Geomorphic Change Detection Software

DoD Thresholding

Overview

This exercise contrasts the three most common forms of thresholding DoDs: i) Simple minimum level of detection, ii) propagated errors, and iii) probabilistic. We use the GCD Add-In to facilitate the analysis.

Data and Materials for Exercises

Datasets

I_Thresholding.zip File of Data for this Exercise. Data from:

Prerequisite for this Exercise

  • Some ArcGIS experience
  • ArcGIS 10.X w/ Spatial Analyst Extension
  • GCD Add-In

GCD6_Form_ChangeDetectionConfiguration

Overview of Thresholding

GCD Provides three primary ways for you to threshold data (all using exclusion):

Simple Minimum Level of Detection

In this video tutorial we explain how to use the GCD Change Detection panel to to a basic DoD Analysis with simple minimum level of detection thresholding. This is the equivalent of the raster calculator operation in the 03. Simple DoD in Raster Calculator tutorial.

Propagated Errors

In this video tutorial we explain how to use the GCD Change Detection panel to to a DoD Analysis with propagated errors (from error rasters in the Survey Library) to establish the level of detection threshold.

Probability

In this video tutorial we explain how to use the GCD Change Detection panel to to a DoD Analysis with probabilistic thresholding based on a confidence interval.

This tutorial corresponds with topic G. Thresholding Alternatives in the GCD Workshop. See the lecture materials there for more background on the underlying theories for these methods.

Extra:

How to Make your own Elevation Change Distribtuions

Step by Step

Part 1 - Simple minLoD

ExcerciseI1 How to do in GCD 7:

How to do in GCD 6:

Part 2 - Propagated Error

ExcerciseI2

How to do in GCD 7:

How to do in GCD 6:

Part 3 - Probabilistic

ExcerciseI3 How to do in GCD 7:

How to do in GCD 6:


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