gps on bms rocky mountain region (co,wy, mt) part iii ds ...€¦ · geodesy.noaa.gov. gps on bms....
TRANSCRIPT
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geodesy.noaa.gov
GPS on BMsRocky Mountain Region
(CO,WY, MT)Part III
DS-WorldJune 21, 2018
Pam FromhertzRocky Mountain Regional [email protected]
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Topics• Quick Review of Part I and II• CO-WY-MT map and sign up sheet• OPUS share • Questions
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NGS Advisors
Other NGS offices
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Geodetic Coordinators
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State Contacts
• CO – [email protected]– John Hunter, PLSC (Joey Stone, Thomas
Breitnauer)
• MT – Joshua Phillips, MARLS– Tyson Olinger, MDT– Erin Fashoway, MAGIP– Wally Gladstone, Tribal
• WY – Mark Corbridge, WYDOT, PLSW– Mike Londe, BLM Federal Partner– Karen Rodgers, WYGEO
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Ellipsoid, Geoid, and Orthometric Heights
(NAVD88) H
H = Orthometric Height (leveling) H = h - N
TOPOGRAPHIC SURFACE
h = Ellipsoidal Height (GPS)
N = Geoid Height (model)
h (NAD83)
Ellipsoid
N
Geoid Geoid Height(GEOID12B)
Heights – why so important?
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NewReference FramesPlanned for 2022
• Replace NAD83 with a geocentric reference frame
• GNSS based• Replace NAVD88 with a
gravity based geoid
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GPS on BMWhy?
• NGS will use data collected to develop GEOID18, increase access to NAVD 88, and enable conversions to NAPGD2022
• Obtain ellipsoid height where we have an orthometric height
• Redundant measurements ensures reliability of measurement
• Many of these marks are already destroyed, finding them can be a challenge
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CrowdsourcingGPS on Bench Marks
• Help with final hybrid Geoid Model• Help with the transformation tools • Find Bench Marks
• Use our priority BM/tracking map• Use NGS Data Explorer• Use DS-World
• Provide a recovery note, coordinates, photos• Use DS-World
• Collect GPS data• 4 hours of data required with survey grade equipment• Share through OPUS
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OPUS Share Solution - April
https://geodesy.noaa.gov/sitemsgs/OPUS/shared/overview-2018-May.h
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Rocky Mountain Region WebinarsGPS on BM
• May 21 2:00 Basics, why, how, when– Recorded
• June 7 2:00 DS-World– Will be recorded
• June 14 2:00 Sharing through OPUS
https://attendee.gotowebinar.com/recording/4100208993309956616
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Thank you
NOAA’s National Geodetic Survey
240-988-6363
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Backup Slides
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Geodetic Control in
Carbon County
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Geodetic Control in the area
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Geodetic Control in the area
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NGS Data Sheet forV 75 in Saratoga, WY
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Priority BMs Identified
A PriorityB Priority
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Priority Stations near Saratoga, WY
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Crowdsourcing
• Find Bench Marks (priority and others)• Provide updated descriptions, Coordinates,
photos (use DS-World)• Collect 4 Hours of GPS grade data and create
an OPUS Data sheet (share through OPUS)
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Graph Courtesy of Dr. Daniel Gillins
Why do we need 4 hours of data?
1 sig
ma
NGS is working on OPUS for RTK that will accept 3 minute observations, however the accuracy will NOT be as good as 4 hour observations.
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NGS Training Material
NGS Video Library
NGS Online Lessons
GPS on Bench Marks Webpages
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OPUS Share Data Sheet
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DS-World
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DS-World
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geodesy.noaa.gov
NCATNGS Coordinate Conversion and Transformation Tool
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geod
esy.
noaa
.gov
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Thank you
NOAA’s National Geodetic Survey
240-988-6363