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# National Water Information System
# 2024/04/19
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# Date Retrieved: USGS Water Data for the Nation Help System
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gw_ref_cd	gw_ref_ds
1s	71s
C	Calculated from land net
D	Differentially corrected Global Positioning System.
W	GNSS1 - Level 1 Quality Survey Grade Global Navigation Satellite System
X	GNSS2 - Level 2 Quality Survey Grade Global Navigation Satellite System
Y	GNSS3 - Level 3 Quality Survey Grade Global Navigation Satellite System
Z	GNSS4 - Level 4 Quality Survey Grade Global Navigation Satellite System
N	Interpolated from Digital MAP.
M	Interpolated from MAP.
L	Long range navigation system.
G	Mapping grade GPS unit (handheld accuracy range 12 to 40 ft)
R	Reported.
F	Survey-grade GPSF
S	Transit, theodolite, or other surveying method.
U	Unknown.