Zobrazeno 1 - 10
of 56
pro vyhledávání: '"Dru A. Smith"'
Publikováno v:
Marine Technology Society Journal. 49:151-158
The National Spatial Reference System (NSRS) is the official coordinate system for all geospatial activities performed by civilian federal agencies of the United States, including National Oceanic and Atmospheric Administration's navigational charts.
Publikováno v:
Journal of Geodetic Science, Vol 3, Iss 2, Pp 136-142 (2013)
The National Geodetic Survey (NGS) performed a few test flights using Micro-g’s Turnkey Airborne Gravity System (TAGS) at altitude of 1700, 6300 and 11000 meters over Alabama in 2008. The cross-track spacing was 10 km for the two lower flights and
Autor:
Dru A. Smith, Tomás Soler
Publikováno v:
Journal of Surveying Engineering. 136:120-125
This technical note introduces a rigorous calculation of “local accuracies.” The term local accuracies refers to the relative error between two arbitrary points (uncertainty of one point with respect to the other), expressed in a local horizon th
Autor:
Douglas S. Robertson, Pawel Wielgosz, Paul S. J. Spencer, Dru A. Smith, Israel Kashani, Dorota A. Grejner-Brzezinska, Gerald L. Mader
Publikováno v:
Journal of Surveying Engineering. 133:56-65
Fast and reliable ambiguity resolution (AR) is particularly challenging in long-range real-time kinematic (RTK) global positioning system (GPS), since the atmospheric errors decorrelate with the increasing base-rover separation, effectively reducing
Autor:
Pawel Wielgosz, Attila Komjathy, Dru A. Smith, Israel Kashani, Douglas S. Robertson, Gerald L. Mader, Dorota A. Grejner-Brzezinska
Publikováno v:
Navigation. 53:203-217
Reliable modeling of ionospheric delays is one of the most challenging aspects of network-based real-time kinematic GPS. Various ionospheric models derived from global, regional, and local permanently tracking networks have been developed to support
Publikováno v:
Journal of Surveying Engineering. 140
As part of the Geoid Slope Validation Survey of 2011 (GSVS11), the global positioning system (GPS) was used in a variety of ways to determine the geodetic coordinates of nearly 400 passive geodetic control marks. The Texas DOT (TXDOT) real-time netwo
Autor:
Pawel Wielgosz, Dru A. Smith, Douglas S. Robertson, Paul S. J. Spencer, Gerald L. Mader, Dorota A. Grejner-Brzezinska, Israel Kashani
Publikováno v:
Journal of Global Positioning Systems. 3:115-131
The primary objective of this paper is to test several methods of modeling the ionospheric corrections derived from a reference GPS network, and to study the impact of the models’ accuracy on the user positioning results. The five ionospheric model
Autor:
Dru A. Smith, Tomás Soler
Publikováno v:
Journal of Surveying Engineering. 138:48-50
Autor:
Dru A. Smith
Publikováno v:
Journal of Geodesy. 76:150-168
A new method for computing gravitational potential and attraction induced by distant, global masses on a global scale has been developed. The method uses series expansions and the well known one-dimensional fast Fourier transform (1-D FFT) method. It
Publikováno v:
Journal of Geodesy. 74:783-795
The gravitational attractions of terrestrial masses and condensed terrestrial masses were modeled in local regions of gravity stations in different ways. These differences in the models included the type of coordinate frame (Cartesian versus spherica