Change time extent

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Filter data in layers by applying a time extent to a MapView.

Image of change time extent

Use case

When viewing feature layers that contain a large amount of data with timestamps, you may want to filter the data to only show data relevant to a specific time frame. This can help to visualize changes in the data over time and aids in making better interpretations and predictions of future trends.

How to use the sample

Switch between the available options and observe how the data is filtered.

How it works

  1. Create a MapView with a Map, and add layers that have time-enabled data.
  2. Set the TimeExtent of the map view using TimeExtent property of the .

Relevant API

  • Map
  • MapView
  • TimeExtent

Additional information

Note that time filtering is not applied until the MapView is provided with a TimeExtent. If the TimeExtent is null, no time filtering is applied and all content is rendered.

Tags

data, filter, time, time frame, time span

Sample Code

ChangeTimeExtent.cs
                                                                                                                                     
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// Copyright 2018 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 System;
using Esri.ArcGISRuntime;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using UIKit;

namespace ArcGISRuntime.Samples.ChangeTimeExtent
{
    [Register("ChangeTimeExtent")]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Change time extent",
        category: "MapView",
        description: "Filter data in layers by applying a time extent to a MapView.",
        instructions: "Switch between the available options and observe how the data is filtered.",
        tags: new[] { "data", "filter", "time", "time frame", "time span" })]
    public class ChangeTimeExtent : UIViewController
    {
        // Hold references to UI controls.
        private MapView _myMapView;
        private UISegmentedControl _timeExtentsButton;

        private readonly Uri _mapServerUri = new Uri("https://sampleserver6.arcgisonline.com/arcgis/rest/services/Hurricanes/MapServer");
        private readonly Uri _featureLayerUri = new Uri("https://sampleserver6.arcgisonline.com/arcgis/rest/services/Earthquakes_Since1970/MapServer/0");

        public ChangeTimeExtent()
        {
            Title = "Change time extent";
        }

        private void Initialize()
        {
            // Show a topographic basemap.
            _myMapView.Map = new Map(BasemapStyle.ArcGISTopographic);

            // Load the layers from the corresponding URIs.
            ArcGISMapImageLayer imageryLayer = new ArcGISMapImageLayer(_mapServerUri);
            FeatureLayer pointLayer = new FeatureLayer(_featureLayerUri);

            // Add the layers to the map.
            _myMapView.Map.OperationalLayers.Add(imageryLayer);
            _myMapView.Map.OperationalLayers.Add(pointLayer);
        }

        private void _timeExtentsButton_ValueChanged(object sender, EventArgs e)
        {
            DateTime start;
            DateTime end;

            switch (_timeExtentsButton.SelectedSegment)
            {
                case 0:
                    // Hard-coded values: January 1st, 2000 - December 31st, 2000.
                    start = new DateTime(2000, 1, 1);
                    end = new DateTime(2000, 12, 31);
                    _myMapView.TimeExtent = new TimeExtent(start, end);
                    break;
                case 1:
                    // Hard-coded values: January 1st, 2005 - December 31st, 2005.
                    start = new DateTime(2005, 1, 1);
                    end = new DateTime(2005, 12, 31);
                    _myMapView.TimeExtent = new TimeExtent(start, end);
                    break;
            }
        }

        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;

            _timeExtentsButton = new UISegmentedControl("2000", "2005")
            {
                BackgroundColor = ApplicationTheme.BackgroundColor,
                TintColor = ApplicationTheme.ForegroundColor,
                TranslatesAutoresizingMaskIntoConstraints = false,
                // Clean up borders of segmented control - avoid corner pixels.
                ClipsToBounds = true,
                Layer = {CornerRadius = 5}
            };

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

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

                _timeExtentsButton.LeadingAnchor.ConstraintEqualTo(View.LayoutMarginsGuide.LeadingAnchor),
                _timeExtentsButton.TrailingAnchor.ConstraintEqualTo(View.LayoutMarginsGuide.TrailingAnchor),
                _timeExtentsButton.TopAnchor.ConstraintEqualTo(View.SafeAreaLayoutGuide.TopAnchor, 8)
            });
        }

        public override void ViewWillAppear(bool animated)
        {
            base.ViewWillAppear(animated);

            // Subscribe to events.
            _timeExtentsButton.ValueChanged += _timeExtentsButton_ValueChanged;
        }

        public override void ViewDidDisappear(bool animated)
        {
            base.ViewDidDisappear(animated);

            // Unsubscribe from events, per best practice.
            _timeExtentsButton.ValueChanged -= _timeExtentsButton_ValueChanged;
        }
    }
}

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