U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8518902 PUBLICATION DATE: 12/04/2014
Name: NYC, DYCKMAN ST., FERRY SLIP
NY
NOAA Chart: 12345 Latitude: 40° 52.1' N ( 40.86830)
USGS Quad: CENTRAL PARK Longitude: 73° 56.0' W ( -73.93330)
To reach the station from the intersection of Broadway and Dyckman street in New
York, proceed 0.6 km (0.4 mi) NW on Dyckman street to the end of Dyckman street
and the river front walkway on the S side of the street, turn left and proceed
on foot 0.2 km (0.1 mi) south to the Inwood Canoe Club and the tide station on
the right. Bench marks are in the vicinity of the tide station and along
Dyckman Street.
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 6
Station ID: 8518902 PUBLICATION DATE: 12/04/2014
Name: NYC, DYCKMAN ST., FERRY SLIP
NY
NOAA Chart: 12345 Latitude: 40° 52.1' N ( 40.86830)
USGS Quad: CENTRAL PARK Longitude: 73° 56.0' W ( -73.93330)
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 3 1939
DESIGNATION: TIDAL 3 STA I 27
MONUMENTATION: Tidal Station disk VM#: 21111
AGENCY: US Coast and Geodetic Survey IDB PID#: KU0907
SETTING CLASSIFICATION: Concrete abutment wing wall OPUS PID:
LATITUDE: 40° 52.1' N ( 40.86908) LONGITUDE: 73° 55.9' W ( -73.93131)
The primary bench mark is a disk set vertically in the concrete abutment wing
wall of the railroad bridge, 45.50 m (149.3 ft) SE of a fire hydrant, 8.80 m
(28.9 ft) ENE of the NE steel support beam for the bridge, 5.51 m (18.1 ft) N of
a manhole, 4.12 m (13.5 ft) NW of the E end of the abutment and 0.8 m (2.6 ft)
above the sidewalk.
BENCH MARK STAMPING: 8902 B 2014
DESIGNATION: 851 8902 B
MONUMENTATION: Bench Mark disk VM#: 21109
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: In bedrock outcrop OPUS PID#: BBDM50
LATITUDE: 40° 52.2' N ( 40.86956) LONGITUDE: 73° 55.9' W ( -73.93153)
The bench mark is a disk set in a bedrock outcrop on the W side of the path,
35.85 m (117.6 ft) SSW of the N end of the bedrock outcrop, 10.11 m (33.2 ft)
WSW of a lamp post, 5.95 m (19.5 ft) WNW of the centerline of the asphalt path,
5.53 m (18.1 ft) NNE of the S end of the bedrock outcrop, 4.30 m (14.1 ft) WNW
of the NW corner of the stone capped retaining wall, and 1.20 m (3.9 ft) above
the asphalt path.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8518902 PUBLICATION DATE: 12/04/2014
Name: NYC, DYCKMAN ST., FERRY SLIP
NY
NOAA Chart: 12345 Latitude: 40° 52.1' N ( 40.86830)
USGS Quad: CENTRAL PARK Longitude: 73° 56.0' W ( -73.93330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8902 A 2014
DESIGNATION: 851 8902 A
MONUMENTATION: Bench Mark disk VM#: 21110
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Concrete retaining wall OPUS PID:
LATITUDE: 40° 52.1' N ( 40.86761) LONGITUDE: 73° 55.9' W ( -73.93231)
The bench mark is a disk set in a concrete retaining wall, 58.00 m (190.3 ft)
SSW of the N end of the wall, 47.72 m (156.6 ft) NNE of the gate in the fence to
the Inwood Canoe Club, 16.05 m (52.7 ft) NNE of the first steel support for the
highway, 15.16 m (49.7 ft) NNE of the S end of the concrete wall, 0.22 m (0.7
ft) SW of a lamp post on top of the wall, and 0.87 m (2.9 ft) above the path.
BENCH MARK STAMPING: 8902 C 2014
DESIGNATION: 851 8902 C
MONUMENTATION: Bench Mark disk VM#: 21112
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Bedrock ledge OPUS PID:
LATITUDE: 40° 52.1' N ( 40.86853) LONGITUDE: 73° 55.8' W ( -73.93067)
The bench mark is a disk set in a bedrock ledge, 23.65 m (77.6 ft) N of the
first light post E of the highway bridge on the N side of the street, 8.93 m
(29.3 ft) SE of the NE corner of the bridge abutment that is outside of the
security fence, 8.59 m (28.2 ft) ESE of the SE corner of the security fence,
3.52 m (11.5 ft) NE of the NE side of the sidewalk, and 1.10 m (3.6 ft) above
the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8518902 PUBLICATION DATE: 12/04/2014
Name: NYC, DYCKMAN ST., FERRY SLIP
NY
NOAA Chart: 12345 Latitude: 40° 52.1' N ( 40.86830)
USGS Quad: CENTRAL PARK Longitude: 73° 56.0' W ( -73.93330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8902 D 2014
DESIGNATION: 851 8902 D
MONUMENTATION: Bench Mark disk VM#: 21113
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Low bedrock outcrop OPUS PID:
LATITUDE: 40° 52.0' N ( 40.86747) LONGITUDE: 73° 55.8' W ( -73.92933)
The bench mark is a disk set in a low bedrock outcrop on the N side of the
street, 34.08 m (111.8 ft) SE of a fire hydrant, 20.71 m (67.9 ft) WNW of the
center of the stairs to the men's restrooms in the New York city parks brick
building, 14.33 m (47.0 ft) NW of a 0.8 m (2.6 ft) diameter tree, 13.75 m (45.1
ft) N of light post M007227, 5.02 m (16.5 ft) NE of the N side of the sidewalk
and 0.67 m (2.2 ft) NE of the S side of the exposed bedrock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8518902 PUBLICATION DATE: 12/04/2014
Name: NYC, DYCKMAN ST., FERRY SLIP
NY
NOAA Chart: 12345 Latitude: 40° 52.1' N ( 40.86830)
USGS Quad: CENTRAL PARK Longitude: 73° 56.0' W ( -73.93330)
T I D A L D A T U M S
Tidal datums at NYC, DYCKMAN ST., FERRY SLIP 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 = 1.343
MEAN HIGH WATER MHW = 1.264
North American Vertical Datum NAVD88 = 0.731
MEAN SEA LEVEL MSL = 0.702
MEAN TIDE LEVEL MTL = 0.658
MEAN LOW WATER MLW = 0.052
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 3 1939 4.522 3.258
8902 B 2014 5.679 4.415
8902 A 2014 3.732 2.468
8902 C 2014 5.367 4.103
8902 D 2014 5.756 4.492
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8518902 PUBLICATION DATE: 12/04/2014
Name: NYC, DYCKMAN ST., FERRY SLIP
NY
NOAA Chart: 12345 Latitude: 40° 52.1' N ( 40.86830)
USGS Quad: CENTRAL PARK Longitude: 73° 56.0' W ( -73.93330)
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.