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Selecting Your Data in MapInfo Pro
WhileMapInfoProallowsyoutoattachdatatoobjectsonamap,itstrueanalyticalpowerisits
abilitytogroupandorganizedata.Onceyourdataisbrokendownintologicalgroups,youcan
analyzeitbasedononeormorevariables.
Forexample,youhaveabasketoffruit.Youwanttoorganizethefruitintodifferentcategories,
basedononeormorevariables:
•Putalltheapplesintoonegroup
•Putallthecitrusfruitintoonegroup(oranges,lemons,grapefruit)
•Putallthefruitthatbeginswithavowelintoonegroup(oranges,apples,apricots)
Therearemanydifferentwaysthatyoucouldgroupthefruit.Somefruitwouldfallintomorethan
onecategory(orangesarecitrusfruitandalsobeginwithavowel).Youcouldalsousemorethan
onevariabletogroupyourfruit-putallthecitrusfruitthatbeginswithavowelintoonegroup.
MapInfoProcanretrieveinformationorevenindividualrecordsfromwithinyourdata.Wereferto
therecordorrecordsthatareretrievedthiswayasselections.Aselectionisasubsetofdatathat
hasbeencollectedbasedononeormorevariables.
Forexample,youhaveatableofcustomerrecords.Youcouldcreateasubsetofallcustomerswho
livewithina50mileradiusofPrague.Or,youcouldcreateasubsetofallcustomerswhopurchased
over$1000ofmerchandise.Or,youcouldcreateasubsetofallcustomerswhoselastnamebegins
withtheletter"B".
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Thestatementsaboveusedtocreatethesesubsetsareknownasqueries.Aqueryisjustanother
wordforaquestion-whichofmycustomersspentmorethan$1,000?Whichofmycustomerslives
within50milesofPrague?
Aswiththefruitexample,therearemanydifferentwaystogroupyourdata.Somedatarecordswill
obviouslyfallintomorethanonecategory.Youcouldalsousemorethanonevariabletogroupyour
data.Whichofmycustomersliveswithin50milesofPragueandpurchasedover$1000of
merchandise?Thissectiongivesyousomeexamplesandsomepracticalapplicationsof"selecting"
inMapInfoPro.
CharacteristicsofSelections
Selectionsaretemporarytables.Whenyoumakeaselection,MapInfoProcreatesthistemporary
table(calledaselection)tostoretherecordsyouhaveselected.
Youcanperformmanyofthetaskswithaselectiontablethatyoucanperformwithapermanent
(base)tablesuchas:
•ViewitinaBrowser,aMap(ifithasgraphicobjects),aGraph,classicLayoutwindow,oraLayout
Designerwindow.
•Cutandcopyitintotheclipboardandpasteitintoanothertable,orevenintoanotherapplication.
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•Useittoeditatable.Ifyouwanttoeditonlycertainrecordsinatable,youcangetthoserecords
intoaselectionandtheneditthatselection.
•Makeafurtherselectionfromit.
Toconvertselectionsintopermanenttables,ontheFilemenu,clickSaveCopyAs.Onceyouhave
savedthetemporaryselectiontableasapermanenttable,youcantreatthenewtablelikeanyother
table.Selectiontablesaretotallydependentonthetablefromwhichtheywerecreated.Ifyouclose
abasetable,allassociatedselectiontablesaredeleted.
SelectionCommandsandToolDescriptions
MapInfoProgivesyouanumberofcommandsandtoolsformakingselections.Theyfallintotwo
categories:
•Selectingfromthescreen:Selecttool,RadiusSelecttool,BoundarySelecttool,PolygonSelect
tool,MarqueeSelecttool,InvertSelectiontool,SelectAllcommand.Toselectrecordswiththe
tools,clickorencircletheassociatedgraphicobjects.Toselectrecordsfromalayeratthesame
time,ontheQuerymenu,clickSelectAll.Or,selectalayeronthemap,right-clicktodisplaythe
contextpop-upmenu,andselectSelectAllfromSelectedLayer.
•Selectingwithqueries:Select,SQLSelect.Whenyouselectrecordswitheitherofthesemethods,
youcreatealogicalexpressionthatMapInfoProusestoselecttherecords.Forexample,the
expressionSALES>20000meansthatMapInfoProwillselectonlythoserecordswithsales
higherthan$20,000.WediscussSelectandSQLSelectinmoredetailinUsingSelecttoCreate
QueriesandUsingSQLSelecttoQueryData).
ToimportaGMLfile:
1. ChooseTable>ImporttodisplaytheImportFiledialogbox.ChooseOSMasterMap(*.GML)
fromtheFilesoftypedrop-downlistandnavigatetoitslocation.
2. SelectaGMLfiletoimport.ClickOpen.TheGMLImportdialogboxdisplays.
SelectingfromtheScreen
Toselectobjectsfromthescreen,thelayerthatcontainstheobjectsmustbeSelectable.Tomake
alayerselectable,ontheMapmenu,clickLayerControl.IntheLayerControlwidow,clickthe
Selectable
icontomakethelayerselectable.
WhenyouselectmapobjectsinaSelectablelayer,MapInfoProhighlightstheobjectsusingthe
settingsdefinedintheHighlightControlsectionofthePreferencesdialogbox(Optionsmenu).
WhenyouselectmapobjectsinanEditablelayer,MapInfoProplacesedithandles(smallsquares)
aroundtheextentsoftheobjectyouselected.
IfyouhavemorethanoneSelectablelayerinaMapwindow,MapInfoProselectsobjectsfromthe
topmostSelectablelayer.
Forexample,youhaveaSelectablelayerofcountyboundariesandaSelectablelayerofstate
boundaries.IfthecountyboundariesareinthetopmostlayerintheMapwindow,MapInfoPro
selectsobjectsfromthecountylayer.IfthestateboundariesareinthetopmostlayerintheMap
window,MapInfoProselectsobjectsfromthestateslayer.WhenyouusetheSelecttool,MapInfo
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ProalsodisplaysInfoTipsforthetopmostSelectablelayer.Asyoumoveyourcursorovertheobjects,
InfoTipsdisplaytheobject'slabelexpression.YoucanturnofftheInfoTipsintheMapwindow
Preferences(ontheOptionsmenu,pointtoPreferencesandclickMapwindow).
Likewise,ifyouperformaboundarysearch,theboundaryobjectthatyouwanttosearchshouldbe
inthetopmostlayer.
Forexample,youhavealayerofpostalcodeboundariesandalayerofstateboundaries.Ifyou
wanttoselectallobjectsthatfallwithinapostalcodeboundary,thepostalcodelayershouldbethe
topmostboundarylayer.Ifyouwanttoselectallobjectsthatfallwithinagivenstate,thestatelayer
shouldbethetopmostboundarylayer.YoucanreorderthelayersbyselectingtheMapmenu,and
clickingLayerControl.
Youcanselectobjectsfromtablesotherthanthetopmosttable,byholdingdowntheCtrl
keywhen
youareselectinganobject.Forexample,sayyouhavethreeselectablelayers,suchasSTATES,
COUNTIES,andCITIES.IfyouwanttoselectobjectsintheSTATEStable,butitisthebottomlayer
intheMapwindow,dothefollowing:
1. HolddowntheCtrl
keyandclickthemapwiththeSelecttool.Youarenowinthesecondlayer.
2. HolddowntheCtrl
keyandclickthemapagainwiththeSelecttool.Youarenowselecting
objectsfromthethirdlayer,theSTATESlayer.
SelectingaSingleObjectfromaMaporLayout
MakingselectionsisabasicMapInfoProoperation,usingtheSelecttoolisonlyonewayofmaking
selections.
Thetoolmustbeactivebeforeyoucanuseit;activatethetoolbyclickingonit.Thetool'siconis
highlightedintheMaintoolbarandthecursorbecomesapointer.Ifyouareeditingrecordsina
browser,thecursorbecomesanI-beam.
Toselectasingleobjectfromamaporanactivemapinalayout:
1. ClicktheSelect
buttonintheMaintoolbar.
2. Clicktheobject.
ThelayerwheretheobjectislocatedhastobeselectableintheMapwindow.Whenanobjectis
selecteditishighlightedaccordingtothesettingsyouspecifiedinOptions>Preferences.
•Whenthelayeriseditable,theselectedobjectissurroundedbyedithandlesandiscoloredand
patternedasitwasoriginallydefined.
•Whenyouselectanotherobject,thefirstobjectisunselected.
•Toselectanumberofobjectsfromamaporanactivemapinalayout,holdtheShift
keydown
andclickthedesiredobjectswiththeSelecttool.
SelectingTools
MapInfoProincludesseveraltoolsontheMaintoolbartoallowyoutochooserecordsforfurther
viewingandanalysis,includingtheSelecttool,RadiusSelecttool,MarqueeSelecttool,Polygon
Selecttool,BoundarySelecttool,andInvertSelectiontool.Eachtoolisdiscussedinthenextsection.
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UsingtheSelectTool
UsetheSelect
tooltoselectobjectsoneatatimeortoselectallobjectsthataregenerallyin
thesameareaoftheMapwindow.Youselectanobjectbyclickingitusingthemouse.
ToselectanobjectusingtheSelecttool:
ToselectanobjectusingtheSelecttool:
1. Makethelayerthatyouwanttoselectobjectsfromselectable.OntheMapmenu,clickLayer
ControlandclicktheSelectable
iconforthelayer.
2. ChoosetheSelectbuttonfromtheMaintoolbar.
3. ClickanobjectintheMapwindow.Ifthatobject'slayerisselectable,MapInfoProhighlightsthe
object.Ifthelayeriseditable,MapInfoProputsedithandlesaroundtheextentsoftheobject.If
thelayerisneithereditablenorselectable,MapInfoProdoesnotallowyoutoselecttheobject.
4. OntheWindowmenu,clickNewBrowserWindowtodisplayselectedrecordsinaBrowser.
ChooseSelectionfromthelistoftables.MapInfoProcreatesaBrowserofthenewtemporary
table.ToselectrecordsfromtheBrowser,simplyclickeachrecordwiththeSelecttool.
ToselectmultipleobjectsindividuallyinaMapwindow:
1. Clickthefirstobjecttoselectit.
2. HolddowntheShift
keyandclickanotherobject.MapInfoProselectsthatobject,too.Ifyou
selectasecondobjectwithoutholdingdowntheShift
key,MapInfoProunselectsthefirstobject
andselectsthesecondobject.
3. Foradditionalinstructions,seeSelectingtheNextSelectableObjectBeneaththeCurrentObject
intheHelpSystem.
UsingtheUnselectAllTool
UsetheUnselectAll
tooltodeselectalloftheselectedobjects.Youusethismostoftenwhen
youhaveselectedtoomanyobjectsandwanttostartover.
ToselectanobjectusingtheSelecttool:
ChoosetheUnselectAllbuttonfromtheMaintoolbar.
DeselectingObjectsandRemovingObjectsfromtheSelection
Todeselect:
•AnobjectorremoveitfromtheselectioninaMapwindow,presstheShift
keywhileclicking
ontheobject.Whenyouclick,theobjectisremovedfromtheselectionset.
•Allobjects,ontheQuerymenupointtoUnselectAll,orclickonthemapwherethereareno
objects.
Foradditionalinformation,seeMovingSelectedObjectsandRotatingSelectedObjectsintheHelp
System.
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UsingtheRadiusSelectTool
TheRadiusSelect
toolselectsallobjectsthatfallwithinagivenradius.Forexample,youhave
atableofblooddonorsandatableofblooddonationsites.UsingtheRadiusSelecttool,youcould
createatemporarylistofblooddonorsthatlivewithinaone-half-mileradiusofeachblooddonation
site.
TheRadiusSelecttoolselectsallobjectswhosecentroidfallswithinthecircle.Theobjectdoesnot
havetobecompletelyboundedbythecircle.
Toselectobjectswithinaradius:
1. Makethelayeryouwanttoselectobjectsfromselectable.OntheMapmenu,clickLayerControl
andclicktheSelectable
iconforthelayer.Makesurethelayeriseitheratthetopofthelist,
orthatthelayersabovetheylayeryouwantarenotselectable.
2. ChoosetheRadiusSelecttoolfromtheMaintoolbar.Thecursorbecomesahandwhenmoved
overtheMapwindow.
3. Clickaplaceonthemapthatyouwouldliketouseasthecenterpointofyourradiussearch.For
example,ifyouwanttoselectallthehomesofallofthechildrenthatlivewithinthreeblocksof
theschool,clicktheschooliconandusethatasthecenterpoint.
4. Holddownthemousebuttonanddragthemouseawayfromthecenterpoint.MapInfoProdraws
acirclearoundthepointandreportstheradiusofthecircleintheStatusBar(lowerleftcorner
ofthescreen).
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5. Whenyouhavethedesiredradiusreleasethemousebutton.MapInfoProhighlightsallmap
objectsthatfallwithinthatcircle.
6. Toseealistofalltherecordsthatfallwithinthatcircle,chooseNewBrowserWindowfromthe
Windowmenu.ChooseSelectionfromthelistoftables.MapInfoProcreatesaBrowserofthe
newselectiontable.
UsingtheMarqueeSelectTool
TheMarqueeSelect
selectsobjectswithinarectangle.Byclickinganddraggingusingthe
Marqueetool,youcreateadottedrectangle,ormarqueeboxaroundobjectsyouwanttoselect.All
SelectableobjectsinthetopmostSelectablelayerwillbeincludedinthemarqueebox.
Toselectobjectsfromanotherlayer,youmustturnoffselectableinLayerControlforthe
upperlayers.Onlyobjectsfromonelayeratatimeareselected.
Note:
Toselectobjectswithinarectangle:
1. Makethelayerthatyouwanttoselectobjectsfromselectable.OntheMapmenu,clickLayer
ControlandclicktheSelectable
iconforthelayer.
2. ChoosetheMarqueeSelecttoolfromtheMaintoolbar.Thecursorbecomesahandwhenmoved
overtheMapwindow.
3. Clickaplaceonthemapoutsideoftheareayouwanttoincludeinthemarqueebox.
4. Holddownthemousebuttonanddragthemousetoformadottedrectanglearoundthepoints
youwanttoselect.
5. Whenyouhavereachedthedesiredrectanglesize,releasethemousebutton.MapInfoPro
highlightsallmapobjectsthatfallwithinthatrectangle.
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6. Toseealistofalltheselectedrecords,ontheWindowmenu,clickNewBrowserWindow.
ChooseSelectionfromthelistoftables.MapInfoProcreatesaBrowserofthenewselection
table.
AddingObjectstotheSelectionSet
UsetheShift
keywiththeMarqueeSelecttoolwhenyouwishtoaddnewlyselectedobjectsto
thepreviousselection.
UsingthePolygonSelectTool
ThePolygonSelect
toolselectsmapobjectswithinapolygonthatyoudrawonamap.
ToselectobjectswiththePolygonSelecttool:
1. Makethelayerthatyouwanttoselectfromselectable.OntheMapmenu,clickLayerControl
andclicktheSelectable
iconforthelayer.
2. ChoosethePolygonSelecttoolfromtheMaintoolbar.Thecursorbecomesapointinghand
whenmovedovertheMapwindow.
3. Clickthemaplocationatwhichyouwanttoplacethefirstendpointofthepolygon.Movethe
cursoroveryourmapinanydirection.MapInfoProdrawsalinefromthepointwhereyouclicked
tothecursor.
4. Clicktocreateanotherendpoint.Continuetomovethecursorandclickuntilyouhavethedesired
numberofsidestoyourpolygon.
5. Toclosethepolygon,makeyourlastclickascloseaspossibletothefirstclick.MapInfoPro
closesthepolygonandselectstheobjectsthatarewithinit.
PressShift
whileusingthePolygonSelecttooltoaddnewlyselectedobjectstotheprevious
selection.
Note:
UsingtheBoundarySelectTool
TheBoundarySelect
toolselectsobjectsthatfallwithinagivenregionorboundary.Whenyou
usethistool,MapInfoProselectsallobjectswithinanyboundaryonthemap,suchasstateor
countyboundaries,policeprecincts,orsalesterritories.
Forexample,youhavealayerofstatesandalayerofretailers.UsingtheBoundarySelecttool,
youcouldclickastateandcreateatemporarylistofalltheretailersinthatstate.
Toselectobjectswithinaregion:
1. Makethelayerthatyouwanttoselectobjectsfromselectable.OntheMapmenu,clickLayer
ControlandclicktheSelectable
iconforthelayer.
2. ChoosetheBoundarySelecttoolfromtheMaintoolbar.Thecursorbecomesacrosshairwhen
movedovertheMapwindow.
3. Clickwithinaboundaryobject.MapInfoProselectsallobjectsthatfallwithinthatboundary.
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4. Toseealistofalltherecordsthatfallwithinthatboundary,ontheWindowmenupointtoNew
BrowserWindow.ChooseSelectionfromthelistoftables.MapInfoProcreatesaBrowser
windowwiththenewselectiontable.
UsingtheInvertSelectionTool
TheInvertSelection
toolisaconvenientwaytoselectmanyobjectsatonce.Yousimplyselect
thefewobjectsthatyoudonotwant,andtheninverttheselectiontoselectalltheobjectsyoudo
want.
1. Makethemaplayerthatyouwanttoselectfromselectable.OntheMapmenu,clickLayer
ControlandclicktheSelectable
iconforthelayer.
2. MaketheSelecttoolactive,andclickoneortwomapobjects.
3. ClicktheInvertSelectiontool.MapInfoProselectsalltheobjectsthatarenotpartofthecurrent
selection,andcancelsthecurrentselection.YoucanalsofindInvertSelectionintheQuery
menu.
UnselectingObjectsorRecords
Youmaychooseto:
•Unselectoneobjectorrecordfromagroupofselectedobjectsorrecords.
•Unselectagroupofselectedobjectsorrecords.
•Unselectallselectedobjects.
TocanceltheselectionofarecordfromagroupofselectedrecordsinaBrowerwindow,pressthe
Ctrl
keywhileselectingrecords.
Tocanceltheselectionofallselectedobjects,youcaneitherclicktheMapwindowwherethereare
noobjectsorchoosetheUnselectAllcommandfromtheQuerymenu.
Querying Your Data in MapInfo Pro
Aqueryisamathematicalquestionthatyouposetoyourdatabasetocollectinformation.InMapInfo
Pro,therearetwoquerybuildersavailableundertheQuerymenu,SelectandSQLSelect.
Figure:SQLQuerytoDetermineHomesAffectedbyAirportNoisePollution
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InthecaseofSelect,youcanposeaquestionofasingletable.Forexample,
•Whichofmycustomersspentmorethan$20,000?
•WhichofmycustomersliveinVermont?
InthecaseofSQLSelect,youcanaskyourquestionfromoneorseveraltable(s)ofinformation
andperformthesetasks:
•Derivenewcolumns-columnsthatcalculatenewvaluesbasedonthecontentsofyourexisting
columns.
•Aggregateyourdatasothatyouseeonlyalistingofsubtotalsinsteadofseeingyourentiretable.
•Combinetwoormoretablesintooneresultstable.
•Showonlythecolumnsandrowsthatinterestyou.
SelectingandUsingQueries
Selectallowsyoutoqueryatable.Itallowsyoutoselectrecordsandobjectsfromatableaccording
totheirattributes.YoucanuseittohighlightobjectsinaMaporBrowserwindowthatmeetcertain
criteria.Youcanalsocreatearesultstablethatyoucanbrowse,map,orgraphlikeanyothertable.
Forinstance,byformulatingquerieswithSelect,youcanaskMapInfoProto:
•Showonlypostalcoderegionswheretheaveragehouseholdincomeisabove$65,000.
•Showonlypostalcoderegionswherethemedianageis42.
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