The GCD software was developed
primarily for morphological sediment budgeting
in rivers. The volumetric change
in storage is calculated from the difference in surface elevations from
elevation models (DEMs) derived from repeat topographic surveys. As each
has an uncertain surface representation (which might vary in space and
time), our ability to detect changes between surveys is highly dependent
on surface representation uncertainties inherent in the individual
DEMs. The fundamental problem is separating out the changes between the
surveys that are due to geomorphic change as opposed to noise in the
survey data. GCD provides a suite of tools for quantifying those
uncertainties independently in each DEM and propagating
them through to the DEM of difference. The program also provides ways
segregating the best estimates of change spatially using different types
The overall suite of tools is more generically applicable to many
spatial change detection problems.
The methodological development is described in (Wheaton et al., 2010a), the Wheaton (2008)
thesis, and the Wheaton et al. (2010b)
RRA paper. The Matlab version of the code (DoD 3) is provided as supplemental information with the ESPL
paper so that readers can test or extend the code as they see fit for their
FundingCurrent funding for the Geomorphic Change Detection Software development(GCD 5) is being provided by the National Science Foundation () and Idaho Power Company. Previous funding for GCD Software Development was provided and the USGS's Grand Canyon Monitoring & Research Center
and by the Utah State University ICRRR (Intermountain Center for River Rehabilitation and Restoration).
See Extending GCD Software for latest developments (GCD 5).
Note:DoD is an acronym for DEM (digital
elevation model) of Difference (not Department of Defense). DoDs are
derived from repeat topographic surveys and used in change detection
studies and morphological sediment budgeting.