchor)
            });
        }
    }
}

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