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Simple. Use the PointOnAreaOverlayer transformer. In the parameters dialog set a list name. The polygon features will emerge with a list of which point features fell inside, including their attributes. Then use a ListSummer transformer to add up the attribute X in that list. I put an example workspace (template) on Dropbox at: ...


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To put things clear, I assume that you want to compute the area which responds to the following conditions: located inside your DEM altitude interval located inside your vector boundaries located where your second raster (let's call it raster2) has values other than "nodata" (this is the unclear part of your post, feel free to correct me if I ...



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