Spatially Uniform DEM Error
Further Reading on Spatially Uniform Error Specification
- See pages 78-90 of:
- See page 140 of:
Spatially Variable DEM Error (Using Fuzzy Inference Systems)
Background on Fuzzy Inference Systems
This 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 4.0
This tutorial covers how you load a customized or previously saved (non-default) fuzzy inference system in the GCD software.
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 Toolbox
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 Toolobox
Part II -Looking at the Default Fuzzy Inference System for GCD 4.0
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 System
This video goes through modifying inputs and rules in Matlab's Fuzzy Logic Toolbox
Customizing Fuzzy Inference Systems with a Text Editor
This 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 4.0
Further 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
- See pages 162-165 of:
- Milan DJ, Heritage GL,
Large ARG and Fuller IC. 2010. Filtering spatial error from DEMs:
Implications for morphological change estimation. Geomorphology. 125(1):
160-171. DOI: 10.1016/j.geomorph.2010.09.012.
- See separate treatment of wet and dry areas in:
SN, Westaway RM and Hicks DM. 2003. Estimation of erosion and
deposition volumes in a large, gravel-bed, braided river using synoptic
remote sensing. Earth Surface Processes and Landforms. 28(3): 249-271.