The USGS National Water-Quality Assessment (NAWQA) Program's Cook
Inlet Basin study unit is an intergrated water-quality assessment
designed to address a broad array of water-quality properties at
various spatial and temporal scales. These properties are then
related to natural and human factors that can influence the
quality of water. The Ninilchik River, located on the Kenai
Peninsula in the southeast part of the Cook Inlet Basin, is
one of 15 sites selected for study.
The purpose of this data set is to give the Cook Inlet NAWQA study unit the information needed to do basic spatial analysis for a given watershed within the Cook Inlet Basin. A digital elevation model (DEM) of a basin can be used to determine the slope, aspect, and mean elevation of a watershed. DEMs can also be used as input to runoff and water-quality models.
Procedures_Used The DEMs of the 1:63,360 USGS quadrangles which comprise the Ninilchik River Basin were obtained in digital form from the USGS National Mapping Division. Each quadrangle was projected into an Albers Equal Area projection with the following parameters:
Projection ALBERS Units Meters Spheroid CLARKE1866 Datum NAD27 Parameters: 1st standard parallel 55 00 00 2nd standard parallel 65 00 00 central meridian -154 00 00 latitude of projection's origin 50 00 00 false easting (meters) 0.0000 false northing (meters) 0.0000
The quadrangles were then joined to form a single coverage. Using the basin boundary of the Ninilchik River and ARC/INFO GRID algebra commands, the DEM of the Ninilchik River Basin was created.
NINIL_DEM.VAT: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 VALUE 4 10 B - 5 COUNT 4 10 B - NINIL_DEM.STA: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 MIN 8 15 F 3 9 MAX 8 15 F 3 17 MEAN 8 15 F 3 25 STDV 8 15 F 3
Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data.
The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials.