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1、StaticandDynamicDataLayersByDavidR.MaidmentCenterforResearchinWaterResourcesUniversityofTexasatAustin7February,2008Inworkingwithwaterresourcesdataandproblems,wehavetwobasicthingswehavetodo–todescribewaterproperties,suchasflow,velocity,waterlevelandwaterquality,andtodescribethewateren
2、vironment,suchasstreams,rivers,landscapes,aquifers,andcities.Theinteractionofwaterpropertiesandthewaterenvironmentisverycomplexandcanbedescribedonlyforsimplifiedcases.Wedothisbydefininghydrologicsystemsusingtheconceptofacontrolvolumetoisolateaparticularregionofspaceanddefiningitsinpu
3、ts,outputsandrelevantinteriorwaterproperties.Tocapturealltheinformationneededtodescribeahydrologicsystem,weneedseveralbasicsourcesofinformation:pointobservationsofwaterinformation,likestreamgages,waterqualitysamplingsites,groundwaterwells,andweatherandclimatestations;remotesensingobs
4、ervations,suchasNexradandsatelliteandaircraftremotesensing;GISdatasuchasDEM’s,watershedboundaries,streamnetworks,soilandlandcoverproperties,groundwaterwellsandaquifers;andhydrologicandweathermodelinformation,suchasoutputsfromNARRfortime-varyingweatherandclimate,oroutputsofHec-RASforf
5、loodplainmapping.IaminthemidstofcompletingthedesignforArcHydroIIwhichisacustomizedversionofArcGISforwaterresourcesforwhichIproposedandpublishedaninitialdesignin2002.IsuggestforArcHydroII,thatweshouldadoptthefollowingprinciples: (1) MakethestructureofArcHydroIIconformalwithwaterwebser
6、vices. InitiallythismeansmaketheTimeSeriespartofArcHydroIIconformalwithWaterMLsothatAHIIcanact: (a)asatargetfordataacquiredthroughwebservices(inthe caseofAHIIimplementedonArcGISDesktopandfunctioningasalocaldataharvester--wehaveanapplicationbuiltforthisalready); (b)asasourcefortimese
7、riesdatarelatedtogeographicfeatures(inthesenseofAHIIimplementedonArcGISServer). Idon'tthinkitsnecessarythatAHIIbeafullobservationsdatarepositorybecausewealreadyhaveCUAHSIODMforthat(andthereareothersystems,likeKisters,NWIS,etcthatalsoactassourcesofobservationsdata). 3(2) Adoptaconcep
8、tofstaticand