DMSP OLS - Operational Linescan SystemEntry ID: gov.noaa.ngdc.G01119
Abstract: ABSTRACT: Visible and infrared imagery from DMSP Operational Linescan System (OLS) instruments are used to monitor the global distribution of clouds and cloud top temperatures twice each day. The archive data set consists of low resolution global and high resolution regional, imagery recorded along a 3,000 km scan, satellite ephemeris and solar and lunar information. Infrared pixel values ... correspond to a temperature range of 190 to 310 Kelvins in 256 equally spaced steps. Onboard calibration is performed during each scan. Visible pixels are relative values ranging from 0 to 63 rather than absolute values in Watts per m^2. Instrumental gain levels are adjusted to maintain constant cloud reference values under varying conditions of solar and lunar illumination. Telescope pixel values are replaced by Photo Multiplier Tube (PMT) values at night. A telescope pixel is 0.55 km at high resolution (fine mode) and 2.7 km at low resolution(smooth mode). Low resolution values are the mean of the appropriate 25 high resolution values.
SUPPLEMENTAL INFORMATION: NGDC currently receives 8.5 Gb of data from AFWA over a designated T1 line. OLS data has been processed and quality controlled within since the end of March 1994. A low resolution scan line consists of 1,465 visible pixels, 1,465 IR pixels, satellite ephemeris, a quality assessment and other satellite and astronomical parameters. A high resolution scan line contains 7,325 pixels amd the same supporting information.
CURRENTNESS REFERENCE: Ground Condition
Purpose: PURPOSE: Earth and Near-Earth Environment Research
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Data Set Citation
Dataset Originator/Creator: DOD/USAF/AFWA > Air Force Weather Agency, U.S. Air Force, U.S. Department of DefenseDOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce (comp)
Dataset Title: DMSP OLS - Operational Linescan System
Dataset Release Date: 1992
Dataset Release Place: Boulder, CO
Dataset Publisher: National Geophysical Data CenterOnline Resource: http://dmsp.ngdc.noaa.gov/dmsp.html
Start Date: 1975-04-01
ATMOSPHERE > ATMOSPHERIC TEMPERATURE
ATMOSPHERE > ATMOSPHERIC WATER VAPOR > WATER VAPOR
ATMOSPHERE > CLOUDS
ATMOSPHERE > PRECIPITATION
TERRESTRIAL HYDROSPHERE > SNOW/ICE
TERRESTRIAL HYDROSPHERE > SURFACE WATER > LAKES
TERRESTRIAL HYDROSPHERE > SURFACE WATER > RIVERS/STREAMS
OCEANS > OCEAN WINDS
OCEANS > SEA ICE
SPECTRAL/ENGINEERING > INFRARED WAVELENGTHS
SPECTRAL/ENGINEERING > MICROWAVE > BRIGHTNESS TEMPERATURE
SPECTRAL/ENGINEERING > MICROWAVE
SPECTRAL/ENGINEERING > VISIBLE WAVELENGTHS
SUN-EARTH INTERACTIONS > SOLAR ENERGETIC PARTICLE FLUX > ELECTRON FLUX
SUN-EARTH INTERACTIONS > SOLAR ENERGETIC PARTICLE PROPERTIES > PARTICLE DENSITY
SUN-EARTH INTERACTIONS > SOLAR ENERGETIC PARTICLE PROPERTIES > PARTICLE SPEED
SUN-EARTH INTERACTIONS > SOLAR ENERGETIC PARTICLE PROPERTIES > PARTICLE TEMPERATURE
SUN-EARTH INTERACTIONS > SOLAR ENERGETIC PARTICLE FLUX > PROTON FLUX
BIOSPHERE > ECOLOGICAL DYNAMICS > FIRE ECOLOGY > FIRE OCCURRENCE
ISO Topic Category
Quality LOGICAL CONSISTENCY REPORT: Unknown
COMPLETENESS REPORT: Unknown
PROCESS DESCRIPTION: OLS data are decompressed, reordered, restructured and deinterleaved. Satellite ephemeris are computed using a four body orbital mechanics program with observed, rather than predicted, orbital elements used as input. Missing scan lines are correctly ... positioned. Quality assessments are made of each pixel and characterized for the each complete scan line.
SOURCE USED CITATION ABBREVIATION: RDR
PROCESS DATE: Unknown
SOURCE PRODUCED CITATION ABBREVIATION: OLS
ORIGINATOR: DOD/USAF/AFWA > Air Force Weather Agency, U.S. Air Force, U.S. Department of Defense .
TITLE: DMSP Raw Data Records (RDR) . Unknown .
TYPE OF SOURCE MEDIA: digital database file .
SOURCE TIME PERIOD OF CONTENT/BEGINNING TIME: 1992 .
SOURCE TIME PERIOD OF CONTENT/ENDING TIME: Present .
SOURCE CURRENTNESS REFERENCE: publication date .
SOURCE CITATION ABBREVIATION: RDR .
SOURCE CONTRIBUTION: DMSP Raw Data Files
Access Constraints ACCESS CONSTRAINTS: No Constraints
DISTRIBUTION LIABILITY: While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
CUSTOM ORDER PROCESS: Contact Data Center
Use Constraints None
Data Set Progress
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Phone: (303) 497-6133
Fax: (303) 497-6513
Email: Edward.H.Erwin at noaa.gov
NOAA/NESDIS/NGDC E/GC2 325 Broadway
Province or State: CO
Postal Code: 80303
Creation and Review Dates
DIF Creation Date: 2009-06-15
Last DIF Revision Date: 2011-03-10