The USGS National Stream Quality Accounting Network (NASQAN) program studies the water quality of large rivers of the United States. From 2001 to 2005, NASQAN will study the water quality of the Yukon River. Located in Canada and Alaska, the Yukon River drains approximately 330,000 square miles and is the fourth largest watershed in North America. As part of this water quality study, a number of Geographical Information System (GIS) data sets are being created.
The purpose of the GIS datasets of the Yukon River Basin is to provide scientists working on the Yukon River study the information needed to do basic spatial analysis.This GIS coverage is one of 16 coverages created for the Yukon study.
The soil carbon coverage of the Yukon River Basin was created by obtaining a Statewide coverage of soil carbon developed by the Natural Resource Conservations Service (NRCS) and a soil landscape coverage of Canada developed by the Canadian Agricultural Department. Using the watershed boundary of the Yukon River Basin as the clip coverage, the Alaska and Canadian portions of the Yukon River Basin were cut from the two coverages and then mapjoined. The coverage was projected into an Albers Equal Area projection with the following parameters:
Projection ALBERS Units METERS 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
YUK_CARB.PAT:
COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME
1 AREA 8 18 F 5
9 PERIMETER 8 18 F 5
17 YUK_CARB# 4 5 B -
21 YUK_CARB-ID 4 5 B -
25 CARBON 6 6 N 2
31 SCARBON 6 6 N 2
37 MCARBON 6 6 N 2
CARBON is the carbon value (kg/sq meter, total depth)
SCARBON is the carbon value (kg/sq meter, 30 cm depth)
MCARBON is the carbon value (kg/sq meter, 100 cm depth)
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.