WorldCat Identities

DEFENSE MAPPING AGENCY HYDROGRAPHIC/ TOPOGRAPHIC CENTER WASHINGTON DC

Overview
Works: 76 works in 77 publications in 1 language and 82 library holdings
Classifications: QA279, 526.9823
Publication Timeline
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Most widely held works by DEFENSE MAPPING AGENCY HYDROGRAPHIC/ TOPOGRAPHIC CENTER WASHINGTON DC
Recent Development in Astronomic Position Determinations( Book )

1 edition published in 1984 in English and held by 2 WorldCat member libraries worldwide

An advanced engineering model of an electro-optical star sensor system designed by Ball Aerospace Systems Division, incorporates a charge injection device (CID) detector having a 256 x 256 pixel array. The system is integrated with a Wild T-4 astronomic theodolite in the focal plane to replace the human eye. A star image is acquired and tracked across detector pixels to determine a time versus meridian angle intercept that is synchronized with a very accurate time. Zenith angle intercepts are also measured. Track position, interpolation, and data reduction algorithms are derived and incorporated into the system software to provide astronomic latitude and longitude to about + or - 0.1 arc second (1 sigma). This system is being built for the Defense Mapping Agency under an on-going technical development program to improve the accuracy of astronomic position determinations. The need for accuracy improvements, the limitations of conventional instruments, an analysis of major error sources, the results of previous developmental efforts, and the design and use of advanced production instruments are also presented. (Author)
Horizontal Datums for Nautical Charts( Book )

1 edition published in 1980 in English and held by 2 WorldCat member libraries worldwide

Marine navigation charts are based on many and varied geodetic datums in use throughout the world. These datums range from local datums to the DoD World Geodetic System (WGS) 1972. In many cases, the datums for adjoining charts will differ, although this difference will usually introduce only minor errors into the solution of navigational problems. There are times, however, when even small errors can be very disconcerting, if not dangerous, and it is under these conditions that it is advantageous for the navigator to possess some knowledge of the factors in datum selection and chart construction which lead to apparent discrepancies in position plotting. It is equally important for the chart compiler or cartographer to understand the basic principles of navigation and, therefore, the need for establishing clearly definable horizontal datums on charts. For this reason, the author has aimed at tracing the evolution of datums on Defense Mapping Agency (DMA) nautical charts, mainly for the benefit of cartographers who must realize how the product they produce impacts on the safety of navigation in ways other than the portrayal of up-to-date information such as navigation aids, depths, etc. This paper discusses the differences between chart datums and coordinates determined by using various navigation systems, accuracy requirements for nautical charts, navigation system accuracy requirements as related to datums, and datum transformation methods. (Author)
Use of LANDSAT for Navigation Products at DMA (Defense Mapping Agency)( Book )

1 edition published in 1983 in English and held by 2 WorldCat member libraries worldwide

LANDSAT exploitation for hydrographic support has been under study and in use on a limited scale for some time. The Defense Mapping Agency (DMA) has found LANDSTA's multispectral scanner imagery particularly useful in augmenting the completeness of its products. Recently, a program has been implemented using this remotely sensed imagery in routinely updating and maintaining nautical charts and publications. This paper provides a general description of the LANDSAT system and applications at DMA as well as limitations of its use in navigation. (Author)
Data Processing at the Global Positioning System Master Control Station( Book )

1 edition published in 1982 in English and held by 2 WorldCat member libraries worldwide

At the GPS Master Control Station, range and delta range measurement from remote, unmanned monitor stations are processed to generate satellite navigation messages daily. Data are edited, smoothed, and processed in a Kalman filter to generate estimates of ephermerides and all system clock, solar pressure, polar wander, and tropospheric states. This processing, and some examples of typical performance measures, are described. (Author)
African Doppler Surveys (ADOS)( Book )

2 editions published between 1983 and 1984 in English and held by 2 WorldCat member libraries worldwide

This report outlines a brief summary of the work, as of 15 June 1983, performed by the Defense Mapping Agency (DMA) under the African Doppler Survey (ADOS) project. In order to utilize the many Doppler surveys already completed (prior to ADOS) in Africa, a detailed search of the DMA's data bank was carried out during January-March 1983. The existing data, which showed promise of meeting the ADOS technical specification, were carefully sorted out, processed, computed and released to other ADOS Computing Centers. (Author)
The Geodetic Activities of the Department of Defense under the International Geophysical Year Programs( Book )

1 edition published in 1982 in English and held by 2 WorldCat member libraries worldwide

The International Geophysical Year (IGY) programs have special significance to geodesists. The ILGY witnessed the launching of the first manmade earth satellite and the beginning of the era of global geodesy. It is no wonder that the U.S. Department of Defense (DoD) with its global requirements developed an early interest in satellite geodesy. Specifically, this led to the use of early satellites of opportunity (and subsequently of dedicated satellites) for worldwide navigation, geodetic positioning and gravimetric investigations. In conjunction with other civilian satellite programs under the IGY, DoD played a major role in the achievement of geodetic goals, perhaps far beyond that which was envisioned originally
Bathymetric Data Reduction Subsystem (BDRS) by Gordon M Frank( Book )

1 edition published in 1980 in English and held by 1 WorldCat member library worldwide

The Bathymetric Data Reduction Subsystems(BDRS) represents a new concept in bathymetric data reduction processing. The BDRS is the primary support subsystem to the Bathymetric Information System(BIS). BIS is one of eight interactive data base systems to be developed under a global control system known as the Source Data Base System(SODS). SODS will provide users with both centralized access and information manipulation capability to these various information systems, including BIS. Users will have no direct access to BDRS, but they will be able to retrieve information from BIS through SODS. Through the use of various software programs the BDRS accepts digital data input from analog sources and magnetic tape. Output from the system will consist of proof plots, track-line generation, data base access and editing, and 'quick look' capabilities into the database. New developments contained in the system are: Voice recognition digitization system which allows the input of sounding data by spoken word; digitization of fathograms and the subsequent proof-plot generation using ship's log and the digitized soundings; and, the ability to geo-section portions of the data base using circular, triangular, or polygonic searches to define user areas of interest. (Author)
The Derivation of the Mapping Equations and Distortion Formulae for the Satellite Tracking Map Projections by Gregory C Arnold( Book )

1 edition published in 1984 in English and held by 1 WorldCat member library worldwide

Rigorous derivations of the Satellite Tracking conic and cylindrical projections are presented. The first fundamental quantities of the projection surface parameters as functions of spherical earth parameters are developed. Using these quantities, newly derived in this paper, general equations of the distortion in length, area, and azimuth are developed. Examples of the graticule and distortion values are given for the Landsat orbit. (Author)
A Comparison of Pole Positions Derived from GPS Satellite and Navy Navigation Satellite Observations( Book )

1 edition published in 1982 in English and held by 1 WorldCat member library worldwide

The observation of the motion of the Earth's spin axis with respect to the crust has been done continuously sincce the latter part of 1899 by the International Service. With the advent of new technologies, new determinations of polar motion have been possible. Doppler tracking of the Navy Navigation Satellites has provided estimates of the polar motion on a permanent basis since 1969. Currently, these estimates are done at the Defense Mapping Agency and are distributed to several agencies including the Bureau International de l'Heure (BIH), which has the responsibility of centralizing polar motion data. The NAVSTAR Global Positioning System (GPS) is a new navigation satellite system which will eventually replace the existing Navy Navigation Satellite System. As a byproduct of the orbit estimation process for the GPS satellites, values for the position of the pole are determined. In this paper the two different methods for computing the pole's position from satellite observations are described. The most recent results from each method are compared to each other and to the standard BIH values. (Author)
General Purpose Least-Squares Adjustment of IPS Data( Book )

1 edition published in 1981 in English and held by 1 WorldCat member library worldwide

Many of the IPS survey projects can easily be designed to form an interconnected network which lends itself to adjustment by the least-squares method. While a rigorously modeled IPS adjustment procedure has not yet been developed, DMA has been using a general purpose least-squares adjustment program for several years on IPS networks. The technique and results are discussed. (Author)
Application of SLF (Standard Linear Format) to Digital Hydrographic Products( Book )

1 edition published in 1984 in English and held by 1 WorldCat member library worldwide

With an ever increasing number of new navigation, weapon, and training systems being developed which use digital cartographic information, the Defense Mapping Agency (DMA) can no longer provide system specific, digital products. DMA has adopted an internal digital data exchange format, called Standard Linear Format (SLF), to permit the exchange of digital data between various production elements. The DMA Feature File, a dictionary of cartographic features and attributes to describe those features, has been developed to standardize digital cartographic features. To test these standards, a digital chart of Portsmouth, Virginia has been produced using the DMA Feature File features encoded in SLF. This digital prototype is being evaluated for its ability to serve as a multiproduct data base to satisfy both digital and paper chart requirements
Automated Cartographic Products( Book )

1 edition published in 1980 in English and held by 1 WorldCat member library worldwide

The Defense Mapping Agency Hydrographic/Topographic Center (DMAHTC) is engaged in researching, planning, compiling, and constructing charts, digital graphics and data bases, and plotter-derived support products through the use of the Advanced Cartographic Production System (ACPS). This presentation highlights the cartographic products generated in support of the military and civil mapping requirements. (Author)
The LONARS - Aided Doppler Solution - A New Method for Precise Positioning at Sea( Book )

1 edition published in 1982 in English and held by 1 WorldCat member library worldwide

LONARS is a precision position-fixing system based primarily on the use of LORAN-C Radio Navigation. This system is used to precisely position test platforms in a 2500 square mile ocean area off the Florida coast. To meet future stringent accuracy requirements, APL and DMA personnel undertook an at-sea calibration of LONARS during April 1980. The single pass Doppler solution using the Magnavox Geoceier and DMAHTC precise ephemeris was chosen as the calibration standard. The LONARS system was used to model ship's drift during each Doppler pass. Included in the paper is an analysis of significant error sources in the Doppler fix, the utility of shore-ship single pass translocation, and a summary of operational problems encountered during the at-sea calibration. The estimated accuracy of LONARS-Aided Doppler was found to be 10 meters one-sigma. (Author)
The Defense Mapping Agency Hydrographic/Topographic Center Geodetic Survey Squadron's Gravity Survey Program in Support of DoD Weapons Systems( Book )

1 edition published in 1982 in English and held by 1 WorldCat member library worldwide

Since the early 1960's, the DMAHTC/GSS has been conducting gravity surveys in support of the various Department of Defense (DoD) weapon systems. The surveys have been conducted worldwide, on nearshore areas and on land. A variety of supporting positioning systems have been utilized. Gravity Survey Techniques and Data Reduction programs have been developed to process vast quantities of gravity data. The DMAHTC/GSS has been a world leader in establishing gravity base station networks and in writing the first set of gravity survey standards and field survey specifications for land and marine gravity surveys. (Author)
Preliminary Evaluation of Doppler-Determined Pole Positions Computed Using World Geodetic System 1984( Book )

1 edition published in 1986 in English and held by 1 WorldCat member library worldwide

Since 1975, the Defense Mapping Agency (DMA) has been determining polar motion as a byproduct of computing the precise orbits of the Navy Navigation Satellite System (NNSS) satellites. The orbit determination process currently incorporates the NSWC 9Z2 terrestrial reference system and the NWL 1OE-1 Earth Gravitational Model (EGM) to degree 28 and order 27. The World Geodetic Systme 1984 (WGS 84), developed by DMA, will replace the NSWC 9Z2/1OE-1 system for NNSS orbit determination. The WGS 84 EGM to degree and order 41 will be used. This paper presents the results of two experiments which compared pole positions computed in the two systems. These comparisons indicate that use of WGS 84 improves agreement between pole position values resulting from the Nova-class satellite oorbit solutions and the values determined by other modern techniques. Keywords: Nova satellite; and Oscar satellite
Automated Slope Generation Using Raster Technology( Book )

1 edition published in 1981 in English and held by 1 WorldCat member library worldwide

The Sci-Tex Response 250 Mapping System has been in production at the Defense Mapping Agency Hydrographic/Topographic Center (DMAHTC) for the past two years. Initially acquired for foreign chart modification and color separation, this cartographic system has had a significant impact in rapid response situations. Recent gains in slope generation have further enhanced the capabilities of this automated tool. (Author)
An interactive FORTRAN program for determining reliability of pseudo-range geodetic point positioning using the global positioning system by James R Ackeret( Book )

1 edition published in 1984 in English and held by 1 WorldCat member library worldwide

A transportable, generic, interactive FORTRAN program for the covariance analysis off pseudo-range experiments in the Global Positioning System (GPS) is presented for use in simulation studies, experiment planning and systems development. The interactive mode is especially suited for covariance analyses involving multiple parameters, by allowing ease of operation for data production and providing savings in time when computing geodetic point positioning. The mathematical models on which the program is based provide an overview of the GPS point positioning process, emphasizing the areas of interest to geodesy. Also, special emphasis is placed upon station tracking geometry. The FORTRAN program allows for understanding correlation coefficients between the various parameters. A separate model suitable for covariance analysis is also presented. This interactive FORTRAN program has been implemented on the UNIVAC at Defense Mapping Agency Hydrographic/Topographic Center. The program is effective and efficient in helping to establish the realiability of the GPS point positioning technique. The program can be used in simulation studies, planning test and evaluation experiments, and GPS software development. The question/answer method has been used to develop this iterative program which enables the user to sit at the computer terminal (scope) and rapidly assess the expected accuracy of the GPPS point positioning technique as applied to a particular survey of interest
The Universal Grids: Universal Transverse Mercator (UTM) and Universal Polar Stereographic (UPS). Edition 1( )

1 edition published in 1989 in English and held by 0 WorldCat member libraries worldwide

This manual describes geographic to grid and grid to geographic conversions for the Universal Transverse Mercator (UTM) and the Universal Polar Stereographic (UPS) grids. It also discusses computations for convergence from geographic positions and from grid coordinates for the UTM grid, and convergence in the Polar Stereographic projection. Both mathematical and tabular methods are illustrated for the above items. A discussion of scale corrections is included. Transformations between the two grids, the Military Grid Reference System and the World Geographic Reference System are discussed. Finally, datum transformation methods, formulas and definitions are illustrated. Diagrams, textual information and software are provided ... UTM projection parameters, Accuracy of equations, Coordinate conversions, Convergence, Scale factors, UPS projection parameters, Grid tables
Fort Wainwright, Alaska (Including the Yukon Command Training Site and the Fairbanks Permafrost Station) Terrain Analysis( )

1 edition published in 1978 in English and held by 0 WorldCat member libraries worldwide

In stating the requirement for terrain analyses of selected installations, FORSCOM indicated that the purpose of the program is to assist military planners in future stationing decisions. To achieve this purpose, planners must obtain an appreciation of the on-post terrain that includes among many other things, knowledge of the suitability for conducting field training exercises involving maneuverability of troops and military vehicles. The degree of maneuverability that can be achieved is a function of several terrain factors including slope, surface configuration, soils, vegetative cover, and surface drainage, all of which are treated in the studies. Planners concerned with troop stationing also need certain off-post information such as statistics on housing, schools, hospitals, and public utilities in urban areas near installations, as well as pertinent data on air fields and ports in the vicinity. These things are also treated in the studies. Since the program under which this study was prepared is intended to serve troop stationing requirements, the support provided by the program to environmental requirements is only incidental. While some of the information contained in the studies may be useful as environmental base line data, the studies are by no means complete environmental inventories of the kind required in support of environmental impact assessments
Transformation Values Local DATUM to WGS 84 Eastern Test Range Area( )

1 edition published in 1988 in English and held by 0 WorldCat member libraries worldwide

A new World Geodetic System (WGS 84) was developed to replace the existing WGS 72 which has been in use for several years. This new WGS 84 system has an improved Earth Gravitational Model with orientation and scale changes from the WGS 72. The WGS 84 was developed using worldwide doppler derived station coordinates, laser satellite tracking data, satellite radar altimetry and gravity observations. Reference a. gives the unclassified information pertaining to the WGS 84 and it's relationship with various datums throughout the world. The following report provides transformation parameters to determine WGS 84 coordinates for geographical areas of interest to the Eastern Test Range. The delta values vary slightly (much much less 2m) from Reference a. due to direct satellite observation with doppler receivers in each area and reduction on the WGS 84 system which improves the accuracy of the results
 
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English (21)