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Raster-based analysis on two or more DEMs can provide information about change patterns and trends. A common approach to mapping elevation change between two surveys is DEM differencing, performed by map algebra within GIS (r.mapcalc in GRASS). For a larger number of elevation data snapshots, per cell statistics can be applied to the raster DEMs to derive summary maps, which reveal the spatial patterns of stable and dynamic sites, the time periods when sites reach their highest or lowest elevations, and the trends in elevation change.
KeywordsSand Dune Elevation Change Core Surface Envelope Surface Raster Cell
- Mitasova, H., Hardin, E., Overton, M., and Harmon, R. (2009). New spatial measures of terrain dynamics derived from time series of lidar data. Proc. 17th Int. Conf. on Geoinformatics, Fairfax, VA. DOI: 10.1109/GEOINFORMATICS.2009.5293539. Associated animation: http://skagit.meas.ncsu.edu/~helena/gmslab/papers/Core_Envelope_anim.ppt.