Apply mosaic rule to rasters

Apply mosaic rule to a mosaic dataset of rasters.

Use case

An image service can use a mosaic rule to mosaic multiple rasters on-the-fly. A mosaic rule can specify which rasters are selected, and how the selected rasters are z-ordered. It can also specify how overlapping pixels from different rasters at the same location are resolved.

For example, when using the "ByAttribute" mosaic method, the values in an attribute field are used to sort the images, and when using the "Center" method, the image closest to the center of the display is positioned as the top image in the mosaic. Additionally, the mosaic operator allows you to define how to resolve the overlapping cells, such as choosing a blending operation.

Specifying mosaic rules is useful for viewing overlapping rasters. For example, using the "ByAttribute" mosaic method to sort the rasters based on their acquisition date allows the newest image to be on top. Using "Mean" mosaic operation makes the overlapping areas contain the mean cell values from all the overlapping rasters.

How to use the sample

When the rasters are loaded, choose from a list of preset mosaic rules to apply to the rasters.

How it works

1. Create an ImageServiceRaster using the service's URL.
2. Create a MosaicRule object and set it to the MosaicRule property of the image service raster, if it does not specify a mosaic rule.
3. Create a RasterLayer from the image service raster and add it to the map.
4. Set the MosaicMethod, MosaicOperation, and other properties of the mosaic rule object accordingly to specify the rule on the raster dataset.

Relevant API

• ImageServiceRaster
• MosaicMethod
• MosaicOperation
• MosaicRule

About the data

This sample uses a raster image service hosted on ArcGIS Online that shows aerial images of Amberg, Germany.

Additional information

For more information, see Understanding the mosaicking rules from ArcGIS Desktop documentation. To learn more about how to define certain mosaic rules, see Mosaic rule objects from ArcGIS for Developers.

Tags

image service, mosaic method, mosaic rule, raster

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<UserControl x:Class="ArcGISRuntime.WinUI.Samples.ApplyMosaicRule.ApplyMosaicRule"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:esriUI="using:Esri.ArcGISRuntime.UI.Controls">
    <Grid>
        <esriUI:MapView x:Name="MyMapView" />
        <Border HorizontalAlignment="Right"
                VerticalAlignment="Top"
                Style="{StaticResource BorderStyle}">
            <StackPanel Orientation="Horizontal">
                <TextBlock VerticalAlignment="Center" Text="Mosaic rule:" />
                <ComboBox x:Name="MosaicRulesBox"
                          Margin="5"
                          Background="White"
                          SelectionChanged="MosaicRulesBox_SelectionChanged" />
            </StackPanel>
        </Border>
    </Grid>
</UserControl>