InlandENCContent1.Inlandwaterways2.WhyareENCsnotsufficient?(voyageplanning)3.DefinitionofInlandENC4.S-100approach5.Newandcopiedfeatures,attributes,enumerations6.EncodingGuideforInlandENCs7.Usagesandoverlays8.ProductSpecificationforInlandENCs9.Depthdataandwaterlevels10.IEHGandIHO11.Regulatorystatus12.Coverage13.UsersofInlandENCsInlandwaterwaysMaritimenavigationisgovernedbyworldwideregulationsofIMO,e.g.COLREGInlandwaterways(e.g.Mississippi,Amazon,Rhine,Danube,Volga,Yangtze,andallsmallernavigableriversandlakes)havespecificfeaturesandspecificregulations(specificsignals,markings,andtrafficrules,groins,groundsills,revetments,…)ThelowerpartsofthebiginlandwaterwaysareusedbybothinlandandmaritimevesselsInlandENCsneedtomeettherequirementsofinlandwaterways,butshouldalsobeavailableformaritimevesselsTheneedforInlandENCsWaterbornetrafficoninlandwaterwaysisnotregulatedbyCOLREGorSOLAS,butbyregionalornationalregulations:Europe:EuropeanCodeforInlandWaterways(CEVNI)oftheUnitedNationsUSA:CodeofFed.Regulations33CFRRussia:RulesofnavigationalongtheinlandwaterwaysofRFBrazil:asetofnationalandregionalregulationsChina:SouthKorea:Theseregulationscontainspecificwaterwaysignals,signsandmarkingsWhyareENCsnotsufficient?ObjectssuchasbridgescanonlybeencodedinaverybasicformformaritimeENCs,butareextremelyimportantforinlandnavigationIninlandnavigationitisnormallynotpossibletotakeanotherroute,ifthereisaproblemontheoriginalroute:detailedinformationiscriticalforvoyageplanning(e.g.dimensionsandoperatinghoursoflocksandmovablebridges)DefinitionofInlandENCthedatabase,standardizedastocontent,structureandformat,forusewithinlandelectronicchartdisplayand/orinformationsystemsoperatedonboardofvesselstransitinginlandwaterways.AnIENCisissuedbyorontheauthorityofacompetentgovernmentagency,andconformstostandards[initially]developedbytheInternationalHydrographicOrganization(IHO)and[refinedby]theInlandENCHarmonizationGroup.AnIENCcontainsallthechartinformationnecessaryforsafenavigationoninlandwaterwaysandmaycontainsupplementaryinformationinadditiontothatcontainedinthepaperchart(e.g.sailingdirections,machine-readableoperatingschedules,etc.)whichmaybeconsiderednecessaryforsafenavigationandvoyageplanning.[IENCEncodingGuide,Edition2.2,Feb2010]TheS-57S-100approachInlandENCsaresimilarto‘maritime’ENCs,withafewexceptions:UseofS-57objectclasses,attributesandattributevalues,asmuchaspossibleIntroducenewcombinationsofexistingelements,whennecessaryIncludenewfeatures,attributesorenumerations,ifnecessaryPriortotheadoptionofS-100,itwasnecessarytoassignsmallcaseacronymsforS-57objectclassesthatwereusedwithadditionalornewattributes/enumerationsandfornewelementsSmallcaseelementswillbereplacedbyelementsfromtheHYDROandtheIENCdomainsinafutureProductSpecification,whichwillbebasedonS-101CopiedandnewelementsTheS-57attributeVERDAT(verticaldatum)onlycontainsenumerationsforverticaldatumsformaritimenavigationIninlandnavigationtherearedifferentverticaldatumsinuse(e.g.OhioRiverDatum,RussianProjectWaterLevel,ReferenceLowwaterLevelofDanubeCommission,etc.)InlandENCscontainacopiedattribute“verdat”withtheseadditionalenumerationsWiththiscopiedattributeitisalsonecessarytointroduceacopiedfeature“m_sdat”ForsomefeaturesthatarenotcoveredbyS-57itwasnecessarytointroducenewfeatures(e.g.noticemarks)FeaturesAttributesEnumerationsEncodingGuideforInlandENCsToensureacommonunderstandingandconsistentencodingforallworldwideregions,thereisaverydetailedEncodingGuideforInlandENCs(whichreplacesthesection“UseoftheObjectCatalogue”ofS-57)Seefollowingexamplefortheencodingofabridgewithbridgearches:UsagesOnmajorinlandwaterways,InlandENCsarenormallyproducedandusedatalargerscalethan‘maritime’ENCsWhilethelargestscalefor‘maritime’ENCsisusage6(berthing),forInlandENCstherearethreeusagecodes:7-river8-riverharbour9-riverberthingOverlaycellsInsomeregions,differentauthoritiesareresponsibleforthemaintenanceofthewaterway,andforthetrafficregulation(e.g.buoys,beacons,noticemarks,signals)Depthinformationisextremelyimportantoninlandwaterways(50cmbetweenkeelandriverbedisnormal)andinsomeareasdepthareconstantlychangingAssuch,itmaybenecessarytoupdatethedepthinformationmuchmorefrequentlythentherestoftheInlandENCInlandENCsprovidethepossibilitytouse“overlaycells”OverlaycellsOverlaycellsdonotcontainskinoftheearthfeaturesTheyaredisplayedbyanInlandECDIStogetherwithanInlandENCofusage1to9TheInlandECDISusesthedisplayprioritiestocomposethedisplay+=ProductSpecificationforInlandENCsTheProductSpecificationforInlandENCsisbasedonIHOS-57,edition3.1ItcontainsthenecessaryamendmentstoenabletheencodingofadditionalfeaturesforinlandwaterwaysItdescribesthedifferences(e.g.inthecellheader)thatidentifythecellasanInlandENC,theusage,andsoonDepthdataandwaterlevelsDepthdatainENCsisbasedonaverticaldatum,whichisahorizontalplaneDepthdatainInlandENCsofriversisreferredtoslopedandnon-linearreferencewaterlevelTheactualwaterlevelisirregularandcannotbedeterminedbytidetables.Instead,ithastobederivedfromwaterlevelgaugesDuetovariationsoftheareaofcrosssectionsandthebaseslopeoftheriverbedd