Spatially Uniform DEM ErrorFurther Reading on Spatially Uniform Error Specification
Spatially Variable DEM Error (Using Fuzzy Inference Systems)Background on Fuzzy Inference SystemsThis video tutorial goes through a portion of the background covered in the Geomorphic Change Detection workshop on fuzzy inferences systems as they are applied to geomorphic change detection.Specifying Fuzzy Inference Systems in GCD 4.0This tutorial covers how you load a customized or previously saved (nondefault) fuzzy inference system in the GCD software.One of the inputs that we commonly use in our fuzzy inference systems is a point density raster. Deriving this point density raster as a clipped concurrent grid is a little tricky in ArcGIS. It requires not only consistently setting the Point Density tool parameters correctly (we typically use a 5m x 5m square moving window and units of points per square meter), but also controlling the environment settings to enforce grid concurrency with your DEM as well as an additional clipping step.This model and toolbox simplifies that process into one step (made for ArcGIS 10; see here for how to add a toolbox): Customizing Fuzzy Inference Systems using Matlab Fuzzy Logic ToolboxThese video tutorials goes through how you customize a Fuzzy Inference System in Matlab for use in the GCD. Warning, these videos are only useful if you have Matlab on your computer installed with the Fuzzy Logic Toolbox. If you want to make your own fuzzy inference systems or edit systems you can still do so (scroll down to 'Customizing Fuzzy Inference Systems with a Text Editor').Part I  Getting Around in the Fuzzy Logic TooloboxPart II Looking at the Default Fuzzy Inference System for GCD 4.0This goes through how the default two input fuzzy inference system for GCD 4.0 is set up, which is described in both Wheaton (2008) and Wheaton et al. (2010). The video shows you how to explore how the fuzzy inference system works and how it is organized.Part III  Modifying a Fuzzy Inference SystemThis video goes through modifying inputs and rules in Matlab's Fuzzy Logic Toolbox.Customizing Fuzzy Inference Systems with a Text EditorThis video goes through how you customize a Fuzzy Inference System using either GCD or a text editor for use in GCD. Modifying or Adding to the Default Fuzzy Inference System(s) in GCD 4.0Further Reading on Fuzzy Inference Systems
Spatially Variable DEM Error (User Defined)This option is not yet supported in GCD 4.0. This video explains what it entails.Further Reading on Spatially Variable Error Specification

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