Mapping Processing

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1、MAPPINGPROCESSINGKentLamLSGI532Whattotalkabout•DesignPrinciples•Natureofdata•Classificationmethods•Whentousewhichclassificationmethod?DesignPrinciplesValuemapping–analytical(1)1.Definethethemeforthemapandtheaudiences1.Publicoraselectedgroupofpeople2.Identifythepublishedmedi

2、a1.Papermapvselectronic(computerscreen)3.Decideon#ofthemesonmap1.Singleortwo4.Decideonthetypesofmap:point,line,areaorcombine5.Identifytheenumerationunits1.Administrativeboundariesor2.Areaswheredataarehomogenouscollected3.BoundarieswhicharethematicallysignificantValuemapping

3、–analytical(2)6.Processthevalueswithintheboundaries1.Definethevaluedefinition2.grouping,averagingoftherawdatatoform“values”3.Datashouldconstitutetheentireregion7.Defineclasses1.Delineatetheclassboundaries2.Optimizethe#ofclasses8.Mappingofvaluestoclasses1.Assignfinalvaluesto

4、theareasMapFormation–e.gareamap1.Defineareasymboldefinitionandcolourscheme1.Selectcolourschemeor“hue,valuesandsaturation”2.Patternsortinting3.Observethedistributionandlegibility2.Placementofothertopographicfeaturesandlabels1.Otherlevelsofboundaries2.TopographicandHydrograph

5、icfeatures,e.g.rivers3.Culturalfeatures,e.g.city4.Textlabels–nottodistractthereaders3.Legend1.Placementofthelegend2.Placementofappropriatetitle3.Placementofotheressentialelementssuchasscalebar,grid,etc.TypesofStatisticalMapNeighourhoodStatistics,byDepartmentforCommunitiesan

6、dLocalGovernmentDiscrete/DiscontinuousPhenomenaToshowquantityatpoints/smallareas•proportionalsymbols•flowmapsToshowquantityforareas•dotmaps•choroplethmaps•dasymetricmapsPitfallsinStatisticalMapping•Exaggeration•Differenceexaggeratedby,e.g.colourcontrast•Misleading•Different

7、geographicareasvarygreatlyinbothsizeandpopulation•Donotmapvaluesbutusingstandardizeddatasuchasratesorpercentages•Largeareadominated•Largegeographicareatendstodominatesmallareas,inparticular,adominantcolourisbeingusedbylargearea•Inappropriateuseofenumerationboundary•Dominant

8、patternmaybelostifinappropriateboundaryunitsareused•Softwaresuggestion•Dataclassif