topic How to assign a classified renderer to a GdbRasterCatalog layer in ArcObjects SDK Questions

How to assign a classified renderer to a GdbRasterCatalog layer

ThomasCox — Thu, 19 May 2011 13:26:48 GMT

I am trying to assign a classified renderer to a GdbRasterCatalog layer with no luck. I have examined the samples that are provided, but have not been able to make it behave.

I have developed code that allows a user to specify a date range, retrieve GRIDS falling within the range, build, and populate a GdbRasterCatalog, and add it to the ArcMap session. I was hoping the classification renderer assignment would be as straight forward as it is with a standard stand alone raster.

For the portion of the application that retrieves the stand alone GRIDS, it is pretty straight forward to assign an existing renderer derived from a .lyr file that contains the proper renderer classification definition. The GdbRasterCatalog apparently does not offer the option of assigning a renderer in that fashion.

Through the ArcMap interface, I am able to go through the process of adding the classified renderer type and removing the other non needed rendering types and building the appropriate classified renderer. I need to be able to do this programmatically through C#. I understand that the classification renderer is not one of the ???default??? renderers associated with the GDBRasterCatalog layer.

I have examined the IRasterCatalogRendererPicker bit, with no luck.

If need be, I can go through the effort of building the classified renderer directly from the catalog and abandon trying to use the renderer derived from the .lyr file. However, I still need to know how to assign the renderer to the GdbCatalog layer.

Any assistance would be greatly appreciated

Re: How to assign a classified renderer to a GdbRasterCatalog layer

NeilClemmons — Thu, 19 May 2011 13:54:00 GMT

Can you not use IGeoFeatureLayer.Renderer to assign the renderer from the layer file to the layer?

Re: How to assign a classified renderer to a GdbRasterCatalog layer

ThomasCox — Thu, 19 May 2011 19:18:38 GMT

Thanks for the response.

I have not tried your suggestion. However, as soon as I finished the post, it occurred to me to build a new array, load it with the desired renderer from the layer file and then assign the renderers property fo the GdbRasterCatalog layer to the array.

                IArray pArray = new ESRI.ArcGIS.esriSystem.Array();
                pArray.Add(pRasterClassify);
                pGdbRasterCatalogLayer.Renderers = pArray;

I appreciate your response. As I refine the the application I may migrate to the approach you suggested.