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Evaluation Of Automated Imagery Analysis Algorithms For Use In The Three Dimensional Nephanalysis Model At Afgwc
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Book Synopsis Evaluation of Automated Imagery Analysis Algorithms for Use in the Three-dimensional Nephanalysis Model at AFGWC by : Robert Paul D'Entremont
Download or read book Evaluation of Automated Imagery Analysis Algorithms for Use in the Three-dimensional Nephanalysis Model at AFGWC written by Robert Paul D'Entremont and published by . This book was released on 1982 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two different imagery analysis algorithms, one of which is currently in use by the 3DNEPH automated cloud analysis program at the Air Force Global Weather Central (AFGWC), and the other developed at AFGL, were evaluated and compared on a sample set of DMSP IR data (10.2 to 12.8 micrometers) with the aid of the AFGL Man-computer Interactive Data Access System. The 3DNEPH algorithm, MODAL, and the AFGL algorithm, CLUSTER, were designed to separate cloud layers in IR satellite imagery. Such information is used by the 3DNEPH to compute cloud analysis parameters as percent cloud (earth) coverage and cloud heights. Both algorithms were found to perform well under some meteorological circumstances, but not so well under others. In general, however, it was found that CLUSTER performs better. The CLUSTER algorithm found clear/cloud boundaries, numbers of cloud layers, and fractional cloud covers that are closer to estimates made by analysts looking at corresponding IR and visible images. The MODAL algorithm found more cloud layers than were observed, and tended to overanalyze the transition regions between cloud layers. The AFGWC has recognized the limitations of MODAL and the complications in its computer code. Subsequently, a substantially revised version of the 3DNEPH has been written, and is known as the Real-Time Nephanalysis (RTNEPH).
Book Synopsis Evaluation of Automated Imagery Analysis Algorithms for Use in the Three-dimensional Nephanalysis Model at AFGWC by : Robert Paul D'Entremont
Download or read book Evaluation of Automated Imagery Analysis Algorithms for Use in the Three-dimensional Nephanalysis Model at AFGWC written by Robert Paul D'Entremont and published by . This book was released on 1982 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A New NASA/MSFC Mission Analysis Global Cloud Cover Data Base by : S. C. Brown
Download or read book A New NASA/MSFC Mission Analysis Global Cloud Cover Data Base written by S. C. Brown and published by . This book was released on 1985 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: A global cloud cover data set, derived from the USAF 3D NEPH Analysis, was developed for use in climate studies and for Earth viewing applications. This data set contains a single parameter - total sky cover - separated in time by 3 or 6 hour intervals and in space by approximately 50 nautical.miles. Cloud cover amount is recorded for each grid point (of a square grid) by a single alphanumeric character representing each 5 percent increment of sky cover. The data are arranged in both quarterly and monthly formats. The data base currently provides daily, 3-hr observed total sky cover for the Northern Hemisphere from 1972 through 1977 less 1976. For the Southern Hemisphere, there are data at 6-hr intervals for 1976 through 1978 and at 3-hr intervals for 1979 and 1980. More years of data are being added. To validate the data base, the percent frequency of or = 0.3 and or = 0.8 cloud cover was compared with ground observed cloud amounts at several locations with generally good agreement. Mean or other desired cloud amounts can be calculated for any time period and any size area from a single grid point to a hemisphere. The data base is especially useful in evaluating the consequence of cloud cover on Earth viewing space missions. The temporal and spatial frequency of the data allow simulations that closely approximate any projected viewing mission. No adjustments are required to account for cloud continuity.
Download or read book NASA Technical Paper written by and published by . This book was released on 1985 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1988 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis An Outline for the RTNEPH Infrared Atmospheric Water Vapor Attenuation Study by : Robert Paul D'Entremont
Download or read book An Outline for the RTNEPH Infrared Atmospheric Water Vapor Attenuation Study written by Robert Paul D'Entremont and published by . This book was released on 1989 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Real-Time Nephanalysis (RTNE PH) generates real-time global analysis of cloud extent, base, height, and type. The RTNE PH makes extensive use of satellite data that are measured in the 10-12 micron infrared (IR) window for thermal mapping of clouds and the earth's surface both day and night. Water vapor absorption effects are significant in such data, especially for high viewing angles and tropical atmospheres where water vapor concentrations are generally high. Water vapor attenuates the emitted ground radiance, reducing its magnitude and with it the apparent temperature of the surface being viewed. Currently, the RTNEPH takes into account such attenuation losses using lookup tables that are functions of viewing geometry, time of day, type of background, and the like. However, these corrections have limited value and leave room for significant improvement. This report outlines and presents two new techniques that are expected to enhance the attenuation correction capabilities of the RTNEPH, multivariate polynomial regression (the Weinreb technique) and the correlated K method.
Author :Assessment and Information Services Center (U.S.). Library and Information Services Division Publisher : ISBN 13 : Total Pages :606 pages Book Rating :4.3/5 ( download)
Book Synopsis Accessions List by : Assessment and Information Services Center (U.S.). Library and Information Services Division
Download or read book Accessions List written by Assessment and Information Services Center (U.S.). Library and Information Services Division and published by . This book was released on 1983 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Meteorological and Geoastrophysical Abstracts by :
Download or read book Meteorological and Geoastrophysical Abstracts written by and published by . This book was released on 1984 with total page 938 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Terrestrial Environment (climatic) Criteria Guidelines for Use in Aerospace Vehicle Development, 1993 Revision by : David L. Johnson
Download or read book Terrestrial Environment (climatic) Criteria Guidelines for Use in Aerospace Vehicle Development, 1993 Revision written by David L. Johnson and published by . This book was released on 1993 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1983 with total page 1384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1993 with total page 1692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Interference Problems on Wing-fuselage Combinations in Inviscid, Incompressible Flow by : Aeronautical Research Council (Great Britain)
Download or read book Interference Problems on Wing-fuselage Combinations in Inviscid, Incompressible Flow written by Aeronautical Research Council (Great Britain) and published by . This book was released on 1974 with total page 1212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index: Keyword A-L by :
Download or read book Government Reports Annual Index: Keyword A-L written by and published by . This book was released on 1983 with total page 1216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1995 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Current Programs written by and published by . This book was released on 1975 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Ahmad Osman Publisher :Sudwestdeutscher Verlag Fur Hochschulschriften AG ISBN 13 :9783838137599 Total Pages :188 pages Book Rating :4.1/5 (375 download)
Book Synopsis Automated Evaluation of Three Dimensional Ultrasonic Datasets by : Ahmad Osman
Download or read book Automated Evaluation of Three Dimensional Ultrasonic Datasets written by Ahmad Osman and published by Sudwestdeutscher Verlag Fur Hochschulschriften AG. This book was released on 2014-05-13 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: The application of Carbon Fibers Reinforced Polymers composites has remarkably increased over the late years especially in the aeronautical and automotive fields as well as in the civil infrastructures. The quality of the manufactured composites structures is subjected to very high requirements in order to ensure that the structure performs satisfactorily. The major non-destructive testing technique to inspect the quality of these components is the ultrasound modality. Manual ultrasonic testing has often provided a solution for conventional small scale inspection tasks. However, manual testing and evaluation of the scanning results are no more acceptable as a solution for inspecting large composite components. Nowadays, a rapid acquisition of ultrasound data over large structures is possible by using automated acquisition systems which often integrate the phased array technique. Still, a rapid acquisition is only a part of the solution for an automated NDT testing. The second issue which has to be solved is the analysis of the enormous amount of the generated data. This work proposes an approach that provides a solution for the data evaluation issue.
Book Synopsis Variational and Level Set Methods in Image Segmentation by : Amar Mitiche
Download or read book Variational and Level Set Methods in Image Segmentation written by Amar Mitiche and published by Springer. This book was released on 2012-12-05 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: Image segmentation consists of dividing an image domain into disjoint regions according to a characterization of the image within or in-between the regions. Therefore, segmenting an image is to divide its domain into relevant components. The efficient solution of the key problems in image segmentation promises to enable a rich array of useful applications. The current major application areas include robotics, medical image analysis, remote sensing, scene understanding, and image database retrieval. The subject of this book is image segmentation by variational methods with a focus on formulations which use closed regular plane curves to define the segmentation regions and on a level set implementation of the corresponding active curve evolution algorithms. Each method is developed from an objective functional which embeds constraints on both the image domain partition of the segmentation and the image data within or in-between the partition regions. The necessary conditions to optimize the objective functional are then derived and solved numerically. The book covers, within the active curve and level set formalism, the basic two-region segmentation methods, multiregion extensions, region merging, image modeling, and motion based segmentation. To treat various important classes of images, modeling investigates several parametric distributions such as the Gaussian, Gamma, Weibull, and Wishart. It also investigates non-parametric models. In motion segmentation, both optical flow and the movement of real three-dimensional objects are studied.
