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Datums Page Page 1 of 8
Station ID: 8724231 PUBLICATION DATE: 04/01/2004
Name: BIG PINE KEY NORTH END
FL
NOAA Chart: 11448 Latitude: 24° 44.7' N ( 24.74500)
USGS Quad: SUMMERLAND KEY Longitude: 81° 23.7' W ( -81.39500)
To reach the tidal bench marks from the post office in Marathon, proceed SW on
U.S. Highway 1 for 30.7 km (19.1 mi) to Big Pine Key, then turn right and
proceed NW on State Highway 940 (Key Deer Boulevard) for 7.2 km (4.5 mi), then
north onto a dim track road for 2.4 km (1.5 mi) to the north end of Big Pine
Key. The bench marks are located in a clearing at the north tip of the Key.
The tide gage and staff were located offshore, north of the north tip, SE of
channel marker No. 26.
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: 8724231 PUBLICATION DATE: 04/01/2004
Name: BIG PINE KEY NORTH END
FL
NOAA Chart: 11448 Latitude: 24° 44.7' N ( 24.74500)
USGS Quad: SUMMERLAND KEY Longitude: 81° 23.7' W ( -81.39500)
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: PINEY RM 1 1935
DESIGNATION: PINEY RM 1
ALIAS: 2
MONUMENTATION: Reference Mark disk VM#: 11347
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AA0223
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 24° 44.6' N ( 24.74330) LONGITUDE: 81° 23.7' W ( -81.39500)
The primary bench mark is a disk set flush in a concrete monument, 34 m (110 ft)
NW of the centerline of the track road, 24 m (78 ft) NE of bench mark PINEY
1935, and 0.15 m (0.5 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 8724231 PUBLICATION DATE: 04/01/2004
Name: BIG PINE KEY NORTH END
FL
NOAA Chart: 11448 Latitude: 24° 44.7' N ( 24.74500)
USGS Quad: SUMMERLAND KEY Longitude: 81° 23.7' W ( -81.39500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: PINEY 1935
DESIGNATION: PINEY
ALIAS: 1
MONUMENTATION: Triangulation Station disk VM#: 11346
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AA0222
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 24° 44.6' N ( 24.74330) LONGITUDE: 81° 23.7' W ( -81.39500)
The bench mark is a disk set flush in a concrete monument, 201 m (660 ft) SE of
the north point of Big Pine Key, 70 m (231 ft) west of the edge of mangroves
along the east shore, 60 m (198 ft) east of the edge of mangroves along the west
shore, 41 m (135 ft) NW of the centerline of the track road, 0.40 m (1.3 ft) NE
of a witness post, and 0.15 m (0.5 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 8724231 PUBLICATION DATE: 04/01/2004
Name: BIG PINE KEY NORTH END
FL
NOAA Chart: 11448 Latitude: 24° 44.7' N ( 24.74500)
USGS Quad: SUMMERLAND KEY Longitude: 81° 23.7' W ( -81.39500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: PINEY RM 2 1935
DESIGNATION: PINEY RM 2
ALIAS: 3
MONUMENTATION: Reference Mark disk VM#: 11348
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AA0221
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 24° 44.6' N ( 24.74330) LONGITUDE: 81° 23.7' W ( -81.39500)
The bench mark is a disk set flush in a concrete monument, 36.48 m (119.7 ft)
south of bench mark PINEY RM 1 1935, 32 m (105 ft) NW of the centerline of the
track road, 25 m (81 ft) SE of bench mark PINEY 1935, 0.67 m (2.2 ft) NE of a
witness post, and 0.15 m (0.5 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 8724231 PUBLICATION DATE: 04/01/2004
Name: BIG PINE KEY NORTH END
FL
NOAA Chart: 11448 Latitude: 24° 44.7' N ( 24.74500)
USGS Quad: SUMMERLAND KEY Longitude: 81° 23.7' W ( -81.39500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: Q 328 1970
DESIGNATION: Q 328
MONUMENTATION: Bench Mark disk VM#: 11349
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AA0219
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 24° 44.6' N ( 24.74330) LONGITUDE: 81° 23.7' W ( -81.39500)
The bench mark is a disk set in the top of outcropping bedrock, 10.52 m (34.5
ft) east of bench mark R 328 1970, 4.72 m (15.5 ft) NE of the centerline of the
track road, and 1.07 m (3.5 ft) south of a metal witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 8724231 PUBLICATION DATE: 04/01/2004
Name: BIG PINE KEY NORTH END
FL
NOAA Chart: 11448 Latitude: 24° 44.7' N ( 24.74500)
USGS Quad: SUMMERLAND KEY Longitude: 81° 23.7' W ( -81.39500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: R 328 1970
DESIGNATION: R 328
MONUMENTATION: Bench Mark disk VM#: 11350
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AA0220
SETTING CLASSIFICATION: Outcropping bedrock OPUS PID:
LATITUDE: 24° 44.6' N ( 24.74330) LONGITUDE: 81° 23.7' W ( -81.39500)
The bench mark is a disk set in the top of outcropping bedrock, 31.70 m (104.0
ft) east of bench mark PINEY RM 2 1935, 3 m (11 ft) NW of the centerline of the
track road, and 0.79 m (2.6 ft) NNW of a witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 8724231 PUBLICATION DATE: 04/01/2004
Name: BIG PINE KEY NORTH END
FL
NOAA Chart: 11448 Latitude: 24° 44.7' N ( 24.74500)
USGS Quad: SUMMERLAND KEY Longitude: 81° 23.7' W ( -81.39500)
T I D A L D A T U M S
Tidal datums at BIG PINE KEY NORTH END based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: October 1974 - November 1974
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 = 0.520
North American Vertical Datum NAVD88 = 0.479
MEAN HIGH WATER MHW = 0.462
MEAN TIDE LEVEL MTL = 0.263
MEAN SEA LEVEL MSL = 0.221
MEAN LOW WATER MLW = 0.063
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
PINEY RM 1 1935 0.777 0.315
PINEY 1935 0.775 0.313
PINEY RM 2 1935 0.848 0.386
Q 328 1970 0.876 0.414
R 328 1970 0.792 0.330
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 8724231 PUBLICATION DATE: 04/01/2004
Name: BIG PINE KEY NORTH END
FL
NOAA Chart: 11448 Latitude: 24° 44.7' N ( 24.74500)
USGS Quad: SUMMERLAND KEY Longitude: 81° 23.7' W ( -81.39500)
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.