[Talk-us] Incorrect Summit Elevations - Colorado
Greg Troxel
gdt at ir.bbn.com
Wed Feb 10 13:12:28 GMT 2010
I somewhat glibly asked "what should the height spec be" and I think the
answer should be "orthometric heights based on WGS84 and the current
associated geoid model".
When converting to feet there is the wrinkle of US survey feet vs the
international foot. This matters in state plane systems, but NGS is all
metric now, and so is OSM. Plus that's 2 ppm which won't matter for
elevations.
I seen the same height issue. Mt Washburn in Yellowstone had a sign
that said 10243 and I think some database said something different
(perhaps a control point at the top) and wikipedia says 10223.
Looking up in the NGS database yields 10249 feet in NAVD88. But then
there's the question of if the mark is at the summit exactly, and what
that means when there has been construction.
The NGS Data Sheet
See file dsdata.txt for more information about the datasheet.
DATABASE = ,PROGRAM = datasheet, VERSION = 7.80
1 National Geodetic Survey, Retrieval Date = FEBRUARY 10, 2010
PY1215 ***********************************************************************
PY1215 CBN - This is a Cooperative Base Network Control Station.
PY1215 DESIGNATION - WASHBURN
PY1215 PID - PY1215
PY1215 STATE/COUNTY- WY/PARK
PY1215 USGS QUAD - MOUNT WASHBURN (1986)
PY1215
PY1215 *CURRENT SURVEY CONTROL
PY1215 ___________________________________________________________________
PY1215* NAD 83(2007)- 44 47 51.55976(N) 110 26 01.95602(W) ADJUSTED
PY1215* NAVD 88 - 3123.8 (meters) 10249. (feet) GPS OBS
PY1215 ___________________________________________________________________
PY1215 EPOCH DATE - 2002.00
PY1215 X - -1,583,522.444 (meters) COMP
PY1215 Y - -4,250,269.975 (meters) COMP
PY1215 Z - 4,473,615.267 (meters) COMP
PY1215 LAPLACE CORR- 4.97 (seconds) USDV2009
PY1215 ELLIP HEIGHT- 3115.591 (meters) (02/10/07) ADJUSTED
PY1215 GEOID HEIGHT- -8.56 (meters) GEOID09
PY1215
PY1215 ------- Accuracy Estimates (at 95% Confidence Level in cm) --------
PY1215 Type PID Designation North East Ellip
PY1215 -------------------------------------------------------------------
PY1215 NETWORK PY1215 WASHBURN 1.35 1.86 8.08
PY1215 -------------------------------------------------------------------
PY1215
PY1215.The horizontal coordinates were established by GPS observations
PY1215.and adjusted by the National Geodetic Survey in February 2007.
PY1215
PY1215.The datum tag of NAD 83(2007) is equivalent to NAD 83(NSRS2007).
PY1215.See National Readjustment for more information.
PY1215.The horizontal coordinates are valid at the epoch date displayed above.
PY1215.The epoch date for horizontal control is a decimal equivalence
PY1215.of Year/Month/Day.
PY1215
PY1215.The orthometric height was determined by GPS observations and a
PY1215.high-resolution geoid model.
PY1215
PY1215.The X, Y, and Z were computed from the position and the ellipsoidal ht.
PY1215
PY1215.The Laplace correction was computed from USDV2009 derived deflections.
PY1215
PY1215.The ellipsoidal height was determined by GPS observations
PY1215.and is referenced to NAD 83.
PY1215
PY1215.The geoid height was determined by GEOID09.
PY1215
PY1215; North East Units Scale Factor Converg.
PY1215;SPC WYWC - 478,758.898 466,773.343 MT 1.00015569 -1 11 11.9
PY1215;SPC WYWC - 1,570,728.15 1,531,405.54 sFT 1.00015569 -1 11 11.9
PY1215;UTM 12 - 4,960,628.757 544,775.951 MT 0.99962465 +0 23 56.0
PY1215
PY1215! - Elev Factor x Scale Factor = Combined Factor
PY1215!SPC WYWC - 0.99951174 x 1.00015569 = 0.99966736
PY1215!UTM 12 - 0.99951174 x 0.99962465 = 0.99913658
PY1215
PY1215: Primary Azimuth Mark Grid Az
PY1215:SPC WYWC - WASHBURN AZ MK 091 31 57.5
PY1215:UTM 12 - WASHBURN AZ MK 089 56 49.6
PY1215
PY1215|---------------------------------------------------------------------|
PY1215| PID Reference Object Distance Geod. Az |
PY1215| dddmmss.s |
PY1215| CQ7583 WASHBURN AZ MK 0902045.6 |
PY1215| CQ7584 WASHBURN RM 1 8.553 METERS 09654 |
PY1215| PY1209 PELICAN CONE LOOKOUT HOUSE APPROX.25.3 KM 1305835.0 |
PY1215| PY1216 MT WASHBURN LOOKOUT HOUSE 25.656 METERS 17048 |
PY1215| CQ7585 WASHBURN RM 2 20.495 METERS 17150 |
PY1215|---------------------------------------------------------------------|
PY1215
PY1215 SUPERSEDED SURVEY CONTROL
PY1215
PY1215 ELLIP H (09/07/01) 3115.586 (m) GP( ) 4 1
PY1215 NAD 83(1992)- 44 47 51.55863(N) 110 26 01.95438(W) AD( ) B
PY1215 ELLIP H (05/15/92) 3115.678 (m) GP( ) 4 2
PY1215 NAD 83(1986)- 44 47 51.54934(N) 110 26 01.94132(W) AD( ) 1
PY1215 NAD 27 - 44 47 51.77500(N) 110 25 59.21900(W) AD( ) 1
PY1215 NGVD 29 (04/22/91) 3122.7 (m) 10245. (f) GPS OBS
PY1215
PY1215.Superseded values are not recommended for survey control.
PY1215.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
PY1215.See file dsdata.txt to determine how the superseded data were derived.
PY1215
PY1215_U.S. NATIONAL GRID SPATIAL ADDRESS: 12TWQ4477560628(NAD 83)
PY1215_MARKER: DO = NOT SPECIFIED OR SEE DESCRIPTION
PY1215_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
PY1215_SP_SET: SET IN TOP OF CONCRETE MONUMENT
PY1215_MAGNETIC: N = NO MAGNETIC MATERIAL
PY1215_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
PY1215+STABILITY: SURFACE MOTION
PY1215_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
PY1215+SATELLITE: SATELLITE OBSERVATIONS - June 11, 2006
PY1215
PY1215 HISTORY - Date Condition Report By
PY1215 HISTORY - 1950 MONUMENTED CGS
PY1215 HISTORY - 1958 GOOD USGS
PY1215 HISTORY - 1983 GOOD LOCENG
PY1215 HISTORY - 1987 GOOD NGS
PY1215 HISTORY - 20060611 GOOD MD-005
PY1215
PY1215 STATION DESCRIPTION
PY1215
PY1215'DESCRIBED BY COAST AND GEODETIC SURVEY 1950 (EBL)
PY1215'STATION IS LOCATED ON MT. WASHBURN, THE HIGHEST MOUNTAIN IN THE
PY1215'WASHBURN RANGE. ABOUT 6.5 MILES AIR LINE NORTHEAST OF THE
PY1215'CANYON RANGER STATION. 14 FEET SOUTH OF A ROCK WALL. 18 FEET
PY1215'EAST OF END OF WALL WHERE ROAD REACHES THE TOP. THE DISK IS
PY1215'SET FLUSH WITH THE PAVEMENT AND IS STAMPED WASHBURN 1950.
PY1215'
PY1215'REFERENCE MARK NO. 1 IS 68 FEET NORTH OF THE NORTHEAST CORNER
PY1215'OF THE LOOKOUT HOUSE. 11 FEET SOUTH OF A ROCK WALL. THE MARK
PY1215'IS FLUSH WITH THE PAVEMENT AND THE DISK IS STAMPED WASHBURN
PY1215'NO 1 1950.
PY1215'
PY1215'REFERENCE MARK NO. 2 IS 17 FEET NORTHWEST OF THE NORTHEAST
PY1215'CORNER OF THE LOOKOUT HOUSE. 5 FEET NORTH OF THE NORTH SIDE
PY1215'OF THE LOOKOUT HOUSE. THE MARK IS SET FLUSH IN THE TOP OF THE
PY1215'LOOKOUT HOUSE SEPTIC TANK AND THE DISK IS STAMPED WASHBURN
PY1215'NO 2 1950.
PY1215'
PY1215'THE AZIMUTH MARK IS ON A ROCKY KNOLL EAST OF THE STATION.
PY1215'15 FEET NORTH OF THE LOOKOUT ORIENTATION STAKE. THE MARK IS
PY1215'SET IN A BOULDER THAT PROJECTS 8 INCHES AND THE DISK IS STAMPED
PY1215'WASHBURN 1950.
PY1215'
PY1215'TO REACH FROM THE CANYON RANGER STATION, GO NORTH ON THE TOWER
PY1215'JUNCTION ROAD FOR 6.3 MILES TO TOP OF HILL AND SIGN DUNRAVEN
PY1215'PASS, AND ROAD ON RIGHT WITH LOCKED BARRIER. TURN RIGHT THROUGH
PY1215'BARRIER AND FOLLOW MAIN ROAD UP HILL FOR 3.1 MILES TO A PARKING
PY1215'AREA ON THE RIGHT. (BEAR RIGHT UP THE SLOPE TO THE TOP AND
PY1215'THE AZIMUTH MARK). CONTINUE ON UP HILL FOR 0.3 MILE TO TOP
PY1215'OF HILL AND THE STATION.
PY1215
PY1215 STATION RECOVERY (1958)
PY1215
PY1215'RECOVERY NOTE BY US GEOLOGICAL SURVEY 1958
PY1215'RECOVERED.
PY1215'
PY1215'STATION MARK--STANDARD USC AND GS DISK, FLUSH WITH PAVEMENT, AND
PY1215'STAMPED ---WASHBURN 1950---.
PY1215
PY1215 STATION RECOVERY (1983)
PY1215
PY1215'RECOVERY NOTE BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1983 (MK)
PY1215'WASHBURN 1950 RECOVERED GOOD (TRIANGULATION MARK).
PY1215'
PY1215'WASHBURN NO 1 1950 RECOVERED GOOD (REFERENCE MARK).
PY1215'
PY1215'WASHBURN NO 2 1950 RECOVERED GOOD (REFERENCE MARK).
PY1215'
PY1215'WASHBURN 1950 RECOVERED GOOD (AZIMUTH MARK).
PY1215'
PY1215'DISTANCE AND DIRECTION FROM NEAREST TOWN--IN Y.N.P., ABOUT 6-1/2
PY1215'MILE AIRLINE NE OF CANYON RANGER STA.
PY1215
PY1215 STATION RECOVERY (1987)
PY1215
PY1215'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1987 (MRM)
PY1215'THE STATION WAS RECOVERED AT THIS DATE.
PY1215'REFERENCE MARKS WERE NOT SEARCHED FOR AT THIS DATE. THE 1950 DATA
PY1215'APPEARS TO BE CORRECT EXCEPT THAT THE AREA HAS BEEN PAVED.
PY1215'
PY1215'OWNERSHIP--NATIONAL PARK SERVICE, FOR KEY TO LOCKED GATE CONTACT
PY1215'CANYON RANGER STATION, PHONE 307-242-7201 EXT 6201 OR TOWER RANGER
PY1215'STATION, PHONE 307-344-7746.
PY1215'
PY1215'TO REACH THE STATION FROM CANYON JUNCTION IN YELLOWSTONE NATIONAL
PY1215'PARK, GO NORTH FOR 15.8 KM (9.8 MI) ON THE CANYON-TOWER ROAD TO A
PY1215'PAVED ROAD RIGHT AT SIGN, CHITTENDEN ROAD TO MOUNT WASHBURN (NOTE,
PY1215'THIS ROAD IS 10.0 KM (6.2 MI) SOUTH OF TOWER JUNCTION). TURN RIGHT
PY1215'AND GO SOUTH, PASSING THROUGH LOCKED GATE, FOR 2.1 KM (1.3 MI) TO A
PY1215'PARKING AREA ON THE LEFT, AT A LOCKED POLE GATE ACROSS TRACK ROAD.
PY1215'PASS THROUGH GATE AND CONTINUE AHEAD FOR 4.8 KM (3.0 MI) ON THE
PY1215'TRACK ROAD TO THE PARKING LOT AT LOOKOUT TOWER AND THE STATION ON
PY1215'THE LEFT.
PY1215'
PY1215'THE STATION IS A STANDARD CGS DISK
PY1215'STAMPED---WASHBURN 1950---,
PY1215'SET INTO THE TOP OF A ROUND CONCRETE MONUMENT
PY1215'30 CM IN DIAMETER FLUSH WITH PAVED PARKING LOT. LOCATED
PY1215'21.9 METERS (71.8 FT) NORTH FROM THE NORTHWEST CORNER OF LOOKOUT
PY1215'BUILDING,
PY1215'4.0 METERS (13.1 FT) EAST FROM A LOW WALL AT JUNCTION OF ROAD AND
PY1215'PARKING LOT,
PY1215'2.7 METERS (9.0 FT) EAST FROM THE CENTER OF A SAWED-OFF 50-CM WOOD
PY1215'POLE,
PY1215'1.4 METERS (4.5 FT) EAST-NORTHEAST FROM THE EAST ONE OF FOUR 5-CM
PY1215'BOLTS PROJECTING 15 CM,
PY1215'0.7 METERS (2.2 FT) SOUTH FROM AN OLD UTILITY POLE USED AS A
PY1215'PARKING CURB AND IN LINE WITH THE WEST WALL OF THE LOOKOUT BUILDING.
PY1215'NOTE, THE OLD DESCRIPTION INDICATES AN UNDERGROUND MARK.
PY1215'
PY1215'TI4100 GPS SURVEY FOR CRUSTAL MOTION IN YELLOWSTONE PARK AND HEBGEN
PY1215'LAKE AREAS OF WYOMING, MONTANA AND IDAHO, AUGUST - SEPTEMBER 1987.
PY1215'
PY1215'THIS STATION SUITABLE FOR GPS SURVEYS.
PY1215'
PY1215'DESCRIBED BY G.R. HEID.
PY1215
PY1215 STATION RECOVERY (2006)
PY1215
PY1215'RECOVERY NOTE BY BALTIMORE COUNTY MARYLAND 2006 (PAS)
PY1215'MARK WAS FOUND IN GOOD CONDITION ON A VACATION TRIP. DATA SHEET HAS
PY1215'NOT AVAILABLE SO DIMENSIONS AND REFERENCES IN THE STATION DESCRIPTION
PY1215'COULD NOT BE VERIFIED.
*** retrieval complete.
Elapsed Time = 00:00:01
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