Dear Dave, thank you very much for your feedback. It works like a charm in the ArcGIS Runtime App! However, I still have a problem when I want to combine more arguments in my rtf file. I would like to ask you one more question: How I can pass result from one function as the input of another function in the same rtf file? Suppose that I want to filter my DEM by elevation and slope, just like you did in your sample app. I use local and slope function to achieve this. How I can pass result of my slope function to another local function? Attached is the screenshot of my rtf file. I found in the documentation that it is possible. But there is no example how to achieve this. "A raster value can be the image service ("$$") -- default, an image in the image service ("$oid"), or a result from another function (a rendering rule object)." Thank you in advance, Best regards, Adam
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