<p>Digital elevation model (e11.tif) and gradient (g11.tif) geotiffs
generated from clipped, smoothed bare earth lidar data collected by NCALM as
part of a seed grant to C. Cerovksi-Darriau. The original data can
be found on the Open Topography website (see DOI in the reference link).</p>
<p>For 3D interactive viewing of the DEM at high
resolution, we suggest downloading the free QTReader. </p>
<p>The lidar data required smoothing
of the 1 m x 1 m gridded bare earth data set. Noise in the bare earth data
arises from two sources: (1) errors in point classification and (2) natural
topographic roughness associated with tree throw pit and mounds, animal mounds,
sediment piles, and large woody debris jams. In the Oregon Coast Range the
topographic signature of pit and mound features from tree turnover dominates at
length scales <7.5 m [Roering et al.,2010]. Thus, we smoothed the topography
with a 2-D, second-order polynomial applied to a 10 m x 10 m moving window
[Wood, 1996].</p>
<p>Data projection is NAD1983/UTM Zone 10.</p><p><br></p>
<p>Roering, J.J., Marshall,
J., Booth, A.M., Mort, M. and Jin, Q., 2010. Evidence for biotic controls on
topography and soil production. <i>Earth and Planetary Science Letters</i>, <i>298</i>(1),
pp.183-190.</p>
<p>Wood, J. (1996), The
geomorphological characterisation of digital elevation models, PhD
dissertation, Univ. of Leicester, U. K.</p>
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<p> </p
