45 th Annual Alaska Surveying & Mapping Conference February 21-25, 2011 Hilton Anchorage Hotel Impact of Airborne Gravity Surveys on Geoid Modeling in.

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Presentation transcript:

45 th Annual Alaska Surveying & Mapping Conference February 21-25, 2011 Hilton Anchorage Hotel Impact of Airborne Gravity Surveys on Geoid Modeling in Alaska Part II: GRAV-D Airborne Survey Update Daniel R. Roman and Vicki A. Childers

Survey Priority Order Alabama test region Puerto Rico/US Virgin Islands Gulf of Mexico (except Florida) Alaska Eastern US Seaboard (& FL)/Great Lakes Western US Seaboard Hawaii, Guam/CNMI, American Samoa Interior CONUS Aleutian Islands

GRAV-D Airborne Surveys Gulf of Mexico (AL08, LA08, LA09, TX09) Puerto Rico/US Virgin Islands 2009 (PV09) Alaska (AK08, AK09, AK10-01, AK10- 02, AK10-03) California 2011 (CA11-01) - 11 surveys, ~10% of total area flown 45th Annual Alaska Surveying & Mapping Conference February 21-25, 2011 Impact of Airborne Gravity Surveys on Geoid Modeling in Alaska Thursday,

Gulf of Mexico Surveys 45th Annual Alaska Surveying & Mapping Conference February 21-25, 2011 Impact of Airborne Gravity Surveys on Geoid Modeling in Alaska Thursday,

Gulf of Mexico Preliminary Gravity 45th Annual Alaska Surveying & Mapping Conference February 21-25, 2011 Impact of Airborne Gravity Surveys on Geoid Modeling in Alaska Thursday,

Puerto Rico/US Virgin Islands 45th Annual Alaska Surveying & Mapping Conference February 21-25, 2011 Impact of Airborne Gravity Surveys on Geoid Modeling in Alaska Thursday,

Preliminary Gravity Puerto Rico 45th Annual Alaska Surveying & Mapping Conference February 21-25, 2011 Impact of Airborne Gravity Surveys on Geoid Modeling in Alaska Thursday,

California th Annual Alaska Surveying & Mapping Conference February 21-25, 2011 Impact of Airborne Gravity Surveys on Geoid Modeling in Alaska Thursday,

California 45th Annual Alaska Surveying & Mapping Conference February 21-25, 2011 Impact of Airborne Gravity Surveys on Geoid Modeling in Alaska Thursday,

Alaska Surveys 45th Annual Alaska Surveying & Mapping Conference February 21-25, 2011 Impact of Airborne Gravity Surveys on Geoid Modeling in Alaska Thursday, & Plan Fairbanks Anchorage

45th Annual Alaska Surveying & Mapping Conference February 21-25, 2011 Impact of Airborne Gravity Surveys on Geoid Modeling in Alaska Thursday, AK Preliminary Gravity

Basic Airborne Operations Instrumentation: – Relative gravity meter aboard aircraft – Inertial measurement unit – GNSS receivers included in both instruments – GPS base stations (three for redundancy) Gravity tie – New absolute measurement – Relative tie to meter height in plane 45th Annual Alaska Surveying & Mapping Conference February 21-25, 2011 Impact of Airborne Gravity Surveys on Geoid Modeling in Alaska Thursday,

GRAV-D Team Vicki Childers Theresa Diehl Sandy Preaux Justin Dahlberg Greg Watson Tim Wilkins Carly Weil (not pictured) Also pictured NOAA pilots Scott Price and Mark Sweeney 2010 NGS Convocation13

Field Capability Developing the project from scratch Instrumentation – Acquisition, engineering, installation, troubleshoot Operating procedures Data Handling – QC: equipment working, data quality sufficient – Metadata creation, data archival, shipment to HQ 14

Field Capacity: Challenges Field team depth Need a dedicated aircraft – Present NOAA capacity is limited – Need both a long- and a shorter-range aircraft – Mods for USGS magnetometer Needed instrumentation – Inertial measurement unit – Electronics racks

Data Processing: Software Development GPS processing – GrafNav – Kinematic GPS Challenge Gravity data processing – Aerograv Problem – Newton software – Programmer has created user-friendly version for 2.0 Newton 2.0

Airborne Data Flow

GRAV-D Web Page Program events are recorded here Survey progress will be displayed Plan to make data and software available here 18 /grav-d

Project Challenges Optimum survey heights: 5Kft, 20kft, 35kft? – Alabama AL08 tested flights at all three altitudes – Downward continued noise amplified 7 times in 35kft data, 2 times in 20kft data – Comparisons of gravity field recovery with EGM08 continued to h=0 shows poor results at 35kft 20,000 ft was identified as best height – Still above most weather – Aliasing issues can be dealt with

Newton 1.0 Residuals Δg: +NGS ‘A-EGMs’ (N=1080) vs. Terr. (h=0m) 35,000 ft 20,000 ft 5,000 ft

Improvements to GPS Processing? GPS Challenge produced 15 solutions from 9 groups We will look to use the software that yields the best results GrafNav will continue to be field QC software 45th Annual Alaska Surveying & Mapping Conference February 21-25, 2011 Impact of Airborne Gravity Surveys on Geoid Modeling in Alaska Thursday,

Improvements to Gravity Processing Thorough analysis of all aspects of gravity data processing Rigorous treatment of all corrections Final challenges remain: – Off-level correction – Low-pass filtering 45th Annual Alaska Surveying & Mapping Conference February 21-25, 2011 Impact of Airborne Gravity Surveys on Geoid Modeling in Alaska Thursday,

Early Version Data Residuals with AGM08 45th Annual Alaska Surveying & Mapping Conference February 21-25, 2011 Impact of Airborne Gravity Surveys on Geoid Modeling in Alaska Thursday,

AK08 Residual Gravity Profiles 45th Annual Alaska Surveying & Mapping Conference February 21-25, 2011 Impact of Airborne Gravity Surveys on Geoid Modeling in Alaska Thursday, As compared with Min = Max = Mean = 1.52 SD = 4.42 Original

Early Version Crossover Errors 45th Annual Alaska Surveying & Mapping Conference February 21-25, 2011 Impact of Airborne Gravity Surveys on Geoid Modeling in Alaska Thursday,

Crossover Plots for AK08 45th Annual Alaska Surveying & Mapping Conference February 21-25, 2011 Impact of Airborne Gravity Surveys on Geoid Modeling in Alaska Thursday, As compared with Min = Max = Mean = SD = 4.29 mGal Original

AK08 Residual Gravity Profiles 45th Annual Alaska Surveying & Mapping Conference February 21-25, 2011 Impact of Airborne Gravity Surveys on Geoid Modeling in Alaska Thursday, Lines (Airborne – EGM08)

AK08 vs EGM08 45th Annual Alaska Surveying & Mapping Conference February 21-25, 2011 Impact of Airborne Gravity Surveys on Geoid Modeling in Alaska Thursday, EGM08AK08

Break time! Next up: Geoid Modeling 45th Annual Alaska Surveying & Mapping Conference February 21-25, 2011 Impact of Airborne Gravity Surveys on Geoid Modeling in Alaska Thursday,