Intercomparison of GEOS-A observation systems

Geodetic satellite observation systems comparison

EOSDIS/DADS requirements

A brief summary of the Earth Observing System Data and Information System (EOSDIS) Core System (ECS) Data Archive and Distribution System (DADS) requirements is given. Among the requirements are the following: the ECS relationship to EOSDIS Version-O; phased implementation of ECS; and data ingest, archive, and distribution daily data volumes anticipated at each of the 7 Distributed Active Archive Centers (DAAC's)

Data compression opportunities in EOSDIS

The Earth Observing System Data and Information System (EOSDIS) is described in terms of its data volume, data rate, and data distribution requirements. Opportunities for data compression in EOSDIS are discussed

Short arc optical survey techniques

The effect of the gravity parameter, mu, the choice and local survey of the fixed origin station, and the choice of initial datum on the results of short arc satellite survey adjustments were investigated using GEOS 1 MOTS optical observations from 13 stations. It is concluded that each of these parameters has an effect on derived network scale on the order of 0.000002 for the nominal variations used. A particular solution using assumed best available values for these parameters is recommended

GEOS satellite tracking corrections for refraction in the troposphere

Comparison of magnitude at different elevation angles of tropospheric refraction formulation

Caravaggio’s Faith and Good Works: A New Interpretation of Saint Jerome Writing, and Its Implications About the Artist

Over the past one-hundred years, much effort has been given to the analysis and interpretation of the many paintings produced by Michelangelo Merisi da Caravaggio during his short lifetime. Unfortunately, many of the artist’s works have gone vastly understudied, such as his Saint Jerome Writing, completed in 1606. Several scholars have touched on the painting briefly over the years, such as Howard Hibbard, who suggests in his 1985 monograph, Caravaggio, that the piece touches on the transiency of life, as well as Sybille Ebert- Schifferer, who adds in her 2009 book, Caravaggio: The Artist and His Work, that the painting appears to be unfinished. John T. Spike also argues in his revised, 2010 monograph, Caravaggio, that Saint Jerome Writing marks a significant shift in style for Caravaggio, noting a looseness to the brushstrokes that was not present in the artist’s previous works. Individually, each of these assertions do not amount to much, however, like many of Caravaggio’s other paintings, deeper intimations can often be divulged. This paper, through the use of previous scholarship, formal analysis, biographical content about the artist, and information regarding the painting’s conception, serves to put forth the notion that Saint Jerome Writing is not as straightforward as art historians currently seem to believe. In fact, this paper argues that Caravaggio’s Saint Jerome Writing is meant to not only promote Counter-Reformation ideas surrounding faith and good works, but to take viewers on a journey into the mind of the artist, revealing his deep identification with Jerome

A satellite altimeter bias recovery simulation

GEOS-3 altimeter bias recovery simulation using range and angle tracking dat

MAGSAT data processing: A report for investigators

The in-flight attitude and vector magnetometer data bias recovery techniques and results are described. The attitude bias recoveries are based on comparisons with a magnetic field model and are thought to be accurate to 20 arcsec. The vector magnetometer bias recoveries are based on comparisons with the scalar magnetometer data and are thought to be accurate to 3 nT or better. The MAGSAT position accuracy goals of 60 m radially and 300 m horizontally were achieved for all but the last 3 weeks of Magsat lifetime. This claim is supported by ephemeris overlap statistics and by comparisons with ephemerides computed with an independent orbit program using data from an independent tracking network. MAGSAT time determination accuracy is estimated at 1 ms. Several errors in prelaunch assumptions regarding data time tags, which escaped detection in prelaunch data tests, and were discovered and corrected postlaunch are described. Data formats and products, especially the Investigator-B tapes, which contain auxiliary parameters in addition to the basic magnetometer and ephemeris data, are described

Analysis of ionospheric refraction error corrections for GRARR systems

A determination is presented of the ionospheric refraction correction requirements for the Goddard range and range rate (GRARR) S-band, modified S-band, very high frequency (VHF), and modified VHF systems. The relation ships within these four systems are analyzed to show that the refraction corrections are the same for all four systems and to clarify the group and phase nature of these corrections. The analysis is simplified by recognizing that the range rate is equivalent to a carrier phase range change measurement. The equation for the range errors are given

Star Catalogs on Punched Cards and Magnetic Tape

In connection with the calibration of the Minitrack satellite tracking stations, the Goddard Space Flight Center has had the contents of a number of star catalogs put on punched cards and magnetic tape. This report discusses the plate data reduction procedures, briefly describes the information on the punched cards and magnetic tape, and calls attention to other applications of the card and tape star catalogs. The Goddard Space Flight Center has offered to prepare duplicate catalogs for qualified organizations