[Data_Center: Short_Name='DOI/USGS/WRD/GIS']
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GIS Coverage for the National Water-Quality Assessment (NAWQA) Program Retrospective Database for Nutrients in Surface Water: Monitoring Locations
Entry ID:
NAWQAHIS
Summary
Abstract:
The retrospective database is a compilation of historical water-quality and
ancillary data collected before NAWQA Study Units initiated sampling in 1993. This coverage contains the point locations of monitoring locations where historical water-quality data was collected. Water-quality data were obtained by study-unit personnel from the U.S. Geological Survey (USGS) National Water Information ... 
Related URL
Data Set Citation
Dataset Originator/Creator:
Hitt, K.J. and Nakagaki
Dataset Title:
National Water-Quality Assessment (NAWQA) Program Retrospective Database for Nutrients in Surface Water : Monitoring Locations
Dataset Release Date:
1999-07-01
Dataset Release Place:
Reston, VA
Dataset Publisher:
USGS
Data Presentation Form:
Map
Location Keywords
Science Keywords
ISO Topic Category
Project
Quality
Mueller and others (1995) used this data to determine preexisting
water-quality conditions in the first 20 NAWQA Study Units that began in 1991. Also, Nolan and Ruddy (1996) used the data to describe areas of the United States at risk of nitrate contamination of ground water. ...
Access Constraints
None
Use Constraints
Historical data can be of limited use in national assessments
because of inconsistencies between and within agencies in database structure and format and in sample collection, preservation, and analytical procedures. For example, changes in sample collection and analytical procedures can cause shifts in constituent concentrations that are unrelated to possible changes in environmental factors. See Mueller and others (1995) for assumptions and limitations associated with the retrospective database. Data Set Progress
COMPLETE
Originating Center
Data Center
Distribution
Distribution Media:
FTP
Distribution Size:
6184720
Distribution Format:
ArcInfo export format
Fees:
No fees
Distribution Media:
FTP
Distribution Size:
16303646
Distribution Format:
ArcView shapefile
Fees:
No fees
Personnel
Role:
DIF AUTHOR
Phone:
(301) 614-6898
Fax:
301-614-5268
Email:
Tyler.B.Stevens at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory
City:
Greenbelt
Province or State:
MD
Postal Code:
20771
Country:
USA
Publications/References
Anderson, J.R., Hardy, E.E., Roach, J.T., and Witmer, R.E., 1976, A
land use and land cover classification system for use with remote sensor data: U.S. Geological Survey Professional Paper 964, 28 p. Fegeas, R.G., Claire, R.W., Guptill, S.C., Anderson, K.E., and Hallam, C.A., 1983, Land use and land cover digital data: U.S. Geological Survey Circular 895-E, 21 p. ... Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date:
2002-11-15
Last DIF Revision Date:
2013-04-22
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