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1、ProgressinPhysicalGeography27,2(2003)pp.275–283Remotesensing:basemappingPaulAplinSchoolofGeography,TheUniversityofNottingham,UniversityPark,NottinghamNG72RD,UKIIntroductionMuchgeographicalanalysisisunderpinnedbytheneedforbasemaps.Basemappingisanobvious,butoftenneglected,functionofrem
2、otesensing.Recentdevelopmentsmeanthatremotesensingisinastrongerpositionthanevertocontributetothebasemappingneedsofthegeographicalcommunity.Therefore,thispaperbeginsbyexaminingtherôleremotesensinghastoplayinthisarea.Particularattentionispaidtotheincreasingavailabilityanduseoffinespati
3、alresolutionsatellitesensorimageryandthedatarequirementsofgeographicalinformationsystems(GIS).Thisisfollowedbyabroaderdiscussiononthevariousmappingapplicationsofremotesensingand,finally,abriefsummaryofgeneraldevelopmentsinthefield.IIFinespatialresolutionsatellitesensorsCommonly,thete
4、rm‘basemap’isusedtorefertoastandardmapproductgeneratedbyamappingagency.Thisdefinitionseemssomewhatrestricted,though,soabasemapisdefinedhereasacorespatialdatasetprovidingafoundationforspatialinvestiga-tion.Traditionally,basemapshavebeenproducedfromaerialphotographsusingpho-togrammetri
5、ctechniques(HollandandAllan,2001;TengandFairbairn,2002).Aerialphotographsarewellsuitedforthispurposebecauseoftheirrelativelyfinespatialdetail.Whilesuchtraditionalproceduresremaincommonplace,alternativedatasourcesarenowalsobeingadoptedforbasemapping.Inparticular,satellitesensorimagery
6、hasbeentestedforthispurpose(Araietal.,2001).Themainfactordrivingthistrendistheemergenceoffinespatialresolutionsatellitesensors.InSeptember1999,the(nowwell-known)IKONOSsatellitesensorwaslaunched,providing1mspatialresolutionpanchromaticimageryand4mspatialresolutionmultispectralimagery(
7、Jiaoetal.,2001).Theimplicationsforbasemappingareclear:thislevelofspatialdetailissufficienttoenabletheproductionofrelativelyaccuratebasemaps(Li,2000;HanleyandFraser,2001).©Arnold200310.1191/0309133303pp381pr276Remotesensing:basemappingThelaunchofIKONOSwasanimportantlandmarkforremotese
8、nsingsinceth
