processing schematic networks with arc toolbox

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1、ProcessingSchematicNetworkswithArcToolboxByTimWhiteaker7/6/03AbstractAtooliswrittentoprocesstheArcHydroschematicnetworkusingArcGIS9.0ArcToolboxtechnology.Bydefault,theprocessingperformsasimpleaccumulationroutineswithattributesontheschematicfeaturesinorderfromupstreamfeaturestodown

2、streamfeatures.However,morecomplexprocessingbehaviormaybeassociatedwiththetoolbycreatingDLLsthatserveasprocessingops.Asaresult,acertaindegreeofhydrologicmodelingmaybeperformedfromwithintheGIS.41TableofContentsAbstractiTableofContentsii1Introduction12Background22.1ArcHydroSchematic

3、Network22.2ArcToolbox9.042.3ScriptsandDLLs53Methodology63.1SchematicFeatures63.1.1SchematicNodes63.1.2SchematicLinks73.2SchematicValues73.2.1ReceivedValues83.2.2IncrementalValues83.2.3TotalValues93.2.4PassedValues93.3SchematicBehaviors103.3.1ReceivingBehavior103.3.2PassingBehavior

4、103.4ProcessingOrder114ProcedureofApplication124.1DataModel124.1.1SchematicNodeandSchematicLinkClasses124.1.2AttributesofSchematicFeatures124.2ProcessingProcedure134.2.1DataPreparation144.2.2TheProcessLoop154.3ImplementationwithArcToolbox184.3.1ProcessSchematicScriptTool194.3.2Pro

5、cSchematicScript224.3.3MBSchematicDLL234.3.4ProcessingOps235Results246Conclusions30AppendixA:Tutorials31A.1HowtoCreateaScriptTool31A.2HowtoCreateaProcessingOp37411IntroductionTheArcGISHydrodatamodel(ArcHydro)providesaframeworkfororganizingandpreprocessinggeospatialandtemporaldataf

6、oruseinhydrologicandhydraulicsimulationmodels.OneoftheproductscreatedbyArcHydroisaschematicnetwork,whichrepresentsconnectivitybetweenfeaturesinthelandscapethroughanetworkofnodesandlinks.ThispaperdescribesamethodologyforprocessingattributesofschematicnetworksusingArcGIS9.0ArcToolbo

7、xtechnology.Thenetworkisprocessedstartingwithupstreamfeaturesandmovingdownstream,sothatvaluesarepassedalongthenetwork.Theprocessassumesthatthenetworkisdendriticandthatnobackwatereffectsoccur.Thusforeachfeature,allinputsareprocessedandthenpassedaccordinglytothenextdownstreamfeature

8、.Thistypeofapplicationisusefulinr