Hi - I was wondering if someone has developed a widget similar to what I'm looking for, or could give me any advice (I have no experience writing code!). I need to replicate the functionality of a weighted overlay procedure within a Web App environment - the widget would be an interface that allows the user to adjust the weights of a set of rasters comprising the overlay, using a set of sliders from 1-0, where a query returns the weighted sum of adjusted pixel values (the sum of all weights must = 1, so weights of remaining datasets would need to be automatically proportionally adjusted). Has anyone done anything like this? Any assistance would be great!
Probably the easiest way to do this, would be to create a geoprocessing service and use the Geoprocessing Widget in the WAB... All parameters that you define for the geoprocessing service will appear in the interface: