Digital elevation models (DEMs) are available as raster files at 100m, 30m, and 10m resolutions for the contiguous United States and are used in a variety of geographic analyses. Some projects may require a finer resolution. GIS software offers many options for interpolating data to higher resolutions. We compared ten interpolation methods using 10m sample data from the Ouachita Mountains in central Arkansas. We interpolated the 10m DEM to 5m, 2.5m, and 1m resolutions and compared the absolute mean difference (AMD) for each using surveyed control points. Overall, there was little difference in the accuracy between interpolation methods at the resolutions tested and minimal departure from the original 10m raster.
Guarneri, J. C. and Weih, R. C. Jr.
"Comparing Methods for Interpolation to Improve Raster Digital Elevation Models,"
Journal of the Arkansas Academy of Science: Vol. 66
, Article 16.
Available at: http://scholarworks.uark.edu/jaas/vol66/iss1/16