10/11/2023 0 Comments Odf lightning trackerHence to denote the data came from the electronic stored image, the word Digital was added to the data set name. A neural network and pattern recognition algorithm was used to automatically extracts the lightning discharge time and location from the data. The OLS Digital Derived Lightning From DMSP F10 (START DATE: STOP DATE: ) and OLS Digital Derived Lightning From DMSP F12 (START DATE: STOP DATE: ) were derived from OLS electronic images. #Odf lightning tracker archiveIn spite of the significant limitations and the lack of alternative sources of global lightning data, the DMSP film archive represents the most comprehensive global lightning data set in existence for this time period. There are numerous gaps in the nighttime imagery including a period form July 1980 to January 1984. Unfortunately, the visible-band imagery are not uniformly available nor of uniform quality. The hard-copy positive transparency film strips date back to 1973 and have been manually sorted for lightning signatures which are geolocated with date and time. Hence to denote the data was derived from film strips, the word Analog was included in the data set name. OLS Analog Derived Lightning data (START DATE: STOP DATE: ) are derived from thousands of hard-copy positive transparency film strips DMSP visible (0.4 - 1.1 um) imagery archived at the NSIDC. Initial tapes were prepared on an experimental basis until routine operations begin in February 1994. #Odf lightning tracker fullOn March 9, 1992, the full DMSP digital data stream started to be sent to NGDC. The National Snow and Ice Data Center (NSIDC) has maintained the archives of analog OLS data since 1979. At NGDC, OLS data are decompressed, reordered, restructured and De-interleaved. Currently, high resolution and low resolution data files are written to 8 mm tape which are sent to National Geophysical Data Center (NGDC) on a daily basis. Air Force began to taper off as they transitioned to a digital data handling system. Beginning in summer of 1991, the production of hard-copy by the U.S. The visible-band (0.4 to 1.1 micrometer) data from 1973 through 1991 are in the form of hard-copy positive transparency images. The Scanning Radiometer on DMSP-5B-F3 and the Operational Line Scanner (OLS) on DMSP-5D-1/F1, 5D-2/F7, 5D-2/F8, 5D-2/F9, 5D-2/F10, and 5D-2/F12 recorded high-resolution images in the visible wavelength range. #Odf lightning tracker seriesAir Force Defense Meteorological Satellite Program (DMSP) series has provided one of the longest running nighttime global lightning data set. The derived lightning data are observations at local midnight, since the system was only capable of detecting lightning during night. The structure of the data files, instructions for accessing the HDF library, description of read software, and pertinent scientific references are included in this README. This README file contains information for three data sets: 1) OLS Analog Derived Lightning 2) OLS Digital Derived Lightning From DMSP F10 and 3) OLS Digital Derived Lightning From DMSP F12. OLS Derived Lightning HDF Data File Structure Operational Line Scan (OLS) Derived Lightning Data Sets
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