| Date | Presentation Name | HTML/PDF Slideshow | PPT Download | Audience | Location | Summary |
| February 20, 2009 |
Datums, Heights, and Geodesy |
PDF: 1 PDF: 2 PDF: 3 | PPT: 1 PPT: 2 PPT: 3 | ACSM Annual Meeting |
Salt Lake City, UT |
Work shop discussing the Beta USGG2009 (1st talk) and GEOID09 (2nd talk) models and a Summary (3rd talk) of remaining research requried to complete the final models. |
| February 24, 2007 |
Datums, Heights, and Geodesy |
PDF: A talk PDF: B talk PDF: C talk | PPT: A PPT: B PPT: C |
Annual Meeting of the Central Chapter of the PLSC |
Denver, CO |
Work shop discussing the relationship between datums, physical geodesy and heights. Designed to introduce the surveyor to fundamental geodetic relationships and future NGS activities designed to obtain a cm-level accurate geoid height model. |
| December 8-9, 2006 |
Improving Regional Geoid by optimal Combination of GRACE Gravity Model
and Surface Gravity Data |
PPT | GRACE User's Meeting |
San Francisco, CA |
New methods for combining elements of the gravity field are covered. |
|
| December 1, 2006 |
The NGS Gravity Program and Geoid Modeling |
PPT | PLSC Meeting |
Golden, CO |
Aspects of the geoid program relevant to Colorado surveyors. |
|
| November 15, 2006 |
Gravity, Geoid and Heights |
PPT | Texas Surveyor's Meeting |
Austin, TX |
Aspects of the geoid program relevant to Texas surveyors. |
|
| August 28 to September 1, 2006 |
Gravity-Lidar Study for 2006: Refined Gravity Field For the
North-Central Gulf of Mexico |
PPT | International Gravity Field Service Meeting |
Istanbul, Turkey |
Comparison of geoid models derived from aerogravity with rough lidar data & shorelines. |
|
| August 17, 2006 |
Geoid Height Models at NGS |
PPT | NGS Brown Bag Seminar |
Silver Spring, MD |
Update to NGS employees on geoid modeling efforts. |
|
| May 23-26, 2006 |
Preliminary Results of Evaluation of the INTERMAP's Airborne Gravity Data |
PPT | AGU Joint Assembly |
Baltimore, MD |
Reduction of GPS/INS data to rpoduce gravity profiles for comparison to upward
continued surface data. |
|
| May 23-26, 2006 |
Gravity Lidar Study for 2006: Analysis of EGM's |
PPT | AGU Joint Assembly |
Baltimore, MD |
A discussion of the present status of reducing aerogravity and lidar data collected in
the Winter of 2006 over the northern Gulf Coast states. |
|
| May 15-17, 2006 |
Gravity Lidar Study for 2006: A First Look |
PPT | CGU Annual Meeting |
Banff, Alberta, Canada |
A discussion of the aerogravity and lidar data collected in
the Winter of 2006 over the northern Gulf Coast states. |
|
| October 24-28, 2005 |
"Status and Future of the Geoid at
NGS" |
HTML | PPT | NGS Convocation |
Silver Spring, MD |
Shift towards dynamic datums and aerogravity
collection effort |
| October 12-13, 2005 |
"Status
and Plans of the National Geodetic Survey's Gravity Database Update" |
HTML | PPT | GRACE Scientific Meeting |
Austin, Texas |
Newer EGM's from GRACE data |
| August 22-26, 2005 |
"Evaluation of the NAVD 88 Using
Aerogravity and Lidar Data in the Gulf of Mexico" |
HTML | PPT | IAG Scientific Assembly |
Cairns, Australia |
Preliminary results from GLS05 survey of Gulf of
Mexico/southwestern Florida |
| May 23-27, 2005 |
Korean NGII |
Seoul, Korea |
CORS/leveling/geoid updates to Korean datums |
|||
| May 8-11, 2005 |
CGU Annual Meeting |
Banff, Canada |
Update to Canadians on North American Geoid progress |
|||
| February 28 - March 4, 2005 |
"Gravity, Geoids, and Other Vertical Datums
in the Puerto Rico/Virgin Islands Region"
|
HTML | PPT | Puerto Rico Surveyors and AVI Lt
Governor's staff |
San Juan, PR and St. Thomas, VI |
Prospects for improved Vertical
datum models |
| August 30 - September 3, 2004 |
"Regional Geoid
Improvements From Offshore Aerogravity Profiles" |
HTML | PPT | GGSM2004 |
Porto, Portugal |
Proposed Bay of Maine aerogravity/lidar study |
| July 5-9,
2004 |
"Validation of Gravity Models from CHAMP/GRACE Gravity Missions Using the GPS/leveling Data from the Continental US" | HTML | PPT | CHAMP/GRACE Scientists | Potsdam,
Germany |
Analysis of the GEOID03 model. |
| May 17-21,
2004 |
"Effect of High Resolution Altimetric Gravity Anomalies on the North America Geoid Computations" | HTML | PPT | AGU Session | Montreal,
CA |
Analysis of the GEOID03 model. |
| April 19,
2004 |
"Assessment of the New National Geoid Height Model, GEOID03" | HTML | PPT | ACSM Session | Nashville,
TN |
Analysis of the GEOID03 model. |
| January 14,
2004 |
"USGG2003 & GEOID03:Northeast States Geodetic Conference " | HTML | PPT | NE State Advisers | Concord,
NH |
Initial presentation of GEOID03 model focused on NE States. |
| October 25,
2001 |
"Gravity and Height Issues Related to the CERP" | HTML | PPT | CERP 2001 | West Palm Beach,
FL |
Discussion of available NGS gravity data in CERP area and its impact on orthometric height determination. |
| May 15,
2001 |
"Improved Covariance Modeling of Gravimetric, GPS, and Leveling Data in High-Resolution Hybrid Geoids" | HTML | PPT | CGU 2001 | Ottawa,
CAN |
Presentation of final results of hybrid geoid analysis. |
| January 16,
2001 |
"Improved Hybrid Geoid Modeling and the FY 2000 Geoid Models" | HTML | PPT | Brown Bag for Charlie Schwarz
and others |
Silver Spring,
MD |
An overview of research conducted on refining the least squares collocation techniques used to create hybrid geoids at NGS. |
| November 13, 2000 | "Geoid Modeling at NOAA" | HTML | PPT | Scott Gudes | Silver Spring, MD | An overview of the geoid program at NOAA covering definitions, financial impacts of a geoid model, NOAA resources and partnerships, basic geoid theory, and future directions. |
| August, 4 2000 | "Recent Investigations Towards Achieving a One Centimeter Geoid" | HTML | PPT | GGG2000 (IAG Symposium) | Banff, Alberta, Canada | Presentation covering areas of research related to the improvement of hybrid models and Helmertization of surface anomalies to generate improved future geoid models. |
| June 2, 2000 | "Use of G99SSS to evaluate the static gravity geopotential derived from the GRACE, CHAMP, and GOCE missions" | HTML | PPT | 2000 AGU Spring Meeting | Washington, DC | Discussion of available data sets for analysis of
spherical
harmonic models from impending satellite missions, followed by a brief
summary of the potential that these models hold for refining the geoid
determination process. |
| May 26, 2000 | "Recent Geoid Research at NGS" | HTML | PPT | 2000 Canadian Geoid Meeting | Banff, Alberta, Canada | A look at the latest theory and numerical results being investigated for high resolution geoid modeling at NGS. |
| May 25, 2000 | "Comparing GEOID99 to the GSD95 Canadian geoid model" | HTML | PPT | 2000 Canadian Geophysical Union Meeting | Banff, Alberta, Canada | A general comparison between the latest official models of the USA and Canada and how they compare at the border. |
| April 11, 2000 | "Gravity and the Geoid at NGS" | HTML | PPT | 2000 Geodetic Advisor Convocation | Silver Spring, MD | An overview of how a geoid is computed, the data
that is
needed, a brief look at GEOID99 and a discussion of GPS-derived
orthometric
heights. |
| December 10, 1998 | "Implications of Spherical Earth Models for Gravity Reduction Procedures and Geoid Computations" | HTML | N/A | 1998 AGU Autumn Meeting | San Francisco, CA | Using spherical models to prove consistency in
terrain
reduction techniques. Shows a link between terrain reduction and
downward
continuation. Cartesian coordinates cause most of the problems in
terrain
reductions. |
| May 27, 1997 | "The Impact of the Permanent Tide on GEOID96, G96SSS and NAVD 88" | HTML | PPT | 1997 AGU Spring Meeting | Baltimore, MD | An overview of the three major Permanent Tide systems, and how they affect the geoid models, GPS processing, and levelled heights in the United States. |
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