Exercise 4 - Creating and Editing Spatial Data

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<ul><li><p>CreatingandEditingSpatialData</p><p>SpatialDataOneoftheveryimportantthingsthatanArcMapuserhastolearnishowtocreateandeditspatialdata.But,itisalsoasimportantastolearntheconceptofspatialdata.RememberthatinArcMap,ausercanmakeuseoftwotypesofdata,thespatialandthenonspatial.Nonspatialdataaredatathatisnotgeographicalintegrated,whichmeanthatinusingsuchkindofdatayouhavetoperformsomeoperations.Spatialdataontheotherhand,isalreadyapartofagraphicalrepresentationofanarea.Spatialdatacanbeintegratedintoaline/polyline,point,orpolygon.Withthatinformation,wheneverauserwillclickanyfeaturewithinamap(withtheuseofIdentify)ArcMapwillbeabletodisplayaddedinformationasincludedwithinthespatialdata.Spatialdataisalsotermedasgeospatialdataorgeographicinformation.Includedinthedataaregeographiclocationsoffeaturesandboundaries,coordinates,andtopology.MostlyspatialdataaretheoneneededforGISprocessing.</p><p>DataAcquisitionsAcquiringspatialdatacanbedoneinmanyways.Thereiswhatwecalledasdigitizing,itistheprocesswhereaprintedmaphastobecapturedusingaphotoscannerandtheimagethatitproducedistracewithinArcMap.Anotheronestillwiththeuseofsketchingmethod,willbefromaerialphotographandtraceaswellwithinArcMap.Also,wecanacquirespatialdatabyactuallydoingasurvey.SurveyscanbedoneusingtheTotalStationorusingtheGlobalPositioningSystem(GPS).DatafromtheTotalStationortheGPSstillneedstobeprocessedinorderforittobeusedwithinArcMap.ThedatathathasbeengatheredwillthenbemanipulatedinorderforittobealignedwithanycoordinatesystemsandonanyexistingArcInfospatialdata.</p><p>GISLaboratoryExercise4CreatingandEditingSpatialDataObjectives:Inthisexercise,youwill:</p><p>- AlignanacquiredaerialphotousingGeoreferencing- CreatingandEditingspatialdatafromaerialphotograph- ImportingspatialdatafromCADfile</p><p>UsingGeoreferencingtoalignanaerialphotograph</p><p>41</p></li><li><p>Acquiringaspatialdatacanbedoneinmanyways.Withtheexistenceoftheinternet,wecanbeabletoacquireabundantsourcesofthesedata.Forthisportionoftheexercise,wewillutilizeanaerialphotoobtainedfromGoogleEarthprogram.</p><p>o RunArcCatalog.</p><p>o Makesurethatthefileextensionisvisible.Hint:ClickCustomizemenuandthenselectArcCatalogOptions.</p><p>o ClicktheGeneraltabifnecessary,andmakesurethatFolderConnections(alwaysshown),Toolboxes,andReturntolastlocationwhenArcCatalogstartsuparetheonlyboxesthatshowsthechecksign.ThenclickOK.</p><p>o VerifyLearnGIS2folderappearsonyourFolderConnections.Ifnot,thenyouhavetoaddLearnGIS2folder.</p><p>o ExpandLearnGIS2andselectCreatingandEditingSpatialDatafolder.</p><p>1. Whatarethefilesanditscorrespondingtypecontainedinthisfolder?________________________________________________________________________</p><p>o ExpandCreatingandEditingSpatialDatafolder,rightclickonSRP_01.jpg,andselectPropertiesfromthepopupmenu.</p><p>2. DoesthisRasterDatasetcontainanyspatialreference?____________________</p><p>o ClosethePropertiesdialogboxandclickonthePreviewtab.</p><p>3. DescribethecontentofSRP_01.jpg.________________________________________________________________________</p><p>o CloseArcCatalogandrunArcMap.</p><p>o InArcMap,clickFilemenuandselectOpen.LocateCebuCitySRP.mxdmapdocumentin..\LearnGIS2\CreatingandEditingSpatialDatafolderandclickOpen.</p><p>YourcurrentviewistheSRPAreawhichisaviewbookmark.Currently,SRP(SouthRoadProperties)doesnotexistonthismap.ItisourobjectivetocreatethemapoftheSRP.Since</p><p>42</p></li><li><p>theonlywaywecandothatistomakeuseofareferencemapwhichisanaerialphotoofthearea.</p><p>o FromCatalog,locateSRP_01.jpganddragdropittotheDataFrame.</p><p>o OntheCreatePyramidsforSRP_01.jpg(4000x2604)dialogbox,clickonYes.(IfadialogboxrelatedtoSpatialReferencewillappear,justclickOK).</p><p>o ZoomtoFullExtent.</p><p>4. Describewhathappened.Whatisthescaleofthemap?Canyouseetheimageandthe</p><p>mapclearly?________________________________________________________________________________________________________________________________________________________________________________________________________________________</p><p>o ZoomtoSRP_01.jpglayer.Hint:RightclickSRP_01.jpgandthenclickZoomToLayer.</p><p>o UsingthemousescrollortheZoomOuttool,zoomouttheDataFrameuntilyoureachtheapproximatescalevalueofthefullextentview.</p><p>5. Describetheactuallocationoftheimagewithrespecttothemap.________________________________________________________________________________________________________________________________________________</p><p>o ClicktheFullExtentzoomtoolagain.</p><p>o ClicktheCustomizemenuthenselectToolbarsandverifythatGeoreferencingischecked.</p><p>o TheGeoreferencingtoolbar willappear.Dockittothetoolbararea.</p><p>SinceGeoreferencingtoolwillworkonRasterandimportableformats,whatwouldonlyappearontheLayerdropdownlististheSRP_01.jpg.</p><p>43</p></li><li><p>o ClickBookmarksmenuandselectSRPArea.</p><p>o ClicktheGeoreferencingdropdownmenuandclickFitToDisplay.</p><p>o ClickBookmarksmenuagainandselectRightMostPoint.Locateayellowcoloredcircleontheimagesimilartowhatisshownbelow.</p><p>o ZoomtoFullExtent.FromtheTableOfContents,movetheSRP_01.jpgaboveBrgysOfCebuCitylayer.</p><p>o ClickBookmarksagainandselectLeftMostPointtoviewtheleftmostpartoftheimageasshownbelow.</p><p>o Thistime,clicktheBookmarksmenuandclickSRPArea.Takenotethatforthisexercisereferencepointsareheldoutforyoutomakesurethatyouwillbeabletoeasilylocateit.</p><p>44</p></li><li><p>o PlacetheSRP_01.jpgbelowBrgysOfCebuCitylayeronceagain.</p><p>o SetthetransparencyofBrgysOfCebuCityto75%.Hint:RightclickonBrgysOfCebuCitylayerandclickProperties.ClicktheDisplaytabontheLayerPropertiesdialogboxandtype75ontheTransparentfield.</p><p>o ClickBookmarksmenuandselectLeftMostPoint.Besurethattheyellowdotontheimagewillbevisible,ifnecessaryzoominsomemore.</p><p>o OntheGeoreferencingtool,uncheckAutoAdjust(clicktheGeoreferencingdropdownmenu)andthenclicktheAddControlPointsbutton .Clickonthecenteroftheyellowdotandsettheotherendpointofthelineatanintersectingroadjustaboveit.Verifyyourresultthroughthefollowinggraphic.</p><p>o NowclicktheBookmarkmenuagainandselectRightMostPoint.o Clickonthecenteroftheyellowdotandsettheotherendpointofthelineatthetipofa</p><p>polygonshapeasshownbelow.</p><p>45</p></li><li><p>Thefirstprotrudingpolygononthisarea.</p><p>o ClicktheGeoreferencingdropdownmenuandclickUpdateDisplay.Note:IncaseyouwillhavesomemistakesinusingtheAddControlPoints,justopentheLink</p><p>TabledialogboxbyclickingtheViewLinkTable .OntheLinkTabledialogbox,youmaydeleteanyexistinglinksthatyouhavecreated.</p><p>6. WhathappenedtotheimageontheDataFrame(UsethePantool toexaminethemap)?________________________________________________________________________</p><p>o ClickUpdateGeoreferencingintheGeoreferencingtool.SaveyourmapasMyCebuCitySRPinyour..\MyGISOutputsfolder.</p><p>o RemovetheGeoreferencingtoolfromyourtoolbar.Hint:RightclickontheemptyareaofthetoolbarforthepopupmenutoappearanduncheckGeoreferencing.</p><p>CreatingaSpatialDatabysketchingtheaerialphotographThegeneraltermusedforanygeographiclayerwithinanyGISsoftwareisSpatialData.InArcMap10thisisspecificallycalledaFeatureClasswhileinolderArcGIS3itiscommonlyasShapefile.</p><p>o ClickontheCatalogtoolandlocateCebu_City_SRPgeodatabase..\LearnGIS2\CreatingandEditingSpatialDatafolder.whichisin</p><p>o RightclickonCebu_City_SRPgeodatabaseselectNewandthenclickFeatureClass.</p><p>46</p></li><li><p>o OntheNewFeatureClassdialogbox,typeSRP_RoadsontheNamefieldandthenselect</p><p>LineFeaturesunderType.ClickNexttocontinue.</p><p>o Forthecoordinatesystemselection,clickonImport.OntheBrowseforCoordinateSystemdialogboxlocateandselectBrgysOfCebuCityfeatureclasswhichislocatedin..\LearnGIS2\CreatingandEditingSpatialData\Cebu_City_SRPgeodatabasethenclickAdd.VerifythatPhilippines_Zone_IVwillappearintheNamefield.ClickNextthrice.</p><p>o UndertheFieldNamecolumn,onthethirdrowtypeRoad_NameandsettheDataTypeasTextthenclickonFinish.</p><p>SRP_RoadslayerisnowbeingaddedtotheTableOfContents,butthislayerisstillemptythereforewewillplacesomefeaturesintothislayer.</p><p>o RightclickontheemptyareaofthetoolbarandenabletheEditortool.DocktheEditortoolifnecessary.AlsoenabletheSnappingtoolanddockitifnecessary.</p><p>o ClicktheEditordropdownmenuandclickStartEditingasshownbelow.</p><p>o TheCreateFeaturesdockingwindownowappearedontherightsideofArcMap.SelecttheSRP_RoadsandontheConstructionToolsbesuretoselectLine.</p><p>o ZoomtotheareaneartheFortSanPedroneartheMalacaansaSugboandbegintracingthemajorroadfromthatpoint.BesurethatUseSnappingisunchecked.VerifythisinSnappingtool.</p><p>Whiledoingthetracingyoumightwanttopanorzoomthemapwithoutlosingthetracingmode.Youcandothatbyutilizingtheshortcutkeys.Inordertopanthemapwhileintracingmode,presstheCkeyandassoonasthecursorchangesintoahandsymbolwithoutreleasingtheCkeydragthemousetowhereyouwantthemaptobefocused.</p><p>Forthezoomingoperationwhileontracingmode,justpresstheZkeyanddragaboxaroundtheareayouwanttozoomin.Justusethemousescrollifyouwanttozoominoroutwithoutspecifyinganarea.</p><p>47</p></li><li><p>TospecifyanendtoasegmentjustclickonitandcontinuethetracinguntilyouarriveatthelocationoftheboundarybetweenTalisayandCebuCity.Wheneveryouarriveatthatpoint,rightclickandselectFinishSketchonthepopupmenu.Theroadshouldbemoreorlesslikelythesameasthefollowing.</p><p>o Whiletheroadishighlighted,opentheattributesbyclickingtheAttributesbuttonon</p><p>theEditortoolbar .OntheAttributesdockablewindow,settheRoad_NamefieldasCebuSouthCoastalRoad.</p><p>o Next,wewilltracetheSRPMambalingRoadwhichiscompletelyshownbelow.(NametheroadontheAttributeswindowasSRPMambalingRoad)</p><p>48</p></li><li><p>o ClickontheEditordropdownmenuandclickSaveEdits,thenStopEditing.</p><p>o SettheSRP_RoadssymbolcolortoYuccaYellow(row1,column5)anditsWidthto2.</p><p>ThistimewearegoingtocreatetheareawhichistheentireSRP.</p><p>o Usingwhatyoulearnincreatingnewfeatureclass,createapolygonfeatureclassandnameitasSRP_Area.Forthefields,justprovidethefollowing:</p><p>o FieldName:Area_NameDataType:Text</p><p>o Usingwhatyoulearnwhenyouauthoredtheroads,starteditingthefeatureclass.</p><p>7. OnCreateFeatureswindow,doestheSRP_Areafeatureclassappearonthelist?_____________________</p><p>FortheSRP_Areafeatureclasstoappear,youneedtocreateatemplateforit.</p><p>o ClickontheOrganizeTemplates ontheCreateFeatureswindow.</p><p>o OntheOrganizeFeatureTemplateswindow,selectSRP_AreaandselectNewTemplatethenclickFinishthenClose.</p><p>49</p></li><li><p>o OntheCreateFeatureswindow,selectSRP_AreaandontheConstructionToolsselectPolygonandtracetheboundaryoftheSRPartificialislandasshownbelowandsettheArea_NametoSRPArtificialIsland.</p><p>o Saveandstoptheediting.</p><p>o SetthesymbolcolorofSRP_AreatoVioletDust(row7,column10).</p><p>o OpentheSRP_Areasattributetable.</p><p>8. Howmuchistheareaofthecreatedpolygon?_______________________</p><p>WehavecreatedtheareaoftheSRPbutifyouhidetheSRP_Areaandviewtheimage,youwillobservethatthereisapondwithinthearea.WehavetoremoveaportionofourexistingpolygontomaketheexactreclaimedareaofSRPandmakethehallowarea.</p><p>o SettheSRP_Areatransparencyto30%.Hint:RightclickontheSRP_ArealayerintheTableOfContentsandselectProperties.ClickonDisplayifnecessary,andsetTransparentfieldto30thenclickOK.</p><p>o ClicktheEditordropdownmenuandStartEditing.</p><p>410</p></li><li><p>o OntheSnappingtoolbar,besuretoenableUsesnapping.MakesurethatthesnappingmodewillonlybeEndSnappingbyclickingonothersnappingmodestoremovethehighlightasshownbelow.</p><p>o SelecttheSRP_AreaontheCreateFeatureswindowandselectthepolygonarea(whichwillshowahighlightedpolygon)ontheDataFrameandfromtheEditortoolselectCut</p><p>PolygonsTool .</p><p>o Nowbegintracingtheareaofthepondandtoendthetracing,doubleclickonthestartingpointofthistrace.Refertothefigurebelowforverification.</p><p>o Currently,theSRPpolygonisalsoselected.NowclickonEditTool andselectthepondpolygonandpressthedeletekey.</p><p>o Saveandstopediting.</p><p>9. HowmuchistheareaoftheSRP_Areapolygonthistime?__________________</p><p>o RestorethetransparencyoftheBrgysOfCebuCityandSRP_Areabackto0andhideSRP_01.jpg</p><p>Thecorrectwayofconstructingthepolylineroadfeatureonintersectionsistocuttheroadonceitarrivedonanintersection.Crossingoflineswithinapolylinefeatureclassisincorrect,</p><p>411</p></li><li><p>inthefollowingstepwehavetoeditSRP_RoadwherewewillcorrectlysketchtheSRPMambalingCebuSouthCoastalintersection.</p><p>o OpentheSRP_Roadsattributetable.</p><p>10. HowmanyrecordsarethereintheSRP_Roads?______________</p><p>o Usingwhatyouhavelearnedineditinglayers,edittheSRP_Roads.</p><p>o SelecttheCebuSouthCoastalRoadandfromtheEditortoolbar,selectSplitTool .</p><p>o ClickontheintersectionbetweenSRPMambalingRoadandSouthCoastalRoad.</p><p>11. OnceagainviewtheSRP_Roadsattributetable.Howmanyrecordsarethere?___________</p><p>o Saveandstopyourediting.</p><p>o Updateyourmapdocument.Hint:ClickonFilemenuthenSave.</p><p>o Fromwhatyouhavelearnedinmaplayout(ie.Exercise#1),createamaplayoutfocusingontheSRPareaandexportitonaPDFfile.BesuretoenablethelabelsontheroadswithinSRP.IncludescalebarandscaletextaswellwithamaptitleCebuCitySouthRoadProperties.</p><p>Preparedby:Engr.JaniceB.Jamora,MEngandEngr.NoelT.Navasca,CompEDecember2012References:</p><p>1. ArcGISDesktopII:ToolandFunctionalitybyGEODATA,ESRI</p><p>412</p></li></ul>

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