陸地衛(wèi)星系列---

Landsat

1ppt課件Characteristic

LaunchedbyDateoflaunchDateofterminationAltitudeSensorRecurrentperiodLANDSAT-1NASA1972.7.231978.1.6915kmRBV/MSS18daysLANDSAT-2NASA1975.1.221982.2.25915kmRBV/MSS18daysLANDSAT-3NASA1978.3.51983.3.31915kmRBV/MSS18daysLANDSAT-4NASA1982.7.162001.6.15705kmMSS/TM16daysLANDSAT-5NASA1984.3.1Operating*1705kmMSS/TM16daysLANDSAT-6NASA1993.10.51993.10.5-ETM16daysLANDSAT-7NASA1999.4.15Operating*2705kmETM+16days*1:ThedatareceptionbyNASDAwasfinishedtoJun30,2001.

*2:ThedatareceptionbyNASDAwasfinishedtoNov30,2002.\2ppt課件Overview

LANDSAT-1istheworldfirstearthobservationsatellitelaunchedbytheUnitedStatesin1972andamemorablesatellitewhichhasbeenrecognizedinavailabilitybeingcapableofobservingtheearthfarfromspace.Itsexcellentobservationabilitybroughtabouttheimportanceofstate-of-the-artremotesensing.FollowingLANDSAT-1,LANDSAT-2,3,4,5and7werelaunched,andcurrentlyLANDSAT-7isoperatedasamainsatellite.LANDSAT-5isequippedwithMultispectralScanner(MSS)andThematicMapper(TM).MSSisanopticalsensortoobservethereflectedsolarradiationfromtheearthsurfaceinfourdifferentspectralbandsbyacombinationoftheopticalsystemandthesensor.TMisamoreadvancedversionofobservationequipmentthanMSS,whichobservestheearth'ssurfacein7spectralbandsrangingfromvisibletothermalinfraredregions.LANDSAT-7isequippedwithEnhancedThematicMapperPlus(ETM+),thesuccessorofTM.TheobservationbandsarebasicallysamesevenbandsasTMandthenewlyaddedband8witha15mofhighresolution.3ppt課件

WavelengthVisible:2bands

Near-infrared:2bandsSpatialResolution83mSwathWidth185km4ppt課件

WavelengthVisible:3bands

Near-infraredandMiddle-infrared:3bands

Thermal-infrared:1bandSpatialResolutionVisible,Near-infraredandMiddle-infrared:30m

Thermal-infrared:120mSwathWidthAbout180km5ppt課件Overview

TheETM+isanimprovedversionoftheLandsat4/5ThematicMapper(TM)payloads,butstillprovidesdatacontinuitywithallpriorLandsatmissions.ImprovementsintheinstrumentincludeincreasedspatialresolutionofthethermalIRband(Band6),improvementoftheradiometriccalibrationequipment,andtheadditionofapanchromaticband(Band8).BelowisasimplifieddiagramoftheETM+.

6ppt課件Characteristic

BandwavelengthbandResolution10.45-0.52mm30m20.52-0.60mm30m30.63-0.69mm30m40.76-0.90mm30m51.55-1.75mm30m610.4-12.5mm60m72.08-2.35mm30m80.50-0.90mm15m7ppt課件OrbitsofEarthObservationSatellites

Theorbitisthepathtakenbytheartificialsatellitesincludingearthobservationsatelliteswhentheyflyaroundtheearth.Thereareseveraltypesoforbits,andtheorbitisselecteddependingonpurposesofthesatellites.Earthobservationsatelliteshaveamajormissiontoobservetheentireearth,sotheycirclethemostsuitableSun-synchronoussub-recurrentorbit.Sun-synchronoussub-recurrentorbit

Sun-synchronoussub-recurrentorbitisacombinationofsun-synchronousorbitandsub-recurrentorbit.

8ppt課件Withsun-synchronousorbit

Withsun-synchronousorbit,positioningbetweenthesatelliteandthesunisalwaysthesame,whichmeanstheareathesatellitefliesoveralwaysgetssamesunlightangle.Withthisorbit,theincidenceangle（入射角）ofsunlighttothelandsurfaceisalwaysthesame,anditallowstoobserveradiationandreflectionfromthelandsurfaceaccurately.

Asub-recurrentorbit

Asub-recurrentorbitmeansthatafteracertainnumberofdays,thesatelliterepeatsitsoriginalorbit.Thisorbitenablesthesatellitetoobservethesameareaatregularintervals.9ppt課件

Sun-synchronousorbit

Sub-recurrentorbit10ppt課件

SunSynchronousOrbitofLandsat7

SunElevationAngle

11ppt課件Satellitesandobits12ppt課件13ppt課件陸地衛(wèi)星系列---SPOT衛(wèi)星14ppt課件86878889909192939495969798992000010203040506070809

SPOT5

SPOT4衛(wèi)星運(yùn)行服務(wù)中斷發(fā)射日或重新開始服務(wù)日

SPOT1

SPOT2SPOT3

15ppt課件Overview

TheFrenchearthobservationsatellitesSPOT-1,2,3and4werelaunchedintoasun-synchronoussub-recurrentorbitatanaltitudeofabout822kmin1986,1990,1993and1998respectively.SPOTcanobservenotonlytheearth'ssurfacejustunderneaththesatellitebutalsoslantwisetothesatellite'spathbychangingthescandirectionofthesensors.Itcanshortenthetimeperiodforobservingaspecifiedarearepetitively.SPOT-1,-2and-3areequippedwithCCDsensorscalledHighResolutionVisibleImagingSystem(HRV).SPOT-4isequippedwithtwoCCDsensors,HRV'ssuccessor,HighResolutionVisibleandInfrared(HRVIR)andVegetation(VGT)*1.TheobservationbandsofHRVIRarebasicallysameasHRVandthenewlyaddedband4,shortwaveinfrared(SWIR:1.58to1.75mm).VGTobserveswideareawithaswathof2,250km.

16ppt課件ObservationBandVisible:2bands

Near-infrared:1band

Panchromatic-Band:1bandSpatialResolutionMultispectoral-Band:20m

Panchromatic-Band:10mSwathWidthAbout60km17ppt課件

HRVIRScanningImage

18ppt課件19ppt課件

Spot立體像對(duì)

軌道旁向傾斜，像對(duì)最短時(shí)間差為0.5小時(shí)自動(dòng)相關(guān)生成DEM，高程精度為7-11米(VirtuoZo)20ppt課件

SPOT的傾斜觀測(cè)功能重復(fù)觀測(cè)能力單星：2－3天/次，多星：1天/次21ppt課件20°20°600KmmaxiHRS120Km立體成像裝置HRS22ppt課件Spot-5基本產(chǎn)品10米多光譜5米全色2.5米全色23ppt課件+Spot-5增值產(chǎn)品

10米多光譜5米Pan24ppt課件Spot5同軌立體像對(duì)Spot5HRS立體像對(duì)生成的10米高程精度DEM25ppt課件二、陸地衛(wèi)星系列---IKONOSIKONOS:1米全色4米多光譜1米全色-銳化軌道:680km,太陽(yáng)同步,98.2o傾斜26ppt課件

IKONOS光譜波段紅波段.63-.69microns(4m)近紅外.76-.90microns(4m)藍(lán)波段.45-.52microns(4m)綠波段.52-.60microns(4m)全色.45-.90微米的圖像(1m）27ppt課件Overviewof

IKONOSSinceitslaunchinSeptember1999,SpaceImaging'sIKONOSearthimagingsatellitehasprovidedareliablestreamofimagedatathathasbecomethestandardforcommercialhigh-resolutionsatellitedataproducts.TheIKONOSsatelliteistheworld'sfirstcommercialsatellite

tocollectblack-and-whiteimageswith1-meterresolutionandmultispectralimagerywith4-meterresolution.SensorCharacteristics

TheIKONOSsatelliteweighsabout1600pounds.ItorbitstheEarthevery98minutesatanaltitudeofapproximately680kilometersor423miles.IKONOSwaslaunchedintoasun-synchronousorbit,passingagivenlongitudeataboutthesamelocaltime(10:30A.M.)daily.IKONOScanproduce1-meterimageryofthesamegeographyevery3days.SpectralRange

1-meterblack-and-white(panchromatic)

0.45-0.90mm.4-metermultispectral

Blue:0.45-0.52mm

Green:0.51-0.60mm

Red:0.63-0.70mm

NearIR:0.76-0.85mm28ppt課件Thisone-meterresolutionsatelliteimageofManhattan,NewYorkwascollectedat11:43a.m.EDTonSept.12,2001bySpaceImaging