U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8724951 PUBLICATION DATE: 02/05/2004
Name: PANTHER KEY
FL
NOAA Chart: 11429 Latitude: 25° 51.5' N ( 25.85830)
USGS Quad: PANTHER KEY Longitude: 81° 32.3' W ( -81.53830)
To reach the tidal bench marks from Royal Palm Hammock, proceed east on U.S.
Highway 41 for 10 km (6 mi) to the Remuda Ranch Marina, then proceed by boat
south on Fakha Union Canal to Fakha Union River, then follow
privately-maintained navigational aids to the vicinity of Daybeacon #8, then
proceed south to the SE end of a large key located directly NE of Panther Key,
(total distance by boat is about 10.5 km (7.5 nm) ). The bench marks are
located near the southern tip of the key, separated from Panther Key by a narrow
creek. The tide gage and staff were located 30 m (100 ft) offshore and south of
bench mark 4951 A 1978.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 4951 A 1978
DESIGNATION: 872 4951 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 9715
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 25° 51.5' N ( 25.85830) LONGITUDE: 81° 32.3' W ( -81.53830)
The primary bench mark is a disk located near a mangrove tree on the southern
tip of the key, 6 m (21 ft) south of a small tidal pond, 6 m (20 ft) NW of the
water's edge, 1.40 m (4.6 ft) NE of a 0.15 m (0.5 ft) diameter mangrove tree,
and 0.15 m (0.5 ft) north of a witness post. The bench mark is set 0.30 m (1.0
ft) above ground level, crimped to the top of a galvanized steel rod driven 9.1
m (30 ft) to refusal, and encased in a PVC pipe.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8724951 PUBLICATION DATE: 02/05/2004
Name: PANTHER KEY
FL
NOAA Chart: 11429 Latitude: 25° 51.5' N ( 25.85830)
USGS Quad: PANTHER KEY Longitude: 81° 32.3' W ( -81.53830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4951 B 1978
DESIGNATION: 872 4951 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 9716
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 25° 51.5' N ( 25.85830) LONGITUDE: 81° 32.3' W ( -81.53830)
The bench mark is a disk located 29.87 m (98.0 ft) north of the mangrove edge,
26.52 m (87.0 ft) north of bench mark 4951 A 1978, 6.58 m (21.6 ft) east of a
0.21 m (0.7 ft) diameter mangrove tree, and 0.30 m (1.0 ft) north of a witness
post. The bench mark is set 0.40 m (1.3 ft) above ground level, crimped to the
top of a galvanized steel rod driven 11.6 m (38 ft) to refusal, and encased in a
PVC pipe. (NOTE: Mark will be submerged at high tide.)
BENCH MARK STAMPING: 4951 C 1978
DESIGNATION: 872 4951 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 9717
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 25° 51.5' N ( 25.85830) LONGITUDE: 81° 32.3' W ( -81.53830)
The bench mark is a disk located 39.93 m (131.0 ft) SW of bench mark 4951 B
1978, 26.52 m (87.0 ft) west of bench mark 4951 A 1978, 12.80 m (42.0 ft) SE of
a 0.30 m (1.0 ft) diameter mangrove tree, 8.23 m (27.0 ft) SW of an 0.21 m (0.7
ft) diameter mangrove tree, 7 m (23 ft) north of the water's edge, 5.36 m (17.6
ft) east of a 0.24 m (0.8 ft) diameter mangrove tree, and 0.21 m (0.7 ft) south
of a witness post. The bench mark is set 9 cm (0.3 ft) above ground level,
crimped to the top of a galvanized steel rod driven 11.6 m (38 ft) to refusal,
and encased in a PVC pipe. (NOTE: Mark will be submerged at high tide.)
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8724951 PUBLICATION DATE: 02/05/2004
Name: PANTHER KEY
FL
NOAA Chart: 11429 Latitude: 25° 51.5' N ( 25.85830)
USGS Quad: PANTHER KEY Longitude: 81° 32.3' W ( -81.53830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4951 D 1978
DESIGNATION: 872 4951 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 9718
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 25° 51.5' N ( 25.85830) LONGITUDE: 81° 32.3' W ( -81.53830)
The bench mark is a disk located on a shell ridge, 28.65 m (94.0 ft) NW of bench
mark 4951 C 1978, 8.53 m (28.0 ft) NE of the mangrove edge, 3 m (11 ft) SW of a
small pond, 2.93 m (9.6 ft) SW of a 0.24 m (0.8 ft) diameter white mangrove
tree, and 0.12 m (0.4 ft) east of a witness post. The bench mark is set 9 cm
(0.3 ft) above ground level, crimped to the top of a galvanized steel rod driven
9.8 m (32 ft) to refusal, and encased in a PVC pipe. (NOTE: Mark will be
submerged at high tide.)
BENCH MARK STAMPING: 4951 E 1978
DESIGNATION: 872 4951 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 9719
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 25° 51.5' N ( 25.85830) LONGITUDE: 81° 32.3' W ( -81.53830)
The bench mark is a disk located 36.88 m (121.0 ft) north of bench mark 4951 A
1978, 6.10 m (20.0 ft) NW of the water's edge, 5.73 m (18.8 ft) north of a
mangrove tree located at the water's edge, 2.44 m (8.0 ft) NE of a 0.21 m (0.7
ft) diameter mangrove tree, and 1.68 m (5.5 ft) NW of a witness sign on a tree.
The bench mark is 0.12 m (0.4 ft) above ground level, crimped to the top of a
galvanized steel rod driven 9.1 m (30 ft) to refusal, and encased in a PVC pipe.
(NOTE: Mark will be submerged at high tide.)
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8724951 PUBLICATION DATE: 02/05/2004
Name: PANTHER KEY
FL
NOAA Chart: 11429 Latitude: 25° 51.5' N ( 25.85830)
USGS Quad: PANTHER KEY Longitude: 81° 32.3' W ( -81.53830)
T I D A L D A T U M S
Tidal datums at PANTHER KEY based on:
LENGTH OF SERIES: 4 MONTHS
TIME PERIOD: December 1977 - March 1978
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8724919 CHOKOLOSKEE
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.286
MEAN HIGH WATER MHW = 1.206
MEAN TIDE LEVEL MTL = 0.701
MEAN SEA LEVEL MSL = 0.701
MEAN LOW WATER MLW = 0.196
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
4951 A 1978 1.274 0.068
4951 B 1978 0.949 -0.257
4951 C 1978 0.996 -0.210
4951 D 1978 1.083 -0.123
4951 E 1978 1.019 -0.187
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8724951 PUBLICATION DATE: 02/05/2004
Name: PANTHER KEY
FL
NOAA Chart: 11429 Latitude: 25° 51.5' N ( 25.85830)
USGS Quad: PANTHER KEY Longitude: 81° 32.3' W ( -81.53830)
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.