topic Re: LayerFactory.CreateMosiacLayer returns null for Landsat URL in ArcGIS Pro SDK Questions

LayerFactory.CreateMosiacLayer returns null for Landsat URL

KirkKuykendall1 — Wed, 17 Nov 2021 03:12:03 GMT

When I run this code with 2.9, it prints: "null layer" then "ImageServiceLayer".

I was expecting to get a MosaicLayer. Am I doing something wrong?

var uri = new Uri(@"https://landsat2.arcgis.com/arcgis/rest/services/Landsat/MS/ImageServer"); var map = MapView.Active.Map; await QueuedTask.Run(() => { var layer = LayerFactory.Instance.CreateMosaicLayer(uri, map,0,"landsat"); if (layer == null) Debug.Print("null layer"); var layer2 = MapView.Active.Map.Layers[0]; Debug.Print(layer2.GetType().Name); });

Re: LayerFactory.CreateMosiacLayer returns null for Landsat URL

GKmieliauskas — Thu, 18 Nov 2021 06:53:52 GMT

Hi,

I have used ArcGIS Pro sample https://github.com/Esri/arcgis-pro-sdk-community-samples/tree/master/Map-Authoring/AddRasterLayer code to load ImageServiceLayer.

// Create a url pointing to the source. In this case it is a url to an image service // which will result in an image service layer being created. string dataSoureUrl = @"http://imagery.arcgisonline.com/arcgis/services/LandsatGLS/GLS2010_Enhanced/ImageServer"; // Note: A url can also point to // 1.) An image on disk or an in a file geodatabase. e.g. string dataSoureUrl = @"C:\temp\a.tif"; This results in a raster layer. // 2.) A mosaic dataset in a file gdb e.g. string dataSoureUrl = @"c:\temp\mygdb.gdb\MyMosaicDataset"; This results in a mosaic layer. // 3.) A raster or mosaic dataset in an enterprise geodatabase. // Create an ImageServiceLayer object to hold the new layer. ImageServiceLayer rasterLayer = null; // The layer has to be created on the Main CIM Thread (MCT). await QueuedTask.Run(() => { // Create a layer based on the url. In this case the layer we are creating is an image service layer. rasterLayer = (ImageServiceLayer)LayerFactory.Instance.CreateLayer(new Uri(dataSoureUrl), myMap); // Check if it is created. if (rasterLayer == null) { ArcGIS.Desktop.Framework.Dialogs.MessageBox.Show("Failed to create layer for url:" + dataSoureUrl); return; } // Validate the colorizer to see if the layer is colorized correctly. if (!(rasterLayer.GetColorizer() is CIMRasterRGBColorizer)) ArcGIS.Desktop.Framework.Dialogs.MessageBox.Show("Colorizer does not match for layer created from url: " + dataSoureUrl); });

After you can try to check rasterLayer is MosaicLayer and if it is trus cast rasterLayer to MosaicLayer

Re: LayerFactory.CreateMosiacLayer returns null for Landsat URL

KirkKuykendall1 — Thu, 18 Nov 2021 17:07:10 GMT

@GKmieliauskas thanks for responding!

Unfortunately, when I run your code with the Landsat Url, I get a ImageServiceLayer, and not a MosaicLayer.

The properties for the resulting layer say there are 3 bands...

And yet the metadata says it has 9 bands ....

Other properties in the metadata suggest I should be able to create a mosaiclayer from it, e.g. MaxMosaicImageCount, AllowedMosaicMethods, AvailableMosaicMethods, etc.

Is there a sample anywhere showing how to create a MosaicLayer from a Landsat Imagery URL?

Re: LayerFactory.CreateMosiacLayer returns null for Landsat URL

GKmieliauskas — Fri, 19 Nov 2021 07:08:09 GMT

Hi,

You can MosaicRule on ImageServiceLayer:

// Get the mosaic rule of the image service. CIMMosaicRule mosaicRule = imageServiceLayer.GetMosaicRule(); // Set the mosaic method to be Center. mosaicRule.MosaicMethod = RasterMosaicMethod.Center; // Update the image service with the changed mosaic rule. imageService.SetMosaicRule(mosaicRule);

I have tried and it works.

Another one thing I have found in https://github.com/Esri/arcgis-pro-sdk/wiki/ProConcepts-Map-Authoring#working-with-mosaic-layers

Similarly, an image service layer that is part of a mosaic layer can be distinguished from other image service layers by using the ImageMosaicSubLayer class. You could try to investigate ImageMosaicSubLayer functionality