简介：Spatialdata,includinggeometricaldata,attributedata,imagedataandDEMdata,arehugeinvolumeandrelationsamongthemarecomplex.HowtoeffectivelyorganizeandmanagethosedataisanimportantprobleminGIS.SeveralproblemsaboutspacedataorganizationandmanagementinGeoStarwhichisabasicGISsoftwaremadeinChinaarediscussedinthispaper.Thepaperemphasizesonobjectmodelofspatialvector,dataorganization,datamanagementandhowtorealizethegoal,andthelike.

简介：Coastallowlandshavelargeareasofhazardimpactandrelativelylowcapacityofpreventiontothewaterrelatedhazards,whichhavebeenindicatedbythewide-spreadfloodhazards,highpercentagesoflandwithhighfloodvulnerability.Increasingpopulationpressureandtheshiftofresourcesexploitationfromlandtoseawillforcemoreandmorecoastallowlandstobedevelopedinthefuture,furtherenhancingthedangerofwater-relatedhazards.Inthispaper,thecoastallowlandsinthenorthernJiangsuprovince,China,wereselectedasacasestudy.TheInterpretationStructuralModel(ISM)wasemployedtoanalyzethedirectandindirectimpactsamongtheelementswithinthesystem,andthereby,toidentifythecausalelements,middlelinkages,theirexpressions,andrelations.

简介：Aregionalgroundwatermanagementsystemhasbeenelaborated,integratingRelationalDatabaseManagementSystem(RDBMS)andvariouswebservices.Itconsistsofwebgeospatialapplicationso-calledHydrIS(HydrogeologicalInformationSystem)basedonOpenSourcecomponentsandtechnologies,leadingtoafeasibleandlow-costsolution.Therefore,HydrISpermitsdeliveryofdatafromanumberofheterogeneoussourcestostandardssupportedbytheOpenGeospatialConsortium(OGC).TheprotocolsusedforexchangingdataarealsoderivedfromOGCstandards,i.e.,WMS(WebMappingService),WFS(WebFeatureService),andWCS(WebCoverageService).Finally,ageoportalwasdeveloped,whichconsistsofclient-applicationsthatcommunicatewithdifferentWebServices(WMS,WCS,anAdWprFoSto)ttyhpreoufogrhwHeTbT-Pb-aresqeudeGstISs.applicationwasdesignedusingthedeegreeFrameworktoprovidesystematicinterfacesandfunctions.Thissystemwasdevelopedtodemonstratethevalueofmakinghydrogeologicaldatamorewidelyaccessiblethroughclient/serverarchitecture.Thisexperienceandknowledgealreadygainedinthisprojectwillbeasourcefortechnologytransferandpolicydecisions.Otherwise,thiswillenableusergroupstoimprovethemanagementoftheirground-waterresourcesandcontributetoenhanceddecisionsupportcapabilities.

简介：AnOracle8i-basedap-proachisproposedtomanagetheinte-grateddatabasesoflargeCyberCity.Thisapproachconsistsofthreeisdesignedtoacceleratespatialretrieving,inwhichtheboundingboxesoflocalregionshavenointersectionandallleafnodesoftheR+-tree(geome-tryrecords)havenorepetition;rithmsareadoptedtocompressthedigitalelevationmodels,3Dvectormodelsandimages,suchasLZ77losslesscompressionalgorithmforcompressionofvectordataandJPEGcompressionalgorithmsfortextureim-Oracle8idatabase,aCyberCityGISspatialdatabaseengine(SDE)isdesigned.OnthebasisofthisSDEpro-totypeacasestudyisdone.

简介：Thispaperpresentsacomponentobjectmodel(COM)basedframeworkformanaging,analyzingandvisualizingmassivemulti-scaledigitalelevationmodels(DEMs).Theframeworkconsistsofadatamanagementcomponent(DMC),whichisbasedonRDBMS/ORDBMS,adataanalysiscomponent(DAC)andadatarendercomponent(DRC).DMCcanmanagemassivemulti-scaledataexpressedatvariousreferenceframeswithinapyramiddatabaseandcansupportfastaccesstodataatvariableresolution.DACintegratesmanyusefulappliedanalyticfunctionswhoseresuitscanbeoverlaidwiththe3DscenerenderedbyDRC.DRCprovidesviewdependentdatapagingwiththesupportoftheunderlyingDMCandorganizesthepotentialvisibledataatdifferentlevelsintorendering.