U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8723824 PUBLICATION DATE: 02/08/2016
Name: LIGNUMVITAE KEY EAST
FL
NOAA Chart: 11449 Latitude: 24° 54.2' N ( 24.90330)
USGS Quad: UPPER MATECUMBE KEY Longitude: 80° 41.7' W ( -80.69500)
To reach the tidal bench marks from the west end of the U.S. Highway 1 bridge
over Indian Key Channel, proceed NNE by boat 2.3 km (1.4 statute mi) to the
concrete "T" shaped pier on the eastern side of Lignumvitae Key. The bench
marks are located on the eastern shore of the Key. The tide gage and staff were
located on the south side of the concrete pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 5 1975
DESIGNATION: 872 3824 TIDAL 5
MONUMENTATION: DJ VM#: 10957
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: In rock outcrop OPUS PID:
LATITUDE: 24° 54.2' N ( 24.90330) LONGITUDE: 80° 41.7' W ( -80.69500)
The primary bench mark is a disk set in a rock outcrop located SSW of the pier,
66.57 m (218.4 ft) ESE of bench mark NO 4 1975, and 55.63 m (182.5 ft) east of
the east leg of a windmill tower.
BENCH MARK STAMPING: NO 1 1975
DESIGNATION: 872 3824 TIDAL 1
MONUMENTATION: DJ VM#: 10953
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Abutments and piers of large bridges OPUS PID:
LATITUDE: 24° 54.2' N ( 24.90330) LONGITUDE: 80° 41.7' W ( -80.69500)
The bench mark is a disk set flush in the concrete pier, 76 m (249 ft) east of
bench mark NO 3 1975, 1.68 m (5.5 ft) south of the north side of the walkway,
and 0.15 m (0.5 ft) east of the shore end of the pier.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8723824 PUBLICATION DATE: 02/08/2016
Name: LIGNUMVITAE KEY EAST
FL
NOAA Chart: 11449 Latitude: 24° 54.2' N ( 24.90330)
USGS Quad: UPPER MATECUMBE KEY Longitude: 80° 41.7' W ( -80.69500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 2 1975
DESIGNATION: LIGNUMVITAE KEY NO 2
MONUMENTATION: DB VM#: 10954
AGENCY: National Ocean Survey (NOS) IDB PID#: AA1798
SETTING CLASSIFICATION: Piles and poles (e.g. spike in utility
pole) OPUS PID:
LATITUDE: 24° 54.2' N ( 24.90330) LONGITUDE: 80° 41.7' W ( -80.69500)
The bench mark is a disk set flush in a concrete flagpole base, and 19.05 m
(62.5 ft) north of bench mark NO 3 1975.
BENCH MARK STAMPING: NO 3 1975
DESIGNATION: 872 3824 TIDAL 3
MONUMENTATION: DJ VM#: 10955
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Pavements (street, sidewalk, curb,
apron, etc.) OPUS PID:
LATITUDE: 24° 54.2' N ( 24.90330) LONGITUDE: 80° 41.7' W ( -80.69500)
The bench mark is a disk set flush in a concrete sidewalk, 6.86 m (22.6 ft) from
the NE corner of a stone house, and 3 m (9 ft) from the NW corner of a stone
house.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8723824 PUBLICATION DATE: 02/08/2016
Name: LIGNUMVITAE KEY EAST
FL
NOAA Chart: 11449 Latitude: 24° 54.2' N ( 24.90330)
USGS Quad: UPPER MATECUMBE KEY Longitude: 80° 41.7' W ( -80.69500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 4 1975
DESIGNATION: 872 3824 TIDAL 4
MONUMENTATION: DJ VM#: 10956
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: In rock outcrop OPUS PID:
LATITUDE: 24° 54.2' N ( 24.90330) LONGITUDE: 80° 41.7' W ( -80.69500)
The bench mark is a disk set in rock outcrop, 15 m (49 ft) south of the east
corner of the stone house, and 5 m (17 ft) east of the south corner of the stone
house.
BENCH MARK STAMPING:
DESIGNATION: 872 3824 NO STAMPING 1
MONUMENTATION: Z VM#: 10958
AGENCY: Unknown IDB PID#:
SETTING CLASSIFICATION: Set into the top of a concrete monumentOPUS PID:
LATITUDE: 24° 54.2' N ( 24.90330) LONGITUDE: 80° 41.7' W ( -80.69500)
The bench mark is a disk set in a tile pipe filled with concrete, 22 m (71 ft)
SSW of the most easterly cannon on the east side of the dock, 0.06 m (0.2 ft)
above the concrete surface.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8723824 PUBLICATION DATE: 02/08/2016
Name: LIGNUMVITAE KEY EAST
FL
NOAA Chart: 11449 Latitude: 24° 54.2' N ( 24.90330)
USGS Quad: UPPER MATECUMBE KEY Longitude: 80° 41.7' W ( -80.69500)
T I D A L D A T U M S
Tidal datums at LIGNUMVITAE KEY EAST based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: June 1975 - June 1975
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8724580 KEY WEST
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.240
MEAN HIGH WATER MHW = 0.208
MEAN TIDE LEVEL MTL = 0.107
MEAN SEA LEVEL MSL = 0.105
MEAN LOW WATER MLW = 0.006
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 5 1975 0.967 0.759
NO 1 1975 1.413 1.205
NO 2 1975 2.813 2.605
NO 3 1975 3.359 3.151
NO 4 1975 3.326 3.118
872 3824 NO STAMPING 1 1.939 1.731
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8723824 PUBLICATION DATE: 02/08/2016
Name: LIGNUMVITAE KEY EAST
FL
NOAA Chart: 11449 Latitude: 24° 54.2' N ( 24.90330)
USGS Quad: UPPER MATECUMBE KEY Longitude: 80° 41.7' W ( -80.69500)
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.