OminaisuudetSpatialDatabase
1.Theatotofdataishuge.
SpatialDatabasesareorientedTogeography andRelateObjects, andInTheobjectiveWorldTheyareofteninVolveDintheearth'surfaceInformation, geologinen tieto, ilmakehän tiedot jne..andtheRirkplexfenomena jacration, sothetadescribingThisInformationHasalargeCapecity, yleensä.
2.Erittäin hyväksyttävä.
SpatialInformationsStemsRequirePoweralInformationretrievalandanalysisCapability, WhatareBasedonSpatialDatabasesAndRequireEffipectiveAccessTolargeaNountSofData.
3.Thespatialdatamodeliscomplex
ThespatialDatabasedoesNotSToreDataFasinglenature, ButCoversalosimostAllDataTypeSrelatedTogeografia.ThesedatypescanbedividedInType3:
(1) Attributedata: Periaatteessa.
(2).
(3) SpatialRelationalData: StorageofologicalRelationalData, yleensä CombbindWithgraphicalData.
4.JointManagementOfattributedataandSpatialData.
5.TheatributedataandSpatialDataOfSpatialtentiesCanchangeacordingyovertime.
6.ThelengthOfTaTaiMofSpatialDataisVariable, ConcensOnOrmoreObjects, AndrequiresnestRecords.
7.OnefeaUreTypecorresponseAtributedAtAbleFile.MultipheareTytypessHareoneatTributeDatedFile.
8.ITHASSPATIALMULTI-SCALEANDTIMEMULTI-TYÖ.
9.Laajempi.
SpatialDatabase
SpatialDatabase
DatabaseshaveVariousorganizationsDueToDifferEntiplicationRequirmentsForm.ThedesignofthedatabaseistoDeterMinetheoptimaldatamodeli, prosessointi-, storagestructure, andAccessMethodinagiviranciactionEnvironmentAccordingToDifferentApplicationPurPosesanUserRequirens.TheconnectionbetweenthemsisfiesUserRequirementsandCanbeacceptedbyAcureDBMS.Atthesametime, itcanachievesystetemGoalsandEffecciveSaccessandmanageAdatabases.Iske.
ThedesignofaspatialDatabasereferstoheteReprocessofestablishingaspatialDatabaseontheBasisofaDataBaseManagementSystem.ITMAINYLINCLUNESTHREEPARTS: VAPAUTUSANALYYSI, STRENCOUROUDESIGN JA DADATALAYERDESIGN.
1.Epävarma
Vaatimustenalyysi,.ThaiAntaSksareasfollows:
1)Investigateuserneeds:
Ymmärre.
2)Collectionandanalysisofdemanddata:
Mukaan lukien.
3)Prepareuserrequirementsspecification:
Sisältää vaatimukset, että määrät, tehtävät, spesifiset laitosten tiedot, systemfunctionsandpermorance, operateAnvironment jne.., yesthefinalresultHeneedsanalyysi.
VaatimustenalyysiSaHighlyTeknicalwork, joka olisi täydennetty huomautukseksi.Atthesametime,.
CompletetherequirementsanalysisstageSelectionofdatasourcesandevaluationofvariousdatasets
2StructuralDesign
refertispatialDataStructuredesign, theresultisareavuSpatialDatamodeli, joka onKeyToSpatialDatabasedesign.TheorethespatialDatamadelCanReflectTherealWorld, TheBetterthApplicationsysteemgeneratedOnThisBasiscanMeetTheDataprocessingRequirementsofusers.
TheessenceSpatialDatabedesignistheprocessOfexpressinggepatialentiesInADatabaseSysteminacetortOrgAnizationalForm, jonka mukaan.
1) ConceptualDesign
Konseptuaalisesti.Malli.
Erityisesti ItanalyzesandorganizestheinformationAndDataCollectedIntHedemanDanalystage, määrittelygeografiancentiteetti, ominaisuudet ja ympäröivät jagesthePartialViewSofeachuserIntoAgeneralGlobalView.FormaconceptualModelThatisIciveveceftheComputerandReflectsTheUser'spointOfView.TheconceptualModelHasnothingTowiththSpesificdBMS, theStructureisstable, jaScanbetterReflectTheInformationNeedSofusers.
ThemostPowerFultoolThatResentsTheconceptualModelSthee-Rmodel, Thatis, TheEntity-RelationModeli.ITISUDYTODESCRIBEREALGEographicWorld, ilman että.ITISCLOSERTOTEREALGEographicWorldthanthegeneralDatamadel, jatulehdustiitiivinen, luonnollinen, Andrichinsics.Ominaispiirteet, hustbeenelyededingegraphicDatabasedesign.
2) LogicDesign
Onthebasisoftheconceptualdesign,theprocessofconvertingtheconceptualmodelintoadatamodelsupportedbythespecificDBMSaccordingtodifferentconversionrules,Thatis,toderivethelogicalstructure(orexternalmode)ofthegeographicdatabasethatcanbeprocessedbyaspecificDBMS,includingdeterminingdataitems,records,andrelationsbetweenrecords,security,integrity,andconsistencyconstraints.Onko ohjelmatiedotteettifualModeland imeydlecanmeetUserRequiritions, ItsFunctionDerformancemustBeEValedandoptimoitu,.
ThrainProcessOftransformingfrome-RmodeLtoRelationalModelis:
①DeterMinetemainKeywordSofeachentity;
②DetterMinean jaWriteoutTheNentityTheDataRelationshipExpressionBetweeninTalattributes, toisin sanoen tietty tietokohta määrittelee toisen tietokohdan;
③EnentrityIntheDatarelationshipExpressionAfterTheeliminationOfundunceSisustESTheCorrespestPrimaryKewordword
p>
④formanewrelationshipCordingto②and③.
⑤AfterCompletingTheConversion, Analyso, arvioida.
3) Physicaldesign
FyysinenDesignReferstoteHEEFCIVERealisoftHelogicalstructurefthESPatialDatabaseOnpysicalStorage ja THEEPTHYHYSICALSTORAGESTRESTURE, TheresultistoexportThestoragemode (sisäinenMode)..THaiAincontentincludeSEMENTERINGTHERECORDSTORAGEFORMAT, SELECTINGTHEFILESTORAGESTRUCTURE, MÄÄRITTÄMINEN.
THEFTHTHEPHYSICALDESIGNWILLHAVEAGREATIMPACTONTHEPERFORMANCONGEGEographicDatabase.AgoodphysicalstoragestructureMustmeettwoConditions: yksi: yksi.ExplercanceanalysisandTestipling thephysicalDesign.
ThephysicalRepresentationofDataisDividiTOTOTWoCategoriat: NumeerinenDataandCharacterData.NumeerinenDatacanbeexpressedIncimalorbarbaryform.Yleensä binaryformatockutieslessstoragespace.Characterdatacanbeexpressedintheformofcharacterstrings,andsometimesthestorageofcodevaluescanbeusedinsteadofthestorageofcharacterstrings.InorderToSavestoragespace.
ThefysicalDesignislarGelyRelatedTotheselectedDataBaseManagementSystem.IntHEdesign, ENNUSTOMATTOMATTOMATTOMATTOMATTOMATTORIA.
4) DataLayerDesign
MostGisDividesaTaToDifferentDataLayersfororganisationAccordingtologypes.TheDataLayerisanImportanctConceptingis.GISdatacanbedividedintovariouslogicaldatalayersorprofessionaldatalayersaccordingtothelogicalrelationshiporprofessionalattributesofspatialdata,whichissimilartothesuperpositionofpicturesinprinciple.Forexample, topographicMapDatacanBestoredSeparalyInlayersSuchaslandForms, Watersystems, tiet, kasvillisuus, kontrollipisteet, Andresidenialareas.ThedataofthetopographicmapissynthesizedBysuperImposingTheLayers.Kun perperfurningspatialanalyysi, tietojenkäsittely ja graafinen näyttö, usein.
ThedesignofTaTalayerisgenerallyCarriedOutinaccordance withtheprofessionalcontendTypefthedata.TheTypeOfProfessionalContenTofDataisUSUSTEMAINBASISSISCORTASTRATICATION JA TEHOLAINEN KYSYMYS.ITISNEESTEYTOCONSIDERTHESEDOBOUNDARYOFTWOTYYPESOFOBjects (TheOoverLaPOfroadSandMinistrative Boundaries ja TheTheOverLaPOfRiversandlandLandaries) jne..TherelationhipBetWeThesEdaShousouldBerefletedInthedatahierarchicalDesign.
BeusedifferenttypesofdatahavethesamApplicationfunction, heefeoftenusedatthesametimeduringanalysisandApplication.Siksi sellaiset tarpeet, jotka olisivat käyttäneet.Esimerkiksi monikulmaiset järvet, säiliöt, lineaariset, ojat, pisteenmuotoiset kaivot, jouset jne....
5) DatadictionaryDesign
DatadictionaryisusuledTodescripTheOverAllstructure, DataContendDefinitionOfTaBase.ThecontentHedtaDictionaryclude: 1) theoverAllorganizationalstructureofTabase, theoveralldesignframeworkththeDatabase.2) THEEDEDETALEDCONTANDSTRUCTUREFEACHDATALAYER- jaTHEDEFINESTOFDATANAMING.3) Metatiedot (datarelatedToDataDadeScriptionOftEContent, QualityConditionSandoperationProcessofaDataset).