陆地卫星--英文版上课讲义.ppt

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1、陆地卫星--英文版OverviewLANDSAT-1istheworldfirstearthobservationsatellitelaunchedbytheUnitedStatesin1972andamemorablesatellitewhichhasbeenrecognizedinavailabilitybeingcapableofobservingtheearthfarfromspace.Itsexcellentobservationabilitybroughtabouttheimportanceofstate-of-the-artremotesens

2、ing.FollowingLANDSAT-1,LANDSAT-2,3,4,5and7werelaunched,andcurrentlyLANDSAT-7isoperatedasamainsatellite.LANDSAT-5isequippedwithMultispectralScanner(MSS)andThematicMapper(TM).MSSisanopticalsensortoobservethereflectedsolarradiationfromtheearthsurfaceinfourdifferentspectralbandsbyacomb

3、inationoftheopticalsystemandthesensor.TMisamoreadvancedversionofobservationequipmentthanMSS,whichobservestheearth'ssurfacein7spectralbandsrangingfromvisibletothermalinfraredregions.LANDSAT-7isequippedwithEnhancedThematicMapperPlus(ETM+),thesuccessorofTM.Theobservationbandsarebasica

4、llysamesevenbandsasTMandthenewlyaddedband8witha15mofhighresolution.WavelengthVisible:2bandsNear-infrared:2bandsSpatialResolution83mSwathWidth185kmWavelengthVisible:3bandsNear-infraredandMiddle-infrared:3bandsThermal-infrared:1bandSpatialResolutionVisible,Near-infraredandMiddle-i

5、nfrared:30mThermal-infrared:120mSwathWidthAbout180kmOverviewTheETM+isanimprovedversionoftheLandsat4/5ThematicMapper(TM)payloads,butstillprovidesdatacontinuitywithallpriorLandsatmissions.ImprovementsintheinstrumentincludeincreasedspatialresolutionofthethermalIRband(Band6),improveme

6、ntoftheradiometriccalibrationequipment,andtheadditionofapanchromaticband(Band8).BelowisasimplifieddiagramoftheETM+.CharacteristicBandwavelengthbandResolution10.45-0.52mm30m20.52-0.60mm30m30.63-0.69mm30m40.76-0.90mm30m51.55-1.75mm30m610.4-12.5mm60m72.08-2.35mm30m80.50-0.90mm15mOrbit

7、sofEarthObservationSatellitesTheorbitisthepathtakenbytheartificialsatellitesincludingearthobservationsatelliteswhentheyflyaroundtheearth.Thereareseveraltypesoforbits,andtheorbitisselecteddependingonpurposesofthesatellites.Earthobservationsatelliteshaveamajormissiontoobservetheentir

8、eearth,sotheycirclethemost