Gravity-Lidar Study for 2006: Refined Gravity Field For the North-Central Gulf of Mexico Dan Roman...
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Transcript of Gravity-Lidar Study for 2006: Refined Gravity Field For the North-Central Gulf of Mexico Dan Roman...
![Page 1: Gravity-Lidar Study for 2006: Refined Gravity Field For the North-Central Gulf of Mexico Dan Roman National Geodetic Survey Jarir Saleh National Geodetic.](https://reader035.fdocuments.us/reader035/viewer/2022070410/56649eca5503460f94bd8e57/html5/thumbnails/1.jpg)
Gravity-Lidar Study for 2006: Refined Gravity Field For the North-Central Gulf of Mexico
Dan RomanNational Geodetic Survey
Jarir SalehNational Geodetic Survey/Earth Resources Technology
![Page 2: Gravity-Lidar Study for 2006: Refined Gravity Field For the North-Central Gulf of Mexico Dan Roman National Geodetic Survey Jarir Saleh National Geodetic.](https://reader035.fdocuments.us/reader035/viewer/2022070410/56649eca5503460f94bd8e57/html5/thumbnails/2.jpg)
Colleagues
• National Geodetic Survey– Yan Ming Wang and Jarir Saleh
• Naval Research Laboratory– John Brozena and Vicki Childers
• NASA GSFC Laser Remote Sensing– David Rabine, Scott Luthcke, and Bryan Blair
• University of Maryland, College Park Campus– Sandy Martinka and Michelle Hofton
![Page 3: Gravity-Lidar Study for 2006: Refined Gravity Field For the North-Central Gulf of Mexico Dan Roman National Geodetic Survey Jarir Saleh National Geodetic.](https://reader035.fdocuments.us/reader035/viewer/2022070410/56649eca5503460f94bd8e57/html5/thumbnails/3.jpg)
Gravity Lidar Study for 2006 (GLS06)
• AOI: Northern Gulf of Mexico (FL-AL-MS shoreline)• Equipment: NRL’s LaCoste-Romberg Air-Sea II,
NASA’s LVIS, and NOAA Citation II• Flights at 10 km elevation and spacing• To ensure seamless and consistent coverage
across the sea-shore boundary• To reduce geoid uncertainties and better tie in to
MSL based on lidar observations• VDatum model area: tidal and dynamic
topography models currently available
![Page 4: Gravity-Lidar Study for 2006: Refined Gravity Field For the North-Central Gulf of Mexico Dan Roman National Geodetic Survey Jarir Saleh National Geodetic.](https://reader035.fdocuments.us/reader035/viewer/2022070410/56649eca5503460f94bd8e57/html5/thumbnails/4.jpg)
Extent of Gravity and Data Collection Flights
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Gravity Map Upward Continued to 10 km
![Page 6: Gravity-Lidar Study for 2006: Refined Gravity Field For the North-Central Gulf of Mexico Dan Roman National Geodetic Survey Jarir Saleh National Geodetic.](https://reader035.fdocuments.us/reader035/viewer/2022070410/56649eca5503460f94bd8e57/html5/thumbnails/6.jpg)
Filter Characteristics
• All corrections (GPS, off level, Eotvos, drift, etc) were applied to gravity data – otherwise: unfiltered
• Signal interpolated and provided by NRL• Some problems with initial filters • Settled on moving window filter modified by an elastic
string filter• Trade Off-Diagram:• Best choices
– 90s: first minima– 240s: lowest minima
RMS Crossovers vs Window Size
3
4
5
6
7
8
9
10
11
0 50 100 150 200 250 300 350 400 450
Filter Size / seconds
rms c
rosso
ver /
mGal
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Example Profile #1: Southernmost East-West Track
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Residual Gravity at 10.5 km with 91s Filter
![Page 9: Gravity-Lidar Study for 2006: Refined Gravity Field For the North-Central Gulf of Mexico Dan Roman National Geodetic Survey Jarir Saleh National Geodetic.](https://reader035.fdocuments.us/reader035/viewer/2022070410/56649eca5503460f94bd8e57/html5/thumbnails/9.jpg)
Equivalent Pseudo-Geoid Signal for 91s Filter
![Page 10: Gravity-Lidar Study for 2006: Refined Gravity Field For the North-Central Gulf of Mexico Dan Roman National Geodetic Survey Jarir Saleh National Geodetic.](https://reader035.fdocuments.us/reader035/viewer/2022070410/56649eca5503460f94bd8e57/html5/thumbnails/10.jpg)
Future Work• Apply filter during application of corrections (not after!)• Downward continue these data • Check against other surface data • Remove inconsistencies• create a geoid model and compare to previous models• Use new geoid model in conjunction with dynamic topography
model to compare with lidar observations (LVIS)• Establish absolute accuracy of gravimetric geoid in Vdatum
study area and at tidal bench marks• Compare GPS-leveling derived from gravimetric geoid to NAVD
88 heights at tidal bench marks• Compare gravimetric geoid to forthcoming EGM’s• Expand AOI further westward through Louisiana and Texas
![Page 11: Gravity-Lidar Study for 2006: Refined Gravity Field For the North-Central Gulf of Mexico Dan Roman National Geodetic Survey Jarir Saleh National Geodetic.](https://reader035.fdocuments.us/reader035/viewer/2022070410/56649eca5503460f94bd8e57/html5/thumbnails/11.jpg)
Intermap GPS/INS Coverage
Map courtesy of Intermap Technologies, Inc.
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Dynamic Topography Coverage
From Richard Patchen, NOAA/NOS/Coast Survey Development Laboratory
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QUESTIONS?
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Extra Slide: Residual Gravity at 10.5 km with 240s Filter
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Extra Slide: Equivalent Pseudo-Geoid Signal for 240s filter