Model Builder, Selection and Portability · Model Builder, Selection and Portability Our purpose...
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ESPM5295 Model Builder, Assignment 2 Model Builder, Selection and Portability Our purpose here is to develop more practice with model builder, and to automate portions of your workClow to ease multiple runs during your runoff mitigation development. There were three main “branches” in the example Clowchart provided earlier in the semester; one that calculated net rainfall (red, below), one that calculated inCiltration (green), and a third that calculated watersheds (blue below). While you may have opted for a different workClow that that embodied in this Clowchart, your approach will likely include something similar to the three branches. For example, a vector-only approach could duplicate these three branches, but substitute a set of overlays, calculations, and recodings for the raster conversions and raster algebra on the right side of this Clowchart. Your various model runs involve modifying inputs, e.g., canopy, building roof type or surface permabilities, or watershed pour points, and then re-running the analysis. This sort of repeat analysis could be greatly eased by models which allow you to change those inputs, but run the same model steps in a more or less automated fashion. Your Previous Model Builder assignment incorporated the watershed branch into a model. Your assignment this week is to write models for some version of the net rainfall branch and the inCiltration branch.
Transcript of Model Builder, Selection and Portability · Model Builder, Selection and Portability Our purpose...
ESPM5295 ModelBuilder,Assignment2
ModelBuilder,SelectionandPortabilityOurpurposehereistodevelopmorepracticewithmodelbuilder,andtoautomateportionsofyourworkClowtoeasemultiplerunsduringyourrunoffmitigationdevelopment.
Therewerethreemain“branches”intheexampleClowchartprovidedearlierinthesemester;onethatcalculatednetrainfall(red,below),onethatcalculatedinCiltration(green),andathirdthatcalculatedwatersheds(bluebelow).
WhileyoumayhaveoptedforadifferentworkClowthatthatembodiedinthisClowchart,yourapproachwilllikelyincludesomethingsimilartothethreebranches.Forexample,avector-onlyapproachcouldduplicatethesethreebranches,butsubstituteasetofoverlays,calculations,andrecodingsfortherasterconversionsandrasteralgebraontherightsideofthisClowchart.
Yourvariousmodelrunsinvolvemodifyinginputs,e.g.,canopy,buildingrooftypeorsurfacepermabilities,orwatershedpourpoints,andthenre-runningtheanalysis.
Thissortofrepeatanalysiscouldbegreatlyeasedbymodelswhichallowyoutochangethoseinputs,butrunthesamemodelstepsinamoreorlessautomatedfashion.
YourPreviousModelBuilderassignmentincorporatedthewatershedbranchintoamodel.
YourassignmentthisweekistowritemodelsforsomeversionofthenetrainfallbranchandtheinCiltrationbranch.
ESPM5295 ModelBuilder,Assignment2
In5iltrationBranchExampleTheobjectiveofthismodelistocreatealayerwithacolumnformaximuminCiltrationsrates,combiningbuildings,impervioussurface,andsoilslayers.
Inourproblem,itislikelywewillmodifyourpervioussurfacelayer,changingsomeoftheimpervioussurfacestopervioussurfaces,andmodifytheoriginalbuildingslayer,convertingsomeoftheClatroofstogreenroofs.
Therefore,wewantatleastthebuildingsandperviousnesslayersasaparameterthatcanbechangedwitheachrun.
Afewstartingassumptions:First,Iwon’tbemodifyingtheinitialsoilslayerbetweenmodelruns.I’llmakeitaparameter,becausethatprovidesmoreClexibilityforyourmaininputdata,butIdon’tneedto,socouldleaveitasaCixeddatasetsinceIwon’tbechanginganysoilspolygonsortabledatabetweenruns.Alsonotethatthesoilsdatahasalreadybeenclipped(belowleft),andapropertableitemforthemaximuminCiltrationratesforunderlyingsoilscreatedandwiththepropervalues,namedSoil_InCl,asshowninthetableatright.Thereareothercolumnsinthetable,hiddeninthisview.TheBuildingFootprintslayershasacolumnlistingrooftype.
IassumethemodiCiedbuildingfootprintslayerhasassignedaRoofvalueof“Green”fortheClatroofsconvertedtogreenroofs.
ESPM5295 ModelBuilder,Assignment2
ThelayerPerviousnesscontainsaCieldthatidentiCiesimpervioussurfaces:
OuroriginalClowchartshowedthebranchassomethinglikethis:
TheoriginalClowchartshowedusunioningthePerviousandBuildingFootprintslayer,herecalledBldPrv.However,asyou’vediscoveredinyouranalysis,thisunionresultsinanullorunassignedvaluesfortheTYPEcolumn,thevariablethatrecordsperviousstatus,forbuildingpolygonsintheunionoutput.ItalsoresultedinnullorunassignedoutputfortheRoofvalueinthepolygonsfromtheperviousnesslayer(seearrows,belowright).These
WeneedtoCixthis,aswewanttorecordthestatusofthesurfaceintoonecolumn.
ESPM5295 ModelBuilder,Assignment2
Here,I’llchoosetorecordtheroof’simperviousstatusintotheTYPEcolumn,touseinfurtherprocessing.Ineedtoassign“Impervious”totheTypecolumnforthepolygonswithpitchedorClatroofs,and“Pervious”totheTYPEcolumnforbuildingswithGreenroofs.
Whenprocessingmanually,youwouldmostlikelydothiswithaSelectbyAttributestool,andthenaCalculateFieldtool.Thissequencedoesn’tworkinModelBuilder,becausethecalculateCieldtool,whendonemanually,onlyoperatesonaselectedset,ifthereisone.ModelBuilderdoesn’tdothis.
Fortunately,wecanusesyntaxwithintheCalculateFieldtooltoselectwhilecalculating.
Ibuildmymodelbydraggingandconnectingtheappropriateinputsandcommand:IthenopentheCalculateFieldbubbleonmymodelcanvas,andindicatethe
ESPM5295 ModelBuilder,Assignment2
InputTable,FieldI’llbemodifying,enteringanexpressioninthewindowatthebottom.
TakecaretonotethatthisisanArcadeExpressionType(seearrowatright)
ThewindowatthebottomshowstheexpressionassignedtoTYPE.
Thisisaselection/assignment,withtheWhen(partsignifyingtheconditionalassignment.
The$feature.indicatesthatwewanttocyclethroughallthefeaturesintheinputtable.Thencomesthecondition;theCirstline$feature.TYPE==“Impervious”,“Impervious”,
isinterpretedas:whereveryouCindaTYPEvalueofImpervious,assignitavalueofImpervious.
Thecleverpartsstartatthethirdline,with$feature.Roof==“FLAT”,“Impervious”,
ThisallowsustoassignaTYPEvalueofImperviouswhenevertheRoofisFLAT.
Therestoftheexpressionissimilar,assigningvaluesbasedonasetofconditions.NotethatthereisaCinal“NotAssigned”Clag,ifnoneofourconditionsapplytoafeature.Alsonotethecommasfollowingeachcondition,andthegeneralsyntax.ModelBuilderisprettyunforgivingforerrorsinformatorcontent.
AfterrunningtheCalculateFieldcommand,IcheckandnotethattheTYPEcolumniscorrectlyassignedformypolygonsthatcamefromtheBuildingFootprintslayer,butarenowpartofmyunionedperviousnesslayer:
ESPM5295 ModelBuilder,Assignment2
OurClowchartshowsthenextstepasaunionofsoilswithourbuildingsandpreviouslayer:
WhenimplementedinModelBuilder,itlookssomethinglikethis:
ESPM5295 ModelBuilder,Assignment2
Afterrunningtheabovemodel,thetablefortheoutputcombinedsoils/buildings/perviousnesslayerlookssomethinglikethis,below:
Itisclosetowhatwewant,inthatwehaveourvarioustypescombined.However,theinCiltrationofimpervioussurfacesshouldbesettozero,astheyareimpervious.
Inaddition,theinCiltrationforgreenroofsshouldbesettotheirmaximumvalue.
Itisperhapssafesttocreateanewcolumn,andcalculatethemaximuminCiltrationintothatcolumn.IcandragtheAddFieldoperationontotheModelBuilderCanvas,andspecifytheinput,anewCieldandtype(InameditMaxIn5l,typedouble,precision12andscale5).
IcanthenuseCalculateFieldandaWhenconditionalassignmenttoassignthepropervaluestomyMaxInClvariable.ImightcreateanArcadeassignmentequationsomethinglikethis:
Rememberinthissyntax,itcheckseachrow,andifitisimpervious,itassignsandinCiltrationofzero.MypreviousprocessingensuresthisconvertsboththeimperviousroofsandlandsurfacetozeroinCiltration.ButsinceIhaven’tsetaninCiltrationrateforgreenroofs,Ineedtodothatnow(NotethattheCigureshouldread0.05ratherthan0.5forGreenroofs).Therestofthepolygonsareprevious,andgettheunderlyingsoilinCiltrationrates.
ESPM5295 ModelBuilder,Assignment2
ThereisonewrinklethatwemightCinddisconcerting.IfIlookattheinputtable,therearetwocolumnsnamedtype:
HowcanIbesurethatmyselectionwillworkonthecorrectcolumn.InthiscaseIwanttousetheleftTYPEcolumn,whichcontainsimperviousness,andnottheright,withcomesfromsoiltypes.
Nottoworry,Iamonlylookingatanalias.IfIopentheFieldsviewonthetable(rightclickonanycolumnandselectFields,nearthebottomofthedropdown),Iseethatthecolumnshavedistinctnames,TYPEandTYPE_1.TheUnioncommandcreatesthesedistinctFieldNames,andassignsaliases.TheArcadeexpressionreferencestheFieldNames,andnotthealiases.
ESPM5295 ModelBuilder,Assignment2
MyModelwillnowlooksomethinglikethis:
OnceIvalidate,run,andverifythemodel,IcannowcalculateanewmaximuminCiltrationlayerafteranymodiCicationoftheinputs.InthiscaseIcouldchangetheperviousnesstoconvertsomeofmyroadsorsidewalkstoperviouspavement,andchangeabuildingtohaveagreenroof,andthenre-runmymodelfairlysimply.Thiswouldgreatlyspeediterationthroughmymitigationdevelopment.
Ifthiswereastand-alonemodel,Iwouldprobablywanttomaketheoutputaparameter.However,thegoalistocreatealargermodelthatincorporatesmyentireworkClow.
OnceI’vecompletedthis“branch”ofmyoverallmodel,I’llhavetwoofmythreemainbranchescodiCiedinModelBuilder.Icouldthenmakeafullmodelbycompletingthethirdbranch,andafterdebugging,combineallthreebrancheswithan“overlay”ofsortsofthethreebranchlayers,eitherthroughconversion/rastercalculatororvectorunion/recode,andthentorasterorvectoraggregationfunctions.
ESPM5295 ModelBuilder,Assignment2
MakingaModelFlexibleYoumightnoticethatwhenyousaveamodel,theCilereferencesaresettotheinputvaluesyouusedwhendebugging,e.g.,ifaninputCilewasintheC:\users\classdatadirectory,withthename“elev_rast.tif,”thenthatwillbeincludedinthemodelspeciCicationwhenyousaveit.
Ifyouwanttousethemodelondifferentdata,inadifferentdirectory,youmayrunintoproblems,becausethemodelwilllookforexactlythesedata,inthespeciCieddirectory,whenyouwishtorunit.
Oneoptionistospecifyallinputandoutputdatasetsasparameters.Thismayworkinsomeinstances,butinothers,youmaynotwishtohavetospecifyalltheinputs.Inaddition,ifthereareintermediatedatasets,youdon’twanttohavetospecifyallofthem.
Acommonapproachistotakeadvantageofinlinesubstitution.Anytimeyouenclosetextin%symbols,themodelwillsubstituteaworkspacevariabledeCinedforthattext.Forexample,intheCigurebelow,mybasedataarestoredinageodatabasenamedData.gdb.IdeCineaworkspacedatalocationwiththenameDataWorkspace,andavalueofC:\Data.gdb.IfIplacethetoken%DataWorkspace%inmyModelBuildercode,itwillsubstitutethevalue,C:\Data.gdbwhenrunningthemodel.InthiswayIcanspecifyadifferentpathanddatasetformyinput.NotethatthedatasetsthemselvesmusthavethesamenamesasspeciCiedinthemodel,e.g.,Roads,Projected,intheexamplebelow.Icouldmakethesevariablesthatoneenterswhenrunningthemodel.
Inlinesubstitutionisoftenusedtoallowforworkingondifferentcomputers,wherethepathstoacommondatasetmaybedifferent.Itisalsooftenusedtospecifythescratch,orworkingdirectory,whereintermediatedataarestored.InlinesubstitutioncanmakeyourmodelsmuchmoreClexible.
Youwanttooptimizehowyoudivideinputsbetweenparametersandinlinesubstitution.Ifyouarealwaysworkinginthesameproject/database,onthesamecomputer,thenyouprobablydon’twanttomaketheselocationsasinlinesubstitutes.You’reenteringthesamethingswitheachrun,wastingtime.
Youlikelywanttouseinlinesubstitutionfortheworkingdirectories/paths,butnotmakethemparameters,ifyouswitchbetweenlocationsoften,butusethesame
ESPM5295 ModelBuilder,Assignment2
geodatabasedandCiles.Forexample,ifyouworkissplitmainlyintheSkok35labandahomeorofCicecomputer,you’lllikelyhavedifferentpathstoyourdataandscratchworkspacesonthetwodifferentcomputers,butusethesamegeodatabaseanddatalayernames.Youdon’twanttoaddinlinesubstitutionvariablesormostoftheinputfeatureclassesasparameters,becauseyou’llhavetoenterthemwitheachrun.Rather,youwoulduseinlinesubstitution,andeditthemodeltosetthedataorworkspacevariablesforthemodeloneachcomputer.Aslongasthedatausethesamenamingconvention,youcanmoveupdateddatabackandforth.Eachtimeyouswitchbetweencomputers,youcanjusteditthemodelonce,tomodifythevariableforyourdataworkspaceandyourscratchworkspace,andthendoyourruns.
Ifyouarechangingadatalayer,e.g.,addingpourpoints,youmaywishtomakethataparameter,andprobablynotaninlinesubstitution.Onlythosevalueswhichyouwhichtochangeregularlybetweenrunsshouldbeparameters.Acoupleofothernotesoninlinesubstitution:• Youshouldaddinlinesubstitutionvariablesafteryouhavewritten/debugged
yourmodel,atleastwhilelearning.TheValidate/RunsometimestripsupontheinlinesubstitutionwithintheModelBuilderEditor,eventhoughthemodelworksinamodelrunfromatoolbox.Yougetodderrorwarnings,sowhileyou’relearning,youthinkyou’vedonesomethingwrong,whensometimesyouhaven’t.
• Bepreparedforsomeofyourdataandoperationstobegreyedout,seeminglyincomplete,whenyouuseinlinesubstitutionvaluesasparameters.Theprogramdoesn’tknowwhattheyareuntilruntime,soitwilltellyouthatinputsareundeCinedorincorrect,forexample,sayingadatasetdoesn’texistbecauseadataworkspace(geodatabase)isavariable,deCinedatruntime.
• SometoolvaluesneedtobedeCinedasparameterswhenyouuseinlinesubstitutionthatdon’tneedtobeparameterswhenyouhard-wirethedatasource.Forexample,apourpointCieldhastobespeciCiedwhensnappingpourpoints.IfyoubuildyourmodelandindicateaCixedinputlayer,youhavetheopportunitytoalsoidentifythecolumnusedforidentiCication.IfyouhavethepourpointinputlayerdeCinedaspartofaninlinesubstitution,ModelBuilderdoesn’tknowwhatvaluesmightbeavailable,soitremainsundeCined.YouhavetosetitasaparametersoitcanbespeciCiedatruntime,oncetheinputdatalayerisknown.
Belowisamodelthatcontainsinlinesubstitution,and(perhapstoo)manyparametersfortheinputsandoutputs.ICirstcreatedthismodelasshownearlier,withoutanyinlinesubstitution,veriCieditworked,andthenintroducedvariablesforaninputdatabase(DataGDB)andscratchworkspace(ScratchGDB).This“broke”someofthepieces,andsoIhadtomodifythemodelabit,addingthepourpointCieldasaparameters.Thismodelassumeswe’llbemovingourmaindatabetweencomputers,andmostlymodifyingourpourpointlayerinthisbranch,asweaddnewraingardensforourproject.Thismeanswe’realwaysusingthesameinputDEM,soitdoesn’tneedtobeaparameter,andthatI’llbeworkingwiththeoutputvectorwatershedpolygons,soIdon’tneedtospecifytheoutputrasterwatershedsasa
ESPM5295 ModelBuilder,Assignment2
parameter.DifferentworkClowswouldlikelyhavedifferentmixesofparametersandinlinesubstitution.
IfIrightclickandopentheInputDEMbubble,IseethefollowingCigure:
Itshowsthatwe’reaccessingourstudyareaDEM,withthedatapathpre-pended.WhenIsetthisasaparameterduringamodelrun,itwillsubstitutethepathintothe%DataGDB%part.
ESPM5295 ModelBuilder,Assignment2
IfIhoverthecursoroveranoperation,itwilltemporarilydisplaytheinputvariables,herefortheFlowDirectionoperation:
Youcanseethattheinlinesubstitutionisinplaceforbothmyinputandoutputdatalayers.
Inthisinstance,IdecidedIdon’twanttosavemysnappedpourpointstomymaindatageodatabase,butrathertothescratchgeodatabase.Icouldhavedonethisforanyoftheintermediatelayers,itjustdependsonwhatIwanttosavewhere.IspeciCiedthisbyOpeningandtypingtheinlinevariable,%ScratchGDB%\SnapPPwhenspecifyingtheoutput,anditrecordedthatintothemodel.HoveringovertheSnapPPbubbleshowsthis:
OnceI’vespeciCiedtheinlineandparametervariables,Isavethemodel,andthenrunitfromtheCatalogToolbox.
ESPM5295 ModelBuilder,Assignment2
Yourassignment:Create2models(ofbothbranchesinthesamemodel),thatcalculate1. thepervious/building/soilcombinationbranchdescribedabove,appropriateto
yourworkClow,and,2. thecreationofanetrainfalllayer.Thissecondmodelwillbeabitmore
complicated,inthatIwantyoutostartwiththeinputPOINTSforyournewcanopyasoneofthelayers,asaparameter,alongwithyourexistingcanopy,buildingslayer,andgrossrainfalllayer(2.5or5cm)asinputs.Yourmodelneedsto
• bufferthepoints(perhapsbasedoncanopytype),• thenunionthenewcanopywiththeexistingcanopy• theneraseoutthecurrentbuildingsandcurrentcanopyfromyour
bufferednewcanopy(tocreateanewlayerthatallowsyoutocalculatecostofthenewcanopyareaonly)
• assignrainfallinterceptiontotheexpandedcanopylayer,• calculatenetrainfallfromthegrossrainfallpluscanopyinterception.
Turninpdfsofthemodelbuildergraphic,andthemodelsthemselves,intotheCanvassite.
