Mapping the risks : assessing the homeland security implications of publicly available geospatial information
Assesses the homeland security implications of publicly available geospatial data and information. Following the attacks of September 11, 2001, many agencies within the federal government began restricting some of their publicly available geospatial data and information from such sources as the World Wide Web. As time passes, however, decisionmakers have begun to ask whether and how such information specifically helps potential attackers, including terrorists, to select U.S. homeland sites and prepare for better attacks. The research detailed in this book aims to assist decisionmakers tasked with the responsibility of choosing which geospatial information to make available and which to restrict.
Lessons for the Global Spatial Data Infrastructure: International Case Study Analysis
One-liner: An analysis of international collaboration for the Global Spatial Data Infrastructure (GSDI), this book provides ten in-depth international and regional collaboration case studies to assess lessons learned for GSDI development and implementation. Geospatial data, information, and technologies are becoming more important and more common tools throughout the world because of their capacity to improve government and private-sector decisionmaking. Geospatial information is developed, used, maintained, and shared in a range of application areas, including transportation, environment, natural resources, agriculture, telecommunications, mapping, health, emergency services, research, and national security. Sharing geospatial data in such applications helps improve the management of public infrastructures and natural resources and produces numerous other benefits. This report presents an analysis of international collaboration for the Global Spatial Data Infrastructure (GSDI). Ten in-depth international and regional collaboration case studies were conducted to assess lessons learned for GSDI development and implementation. This report provides useful information to the GSDI and to regional spatial data infrastructure organizations. It should also be of interest to national governments, nongovernmental organizations, researchers, and others who are interested in international collaboration, geospatial data sharing, and geospatial technologies. cp
Space Qualification Testing of a Shape Memory Alloy Deployable CubeSat Antenna
Abstract : Increasingly capable CubeSat missions require antenna with improved Radio Frequency performance over the traditional CubeSat antennas. Deployable quadrifilar helical antennas (QHA) enable an acceptable stowing volume and deploy to provide increased gain and bandwidth over traditional patch and dipole antennas. Extensive ground testing is required to ensure the antenna is space qualified and to characterize the antenna deployment in the space environment. AFIT requires a QHA to perform a future CubeSat geolocation mission and contracted Helical Communication Technologies (HCT) to design and manufacture a Shape Memory Alloy (SMA) L-band deployable QHA. Vibration, thermal vacuum, laser vibrometer, and Voltage Standing Wave Ratio (VSWR) experiments were conducted on the HCT antenna to verify the hardware in a simulated launch environment and to characterize the SMA deployment in the simulated space environment.The HCT QHA successfully passed all required NASA General Environmental Verification Standards space qualification testing. Several anomalies experienced by the QHA encourage a redesign. The deployed antenna length varied from 250-290 mm and future RF testing is required to determine if the antenna geometry variations are significant enough to impact the geolocation mission.This research documents the test results for a QHA deployable CubeSat antenna testing and aids the development of CONOPS for the future AFIT CubeSat mission utilizing the HCT QHAs.