The accuracy of airborne LiDAR has been a topic of research for many years, but there remains a n... more The accuracy of airborne LiDAR has been a topic of research for many years, but there remains a need for a robust and reliable calibration technique. The accuracy of LiDAR points depends on various factors including GPS/IMU position and orientation, laser range, and scan angle measurements. As a result, the adjacent overlapping swaths, or flight strips, fail to match with each other. Surface matching is a procedure used to relatively register the LiDAR data and reduce the mismatch between the overlapping strips. However, in the presence of systematic errors and varying flight dynamics classical registration algorithms render poor results. Two types of algorithm are currently used for this purpose. One requires the presence of geometric features and the other utilizes the conventional surface matching techniques. The techniques based on geometric feature matching usually fail to render results in non-urban areas. On the other hand, the surface matching algorithms (that do not require...
2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2016
We propose combining a forward model based support vector regression and the semianalytical radia... more We propose combining a forward model based support vector regression and the semianalytical radiative transfer model to determine shallow water characteristics. The derived water depths were compared to both LiDAR derived water depths and field measured water depths. The bathymetry results show that both LiDAR and hyperspectral imagery are unable to retrieve water depth for deeper water (>7 m) due to the water attenuation. Fusion was also performed with the LiDAR bathymetry as a constraint on the hyperspectral imagery; the constraint varies the estimated water characteristics but we were not able to independently assess the performance because no measurements of water column characteristics were available. The retrieved hyperspectral bathymetry yielded a standard deviation of 20 cm when compared to LiDAR bathymetry.
... Rise in sea level From a geological point of view, perhaps the most important change will be ... more ... Rise in sea level From a geological point of view, perhaps the most important change will be the rise in sea level that accompanies the warming trend. ... (a) An aban-doned house, from just north of San Simeon in California, in the process of being undercut by the sea. ...
Title: Latitude : how American astronomers solved the mystery of variation. Authors: Carter, Bill... more Title: Latitude : how American astronomers solved the mystery of variation. Authors: Carter, Bill;Carter, Merri Sue. Publication: Latitude : how American astronomers solved the mystery of variation / Bill Carter and Merri Sue Carter. Annapolis, Md.: Naval Institute Press, 2002. ...
A new radio-telescope observatory located at Richmond, Fla. (near Miami), made its first successf... more A new radio-telescope observatory located at Richmond, Fla. (near Miami), made its first successful Very Long Baseline Interferometry (VLBI) observations on December 9, 1983, according to the National Geodetic Survey (NGS). This test session was followed on December 21 by the first operational observing session of the full, three-station POLARIS (Polar Motion Analysis by Radio Interferometric Surveying) network (the Richmond facility plus observatories near Boston, Mass., and El Paso, Tex.).The POLARIS network was joined in the historic, December 21 observing session by VLBI observatories in Onsala, Sweden, and Wettzell, Federal Republic of Germany. Only 8 hours of operations yielded sufficient data to determine the location of the Richmond site relative to the other four North American and European observatories to within a fraction of a meter. Refinements will quickly reduce uncertainties to a few centimeters.
Geodynamics can be defined as the study of the motions of Earth with respect to its own center of... more Geodynamics can be defined as the study of the motions of Earth with respect to its own center of mass and three locally-inertial directions. These motions include rotations of the whole Earth, as well as episodic, cyclic and secular deformations of the crust, and internal fluid circulations. Geodynamics is still largely an observational science, since there is yet no satisfactory theory to account for several of the most interesting of these motions. The observational aspects of geodynamics are basically astronomical, since the most obvious effects of terrestrial rotation and deformation (excepting of course occasional cataclysmic deformations) are seen as variations in the apparent positions of celestial bodies, as observed from the surface of the mobile, non-rigid Earth.
This paper summarizes results from the project POLar-motion Analysis by Radio Interferometric Sur... more This paper summarizes results from the project POLar-motion Analysis by Radio Interferometric Surveying (POLARIS), initiated in 1977. The primary goal of POLARIS was the development of an advanced polar motion and Earth rotation (UT1) monitoring service, capable of determining both the x and y components of polar motion to ±3 mas and UT1 to 0.1 ms, in observing periods of
ABSTRACT The National Science Foundation (NSF) recently awarded a grant to create a research cent... more ABSTRACT The National Science Foundation (NSF) recently awarded a grant to create a research center to support the use of airborne laser mapping technology in the scientific community. The NSF supported Center for Airborne Laser Mapping (NCALM) will be operated jointly by the Department of Civil & Coastal Engineering, College of Engineering, University of Florida (UF) and the Department of Earth and Planetary Science, University of California-Berkeley (UCB). NCALM will use the Airborne Laser Swath Mapping (ALSM) system jointly owned by UF and Florida International University (FIU), based at the UF Geosensing Engineering and Mapping (GEM) Research Center. The state-of-the-art laser surveying instrumentation, GPS systems, which are installed in a Cessna 337 Skymaster aircraft, will collect research grade data in areas selected through the competitive NSF grant review process. The ALSM observations will be analyzed both at UF and UCB, and made available to the PI through an archiving and distribution center at UCB-building upon the Berkeley Seismological Laboratory (BSL) Northern California Earthquake Data Center system. The purpose of NCALM is to provide research grade data from ALSM technology to NSF supported research studies in geosciences. The Center will also contribute to software development that will increase the processing speed and data accuracy. This presentation will discuss NCALM operation and the process of submitting proposals to NSF. In addition, it will outline the process to request available NCALM seed project funds to help jump-start small scientific research studies. Funds are also available for travel by academic researchers and students for hands-on knowledge and experience in ALSM technology at UF and UCB.
The accuracy of airborne LiDAR has been a topic of research for many years, but there remains a n... more The accuracy of airborne LiDAR has been a topic of research for many years, but there remains a need for a robust and reliable calibration technique. The accuracy of LiDAR points depends on various factors including GPS/IMU position and orientation, laser range, and scan angle measurements. As a result, the adjacent overlapping swaths, or flight strips, fail to match with each other. Surface matching is a procedure used to relatively register the LiDAR data and reduce the mismatch between the overlapping strips. However, in the presence of systematic errors and varying flight dynamics classical registration algorithms render poor results. Two types of algorithm are currently used for this purpose. One requires the presence of geometric features and the other utilizes the conventional surface matching techniques. The techniques based on geometric feature matching usually fail to render results in non-urban areas. On the other hand, the surface matching algorithms (that do not require...
2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2016
We propose combining a forward model based support vector regression and the semianalytical radia... more We propose combining a forward model based support vector regression and the semianalytical radiative transfer model to determine shallow water characteristics. The derived water depths were compared to both LiDAR derived water depths and field measured water depths. The bathymetry results show that both LiDAR and hyperspectral imagery are unable to retrieve water depth for deeper water (>7 m) due to the water attenuation. Fusion was also performed with the LiDAR bathymetry as a constraint on the hyperspectral imagery; the constraint varies the estimated water characteristics but we were not able to independently assess the performance because no measurements of water column characteristics were available. The retrieved hyperspectral bathymetry yielded a standard deviation of 20 cm when compared to LiDAR bathymetry.
... Rise in sea level From a geological point of view, perhaps the most important change will be ... more ... Rise in sea level From a geological point of view, perhaps the most important change will be the rise in sea level that accompanies the warming trend. ... (a) An aban-doned house, from just north of San Simeon in California, in the process of being undercut by the sea. ...
Title: Latitude : how American astronomers solved the mystery of variation. Authors: Carter, Bill... more Title: Latitude : how American astronomers solved the mystery of variation. Authors: Carter, Bill;Carter, Merri Sue. Publication: Latitude : how American astronomers solved the mystery of variation / Bill Carter and Merri Sue Carter. Annapolis, Md.: Naval Institute Press, 2002. ...
A new radio-telescope observatory located at Richmond, Fla. (near Miami), made its first successf... more A new radio-telescope observatory located at Richmond, Fla. (near Miami), made its first successful Very Long Baseline Interferometry (VLBI) observations on December 9, 1983, according to the National Geodetic Survey (NGS). This test session was followed on December 21 by the first operational observing session of the full, three-station POLARIS (Polar Motion Analysis by Radio Interferometric Surveying) network (the Richmond facility plus observatories near Boston, Mass., and El Paso, Tex.).The POLARIS network was joined in the historic, December 21 observing session by VLBI observatories in Onsala, Sweden, and Wettzell, Federal Republic of Germany. Only 8 hours of operations yielded sufficient data to determine the location of the Richmond site relative to the other four North American and European observatories to within a fraction of a meter. Refinements will quickly reduce uncertainties to a few centimeters.
Geodynamics can be defined as the study of the motions of Earth with respect to its own center of... more Geodynamics can be defined as the study of the motions of Earth with respect to its own center of mass and three locally-inertial directions. These motions include rotations of the whole Earth, as well as episodic, cyclic and secular deformations of the crust, and internal fluid circulations. Geodynamics is still largely an observational science, since there is yet no satisfactory theory to account for several of the most interesting of these motions. The observational aspects of geodynamics are basically astronomical, since the most obvious effects of terrestrial rotation and deformation (excepting of course occasional cataclysmic deformations) are seen as variations in the apparent positions of celestial bodies, as observed from the surface of the mobile, non-rigid Earth.
This paper summarizes results from the project POLar-motion Analysis by Radio Interferometric Sur... more This paper summarizes results from the project POLar-motion Analysis by Radio Interferometric Surveying (POLARIS), initiated in 1977. The primary goal of POLARIS was the development of an advanced polar motion and Earth rotation (UT1) monitoring service, capable of determining both the x and y components of polar motion to ±3 mas and UT1 to 0.1 ms, in observing periods of
ABSTRACT The National Science Foundation (NSF) recently awarded a grant to create a research cent... more ABSTRACT The National Science Foundation (NSF) recently awarded a grant to create a research center to support the use of airborne laser mapping technology in the scientific community. The NSF supported Center for Airborne Laser Mapping (NCALM) will be operated jointly by the Department of Civil & Coastal Engineering, College of Engineering, University of Florida (UF) and the Department of Earth and Planetary Science, University of California-Berkeley (UCB). NCALM will use the Airborne Laser Swath Mapping (ALSM) system jointly owned by UF and Florida International University (FIU), based at the UF Geosensing Engineering and Mapping (GEM) Research Center. The state-of-the-art laser surveying instrumentation, GPS systems, which are installed in a Cessna 337 Skymaster aircraft, will collect research grade data in areas selected through the competitive NSF grant review process. The ALSM observations will be analyzed both at UF and UCB, and made available to the PI through an archiving and distribution center at UCB-building upon the Berkeley Seismological Laboratory (BSL) Northern California Earthquake Data Center system. The purpose of NCALM is to provide research grade data from ALSM technology to NSF supported research studies in geosciences. The Center will also contribute to software development that will increase the processing speed and data accuracy. This presentation will discuss NCALM operation and the process of submitting proposals to NSF. In addition, it will outline the process to request available NCALM seed project funds to help jump-start small scientific research studies. Funds are also available for travel by academic researchers and students for hands-on knowledge and experience in ALSM technology at UF and UCB.
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