Abstract
Eel Watershed digital elevation models (DEM). This DVD contains DEMs of the entire Eel River watershed. The Eel River is located mostly in Mendocino County on the coast of California. The source data for these DEMs comes from NED, USGS. Source data was 10x10 meter resolution in ESRI ArcInfo grid format and in geographic (lat/long) projection with NAD83 datum.
It was downloaded from: http://seamless.usgs.gov/ The National Center for Airborne Laser Mapping (NCALM) processed the source grids as follows:
1. merged the tiles into one grid.
2. reprojected from geographic to UTM, zone 10, nad83 projection using bilinear interpolation.
3. Ran a series of analyses on the dataset to produce the following DEMS
eel10mdem: Basic grid of elevation, 10m resolution
eel10mdemacc: Flow accumulation. Grid shows how many other grids flow into each square. Used for watershed delineation and for channel creation.
eel10mdemdir: Azimuth. Shows direction from north a grid cell is facing. Only 8 directions used, moving clockwise.
eel10mdemfil: Sinkfill.To get the flow accumulation, you must fill holes and pockets in the elevation model. This grid is essential a step in the processing.
eel10mdemshd: Hillshade. Models realistic afternoon sun hitting the elevation model. Excellent for visualization.
Any questions should be directed to NCALM. http://calm.geo.berkeley.edu/ncalm
Dino Belugi can answer processing questions. dino@eps.berkeley.edu
Collin Bode can answer general questions about the dataset. collin@berkeley.edu
Collin Bode