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Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ
Achieving Great Heights: Toward a Better Vertical Reference System in Alaska
Michael Dennis, National Geodetic SurveyDavid B. Zilkoski, Geospatial Solutions by DBZ
March 28, 2014
Old Lines/New Datums48th Annual Alaska Surveying and Mapping Conference
Westmark Fairbanks Hotel and Conference CenterFairbanks, Alaska
Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ
Determining Reliable Orthometric Heights is Often Challenging But That Is Especially The Case In Alaska
Some of the Things That Make Alaska Such a Challenge Include:
• Sparseness and Age of the Geodetic Leveling Network
• Vertical Tectonic Movement
• Large Areas With No Road Access
• Lack of Terrestrial Gravity Data
• Poor Digital Models of Topography (Used for Gravitation Calculations)
Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ
Determining Reliable Orthometric Heights is Often Challenging But That Is Especially The Case In Alaska
• This Presentation Will Describe Some New and Future Developments Related to Height Determination in Alaska
• Condition of the existing NAVD 88 leveling network in Alaska
• The latest NGS scientific and hybrid geoid models (USGG2012 and GEOID12A)
• Bench marks used to develop GEOID12A
• Status of the Gravity for the Redefinition of the American Vertical Datum (GRAV-D) Project
• The new vertical datum planned for completion in 2022
• What is needed to meet future surveying and mapping requirements in Alaska
• Discuss How Alaskans Can Help NGS Make a Better, More Accurate Geoid Model
Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ
Determining Reliable Orthometric Heights is Often Challenging But That Is Especially The Case In Alaska
Condition of the existing NAVD 88 leveling network in Alaska
Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ
Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ
Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ
Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ
Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ
Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ
Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ
The latest NGS scientific and hybrid geoid models (USGG2012 and GEOID12A)
Determining Reliable Orthometric Heights is Often Challenging But That Is Especially The Case In Alaska
USGG2012 minus
GEOID12A (feet)
USGG2012 minus
GEOID12A (feet)
Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ
Above a LMSL Datum
Above a LMSL Datum
Analysis of GEOID12A
Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ
Analysis of GEOID12A
Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ
Rejected
Analysis of GEOID12A
Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ
Rejected
Analysis of GEOID12A
Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ
Analysis of GEOID12A
Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ
Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ
Total Post-1964 Postseismic Uplift
1964 to presentUnits: cm
Cohen and Freymueller (2004)
Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ
Status of the Gravity for the Redefinition of the American Vertical Datum (GRAV-D) Project
Determining Reliable Orthometric Heights is Often Challenging But That Is Especially The Case In Alaska
GRAV-D statusGRAV-D status
Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ
The new vertical datum planned for completion in 2022
Determining Reliable Orthometric Heights is Often Challenging But That Is Especially The Case In Alaska
NAD 83(2011) to NAD 83(2011) to IGS08 at epoch 2022.0IGS08 at epoch 2022.0
New vertical datum ortho height minus NAVD 88 (m)
Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ
New Leveling Observations
Better Knowledge of the Vertical Tectonic Movement
More Gravity Data
Better Digital Models of Topography
Determining Reliable Orthometric Heights is Often Challenging But That Is Especially The Case In Alaska
What is needed to meet future surveying and mapping requirements in Alaska
Prevent Earthquakes and Crustal Motion from
Occurring
Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ
Challenging But That Is Especially The Case In AlaskaDetermining Reliable Orthometric Heights is Often
How Alaskans can help NGS make a better, more accurate geoid model
Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ
• Obtain New Leveling Observations
• Obtain Better Knowledge of the Vertical Tectonic Movement
• Obtain More Gravity Data
• Obtain Better Digital Models of Topography
Challenging But That Is Especially The Case In AlaskaDetermining Reliable Orthometric Heights is Often
How Alaskans can help NGS make a better, more accurate geoid model
Educate Leaders and Visionaries about the Issues and Problems Associated
with Alaska’s Vertical Control Network
Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ
Challenging But That Is Especially The Case In Alaska
Determining Reliable Orthometric Heights is Often
• Provide New Leveling Data to NGS Using NGS Locus Tool
• Provide GPS Data on New Leveling Stations Using NGS OPUS-Projects Tool
How Alaskans can help NGS make a better, more accurate geoid model
Leveling Observations Along Entire Line
GPS Observations
GPS Observations
GPS Observations
GPS Observations
GPS Observations
Integrated and Collaborative Organizations Create Geospatial Solutions
Geospatial Solutions by DBZ