Download - Advanced Geoprocessing and ModelBuilder Conceptspeople.tamu.edu/~alawing/materials/ESSM462/ModelBuilder2.pdf · Advanced Geoprocessing and ModelBuilder Concepts A. Michelle Lawing

ESSM/GEOG462:AdvancedGISEcosystemScienceandManagement|TexasA&MUniversity(c)2015,A.MichelleLawing

AdvancedGeoprocessingandModelBuilderConcepts

A.MichelleLawingEcosystemScienceandManagementTexasA&MUniversityCollegeStaPon,[email protected]


Announcements

•  OPTIONAL:ReviseandresubmityourProposal!Oneweek–yougetuptohalfthepointsbackthatyoulost.

•  Dr.Smithiscomingnextweek(Nov.10th)tolectureaboutArcGISOnline.

•  EstablishyourArcGISOnlineloginUsername:email_tamuPassword:password1


ModelBuilder

•  NowyouhavehadsomepracPcewithModelBuilder

•  TodaywewilltalkaboutsomeadvancedprocessingopPons

•  Thesearecommontoolsusedinanygeoprocessingframework


ManagingIntermediateData

•  GISanalysiscangetmessy•  Mostofthetoolsthatyourunproduceanoutputdataset

•  Whenyouchainmanytoolstogetherthosedatasetsstartpilingup

•  It'seasytowindupwithafolderfullofdatasetswithnameslikebuffers1,clippedbuffers1,intersectedandclippedbuffers1,raster2reclassified,etc.



•  Inmostcases,youareconcernedwithjustthefinaloutputdataset

•  Intermediatedataarejusttemporary•  Youonlyneedtokeepitaroundtorunthemodel,andthenitcanbedeleted

•  ModelBuildercanmanageyourintermediatedataforyou



•  ModelBuilderwillplaceintermediatedatainatemporarydirectorycalledthescratchworkspace

•  ThescratchworkspaceisyouroperaPngsystem'stempdirectory

•  YoucanconfigureittoexistinanotherlocaPon



•  Youcanforcedatatogointothescratchworkspacebyusingthe%SCRATCHWORKSPACE%variableinthepath

•  Forexample:%SCRATCHWORKSPACE%\myOutput.shp



•  YoucanalsomarkanyelementinModelBuilderasIntermediateanditwillbedeletedakerthemodelisrun

•  Bydefault,allderiveddataareIntermediatedata


LoopinginModelBuilder

•  Looping,oriteraPon,istheactofrepeaPngaprocess

•  Amainbenefitofcomputersistheirabilitytoquicklyrepeattasksthatwouldotherwisebemundane,cumbersome,orerror-proneforahumantorepeatandrecord

•  Loopingisakeyconceptincomputerprogrammingandyouwilluseitokeningeoprocessing



•  ModelBuildercontainsanumberofelementscalledIteratorsthatcandoloopinginvariousways

•  Thenamesoftheseiterators,suchasForandWhileactuallymimicthetypesofloopingthatyoucanprograminPythonandotherlanguages



Iterator:For

DescripPon:IteratesoverastarPngandendingvaluebyagivenvalue.



Iterator:While

DescripPon:Executes"while"acondiPonistrueorfalsefortheinputorsetofinputs



•  IterateFeatureSelecPon-Iteratesoverfeaturesinafeatureclass

•  IterateRowSelecPon-Iteratesoverrowsinatable•  IterateFieldValues-Iteratesovereachvalueinafield

•  IterateMulPvalue-Iteratesoveralistofvalues•  IterateDatasets-IteratesoverdatasetsinaWorkspaceorFeatureDataset



•  IterateFeatureClasses-IteratesoverfeatureclassesinaWorkspaceorFeatureDataset

•  IterateFiles-Iteratesoverfilesinafolder•  IterateRasters-IteratesoverrastersinaWorkspaceoraRasterCatalog

•  IterateTables-Iteratesovertablesinaworkspace•  IterateWorkspaces-Iteratesoverworkspacesinafolder


UnderstandinganIterator

•  Eachiteratorhasasetofparametersthatmaydifferfromtheotheriterators

•  Theoverallstructureofalliteratortoolsisverysimilar



•  IterateFeatureClassesrequiresanInputWorkspacewhereallthefeatureclassestoiteratethrougharestored



•  WildcardandFeatureTypeareusedtorestrictwhatfeatureclassesintheworkspaceareiterated



•  Wildcardlimitsthefeatureclassesbytheirnames•  FeatureTypelimitsthefeatureclassesbytheirfeaturetypes



•  RecursiveisusedtocontroltheiteraPonoverfeatureclasseswithinsubfoldersintheworkspace



•  IterateFeatureClasseshastwooutputvariables:theoutputfeatureclassandthenameofthefeatureclass



•  Theoutputfeatureclasscanbeconnectedtothenexttoolforprocessing



•  NamecanbeusedforinlinevariablesubsPtuPon



•  Forexample,iftheBuffertoolwasaddedtothemodel,andtheFeatureClassvariablewasconnectedtothetool,everyfeatureclassintheworkspacewouldbebuffered


Notes

•  Onlyoneiteratorcanbeusedpermodel.•  TheopPonstoaddanotheriteratorwillbedisabledifoneiteratorexistsinthemodel.

•  Ifaniteratorisaddedtoamodel,alltoolsinthemodeliterateforeachvalueintheiterator.

•  Ifyoudonotwanttoruneachtoolinthemodelforeachiteratedvalue,createasubmodel/modelwithinamodelthatcontainsonlytheiteratorandadditasamodeltoolintothemainmodel.


Notes

•  IfamodelcontaininganiteratorisexportedtoaPythonscript,thescriptwillnotincludetheitera1onlogic.

•  PythonlisPnglogiccanbeaddedtothescripttoachieveasimilareffect.


ExampleusinganIterator

WewillusetheIterateFeatureClassesiteratorto1.  Projecteveryfeatureclassinaworkspace2.  NameeachProjecttooloutputdynamicallybased

ontheinputnameusinginlinevariablesubs1tu1on

3.  Addanewfieldtoeachfeatureclass.



•  AninputworkspaceisspecifiedforIterateFeatureClassestoiteratethrougheveryfeatureclassinthatworkspace.



•  Featureclassestoiteratethrougharerestrictedbyspecifyingawildcardandfeaturetype(onlypolygonfeatureclasseswithwithIwillbeiteratedthrough)



•  IterateFeatureClassesproducestwooutputs:thefeatureclassiteratedthroughandthenameofthefeatureclass



•  ThefeatureclassvariableisconnectedastheinputtotheProjecttool


ExampleusinganIterator•  ThefeatureclassnamevariableisusedforinlinevariablesubsPtuPontodynamicallynameeachoutputfromtheProjecttoolwiththesamenameoftheinputfeatureclass


ExampleusinganIterator•  AnewfieldisaddedtoeveryfeatureclassbyconnecPngtheAddFieldtool.


AccessingIteratorsinModelBuilder

•  Insertmenu-ClickInsert>Iteratorsandchooseaniteratortoaddtothemodel

•  Shortcutmenu-Right-clickinopenspaceinthemodel,clickIterators,thenchoosetheiteratortoaddtothemodel

Download - Advanced Geoprocessing and ModelBuilder Conceptspeople.tamu.edu/~alawing/materials/ESSM462/ModelBuilder2.pdf · Advanced Geoprocessing and ModelBuilder Concepts A. Michelle Lawing

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