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•PerformingSubselects
JoiningTwoorMoreTables
Typically,youstoreyourinformationinseveraldifferenttables.Youhaveyourowndatafiles,and
youmayalsohavevariousdatabasesofstatisticalinformationthatyoupurchasedfromMapInfo
Pro.SQLSelectallowsyoutocreaterelationaljoinssothatyoucanbringinformationfromthese
varioustablestogetherintoasingleresultstable.
Whenyouwanttojointwotables,youmustdeterminewhetheroneofthecolumnsinthefirsttable
containsvaluesthatmatchoneofthecolumnsinthesecondtable.Imaginethatyouhaveatable
ofcountiesthathasdemographicinformation--thepopulationofpeopleinvariousageranges,ethnic
groups,andoccupationalcategoriesineachcounty.Youmayalsohaveadatabasecontaining
informationaboutcustomerorders.Youwanttoexaminethesetwotablesandseeifcertainkinds
oforderscomefromcountieshavingcertaindemographiccharacteristics.Perhapsyouwantto
selectcountiesaccordingtocombinationsofordersanddemographiccharacteristics.Todothis
youhavetobeabletojointhetwotables.
Supposethecountiestablecontainsthenameofthecounty.Similarly,oneofthecolumnsinthe
ordertablecontainsthenameofthecountyinwhichtheorderoriginated.Thus,thesetwotables
haveonefieldincommon,thecountyname.MapInfoProcanusethatcommonfieldtojointhetwo
tables.
County
Customer
Order#
Pop_1990
Pop_1980
CountyName
Foster
Francis
478001
27,135
23,789
Foster
Foster
James
478002
34,846
35,456
Williamette
Mason
Wickwire
478003
151,201
147,101
Mason
CountiesTableOrdersTable
WithintheSQLSelectdialogbox,youusetheWhereConditionfieldtotellMapInfoProhowtojoin
thetwotables.TheSQLSelectdialogboxmightlooklikethis:
Select Columns:
*
From Tables:
Counties, Orders
Where Condition:
Counties.CountyName = Orders.County
Theorderofthetablenames(intheFromTablesfield)isimportant.Ifbothtablescontainmap
objects,theresultstablewillonlyretainthemapobjectsfromthefirsttablelistedintheFromTables
field.Furthermore,whenthequeryiscomplete,MapInfoProautomaticallyselectssomeorallof
therowsfromwhichevertableislistedfirstintheFromTablesfield.Thus,intheprecedingexample,
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MapInfoProwillselectsomeoralloftherowsfromtheCountiestable.Theresultstablewillalso
includedatacopiedfromtheOrderstable,buttheOrderstablewillnotbeselectedperse.
Whenyoujointwotables,thenumberofrowsintheresultstabledependsonhowwellthetwo
tablesmatchup.SupposeyouhaveanOrderstablewith10,000rows,andyoujointheOrderstable
totheStatestable,whichhasfiftyrows.Theresultstablemaycontainasmanyas10,000rows.
However,ifsomeoftherowsintheOrderstablefailtomatchanyoftherowsintheStatestable,
theresultstablewillcontainfewerthan10,000rows.Thus,if400oftherowsintheOrderstabledo
nothaveastatename(perhapsduetodata-entryerrors),andiftherelationaljoinreliesonthestate
name,theresultstablemayonlycontain9,600rows.
YoucanuseUpdateColumntomodifytheresultsofanSQLSelectmulti-tablejoin.Whenyouwant
toupdateacolumninonetablewithinformationfromanothertable,youcan:
1. JointhetableswithSQLSelect.
2. UseUpdateColumnonSelection.Theupdateautomaticallytakeseffectintheappropriatebase
table.
3. Formoreinformation,seePerformingOuterJoinsandUsingtheInstrFunctiontoFindDatain
theHelpSystem.
FindingDuplicateValuesinaColumn
Oftendataisenteredintotablesbymanydifferentusers.Sometimesdataisrepeated,orthereis
commoninformationinseveraldifferentrecords.Thissectionexplainshowtofindallrowsinatable
that,foragivencolumn,shareavaluewithanotherrow.Thisisaccomplishedbyperformingtwo
SQLSelectstatements.
ThefirstSQLSelectstatementproducesaquerytablewithtwocolumns.Thefirstcolumnisalist
ofalluniquevaluesinthedatacolumnandthesecondcolumnliststhenumberoftimesthateach
uniquevalueoccurs.ThesecondSQLstatementcompareseachdatacolumnvaluewithallrows
intheQuerytablewherethecountisgreaterthanone.
Inthenextexample,thereisatableEMPLOYEEthathastwocolumnsId_NumandName.
Tofindtheduplicatevalues,performthetwoSQLSelects,modifyingthemwhereindicated.
1. OntheQuerymenu,clickSQLSelectandfillintheSQLSelectdialogbox.
•SelectColumns:ID_Num,Count(*)
•fromTables:EMPLOYEE
•GroupbyColumns:1
•OrderbyColumns:2 desc
•intoTableNamed:Selection
SubstitutethenameofyourdatacolumnforID_NumandthenameofyourtableforEMPLOYEE.
Thenumber1intheGroupByColumnsboxwillgrouptherowbyID_Num(thefirstcolumn).
The2DescintheOrderbyColumnsboxwillarrangetherecordsindescendingorderbasedon
thevaluesinthecount(*)field(thesecondcolumn).
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ThisSQLSelectstatementreturnsaquerytablewithtwocolumns.Thefirstcolumncontains
everyidentificationnumberpossessedbyatleastoneemployee.Thesecondcolumncontains
thenumberofemployeesthathavethatidentificationnumber.Therowsaresortedbythenumber
ofemployeesthathaveeachidnumber(forexample,thecount).
2. OntheQuerymenu,clickSQLSelectandfillinthedialogbox.
Also,changeEMPLOYEEtothenameofyourtableandID_Numtothenameofyourdatacolumn.
Intheexample,theSQLstatementreturnsaquerytablecontainingalloftherowsfromEMPLOYEE
withduplicateddatacolumnvalues.ThewhereconditionselectsallrowsfromEMPLOYEEthat
haveanidentificationnumberthatisthesameasoneoftheIDnumbersintheCount_By_IDquery
table.Thissub-selectfindsallidentificationnumbersthatoccurmorethanonce.
CalculatingtheDistancetoaFixedPoint
InMapInfoProitispossibletocalculatethedistancefromonepointtoanother.Thisexampleshows
howtocalculatethedistancefromafixedpointtoeverypointinageocodedtableandstorethe
resultinanothertable.
1. Determinethelocationofthefixedpoint.Tofindthepositionofasymbolonthemap,double-click
thesymbolwiththeSelecttool.Inthisexample,theXvalueis-101.697209andtheYvalueis
35.550036.
2. OntheQuerymenu,clickSQLSelectandfillintheSQLSelectdialogbox,substitutingyourX
andYvaluesforthevaluesmentionedabove
AsinthepreviousSQLquery,replaceEMPLOYEEwiththenameofyourtable,andLNameand
FNamewiththenameoftherelevantcolumnfromyourtable.
•SelectColumns:LName, FName, Distance(-101.679209, 35.550036,
CentroidX(obj), CentroidY(obj), "mi") "Dist"
•fromTables:EMPLOYEE
•intoTableNamed:CUSTDIST
3. ClickOK.Theresultingquerytablecontainslastnamesandfirstnamesplusanewcolumncalled
DISTANCEwhichrecordsthedistancebetweenthefixedlocation(-101.697209,36.550036)
andthepointassociatedwitheachrowofthetable.
4. Tosavetheresultsinapermanenttable,ontheFilemenu,clickSaveCopyAs,andsavethe
CUSTDISTtable.
5. ForinstructionsonenteringSQLqueriesusingtheExpertbutton,seetheHelpSystem.
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10 - Creating Thematic
and Other Themed
Maps
Thematicmappingisapowerfulwaytoanalyzeandvisualizeyourdata.
Yougivegraphicformtoyourdatasothatyoucanseeitonamap.Patterns
andtrendsthatarealmostimpossibletodetectinlistsofdatareveal
themselvesclearlywhenyouusethematicshadingtodisplaythedataon
amap.
YoucancreatethematicmapswithMapInfoProusingthefollowing
methods:rangesofvalues,graduatedsymbols,dotdensity,individual
values,barandpiechartsandcontinuousgrid.Therearealsoseveral
variationsonandoptionswithinthesemethods,suchasbivariatethematic
mappingandinflectionpoint,thatgiveyouevenmorewaystoanalyzeyour
data.
ForclarificationoftheusesofthematicmapsinMapInfoPro,seeMapInfo
ProinActionintheHelpSystem.
TheHelpSystemalsocontainstheserelatedtopics:
•BivariateThematicMapping
•Workingwith3DandPrismMaps
In this section
MapInfoProinAction
295
UsingThematicMappingtoAnalyzeInformation
296
CreatingaThematicMap
312
ChangingtheDisplayParametersofaMap
318
UpdatingColumnsusingThematicMapping
321
WorkingwithGridSurfaceMaps
327
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MapInfo Pro in Action
Sinceyouhaveallthetoolsyouneedtomakeeffectiveandusefulmaps,itistimetotalkabout
whatmakesamapeffectiveanduseful.Whateveryouneedyourmaptosay,whetheritistoconvey
information,calculatedistancesbetweenhealthcareprovidersandtheirpatients,orgetacountof
thenumberofcustomersthatlivewithinagivenradiusofanoutletlocation,MapInfoProcanhelp
youdothat.Bymakingselectionsfromyourtable,youcanextractinformationfromsetsandsubsets
ofyourdataorseepatternsanddistributions,gettinganswerstosuchquestionsas:Whichofmy
customersboughtmorethan$5000ofequipment?Whichofmycustomersislocatedwithina200
mileradiusofmywarehouse?Whichofmycustomersboughtmorethan$5000ofequipmentand
islocatedwithina200mileradiusofmywarehouse?Formoreonselecting,seeSelectingYour
DatainMapInfoPro,and QueryingYourDatainMapInfoPro.
MapInfoProreferstothisgroupingoflikeinformationasthematicmapping.
•Foranexample,seeCanYouGiveMeanExampleintheHelpSystem.
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Using Thematic Mapping to Analyze Information
Thematicmappingistheprocessofenhancingyourmapaccordingtoaparticulartheme.Atthe
cornerstoneofthethemeisthedatainyourtable.Themesrepresentyourdatawithshadesofcolor,
fillpatterns,symbols,barandpiecharts,andgrids.
WithMapInfoPro,youcreatedifferentthematicmapsbyassigningthesecolors,patterns,orsymbols
tomapobjectsaccordingtospecificvaluesinyourtable.MapInfoPro'sbarandpiechartsallow
youtomakedatacomparisonsforeachrecord.Gridsallowyoutoseecontinuouschangeofyour
dataacrossanarea.
Thethematicmapfeatureusesawizardmadeupofaseriesofthreedialogboxestohelpyou
choosethetypeofthematicmapyouwant,thetable(s)andfieldsthatwillbeusedtoconstructthe
map,andavarietyofoptionstocustomizeyourmap.
MapInfoPro'sthematictemplatesmakeiteasytostartconstructingatheme.Justchooseatemplate
thatrepresentsthetypeofthematicmapyouwant.Thetemplatesarefullycustomizableandcan
besavedasnewtemplatesforfuturethematicmappingneeds.Morethan40templatesshipwith
MapInfoPro.
Figure:ComparisonofSeniorPopulationtoTotalU.S.Population
PlanningYourThematicMap
Beforeyoucreateathematicmap,itisimportanttoknowabouttheelementsthatmakeupathematic
mapandhowtoputthemtogether.Thissectionwilldiscussthematicvariables,whereyoucan
obtainyourdata,usingdatafromthesametableoranothertable,andthearrangementanddisplay
ofthematiclayers.
WhatisaThematicVariable
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Thedatathatyoudisplayonyourthematicmapiscalledthethematicvariable.Dependingonthe
typeofthematicanalysisyouareperforming,yourmapcanshowoneormorethematicvariables.
Rangesofvalues,gridshading,graduatedsymbols,dotdensity,andindividualvaluesmapsall
examineonevariable.Withbarorpiecharts,youcandisplaymorethanonethematicvariableata
time.
Athematicvariablecanalsobeanexpression.ChooseExpressionfromthefieldlistinplaceofa
datafieldtoconstructastatementthatderivesinformationfromthedatainyourtable(s).Although
anexpressioncanbemadeupofmorethanonevariable(forexample,POP_1990-POP_1980),
forpurposesofthematicmapping,acompleteexpressionisequivalenttoonethematicvariable.
SeeQueryingYourDatainMapInfoPro,andCreatingExpressionsintheMapInfoProUser
Guide,whichislocatedintheDocumentationsubfolderofyourinstallationdirectory,formoredetailed
information.
Youcanalsocreatebivariatethematicmaps,whereonemapobject,suchasasymbol,represents
twodifferentpiecesofdata.Thesymbolcolor,forexample,canrepresentonethematicvariable,
andthesymbolsizecanrepresentanother.
WheretoObtaintheData
Beforeyoubeginyourthematicmap,youneedtodecidewhatinformationyouwanttodisplayand
locatewherethatinformationresides.Itcaneitherbeinthetableonwhichyouarebasingthemap,
oritcanbeinanothertable.
Ifthedataisinthesametableonwhichyouarebasingthemap,choosethedesiredfielddirectly
intheFieldlistboxintheCreateThematicMap-Step2of3wizardpanel.
Ifthedataisinanothertable,youmustfirstbringthedataintothetableonwhichyouarebasing
thethematicmap.ThisrequirescreatingatemporarycolumnusingUpdateColumn.
Eachsituationisdescribedinthenextfewsections.
UsingDatafromtheSameTable
Ifyouareusingdatafromthesametable,choosethetableandfieldonwhichyouwanttobase
yourthematicmapintheCreateThematicMap-Step2of3wizardpanel.
Forexample,youhaveatableofparkingmetersthatcontainsthelocationoftheparkingmeterand
thelasttimetheparkingmeterwasemptied.UsingIndividualValuesyouwanttoshadetheparking
metersymbolsaccordingtothelasttimeeachmeterwasemptied.MapInfoProwillassignacolor
toeachtime.IntheCreateThematicMap-Step2of3wizardpanel,choosetheparkingmeter
tableasyourtable,andchoosethefieldthatcontainsthetimeeachmeterwasemptied.
UsingDatafromaDifferentTable
TheJoinfeaturewithintheCreateThematicMap-Step2of3wizardpanelenablesyoutouse
datafromotheropentablestocreateathematicmap.ChooseJoinintheFieldlistboxtodisplay
theUpdateColumndialogboxwhereyoucancreateatemporarycolumninthebasetable.
Thetemporarycolumncancontaindatatakendirectlyfromtheothertable,oryoucanaggregate
thedatatocreatederivedinformationforthetemporarycolumn.
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Forexample,youhavetwotables:atableofcountyboundariesandatableofpolicestations.You
wanttoshadethetableofcountyboundariesaccordingtothenumberofpolicestationsineach
county.
Todothis,alltheinformationyouwanttousemustbeinthecountytable.Therefore,youmustadd
policestationdatatothistable.
UsingUpdateColumn,youcreateatemporarycolumninthecountyboundariestablethatwillstore
thepolicestationinformation.Tocreatethiscolumn,thetwotablesmusthavealinksothatMapInfo
Procanaccessthedatathatgoesintothetemporarycolumn.Thelinkcaneitherbeamatching
field(likecountyname),oryoucanmakethelinkgeographically(policestationscontainedwithin
counties).
AnexamplelaterinthischapterexplainsmoreaboutUpdateColumn.
MethodsofThematicMapping
WhenyoucreateathematicmapinMapInfoPro,thethematicshadingisaddedtoyourmapasa
separatelayer.Itisdrawnontopofthebasemaplayer.
SeparatingThematicLayers
Separatingthematiclayersfromthebasemaplayerprovidesyouwithseveralimportantoptions:
•Graduatedsymbolthematicmapsdonotrequirethatyourbasemapcontainpointobjects.Instead,
graduatedsymbolobjectsarebuiltregardlessofthemapobjecttype.Therefore,evenifyourbase
mapcontainsregionorlineobjects,youwillstillbeabletocreateagraduatedsymbolsmap.
•Youcanhavemultiplethematiclayersperbasemaplayer.Insomecases,youdonothaveto
addanotherbaselayertothemaptocreateanotherthematiclayer.Youcandisplaymorethan
onethematiclayeratatime,aswellasperformbivariatethematicmapping.
•YoucanuseLayerControltoturnthedisplayonoroffforagiventhematiclayer.Thelayeritis
basedoncancontinuetodisplay.Youcanalsosetindividualzoomlayersonthematicmaps.
OrderingofThematicLayers
Todisplaythematiclayersproperly,theymustbeinaspecificorder.Thisisespeciallyimportant
whenyouwanttodisplaymorethanonethematiclayeratatime.Forexample,youwouldwantpie
orbarchartsforanareamaptodisplayontopofregionsthatareshadedinordertoseethem.
Thefollowingliststheorderofmaplayersfromtoptobottom(notethatmaplayersaredrawnfrom
thebottomup):
1. Pies,Bars,orGraduatedSymbolthematiclayer.
2. DotDensitythematiclayer.
3. Rangedthematiclayer-whereColororSizeAttributesareapplied.
4. Ranged(orIndividualValue)thematiclayer-whereAllAttributesareapplied.
5. Majorlayerorbaselayer.
6. Gridthematiclayer.
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Whenyoucreateanewthematiclayer,MapInfoProautomaticallyinsertsitintoitsproperplace.
DisplayingThematicLayers
Youcanturnthedisplayonandoffforthematiclayersthesamewayyoucanforothermaplayers.
AllthedisplaysettingsinLayerControlarealsoapplicabletothematiclayers,enablingyoutoset
azoomlevelforeachthematiclayer.YoucanalsoaccesstheModifyThematicMapdialogbox
throughLayerControlbydouble-clickthethematiclayer.
Figure:LayerControl(ShowingThematicLayeraboveBaseMap)
Thematiclayersaredisplayedinthelistwiththisnamingconvention:
<Thematic type> with/by <variable-list>
Thetypeofthematicmapisnotedfirst,followedbythelistofvariablesusedtocreatethemap.For
example,apiethematiclayerthatusescommutingdataislistedthisway:
PieswithComAlone,ComCarpool...
Thevariablelististruncatedifthereisnotenoughroomtodisplayeachvariableinyouranalysis.
TypesofThematicMaps
WithMapInfoProyoucancreateseventypesofthematicmaps:
•Ranges
•BarCharts
•PieCharts
•GraduatedSymbol
•DotDensity
•Individual
•Grid
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Eachhasitsownpurposeanduniqueattributes.Forexample,usingRangesofValues,youcould
thematicallyshadeamapoftheworldaccordingtopopulationdensity.Youcouldshadethecountries
withgraduatedshadesofred,thedarkestredrepresentingthemostdenselypopulatedcountries,
andthepalestredrepresentingtheleastdenselypopulatedcountries.Ataglanceyoucanseethe
distributionoftheworld'spopulation.
Youarenotlimitedtorepresentingnumericvalueswiththematicmapping.Nominalvaluesalsomay
beshadedthematically.Forexample,youhaveatableofundergroundcables.Thosecablesthat
havenotbeenservicedinthepastsixmonthsarelabeledprioritystatus.UsingIndividualValues,
youcanshadethecablesaccordingtotheirrepairstatus.Allrecordswiththesamevaluewillbe
shadedthesame.Seetheindividualsectionslaterinthischapterformoreinformationoneachtype
ofthematicmap.Theyoffergeneralinformationonthemethodsavailableforcreatingthematic
maps.Formoreinformationonanyofthesemethodsandoptions,seeThematicMappinginthe
HelpSystem
RangedMaps
Whenyoucreatearangedthematicmap,MapInfoProgroupsallrecordsintorangesandassigns
eachrecord'sobjectthecolor,symbol,orlineforitscorrespondingrange.Forexample,ifyouwanted
tovisualizethepopulationoftheworldbygrowthrate,youwouldshadecountriesaccordingtotheir
reportedgrowthrateamounts.
WiththeRangedmapfeature,MapInfoProgroupsthegrowthrateamountsintoranges.Forexample,
inthenexttable,allcountriesthathadgrowthratesbetweenzeroandonepercentaregroupedinto
onerange.Countriesthathadgrowthratesbetweenoneand2.2aregroupedinaseparaterange.
Countriesthathaveratesbetween2.2and3.1areinathirdrange,andthosecountriesreporting
greaterthan3.1areinafourthrange.
Figure:RangedMap
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