Objective Prediction Of Slant Visual Range During Advective Fog Situations
DOWNLOAD
Download Objective Prediction Of Slant Visual Range During Advective Fog Situations PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Objective Prediction Of Slant Visual Range During Advective Fog Situations book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Objective Prediction Of Slant Visual Range During Advective Fog Situations
DOWNLOAD
Author : Edward B. Geisler
language : en
Publisher:
Release Date : 1980
Objective Prediction Of Slant Visual Range During Advective Fog Situations written by Edward B. Geisler and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with categories.
The final phase of the Air Force Geophysics Laboratory development and evaluation of a remote tower slant visual range (SVR) system is described. Remote tower forward scatter meter measurements of atmospheric extinction coefficient are used to estimate the SVR in the simulated approach zone. Three prediction techniques, Markov, Regression Estimate of Event Probabilities (REEP), and Equivalent Markov, are evaluated and yield probability estimates of below-limit SVR conditions for forecast times to 1 h. For Categories I and II conditions, such a system would have a probability of detection of below-limit SVR conditions of 91%. The Equivalent Markov technique is shown to provide accurate and reliable forecasts and yield slightly better results than Markov and REEP. (Author).
Development And Evaluation Of A Tower Slant Visual Range System
DOWNLOAD
Author : Edward B. Geisler
language : en
Publisher:
Release Date : 1979
Development And Evaluation Of A Tower Slant Visual Range System written by Edward B. Geisler and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Visibility categories.
Development And Evaluation Of A Tower Slant Visual Range System
DOWNLOAD
Author : Edward B. Geisler
language : en
Publisher:
Release Date : 1979
Development And Evaluation Of A Tower Slant Visual Range System written by Edward B. Geisler and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Markov processes categories.
Analysis of remote tower forward scatter meter measurements of extinction coefficient collected at the Air Force Geophysics Laboratory Weather Test Facility at Otis AFB, Massachusetts demonstrated the accuracy of a remote tower slant visual range (SVR) system. This report describes the final phase of the development and evaluation of a tower SVR system in which the remote tower approach has been extended to include Category I operations. Tests give additional evidence that the runway visual range (RVR) measurements are often not representative of pilot visibility during approach and touchdown. An examination of three short range prediction techniques for forecast times of 2, 5, 10, 30 and 60 minutes revealed that the Equivalent Markov technique provides accurate and reliable forecasts of below-limit SVR conditions and yields slightly better results than the Markov and REEP techniques. (Author).
Instrumentation Papers
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 1979
Instrumentation Papers written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Aeronautical instruments categories.
Scientific And Technical Aerospace Reports
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 1981
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Aeronautics categories.
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Technical Abstract Bulletin
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 1981
Technical Abstract Bulletin written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Science categories.
A Demonstration Test Of The Modular Automated Weather System Maws
DOWNLOAD
Author : Donald A. Chisholm
language : en
Publisher:
Release Date : 1980
A Demonstration Test Of The Modular Automated Weather System Maws written by Donald A. Chisholm and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Automatic meteorological stations categories.
A microprocessor-based automated airfield weather observing and forecasting system called MAWS (Modular Automated Weather System) was developed to demonstrate the feasibility of modernizing many of the observing and forecasting functions performed in operational base weather stations. Scott Air Force Base, Illinois, was chosen as the demonstration site and operations were conducted from January 1977 through January 1979. Weather sensors at five observation sites around the airfields were polled several times each minute, the data transmitted over commercial, voice-grade telephone lines to a central supervisory microprocessor where the data were suitably collated, averaged and formatted for display on alpha-numeric display devices at key locations and for magnetic tape archiving for post analysis. The demonstration confirmed that modernized weather support can be largely achieved with state-of-the-art, commercially available hardware/software. Such a system would be compatible with other automation efforts in civilian weather services and other C-cubed efforts in the DOD. The advantage of spatially and temporally detailed weather information in marginal and adverse situations was documented. Sensor siting considerations were addressed in relation to specific weather elements and observational requirements. The contributions of automated met watch procedures and short-range guidance forecasts of RVR landing minima were demonstrated. Feedback on system performance and acceptability was obtained from cognizant AWS offices.
Slant And Runway Visual Range Relationships
DOWNLOAD
Author : William Lewis
language : en
Publisher:
Release Date : 1977
Slant And Runway Visual Range Relationships written by William Lewis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with categories.
A study was conducted to determine if any significant relationships existed between horizontal and slant visibility during fog conditions. Approximately 11,000 sets of atmospheric transmittance observations in fog were obtained at six horizontal levels from 5 to 155 feet and from the 5- to 155-foot slant path by extinction-type transmissometers mounted on two airfield towers separated by 250 feet. Each observation set was classified into one of seven vertical profile classes according to the transmittance difference between the top (155-foot) and bottom (5-foot) transmissometers. The implications of the various fog structures for aircraft landings are discussed. Average 5- to 155-foot slant visual range versus 5-foot runway visual range (SVR-RVR) ratios and standard deviations of ratios were computed by profile class. An analysis showed that results are definitive and could form the basis of a procedure for estimating SVR from RVR through fog profile measurement. A multiple linear regression analysis to predict SVR from RVR, surface temperature, windspeed, and atmospheric stability showed RVR to be the best predictor of SVR, while the other variables showed some effect only with dense fog. These results are considered tentative, since they are based on a limited data sample. Fifteen-minute changes in SVR by profile class were examined for certain SVR ranges. Results showed that knowledge of the profile class would not significantly improve 15-minute persistence forecasts of SVR. (Author).
Comparison Of Slant And Runway Visual Range Relationships For 100 124 And 155 Feet
DOWNLOAD
Author : William Lewis
language : en
Publisher:
Release Date : 1978
Comparison Of Slant And Runway Visual Range Relationships For 100 124 And 155 Feet written by William Lewis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Meteorology in aeronautics categories.
Ratios of slant visual range measured from heights of 100, 124, and 155 feet to horizontal visual range measured at 15 feet were computed for low-visibility regimes. These ratios were found to be related to the linear fog density profile expressed as the difference in horizontal atmospheric transmittance between the top (100-, 124-, and 155-foot) and bottom (15-foot) levels. It was determined that useful estimates of slant visual range could be provided through these relationships. The predictions would be most accurate when the visibility decreased with height (most common fog structure). A slight increase in accuracy would also be expected with decreasing slant height.
Meteorological And Geoastrophysical Abstracts
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 1986
Meteorological And Geoastrophysical Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Atmospheric chemistry categories.