[Hyperspectral image data analysis]

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1、uringthe1950s,thedig-italcomputerbegantoemergeasanindispens-Dabletoolfordealingwithdata.Itwasnotlonginthispe-riodbeforepatternrecognitiontech-nology,theabilitytodiscriminatebetweendifferentpatternsofnum-bers,begansignificantdevelopment.Thenin1957,Sputnik,theworld’sfirsta

2、rtificialsatellite,waslaunched,thusbeginningthespaceage.Itwastheconcurrenceofthesethreedevel-opments,thepossibilityofspacecraft,patternrecognitiontechnology,andthedigitalcomputer,thatstimulatedthoughtintohowonemightmakeobservationsfromspacetoobtainin-formationtobetterman

3、agetheEarth’srenewableandnonrenewableresources.DavidLandgrebeThisquestionbegantobeseri-ouslyaddressedintheearly1960s.©COMSTOCK,INC.1998(Detailsoftheearlyhistoryofspace-basedlandremotesensingaregivenin[1].Thisissueofthisjournalwaswrittenincom-withsuchresolutionwouldbevery

4、expensivetobuildandmemorationofthe25thanniversaryofthelaunchofoperate,butthebigproblemwouldbetheunreasonableLandsat1inJuly,1972.)Earlyworkfocusedonwhatkindvolumeofdatathatwouldbegeneratedtocoverevenaofmeasurementstomakeandhowtoprocessthesemea-county-sizedarea.Spatialreso

5、lutionisoneofthemostex-surements.Thefirstthoughtsquitenaturallyturnedtopensiveparameterstoachieveinaspacesystem.Amoreimageryandtheemergingimageprocessingtechnology;economicalapproachthatdidnotrequiresuchhighspa-however,itwasnotlongbeforethisapproachwasrecog-tialresolutio

6、nwasneeded,asidefromthelimitationthatnizedashavingsubstantiallimitations.Tobeviable,thedataprocessingtechnologyofthatdayandtheforeseeabletechnologyhadtobeeconomical.Thedesiredinforma-futurewouldimpose.tionhadtobecomeavailabletotheuseratminimalcost.Thegreatadvantageofspac

7、e-basedtechnologywastheTheMultispectralConcepteconomyofscale.Largeareascouldbecoveredveryquicklyandatlowperunitcost.But,forexample,toiden-Whatwashitupontosolvethisproblemcametobetifycornanditsconditionbydirectimagemeanswouldknownasthemultispectralapproach.Thefundamentalr

8、equirespatialresolutionoftheorderofcentimeterssobasisforspace-basedremotesensingisthatinformationisthat