Space Vehicles Commons^™

Introduction To Hyperspectral Image Analysis, Peg Shippert

Online Journal of Space Communication

The most significant recent breakthrough in remote sensing has been the development of hyperspectral sensors and software to analyze the resulting image data. Fifteen years ago only spectral remote sensing experts had access to hyperspectral images or software tools to take advantage of such images. Over the past decade hyperspectral image analysis has matured into one of the most powerful and fastest growing technologies in the field of remote sensing.

The "hyper" in hyperspectral means "over" as in "too many" and refers to the large number of measured wavelength bands. Hyperspectral images are spectrally overdetermined, which means that they provide …

Spectrometry And Hyperspectral Remote Sensing Of Urban Road Infrastructure, Martin Herold, Margaret E. Gardner, Val Noronha, Dar A. Roberts

Online Journal of Space Communication

Based on a comprehensive regional spectral library from spectrometer ground measurements and high-resolution hyperspectral AVIRIS data, this research investigates generic spectral characteristics, and related mapping capabilities and limitations for extracting roads of various types, delineating road centerlines, and surveying pavement quality within the urban environment. The methods are generally successful in identifying roads and road pavement types, but inaccuracies arise from spectral similarities between asphalt surfaces and specific roofing materials. Findings indicate that it is possible to spectrally characterize and estimate age of pavement and a few specific asphalt surface quality parameters (e.g. raveling). Finally, this research argues that the …

Introduction To Remote Sensing: Online Resources, Hugh Bloemer, Dale Quattrochi

Online Journal of Space Communication

Several quite useful online resources have been developed throughout the world. Below are links to some of these online Remote Sensing resources.

Ohioview: A Case Study In Progress, James K. Lein

Online Journal of Space Communication

OhioView is a consortium of 10 state universities within Ohio established to promote the low-cost distribution of US Government civilian satellite data for public use. Dedicated to the goal of reducing the financial and technological barriers to use remotely sensed satellite data, OhioView has made a significant contributions to the educational, research and public use of satellite imagery through a continuing program of focused and applied land cover studies, expanded university level teaching, and public and private outreach and training. A grassroots organization formed in 1996 by its member universities, OhioView's mission is to develop remote sensing applications, create educational …

Introduction To Remote Sensing: Remote Sensing Satellites, Hugh Bloemer, Dale Quattrochi

Online Journal of Space Communication

Introduction to Remote Sensing: Remote Sensing Satellite.

Introduction To Remote Sensing: Science For Society, Ronald J. Birk, Tsengdar Lee

Online Journal of Space Communication

Science for Society: Extending Earth Science Research Results into Decision Support Tools

Introduction To Remote Sensing: Americaview Consortium, Hugh Bloemer, Dale Quattrochi

Online Journal of Space Communication

The AmericaView Consortium is a network of several state consortia whose goal is to expand remote sensing education, research and innovation.

A Remote Sensing Tutorial, Nicholas M. Short

Online Journal of Space Communication

A Remote Sensing Tutorial

Issue 3: From The Guest Editors, Hugh Bloemer, Dale Quattrochi

Online Journal of Space Communication

What is Remote Sensing?

Acts Shut Down: April 28, 2004, Frank Gargione

Online Journal of Space Communication

The Advanced Communications Technology Satellite (ACTS) was shut down on Wednesday April 28 after more than ten years in orbit. The satellite, still fully operational and in the hardware configuration set at launch, was shut down due a funding shortfall, in spite of repeated efforts by NASA and the Ohio Consortium for Advanced Communications to find new sources of support.

Edward Ashford, Edward Ashford

Online Journal of Space Communication

Corporate Development Unit Leader at SES-ASTRA

Jeffrey Grant, Jeffrey Grant

Online Journal of Space Communication

Vice President and Chief Technical Officer of Astrolink, a joint venture of several communications companies

Edward Fitzpatrick, Edward Fitzpatrick

Online Journal of Space Communication

Vice President of Hughes Network Systems

Tom Brackey, Tom Brackey

Online Journal of Space Communication

Executive Director, Technical Operations for External Affairs, and Chief Scientist for internal technical matters,Hughes Space and Communications Company

Joseph Rothenberg, Joseph Rothenberg

Online Journal of Space Communication

NASA's Associate Administrator for Space Flight

Gerald Barna, Gerald Barna

Online Journal of Space Communication

Acting Deputy Director of the NASA Glenn Research Center

Advanced Shipboard Communications Demonstrations With Acts, Roy A. Axford, T. C. Jedrey, M. Rupar

Online Journal of Space Communication

For ships at sea, satellites provide the only option for high data rate (HDR), long haul communications. Furthermore the demand for HDR satellite communications (SATCOM) for military and commercial ships, and other offshore platforms is increasing. Presently the bulk of this maritime HDR SATCOM connectivity is provided via C-band and X-band. However, the shipboard antenna sizes required to achieve a data rate of, say T1 (1.544 Mbps) with present C-/X-band SATCOM systems range from seven to ten feet in diameter. This limits the classes of ships to which HDR services can be provided to those which are large enough to …

A Ka-Band High Data Rate Shipboard Satellite Terminal, M. Rupar, David Beering, D. Hoder

Online Journal of Space Communication

A fully articulated steerable shipboard satellite antenna system operating at Ka-band was developed by engineers from the Naval Research Laboratory (NRL), NASA's Glenn Research Center, and a number of industry partners. A series of tests conducted in October of 1998 on Lake Michigan achieved an unparalleled data rate transmission of 45 megabits per second (Mbps) between a moving vessel at sea and a fixed-earth station using NASA's Advanced Communications Technology Satellite (ACTS). Network and application layer tests ran concurrently with the data rate transmission trials, examining TCP/IP file transfers, video and voice transfer technologies, and Asynchronous Transfer Mode (ATM) techniques. …

Gigabit Satellite Network For Nasa's Advanced Communication Technology Satellite (Acts): Features, Capabilities, And Operations, M. Bergamo, D. Hoder

Online Journal of Space Communication

This paper describes the Gigabit Satellite Network (GSN) being developed under joint sponsorship of NASA and ARPA. The system will use the wide-band Satellite Switched Time Division Multiple Access (SS-TDMA) capability and hopping beam antennas of NASA's Advanced Communications Technology Satellite (ACTS). The GSN network will provide full-duplex SONET services over satellite at OC-3 (155.54 Mb/s) and OC-12 (622.078 Mb/s) rates. Typical applications will include connection of distributed SONET/ATM fiber "islands" over satellite, wide-area distributed supercomputer networking, high-definition digital TV, and high-speed file transfer.

The RF link consists of 30 GHz uplink and 20 GHz downlink signals transmitted using a …

Acts 118x Final Report High-Speed Tcp Interoperability Testing, W. Ivancic, M. Zernic, D. Hoder, D. Brooks, David Beering, A. Welch

Online Journal of Space Communication

With the recent explosion of the Internet and the enormous business opportunities available to communication system providers, great interest has developed in improving the efficiency of data transfer using the Transmission Control Protocol (TCP) of the Internet Protocol (IP) suite. The satellite system providers are interested in solving TCP efficiency problems associated with long delas and error-prone links. Similarly, the terrestrial community is interested in solving TCP problems over high-bandwidth links. Whereas the wireless community is intested in improving TCP performance over bandwidth constrained, error-prone links.

NASA realized that solutions had already been proposed for most of the problems associated …