| Evaluation of Ground Vibrations Induced by Military Noise Sources |
AUG 2006 |
73 pages |
| Authors:
Donald G. Albert; Patrice Boulanger; Keith Attenborough; Michael J. White; ENGINEERING RESEARCH AND DEVELOPMENT CENTER HANOVER NH COLD REGIONS RESEARCH AND ENGINEERING LAB
|
 | Measurements from locations with a variety of ground types were analyzed to determine the mechanisms and levels of the ground vibrations produced by airborne detonations of C4. The measurements show that an early seismic arrival from an underground path is always much smaller than the vibration induced by the air blast arrival. The acoustic-to-seismic coupling ratio for the atmospheric wave is a constant with respect to distance and peak pressure ... |
|
| Development of a Geospatial Data-Sharing Method for Unmanned Vehicles Based on the Joint Architecture for Unmanned Systems (JAUS) |
AUG 2005 |
133 pages |
| Authors:
III Evans Carl P.; FLORIDA UNIV GAINESVILLE CENTER FOR INTELLIGENT MACHINES AND ROBOTICS
|
| A task performed almost effortlessly by humans, perception is perhaps one of the most difficult tasks for autonomous vehicles. While substantial research has been done to develop these technologies, few studies have examined ways for multiple heterogeneous unmanned systems to cooperate in their perception tasks. Our study examined ways to model both perceived and a priori geospatial information, and formatting these data so that they can be used by the ... |
|
| Celestial Pole Offsets: Conversion from (dX,dY) to (dpsi,depsilon), Version 3 |
MAY 2005 |
5 pages |
| Authors:
George H. Kaplan; NAVAL OBSERVATORY WASHINGTON DC
|
| Resolutions B1.6?B1.8 of the 2000 IAU General Assembly established the IAU 2000A precession-nutation model, defined more precisely what is meant by the celestial pole, and provided a new definition of UT1 in terms of an angle, theta, that directly measures the rotation of Earth in the celestial reference system. These resolutions represent major changes in the way in which the instantaneous orientation of the Earth is to be computed. In ... |
|
| A Faster Technique for the Transformation of Universal Transverse Mercator Projected Raster Images into a Geodetic Projection |
11 MAR 2005 |
16 pages |
| Authors:
Hillary C. Mesick; Elias Z. Ioup; John T. Sample; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS MARINE GEOSCIENCES DIV
|
| Often it is necessary to transform a georeferenced raster image from one projection to another. This report describes an efficient method for performing Universal Transverse Mercator (UTM) to Geodetic projection transformations. The reprojected images are suitable for applications that require high accuracy and can be seamlessly combined with preexisting Geodetic data. The procedure can be abstracted to convert between any two projection types. |
|
| Distance Functions and Geodesics on Points Clouds |
2005 |
11 pages |
| Authors:
Facundo Memoli; Guillermo Sapiro; MINNESOTA UNIV MINNEAPOLIS DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| An algorithm for computing intrinsic distance functions and geodesics on sub-manifolds vector r(sup d) given by point clouds is introduced in this paper. The basic idea is that, as shown in this paper intrinsic distance functions and geodesics on general co-dimension sub-manifolds vector r(sup d) can be accurately approximated by the extrinsic Euclidean ones computed in a thin offset band surrounding the manifold. This permits the use of computationally optimal ... |
|
| A New Realization of Terrestrial Time |
SEP 2004 |
13 pages |
| Authors:
G. Petit; BUREAU INTERNATIONAL DES POIDS ET MESURES SEVRES (FRANCE)
|
| Terrestrial Time TT is a time coordinate in a geocentric reference system. It is realized through International Atomic Time TAI, which gets its stability from some 200 atomic clocks worldwide and its accuracy from a small number of primary frequency standards (PFSs), whose frequency measurements are used to steer the TAI frequency. Because TAI is computed in real time and has operational constraints, it does not provide an optimal realization ... |
|
| Fast All-Season Soil STrength (FASST) |
SEP 2004 |
107 pages |
| Authors:
Susan Frankenstein; George G. Koenig; ENGINEER RESEARCH AND DEVELOPMENT CENTER HANOVER NH COLD REGIONS RESEARCH AND ENGINEERING LAB
|
| The ability to predict the state of the ground is essential to manned and unmanned vehicle mobility and personnel movement, as well as determining sensor performance for both military and civilian activities. As part of the Army's Battlespace Terrain Reasoning and Awareness research program, the 1-D dynamic state of the ground model FASST (Fast All-season Soil STrength) was developed. It calculates the ground's moisture content, ice content, temperature, and freeze/thaw ... |
|
| A Low-Cost Mid-Wave IR Microsatellite Imager Concept Based on Uncooled Technology |
22 JUL 2004 |
10 pages |
| Authors:
Brian D. Oelrich; Arnaud Crastes; Craig I. Underwood; Stephen Mackin; SURREY UNIV GUILDFORD (UNITED KINGDOM)
|
| A new class of lowcost midwave infrared (MWIR) Earth observation (EO) data will become available with the flight of miniature MWIR EO instruments in satellite constellations. Due to the frequent ground repeat times inherent in constellations, this data set would provide a unique alternative for those wishing to analyse trends or rapidly detect anomalous changes in the MWIR characteristics of the earth's surface (e.g fire detection) or atmosphere. To date, ... |
|
| The NRL Mountain Wave Forecast Model (MWFM) [Preprint] |
17 JUN 2004 |
21 pages |
| Authors:
Stephen D. Eckermann; Jun Ma; Dave Broutman; NAVAL RESEARCH LAB WASHINGTON DC E O HULBURT CENTER FOR SPACE RESEARCH
|
| The Department of Defense has a large and increasing investment in high-altitude long-endurance (HALE) reconnaissance aircraft. HALE aircraft have lightweight broad-winged designs, enabling them to reach stratospheric altitudes. These properties make them both aerodynamically and structurally vulnerable to any severe turbulence they intercept at altitude. Since the stratosphere is very dry and thus has no in situ cloud-related sources of turbulence from severe weather, only clear-air turbulence (CAT) can occur. ... |
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| Task Switching With 2D and 3D Displays of Geographic Terrain: The Role of Visual Momentum |
APR 2004 |
|
| Authors:
Justin G. Hollands; Nada Ivanovic; DEFENCE RESEARCH AND DEVELOPMENT TORONTO (CANADA)
|
 | We were interested in determining if the visual momentum provided by gradual transition between 2D and 3D views of geographic terrain aided task switching. Forty-two participants made judgments about the properties of two points placed on terrain depicted as 2D or 3D displays. Participants performed the tasks in pairs of trials, switching tasks and displays between trials. On half the trials (continuous transition), the display dynamically rotated in depth from ... |
|
| IERS Conventions (2003) |
2004 |
128 pages |
| Authors:
Dennis D. McCarthy; Gerard Petit; INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS) (GERMANY)
|
| This document is intended to define the standard reference systems realized by the International Earth Rotation Service (IERS) and the models and procedures used for this purpose. It is a continuation of the series of documents begun with the Project MERIT Standards (Melbourne et al., 1983) and continued with the IERS Standards (McCarthy, 1989; McCarthy, 1992) and IERS conventions (McCarthy, 1996). The current issue of the IERS Conventions is called ... |
|
| Mapping Charting and Geodesy Branch. Abstracts of Publications 2000-2002 |
28 NOV 2003 |
208 pages |
| Authors:
Michael M. Harris; Dianne M. James; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
|
| This document contains abstracts from publications written by the Naval Research Laboratory's Mapping, Charting, and Geodesy (MC&G) Branch during the period 1 January 2000 to 31 December 2002. During that time period, the MC&G Branch published 11 chapters in books, 28 journal articles, and 26 NRL reports. The majority of the abstracts (83) are from conference proceedings. A video, 6 web pages, and 19 abstracts were also published. Abstracts from ... |
|
| Another Look at Non-Rotating Origins |
22 JUL 2003 |
5 pages |
| Authors:
George H. Kaplan; NAVAL OBSERVATORY WASHINGTON DC ASTRONOMICAL APPLICATIONS DEPT
|
| Two "non-rotating origins" were defined by the IAU in 2000 for the measurement of Earth rotation: the Celestial Ephemeris Origin (CEO) in the ICRS and the Terrestrial Ephemeris Origin (TEO) in the ITRS. Universal Time (UT1) is now defined by an expression based on the angle theta between the CEO and TEO. Many previous papers, e.g., Capitaine, Guinot, & McCarthy (2000), developed the position of the CEO in terms of ... |
|
| A Computationally Efficient Technique for the Improvement of the Display of Geospatial Information Stored in Geographic Coordinates |
11 JUL 2003 |
14 pages |
| Authors:
Hillary C. Mesick; Frank P. McCreedy; Michael M. Harris; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS MAPPING CHARTING AND GEODESY BRANCH
|
| Geographical Information Systems (GIS) frequently store positional information in geographic coordinates (i.e., degrees of latitude and longitude). As a result, when GIS data are displayed on a video terminal, it is a usual practice to display the information "un-projected" with the view window x and y axis scaled in decimal degrees with degrees of longitude and latitude having the same scale factor on each axis. While this practice results in ... |
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| Digital Mapping, Charting, and Geodesy Analysis Program (DMAP) Spatial and Temporal Reference Systems and the 4D3 Concept |
30 SEP 2002 |
|
| Authors:
illary Mesick; Susan Carter; Michael Harris; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS MARINE GEOSCIENCES DIV
|
| A technical review of the Spatial and Temporal Reference Systems and the 4D3 Concept was performed by the Digital Mapping, Charting, and Geodesy Analysis Program (DMAP). Background, discussion points, and conclusions are presented. |
|
| Assessment of Spatial Data Mining Tools for Integration into an Object- Oriented GIS (GIDB) |
28 FEB 2002 |
11 pages |
| Authors:
Roy Victor Ladner; Frederick Petry; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS MARINE GEOSCIENCES DIV
|
| A variety of data mining techniques are under evaluation on the spatial data of concern in our setting. We are planning to integrate a number of these techniques into our geospatial system (GIDB). Three approaches are under special consideration and are described in the paper. A COTS data mining system has been successfully used to develop predictive models of near-shore conditions such as wave height for naval amphibious operations. Attribute ... |
|
| Underground Structures and Gravity Gradiometry |
15 JAN 2002 |
67 pages |
| Authors:
M. W. Maier; AEROSPACE CORP EL SEGUNDO CA RECONNAISSANCE SYSTEMS DIV
|
| This report evaluates the use of gravity gradiometry as a tool to characterize underground facilities. The gradient of the Earth's gravitational field can be used to make inferences about the Earth's mass density field. Mass deficits, such as those produced when an underground region is excavated, produce a characteristic change in the Earth's gravitational field. In principle, gradiometric measurements can make inferences about mass deficits that are covered by hundreds ... |
|
| Accurate Multiresolution Modeling of the Earth's Gravitational Field |
SEP 2001 |
25 pages |
| Authors:
G. Beylkin; COLORADO UNIV AT BOULDER DEPT OF APPLIED MATHEMATICS
|
| The thrust of this project has been two-fold, namely, (1) to improve the performance of existing models of Earth's gravitational field, mainly with respect to speed of evaluation; and (2) to develop new multi resolution estimation techniques to produce new gravitational models. We have constructed two local models of the gravitational field, both of which map the surface of a sphere to the surface of a cube. These models differ ... |
|
| Progress in Carrier Phase Time Transfer |
14 MAY 2001 |
25 pages |
| Authors:
Jim Ray; Felicitas Arias; Gerard Petit; Tim Springer; Thomas Schildknecht; NAVAL OBSERVATORY WASHINGTON DC TIME SERVICE DIV
|
| The progress of the joint Pilot Project for time transfer, formed by the lnternational GPS Service (IGS) and the Bureau International des Poids et Mesures (BIPM), was recently reviewed. Three notable milestones were set. 1) The IGS will implement, at least in a test mode, an internally realized time scale based on an integration of combined frequency standards within the IGS network. This will eventually become the reference time scale ... |
|
| The Effect of Energy Deficit on Physical Performance at Sea Level and 4, 300 M Altitude |
MAY 2001 |
37 pages |
| Authors:
Charles S. Fulco; Anne Friedlander; Stephen R. Muza; Paul B. Rock; Scott Robinson; ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA
|
| We investigated the effect on physical performance of 3 weeks of severe deficit energy intake at sea level (SL) and high altitude (HA, 4300 m). Twenty-six young healthy men (range: 18 to 34 yrs) were assigned for 3 weeks to one of 3 dietary and environmental groups. One group consumed adequate kcal/day to maintain body weight while living at HA (ADQ, n = 7) and two groups consumed 1500 kcal/day ... |
|
| Evidence from Gravity Anomalies for Interactions of the Marion and Bouvet Hotspots with the Southwest Indian Ridge: Effects of Transform Offsets |
MAR 2001 |
|
| Authors:
Jennifer E. Georgen; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
|
| The ultra-slow spreading Southwest Indian Ridge (SWIR) presents a unique environment to study the interactions between hotspots and ridges with highly segmented geometry. Using recently available satellite free-air gravity and shipboard bathymetry data, we obtain mantle Bouguer (MBA) and residual mantle Bouguer anomalies (RMBA) by removing from free-air gravity the attractions of seafloor topography, sediment thickness variations, a reference crust, and theoretically-predicted effects of lithospheric cooling. The Bouvet hotspot, previously ... |
|
| Digital Mapping, Charting, and Geodesy Analysis Program: Technical Review DLA Electronic Catalog of NIMA Products Prototype 1 |
22 FEB 2001 |
36 pages |
| Authors:
Susan Carter; Hillary Mesick; John Breckenridge; Michael Trenchard; Kevin Shaw; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
|
| One of the functions of the Defense Logistics Agency (DLA) is to provide a supply channel for maps and charts to the DoD users. Currently the user is provided with a set of printed map index sheets that are used to obtain the appropriate product (i.e., stock) number when placing an order with DLA for maps. This set of index catalogs consist of: Part 1 - Aeronautical Products Catalog and ... |
|
| Examination of the Hipparcos Proper Motion System from Lunar Occultation Analysis |
MAR 2000 |
6 pages |
| Authors:
Mitsuru Soma; TOKYO ASTRONOMICAL OBSERVATORY MITAKA (JAPAN)
|
| Lunar occultations were analyzed to detect errors in the proper motion system of the Hipparcos frame. The analysis suggests much larger errors in the rotation of the Hipparcos reference frame than those explained by the Hipparcos team, which were determined from the direct comparison between the Hipparcos and FK5 catalogs. |
|
| Geodetic and Geophysical Applications of High Precision Astrometry |
MAR 2000 |
9 pages |
| Authors:
Clark R. Wilson; TEXAS UNIV AT AUSTIN CENTER FOR SPACE RESEARCH
|
| High-precision astrometry has a long history of making fundamental contributions to geodesy and geophysics extending centuries into the past, and has provided the foundation for many exciting developments in geophysics in the last several decades. In the 1970s, geodetic Very Long Baseline Interferometry (VLBI) and laser ranging provided the first direct measurement of plate tectonic deformation of the crust. These techniques also have revolutionized the study of Earth rotation by ... |
|
| On the Reference Pole for Earth Orientation and UT1 |
MAR 2000 |
8 pages |
| Authors:
P. M. Mathews; T. A. Herring; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF EARTH ATMOSPHERIC AND PLANETARYSCIENCES
|
| The authors show how the study of variations in orientation of a terrestrial reference system (TRS) in space may be done directly in terms of the motion of the pole of the TRS and rotation around it, and how a separation of these variations into low frequency and high frequency (retrograde and prograde diurnal, semidiurnal, etc.) bands enables one to characterize and model variations belonging to the various bands and ... |
|
| Influence of Adopted Nutation Model on VLBI NEOS-Intensives Analysis |
MAR 2000 |
5 pages |
| Authors:
Oleg Titov; SAINT PETERSBURG STATE UNIV (RUSSIA)
|
| Very Long Baseline Interferometry (VLBI) provides information about the Earth's rotation. Various observational programs have operated for different purposes since 1983. The purpose of the NEOS-Intensive program is to make observations of Universal Time (UT1-UTC). Short observational sessions (1-2 hours) include only the transcontinental baseline (Wettzell - NRAO20). Twenty to thirty individual scans are performed during the observational time. Only five parameters (i.e., wet delay for the reference station, wet ... |
|
| Report of the BIPM/IAU Joint Committee on Relativity for Space-Time Reference Systems and Metrology |
MAR 2000 |
9 pages |
| Authors:
G. Petit; BUREAU INTERNATIONAL DES POIDS ET MESURES SEVRES (FRANCE)
|
| The Bureau International des Poids et Mesures/International Astronomical Union (BIPM/IAU) Joint Committee on Relativity for space-time reference systems and metrology (JCR) has worked in collaboration with the IAU Working Group on relativity for celestial mechanics and astrometry (RCMA) on the problems of astronomical relativistic space-time reference frames. The RCMA has proposed to the IAU a consistent framework for defining the barycentric and geocentric celestial reference systems at the first post-Newtonian ... |
|
| Kinematical Relativistic Corrections for Earth's Rotation Parameters |
MAR 2000 |
11 pages |
| Authors:
V. A. Brumberg; Pierre Bretagnon; RUSSIAN ACADEMY OF SCIENCES SAINT PETERSBURG INST OF APPLIED ASTRONOMY
|
| Dynamical theories of the Earth's rotation like SMART97 (Bretagnon et al., 1998) are to be considered in a DGRS (dynamically non-rotating geocentric reference system) (Brumberg et al., 1996). Such a theory gives the explicit expressions in terms of TCG (Geocentric Coordinate Time) of three Euler angles relating a DGRS to the ITRS (International Terrestrial Reference System). These angular quantities together with their TCG derivatives enable one to get all of ... |
|
| Time and Standards - An Overview |
MAR 2000 |
9 pages |
| Authors:
Bernard Guinot; OBSERVATOIRE DE PARIS (FRANCE)
|
| Have the frequency stability and accuracy reached a level of quality that exceeds needs in astrometry? This paper attempts to answer this question. After recalling current performances of time and frequency standards and their use in establishing time scales, the author considers their limitations in astronomical observations and studies. For expressing the value of almost all quantities, the accuracy of the frequency standards is sufficient. However, an improved stability could ... |
|
| Report on Astronomical Constants |
MAR 2000 |
12 pages |
| Authors:
Toshio Fukushima; TOKYO ASTRONOMICAL OBSERVATORY MITAKA (JAPAN)
|
| This paper reviews recent progress in the determinations of astronomical constants. By collecting the results on scale constants and precession, the author updates the former International Astronomical Union (IAU) File of Current Best Estimates (of astronomical constants) (Standish, 1995). The revised list is illustrated in Table 3. Here, the references for the items that differ from the previous version are as follows: (1) Tholen and Buie (1997) for the mass ... |
|
| Report of Special Commission 3 of IAG |
MAR 2000 |
17 pages |
| Authors:
Erwin Groten; DARMSTADT UNIV (GERMANY)
|
| Since the last presentation of Special Commission 3 on numerical values of fundamental geodetic parameters at the International Astronomical Union (IAU) General Assembly at Kyoto in 1997, there were some conceptual as well as fundamental numerical changes. The four basic parameters of geodetic (ellipsoidal) reference systems (GRS) can no longer be considered as constant with time: J(sub 2), alpha, omega, and GM have to be replaced by clearly (+/- 10(exp ... |
|
| Report of the Working Group 'Relativity for Celestial Mechanics and Astrometry' |
MAR 2000 |
11 pages |
| Authors:
M. Soffel; TECHNISCHE HOCHSCHULE DRESDEN (GERMANY)
|
| This is a brief report on the work done by the International Astronomical Union (IAU) working group "Relativity for Celestial Mechanics and Astrometry." The first central task of the working group was to recommend some specific form of the metric tensor that is related to the distance of two neighboring points in space-time with coordinates. The metric tensor allows one to derive translational and rotational equations of motion of bodies, ... |
|
| 25 Jahre - Institut fuer Geodaesie, Teil 1: Wissenschaftliche Beitraege und Berichte (25 Years - Institute of Geodesy, Part 1: Scientific Contributions and Reports) |
01-Jan-2000 |
330 pages |
| Authors:
Wilhelm Caspary; Hans Heister; Albert Schoedlbauer; Walter Welsch; UNIVERSITAET DER BUNDESWEHR MUENCHEN NEUBIBERG (GERMANY) STUDIENGANG GEODASIE UND GEOINFORMATION
|
| This volume is a collection of scientific articles and reports from contributors to the Institute of Geodesy over the last 25 years. The contributions in this volume focus on the following topics: Observation of time-dependent deformations of objects through continuous measurement; Geodetic astronomy - Prospects at the threshold of the 21st century; Geodesic analysis of dynamic processes; Testing of geodesic instruments; Computer program to better understand geographical aspects of meridian ... |
|
| 25 Jahre - Institut fuer Geodaesie, Teil 2: Forschungsarbeiten und Veroeffentlichungen (25 Years - Institute of Geodesy, Part 2: Research Areas and Publications) |
01-Jan-2000 |
117 pages |
| Authors:
Wilhelm Caspary; Hans Heister; Albert Schoedlbauer; Walter Welsch; UNIVERSITAET DER BUNDESWEHR MUENCHEN NEUBIBERG (GERMANY) STUDIENGANG GEODASIE UND GEOINFORMATION
|
| This volume reports on the main research activities of the Institute of Geodesy, presents a complete overview of all of its publications, and lists seminars and workshops that the Institute has sponsored. |
|
| 25 Jahre - Institut fuer Geodaesie, Teil 3: Aus dem Leben des Instituts (25 Years - Institute of Geodesy, Part 3: The Life of the Institute) |
01-Jan-2000 |
152 pages |
| Authors:
Wilhelm Caspary; Hans Heister; Albert Schoedlbauer; Walter Welsch; UNIVERSITAET DER BUNDESWEHR MUENCHEN NEUBIBERG (GERMANY) STUDIENGANG GEODASIE UND GEOINFORMATION
|
| This volume reports on the community life of the Institute of Geodesy. The volume includes biographies of prominent professors, profiles of other Institute professors, synopses of projects and lectures that have taken place worldwide, and synopses of team projects. |
|
| A New Heat Flux Formulation Based on Effective Surface Temperatures, With Extension to the Nocturnal Boundary Layer |
10 AUG 1999 |
9 pages |
| Authors:
Larry Mahrt; Jielun Sun; OREGON STATE UNIV CORVALLIS
|
| The state of the art concepts of the influence of surface heterogeneity on the atmospheric boundary layer are studied using several new data sets. This analysis shows that the internal boundary layer theory is valid only with sharp well defined surface changes. With more typical surface heterogeneity and with very stable conditions, the concept and models of the internal boundary layer do not apply. The concepts of the thermal roughness ... |
|
| An Analysis of Gravity-Field Estimation Based on Intersatellite Dual-1- Way Biased Ranging |
MAY 1999 |
196 pages |
| Authors:
J. B. Thomas; JET PROPULSION LAB PASADENA CA
|
| The GRACE (Gravity Recovery And Climate Experiment) mission is designed to make global, highly accurate measurements of the Earth's gravity field with high spatial resolution. Ancillary GPS occultation measurements are also to be carried out for atmospheric monitoring. In the dual-1-way biased ranging of this mission, the range between two satellites separated by 100 to 200 km in nearly polar, coplanar, circular orbits, is measured to very high precision, to ... |
|
| Tomographic Inversion of Crosshole Radar Data: Confidence in Results |
1999 |
11 pages |
| Authors:
William P. Clement; Michael D. Knoll; BOISE STATE UNIV ID CENTER FOR THE GEOPHYSICAL INVESTIGATION OF THE SHALLOW SUBSURFACE
|
| Crosshole radar tomography is increasingly being used to characterize the shallow subsurface and to monitor hydrologic processes. Although tomographic inversion provides a subsurface model, confidently interpreting the resulting image can be challenging. We conducted a simple modeling study to better understand the capabilities and limitations of tomographic inversion. We start with a known earth model, simulate a tomography experiment, and invert the synthetic data. We investigate the effects of straight ... |
|
| A Very-Short-Baseline Time Transfer Experiment Using Two Geodetic-Quality GPS Receivers and Carrier Phase Techniques |
Dec-1998 |
14 pages |
| Authors:
John A Davis; Jon D Clarke; Andrew Lowe; NATIONAL PHYSICAL LAB TEDDINGTON (UNITED KINGDOM)
|
| For over 10 years primary timing laboratories have used signals from the Global Positioning System (GPS) to compare atomic timescales. The method used, the common-view of GPS satellites, does not use the GPS system for its full potential. Recently, there has been much interest in using geodetic-quality GPS receivers for time transfer. The result has been a substantial improvement in the precision of the resulting time and frequency transfers. In ... |
|
| Error Analysis of Padding Schemes for DFT's of Convolutions and Derivatives |
14 SEP 1998 |
29 pages |
| Authors:
Christopher Jekeli; OHIO STATE UNIV COLUMBUS DEPT OF CIVILAND ENVIRONMENTAL ENGINEERING AND GEODETIC SCIENCE
|
| Various padding schemes have been proposed in the geodetic literature to avoid the error committed by approximating a linear convolution with a cyclic convolution; the latter is needed to implement Fast Fourier transform techniques. The method of extending the signal with zeros and the kernel with its own values yields equality between the two types of convolutions. However, it is shown using error transfer functions and numerical examples that the ... |
|
| Satellite Imagery and Remote Sensing Methodology: Applied to Change Detection Along Fountain Creek |
17 APR 1998 |
75 pages |
| Authors:
Kristen Gilbert; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH
|
| Remote sensing methodology and GIS technology provide the resources needed to gain an improved understanding of the Earth as a system. Worldwide population growth and development amplify the naturally occurring changes on the Earth's surface and give birth to new types of changes. With the help of remote sensing technology, the energy radiated by surface features or reflected off the Earth's surface by the sun can be ... |
|
| European Geophysical Society (Annales Geophysicae), Part 3, Space & Plane Sciences, Supplement 3 to Volume 16 |
1998 |
244 pages |
| Authors:
Arne K. Richter; EUROPEAN GEOPHYSICAL SOCIETY KATLENBURG-LINDAU (GERMANY)
|
| Compilation of abstracts collected for the conference entitled European Geophysical Society 23 General Assembly. Sections include: (1) solid earth geophysics, (2) geodesy, (3) hydrological sciences, (4) oceans and atmosphere, (5) solar terrestrial sciences, (6) planetary and solar system sciences, (7) nonlinear processes in geophysics, and (8) natural hazards. |
|
| Organizing National Level Imagery and Mapping |
1998 |
8 pages |
| Authors:
John Strebeck; NATIONAL DEFENSE UNIV WASHINGTON DC CENTER FOR COUNTERPROLIFERATION RESEARCH
|
| One category of battlespace information particularly relevant to operational commanders is the physical environment. Imagery, imagery intelligence, and geospatial information (mapping, charting, and geodesy) portray that environment and are thus important bands along the battlespace information spectrum. They enable commanders to place myriad battlespace data into a framework based on time and location. Fusing all data sources in this manner allows for the development of an awareness of the battlespace ... |
|
| Comptes Rendus of the XXI General Assembly of the IUGG, Boulder, Colorado July 2-14 1995. Geophysics and the Environment |
97 |
335 pages |
| Authors:
AMERICAN GEOPHYSICAL UNION WASHINGTON DC
|
| The report "Comptes Rendus of the XXI General Assembly of the IUGG" contains the proceedings of the International Union of Geodesy and Geophysics (IUGG) General Assembly, the statutes and bylaws of the IUGG and each of its seven Associations, and a listing of the assembly registrants. "Geophysics and the Environment" was the theme for the XXI General Assembly of IUGG. Contributed papers covered all areas of geophysics. The officers of ... |
|
| WGS 84 Coordinate Validation and Improvement for the NIMA and Air Force GPS Tracking Stations |
NOV 96 |
33 pages |
| Authors:
James Cunningham; Virginia L. Curtis; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| Using 10 days of Global Positioning System (GPS) pseudorange and carrier phase data collected in 1995 from 31 stations and 24 Block II/IIA satellites, estimates of GPS clocks, orbits, and tracking station coordinates were generated. The 31 sites consisted of the 12 National Imagery and Mapping Agency (NIMA) and Air Force operational stations, an additional NIMA site at Holloman Air Force Base, and 18 International GPS Service for Geodynamics (IGS) ... |
|
| Surface Observation Climatic Summary (SOCS): Wide Awake Field, Azores (Computer Diskette). |
22 JUL 1996 |
|
| Authors:
AIR FORCE COMBAT CLIMATOLOGY CENTER SCOTT AFB IL
|
| File characteristics: Datafile (1 file); ASCII character set. Physical description: 1 computer diskette; 3 1/2 in.; high density; 1.44M. System requirements: PC compatible. Summaries of hourly data plus all available Summary of Day data are presented in eight parts: (1) Weather conditions and atmospheric phenomena; (2) Precipitation, snowfall, and snowdepth; (3) Surface winds; (4) Ceiling vs visibility and skycover; (5) Daily maximum, minimum, and mean temperatures; extreme maximum and minimum ... |
|
| Technical Review of the Vector Product Format Symbol Set Prototype |
12 APR 96 |
22 pages |
| Authors:
Jerry L. Landrum; Kevin B. Shaw; Thomas A. Fetterer; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS MARINE GEOSCIENCES DIV
|
| Vector Product Format Symbology (VPFS) is a standard structure for the organization of digital symbology to be used with Vector Product Format (VPF) products. The symbols it contains are designed to be compatible with a wide variety of applications which use VPF. VPFS supports a greatly enriched symbology by incorporating logical conditions that allow the association of symbology with feature attribute values. VPFS encompasses most, if not all, of the ... |
|
| Determination of Doppler (Laser) Geodesic Network Longitude Zero Point Differences |
13 MAR 96 |
19 pages |
| Authors:
Wu Lianda; Li Zhenghang; NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH
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| Longitudes associated with Doppler (laser) positioning measured by survey stations only possess relative significance. In order to obtain absolute longitudes, it is necessary to determine orientations of Doppler (laser) network longitude zero points in BIH-CIO systems. This article discusses making use of small numbers of optical observations to determine longitude zero point difference questions, giving dynamic determination and geometrical determination methods. In conjunction with this, discussions are made of their ... |
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| Handbook for Transformation of Datums, Projections, Grids and Common Coordinate Systems |
JAN 96 |
165 pages |
| Authors:
Frederick Gloeckler; Richard Joy; Justin Simpson; Daniel Specht; ARMY TOPOGRAPHIC ENGINEERING CENTER ALEXANDRIA VA
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| This document provides Army organizations and agencies with general guidance on selecting the appropriate methods for shifting between local geodetic datums and the World Geodetic System (WGS), and for converting Cartesian and map projection coordinates to and from geodetic coordinates. This guidance is provided to aid the Army community in selecting datum shift algorithms, in developing, selecting, and maintaining software using these algorithms, and in implementing this software to support ... |
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| Handbook for Transformation of Datums, Projections, Grids and Common Coordinate Systems |
JAN 96 |
166 pages |
| Authors:
Frederick Gloeckler; Richard Joy; Justin Simpson; Daniel Specht; James Ackeret; ARMY TOPOGRAPHIC ENGINEERING CENTER ALEXANDRIA VA
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| This document provides Army organizations and agencies with general guidance on selecting the appropriate methods for shifting between local geodetic datums and the World Geodetic System (WGS), and for converting Cartesian and map projection coordinates to and from geodetic coordinates. This guidance is provided to aid the Army community in selecting datum shift algorithms, in developing, selecting, and maintaining software using these algorithms, and in implementing this software to support ... |
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Geodesy
