Precise Digital Leveling Section 6 Vertical Datum.

Slides:



Advertisements
Similar presentations
WA 2.ID 3.MT 4.OR 5.CA 6.NV 7.UT 8.WY 9.CO 10.AZ 11.NM 12.AK 13.HI 13 The West`
Advertisements

Tidal and Geodetic Vertical Datums State Geodetic Advisor, NGS National Ocean Service, NOAA Sacramento, CA October, 2005 Workshop.
Tidal Datums Text and Figures Source: NOAA/NOS CO-OPS Tidal Datums related publications.
Coastal Zone 2011 Conference “Cool Geodetic Resources For Your Project” A National Ocean Service, NOAA, Presentation 1)TOOLS TO OBTAIN GEODETIC CONTROL.
Tidal Datums, NAVD 88, and Coastal Commission Regs Curt Burfield, PLS Chief of Survey Standards Caltrans.
Datums, Heights and Geodesy Central Chapter of the Professional Land Surveyors of Colorado 2007 Annual Meeting Daniel R. Roman National Geodetic Survey.
and IGLD 85 Hydraulic Correctors
VDATUM: the Vertical Datum Transformation Tool
Lecture 18: Vertical Datums and a little Linear Regression GISC March 2009 For Geoid96.
GPS Heights Primer Chris Pearson 1 1 National Geodetic Survey 2300 South Dirksen Pkwy Springfield IL.
NOAA’s CENTER for OPERATIONAL OCEANOGRAPHIC PRODUCTS and SERVICES TIDAL DATUM COMPUTATION OVERVIEW.
Background Information on the Newspoets Total Number: 78 active newspoets. 26 (of the original 36) newspoets from returned this year.
MISSISSIPPI HEIGHT MODERNIZATION PROJECT JUNE 11, 2009 By Ronnie L. Taylor Chief, Geodetic Advisor Branch NOAA, National Geodetic Survey.
NICS Index State Participation As of 12/31/2007 DC NE NY WI IN NH MD CA NV IL OR TN PA CT ID MT WY ND SD NM KS TX AR OK MN OH WV MSAL KY SC MO ME MA DE.
Datums Computation Overview Center for Operational Oceanographic Products and Services January 8, 2009.
The Delta Levees Program
VERTICAL DATUMS APRIL 08, 2008 By Ronnie L. Taylor Chief, Geodetic Advisor Branch NOAA, National Geodetic Survey.
Agencies’ Participation in PBMS January 20, 2015 PA IL TX AZ CA Trained, Partial Data Entry (17) Required Characteristics & 75% of Key Indicators (8) OH.
House price index for AK
Vertical Control Introductions Purpose for presentation
Medicaid Income Eligibility Levels for Other Adults, January 2017
Train-the-Trainer Sessions 384 sessions with 11,279 participants
Avaya Consultant Relations Program
Comprehensive Medicaid Managed Care Models in the States, 2014
Train-the-Trainer Sessions 386 sessions with 11,336 participants
Non-Citizen Population, by State, 2011
Share of Women Ages 18 – 64 Who Are Uninsured, by State,
WY WI WV WA VA VT UT TX TN1 SD SC RI PA1 OR OK OH ND NC NY NM NJ NH2
WY WI WV WA VA VT UT TX TN1 SD SC RI PA OR OK OH1 ND NC NY NM NJ NH NV
Mobility Update and Discussion as of March 25, 2008
Current Status of the Medicaid Expansion Decision, as of May 30, 2013
IAH CONVERSION: ELIGIBLE BENEFICIARIES BY STATE
WAHBE Brokers / QHPs across the country as of
619 Involvement in State SSIPs
Train-the-Trainer Sessions 362 sessions with 10,873 participants
State Health Insurance Marketplace Types, 2015
State Health Insurance Marketplace Types, 2018
HHGM CASE WEIGHTS Early/Late Mix (Weighted Average)
Train-the-Trainer Sessions 386 sessions with 11,336 participants
Train-the-Trainer Sessions 394 sessions with 11,460 participants
Train-the-Trainer Sessions 392 sessions with 11,432 participants
Status of State Medicaid Expansion Decisions
Lecture 17: Geodetic Datums and a little Linear Regression
Sampling Distribution of a Sample Mean
Medicaid Income Eligibility Levels for Parents, January 2017
State Health Insurance Marketplace Types, 2017
S Co-Sponsors by State – May 23, 2014
Seventeen States Had Higher Uninsured Rates Than the National Average in 2013; Of Those, 11 Have Yet to Expand Eligibility for Medicaid AK NH WA VT ME.
Employer Premiums as Percentage of Median Household Income for Under-65 Population, 2003 and percent of under-65 population live where premiums.
Train-the-Trainer Sessions 396 sessions with 11,504 participants
Employer Premiums as Percentage of Median Household Income for Under-65 Population, 2003 and percent of under-65 population live where premiums.
Average annual growth rate
Sampling Distribution of a Sample Mean
Percent of Children Ages 0–17 Uninsured by State
Train-the-Trainer Sessions 402 sessions with 11,649 participants
How State Policies Limiting Abortion Coverage Changed Over Time
United States: age distribution family households and family size
Status of State Medicaid Expansion Decisions
Train-the-Trainer Sessions 402 sessions with 11,649 participants
Employer Premiums as Percentage of Median Household Income for Under-65 Population, 2003 and percent of under-65 population live where premiums.
Percent of Adults Ages 18–64 Uninsured by State
Train-the-Trainer Sessions 401 sessions with 11,639 participants
Status of State Medicaid Expansion Decisions
Train-the-Trainer Sessions 416 sessions with 11,878 participants
Current Status of State Individual Marketplace and Medicaid Expansion Decisions, as of September 30, 2013 WY WI WV WA VA VT UT TX TN SD SC RI PA OR OK.
Status of State Medicaid Expansion Decisions
Income Eligibility Levels for Children in Medicaid/CHIP, January 2017
WY WI WV WA VA VT UT TX TN SD SC RI PA OR OK OH ND NC NY NM NJ NH NV
Train-the-Trainer Sessions 429 sessions with 12,141 participants
Train-the-Trainer Sessions 436 sessions with 12,254 participants
Presentation transcript:

Precise Digital Leveling Section 6 Vertical Datum

Local/Regional – Assumed – City, County – International Great Lakes Datum 1955 (IGLD55) – International Great Lakes Datum 1985 (IGLD85) – Tidal Datums National – National Geodetic Vertical Datum of 1929 (NGVD29) – North American Vertical Datum of 1988 (NAVD88)

National Geodetic Vertical Datum 1929 (NGVD 29) Defined by heights of 26 tidal stations in U.S. and Canada Tide gages were connected to the network by leveling from tide gage staffs to bench marks Water-level transfers used to connect leveling across Great Lakes Normal Orthometric Heights: – H* = C /  – C = model (“normal”) geopotential number –  = from normal gravity formula H* = 0 level is NOT a level surface

First-Order Leveling Network NGVD 29

North American Vertical Datum 1988 (NAVD 88) Defined by one height (Father Point/Rimouski) Water-level transfers connect leveling across Great Lakes Adjustment performed in Geopotential Numbers Helmert Orthometric Heights: – H = C / (g H 0 ) – C = geopotential number – g = surface gravity measurement (mgals) – H 0 = approximate orthometric height (km) H = 0 level is nearly a level surface H = 0 level is biased relative to global mean sea level

Vertical Control Network NAVD 88

NGVD 29 Versus NAVD 88 Datum Considerations: NGVD 29 NAVD 88 Defining Height(s) 26 Local MSL 1 Local MSL Tidal Epoch Various (18.6 years) Treatment of Leveling Data: Gravity Correction Ortho Correction Geopotential Nos. (normal gravity) (observed gravity) Other Corrections Level, Rod, Temp. Level, Rod, Astro, Temp, Magnetic, and Refraction Adjustments Considerations: Method Least-squares Least-squares Technique Condition Eq. Observation Eq. Units of Measure Meters Geopotential Units Observation Type Links Between Height Differences Junction Points Between Adjacent BMs

NGVD 29 Versus NAVD 88 (continued) Adjustments Statistics : NGVD 29 NAVD 88 No. of Bench Marks 100,000 (est) 450,000 (US only) Km of Leveling Data 75,159 (US) 1,001,500 31,565 (Canada) Published Information: Orthometric Height TypeNormal Helmert Orthometric Height UnitsMeters Meters Gravity ValueNormal “Actual”

Tidal Datum Heights Measured Above Local Mean Sea Level National Tidal Datum epoch; 19 year series Encompasses all significant tidal periods including 18.6 year period for regression of Moon’s nodes Averages out nearly all meteorological, hydrological, and oceanographic variability Leveling is used to determine relationship between bench marks and tidal gauges

NAVD 88 minus LMSL ( ) (units = cm)

Point Reyes, Drakes Bay, CaliforniaFT

Geodetic and Tidal Geodetic and Tidal Datum Relationships

AL, AK, CA, CT, FL, GA, LA, MD, MS, NJ, NY, NC, OR, RI, SC, WA Privately Owned Uplands State Owned Tidelands Territorial Seas State Submerged Lands Contiguous Zone Exclusive Economic Zone Federal Submerged Lands High Seas Privately Owned State Owned TX 3 n. mi. 12 n. mi. 200 n. mi. Privately Owned State Owned DE, MA, ME, NH, PA, VA MHHW MHW MLLW Importance of Shoreline Chart Datum