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Datums Page Page 1 of 8
Station ID: 8518951 PUBLICATION DATE: 12/05/2014
Name: HYDE PARK, HUDSON RIVER
NY
NOAA Chart: 12347 Latitude: 41° 47.0' N ( 41.78330)
USGS Quad: HYDE PARK Longitude: 73° 57.0' W ( -73.95000)
To reach the station from the hyde park us post office at 1 east market street,
proceed west and then southwest 0.5 km (0.3 mi) on market street to the
intersection with dock river road, continue straight onto dock river road and
proceed 0.35 km (0.2 mi) west to the sharp bend to the left where dock river
road becomes river road, continue southwest 0.2 km (0.1 mi) on river road to the
gated entrance to hyde park landing and the tide station on the right. The
bench marks are in the vicinity of the tide station.
T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 8518951 PUBLICATION DATE: 12/05/2014
Name: HYDE PARK, HUDSON RIVER
NY
NOAA Chart: 12347 Latitude: 41° 47.0' N ( 41.78330)
USGS Quad: HYDE PARK Longitude: 73° 57.0' W ( -73.95000)
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 1 M 1934
DESIGNATION: TIDAL 1 M STA I 12
MONUMENTATION: Tidal Station disk VM#: 21029
AGENCY: US Coast and Geodetic Survey IDB PID#: LX1428
SETTING CLASSIFICATION: Set in rock outcrop OPUS PID#: LX1428
LATITUDE: 41° 47.3' N ( 41.78833) LONGITUDE: 73° 56.8' W ( -73.94703)
The primary bench mark is a disk set in exposed bedrock on the bank of the
river, 41.75 m (137.0 ft) S of bench mark hyde park 2 reset, 18.30 m (60.0 ft)
SSW of a 0.4 m (1.3 ft) diameter sycamore tree, 15.60 m (51.2 ft) W of the
center of a gate in the fence along the W side of the railroad tracks and 15.20
m (49.9 ft) W of the fence.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 8518951 PUBLICATION DATE: 12/05/2014
Name: HYDE PARK, HUDSON RIVER
NY
NOAA Chart: 12347 Latitude: 41° 47.0' N ( 41.78330)
USGS Quad: HYDE PARK Longitude: 73° 57.0' W ( -73.95000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: HYDE PARK 1933
DESIGNATION: HYDE PARK 2 RESET
MONUMENTATION: Triangulation Station disk VM#: 21030
AGENCY: US Coast and Geodetic Survey IDB PID#: LX1431
SETTING CLASSIFICATION: Set in a boulder OPUS PID:
LATITUDE: 41° 47.3' N ( 41.78872) LONGITUDE: 73° 56.8' W ( -73.94706)
The bench mark is a disk set in a large rock on the bank of the river, 44.50 m
(146.0 ft) SW of a metal fencepost at the N end of the fence along the W side of
the railroad tracks, 41.75 m (137.0 ft) N of bench mark tidal 1 M station I 12,
24.20 m (79.4 ft) NNW of a 0.4 m (1.3 ft) diameter sycamore tree, 19.40 m (63.6
ft) W of the fence, 10.40 m (34.1 ft) SW of reference mark hyde park 2 RM 1 and
1.30 m (4.3 ft) E of the river and the W side of the rock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 8518951 PUBLICATION DATE: 12/05/2014
Name: HYDE PARK, HUDSON RIVER
NY
NOAA Chart: 12347 Latitude: 41° 47.0' N ( 41.78330)
USGS Quad: HYDE PARK Longitude: 73° 57.0' W ( -73.95000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: HYDE PARK 2 1 1905 1933
DESIGNATION: HYDE PARK 2 RM 1
MONUMENTATION: Reference Mark disk VM#: 21031
AGENCY: US Coast and Geodetic Survey IDB PID#: LX1432
SETTING CLASSIFICATION: Unspecified rock or boulder OPUS PID:
LATITUDE: 41° 47.3' N ( 41.78881) LONGITUDE: 73° 56.8' W ( -73.94694)
The bench mark is a disk set in exposed rock, 34.50 m (113.2 ft) SSW of a metal
fence post at the N end of the fence along the W side of the railroad tracks,
31.35 m (102.9 ft) N of a 0.4 m (1.3 ft) diameter sycamore tree, 12.60 m (41.3
ft) W of the fence, 3.50 m (11.5 ft) E of the W end of the exposed rock and the
river bank.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 8518951 PUBLICATION DATE: 12/05/2014
Name: HYDE PARK, HUDSON RIVER
NY
NOAA Chart: 12347 Latitude: 41° 47.0' N ( 41.78330)
USGS Quad: HYDE PARK Longitude: 73° 57.0' W ( -73.95000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3 1933
DESIGNATION: TIDAL 3 STA I 12
MONUMENTATION: Tidal Station disk VM#: 21032
AGENCY: US Coast and Geodetic Survey IDB PID#: LX1427
SETTING CLASSIFICATION: Bridge Abutment OPUS PID:
LATITUDE: 41° 47.3' N ( 41.78781) LONGITUDE: 73° 56.8' W ( -73.94686)
The bench mark is a disk set in the N bridge abutment, 30.60 m (100.4 ft) N of a
gate in the fence along the W side of the railroad tracks, 7.67 m (25.2 ft) S of
the most N concrete support for the metal railing, 3.65 m (12.0 ft) W of the
fence, 0.38 m (1.2 ft) E of the W side of the abutment and 0.21 m (0.7 ft) S of
edge of N end of the abutment.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 8518951 PUBLICATION DATE: 12/05/2014
Name: HYDE PARK, HUDSON RIVER
NY
NOAA Chart: 12347 Latitude: 41° 47.0' N ( 41.78330)
USGS Quad: HYDE PARK Longitude: 73° 57.0' W ( -73.95000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: MM 5 1931
DESIGNATION: MM 5
MONUMENTATION: Bench Mark disk VM#: 21033
AGENCY: US Geological Survey IDB PID#: LX1425
SETTING CLASSIFICATION: Abutment OPUS PID:
LATITUDE: 41° 47.3' N ( 41.78756) LONGITUDE: 73° 56.8' W ( -73.94656)
The bench mark is a disk set in the NE corner of the retaining wall E of the
railroad tracks and S of the bridge, 22.20 m (72.8 ft) NW of a 0.38 m (1.2 ft)
diameter HDP culvert, 11.90 m (39.0 ft) ENE of a gate in the fence along the E
side of the railroad tracks, 10.10 m (33.1 ft) SE of a lamp post and 7.50 m
(24.6 ft) ESE of the centerline of the asphalt drive.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 8518951 PUBLICATION DATE: 12/05/2014
Name: HYDE PARK, HUDSON RIVER
NY
NOAA Chart: 12347 Latitude: 41° 47.0' N ( 41.78330)
USGS Quad: HYDE PARK Longitude: 73° 57.0' W ( -73.95000)
T I D A L D A T U M S
Tidal datums at HYDE PARK, HUDSON RIVER based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: May 2014 - July 2014
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8518750 THE BATTERY, NEW YORK HARBOR
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.250
MEAN HIGH WATER MHW = 1.132
MEAN SEA LEVEL MSL = 0.614
MEAN TIDE LEVEL MTL = 0.597
North American Vertical Datum NAVD88 = 0.543
MEAN LOW WATER MLW = 0.061
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
1 M 1934 1.691 0.559
HYDE PARK 1933 2.725 1.593
HYDE PARK 2 1 1905 1933 2.921 1.789
3 1933 3.400 2.268
MM 5 1931 3.428 2.296
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 8518951 PUBLICATION DATE: 12/05/2014
Name: HYDE PARK, HUDSON RIVER
NY
NOAA Chart: 12347 Latitude: 41° 47.0' N ( 41.78330)
USGS Quad: HYDE PARK Longitude: 73° 57.0' W ( -73.95000)
D E F I N I T I O N S
Mean Sea Level (MSL) is a tidal datum determined over a 19-year National Tidal
Datum Epoch. It pertains to local mean sea level and should not be confused
with the fixed datums of North American Vertical Datum of 1988 (NAVD88).
NAVD88 is a fixed datum derived from a simultaneous, least squares, minimum
constraint adjustment of Canadian/Mexican/United States leveling observations.
Local mean sea level observed at Father Point/Rimouski, Canada was held fixed as
the single initial constraint. NAVD88 replaces NGVD29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD29 was originally derived from a general
adjustment of the first-order leveling networks of the U.S. and Canada after
holding mean sea level observed at 26 long term tide stations as fixed.
Numerous local and wide-spread adjustments have been made since establishment in
1929. Bench mark elevations relative to NGVD29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD88 and NGVD29 are fixed geodetic datums whose elevation relationships to
local MSL and other tidal datums may not be consistent from one location to
another.
The Vertical Mark Number (VM#) and PID# shown on the bench mark sheet are unique
identifiers for bench marks in the tidal and geodetic databases, respectively.
Each bench mark in either database has a single, unique VM# and/or PID# assigned.
Where both VM# and PID# are indicated, both tidal and geodetic elevations are
available for the bench mark listed. The NGS's Integrated Data Base (IDB PID)
provides geodetic datum based on traditionally leveled and bluebooked ties to
the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/.
The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based
on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/.
The NAVD88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD88 elevations.
The NAVD88 elevation relationship shown in the table is derived from an average
of several bench mark elevations relative to tide station datum. As a result of
this averaging, NAVD88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD88 elevations listed for
each bench mark in the NGS database.