Topographic Change Detection
Gregory B. Pasternack, Jennifer Carley, Joshua R. Wyrick, Rocko Brown, Matthew Weber
Topographic change is the rise or fall of the elevation of the Earth's surface through time. Conceptually, tracking topographic change ought to be as simple as mapping the landscape at two times and then looking to see how it changed. Unfortunately, it is not that simple, because there are many sources of error, such as measurement technology errors and the errors associated with the fact that the points in the two maps are not at exactly the same locations in both surveys. This project has developed new approaches for detecting topographic change from uncertain datasets and then using the results to understand the natural phenomenon of topographic change.
Sample DEM difference map
- Carley, J. K., Pasternack, G. B., Wyrick, J. R., Barker, J. R., Bratovich, P. M., Massa, D. A., Reedy, G. D., Johnson, T. R. 2012. Significant decadal channel change 58-67 years post-dam accounting for uncertainty in topographic change detection between contour maps and point cloud models. Geomorphology 179: 71-88, doi:10.1016/j.geomorph.2012.08.001.
- Brown, R. A. and Pasternack, G. B. 2014. Assessment of the 2012 gravel/cobble augmentation in the Englebright Dam reach of the lower Yuba River, CA in response to atmospheric river floods. Prepared for the U.S. Army Corps of Engineers, Sacramento District. University of California at Davis, Davis, CA, 37pp.
- Pasternack, G. B., Wyrick, J. R. 2016. Flood-driven topographic changes in a gravel-cobble river over segment, reach, and unit scales. Earth Surface Processes and Landforms. doi: 10.1002/esp.4064.