arcgis期末复习考点第十三章.doc

《arcgis期末复习考点第十三章.doc》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、Chapter13ReviewQuestions1.Howcanananalysismasksavetimeandeffortforrasterdataoperations?Becauseananalysismasklimitsdataanalysistocellsthatdonotcarrythecellvalueof“nodata,”itcansavetimeandeffortforrasterdataoperations.2.Whyisalocaloperationalsocalledacell-by-celloperation?Alocaloperationisals

2、ocalledacell-by-celloperationbecauseitcomputesthecellvaluesintheoutputraster,onecellatatime.3.RefertoFigure13.3.Showtheoutputrasterifthelocaloperationusestheminimumstatistic.4.RefertoFigure13.4.Showtheoutputrasterifthelocaloperationusesthevarietystatistic.5.Figure13.5chastwocellswiththesame

3、valueof4.Why?Figure13.5chastwocellswiththesamevalueof4becausetheybothhavethecombinationof(1,2).6.Neighborhoodoperationsarealsocalledfocaloperations.Whatisthefocalcell?Thefocalcellisthecentercelloftheneighborhood.7.Describethecommontypesofneighborhoodsusedintheneighborhoodoperation.Commontyp

4、esofneighborhoodsincluderectangles,circles,annuluses,andwedges.Arectangleisdefinedbyitswidthandheightincells,withthefocalcellatthecenter.Acircleextendsfromthefocalcellwithaspecifiedradius.Anannulusordoughnut-shapedneighborhoodconsistsoftheringareabetweenasmallercircleandalargercirclecentere

5、datthefocalcell.Andawedgeconsistsofapieceofacirclecenteredatthefocalcell.8.RefertoFigure13.8.Showtheoutputrasteriftheneighborhoodoperationusesthevarietymeasure.9.RefertoFigure13.9.Showtheoutputrasteriftheneighborhoodoperationusestheminoritystatistic.10.Whatkindsofgeometricmeasurescanbederiv

6、edfromthezonaloperationsonasingleraster?Givenasingleinputraster,zonaloperationsmeasurethegeometryofeachzone,suchasitsarea,perimeter,thickness,andcentroid.11.Azonaloperationwithtworastersmustfirstdefineoneofthemasthezonalraster.Whatisazonalraster?Azonalrastercontainszones,whicharegroupsofcel

7、lsofsamevaluesorlikefeatures.Zonesmaybecontiguousornoncontiguous.12.RefertoFigure13.11.Showtheoutputrasterifthezonaloperationusestherangestatistic.13.Supposeyouareaskedtoproducearasterthatshowstheaverageprecipitationineachmajorwatershedinyourstate.Descri