环境数据转换插件安装步骤.docx

环境数据转换插件安装步骤.docx

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环境数据转换插件安装步骤

User’sGuide

INTRODUCTION

TheEnvironmentalDataConnector（EDC）isatoolthatallowsuserstoconnecttoTHREDDS/OPeNDAPserversfromwithinArcGISanddownloadenvironmentaldata.ItwasdevelopedfortheNationalOceanicandAtmosphericAdministration（NOAA）FisheriesbyAppliedScienceAssociates,Inc.（ASA）.TheEDCisavailableintwoversions:

theoriginalEDCwhichisdesignedtoworkinconjunctionwithArcGIS,andtheEDCStandaloneversionwhichcanberunoutsideArcGIS.

INSTALLATION

TheEnvironmentalDataConnector（EDC）isavailablefordownloadat

http:

//www.pfeg.noaa.gov/products/EDC

FortheArcGISversionoftheEDC,clickthe‘DownloadEDC’link.FortheStandaloneversionoftheEDC,clickthe‘DownloadEDCStandalone’link.

AlthoughregistrationisnotnecessarytodownloadtheEDC,weencourageyoutoregisteronthiswebsiteifyouwouldliketobeinformedwhenupdatesaremadeavailable.Installationinstructionsandthisuserguidearealsoavailableatthiswebsite.

GETTINGSTARTED

Aninstallationmanualisalsoavailablefordownloadfromthewebsite,InstalltheEDCaccordingtothoseinstructions.

TostarttheEDC,eitherclickontheEDCiconinArcMaporclickthe‘EDC’menuandchoose‘EnvironmentalDataConnector’.TheEDCwillopeninanewwindow.WhiletheEDCisopen,ArcGISislockedandinaccessible.

CONNECTINGTODATA

InthetopportionoftheEDC,youmayselectthedatasource.ValiddatasourcesareeitherTHREDDSdatacatalogsorindividualdatasets.Thedropdownmenuslistsomecommonsourcesforoceanographicandatmosphericdata.YoumayselectoneofthecatalogsordatasetsinthedropdownmenusormanuallytypeinadifferentURL.The‘CatalogURL’connectstoTHREDDSdatasetcatalogs,whilethe‘DirectAccessURL’connectstoindividualdatasets.

Onceyouhaveselectedacatalog（ordataset）,clickthe‘Connect’buttontoconnecttothatdataset.Ifyouconnecttoadatacatalog,adirectorytreewillappearinthelefthandsideoftheEDCshowingthedirectorystructureofthedatacatalog.Selectthedatasetyouwouldliketodownloadbynavigatingthroughthisdirectorystructure.

Onceyouhavenavigatedtoasingledataset,youwillseethatdataset’smetadatainthemainscreentotherightofthedirectorytree.Theamountofmetadatawillvarydependingonthedatasetandthedatasource.

VIEWINGANDSUBSETTINGDATA

Onceyouhavenavigatedtoyourdatasetofinterestandreviewedthemetadata,clickthe“Subset&Process’buttontoconnecttothedataset.OncetheEDCconnectstothedataset,anewtabwindowopensintheEDC.Thistabhasa‘Subset&Process’title.The‘Browse’tabisstillvisible,andyoumayclickonthistabtodisplaythecatalogtreeandconnecttootherdatasets.

Inthe‘Subset&Process’tab,amapisshownwiththemaximumspatialextentofthedatasetshownbyaredbox.

Abovethemapisanavigationtoolbar.Thistoolbarallowsyoutonavigatearoundthemap.Youmayzoominoroutandpanaroundthemap.Thereisalsoatoolformeasuringdistancesonthemap.

SELECTINGSPATIALLIMITS

Toselectanarea,youmayeitherdragaboundingboxaroundtheareawiththeselectiontool（outlinedaboveinred）,oryoumaymanuallyinputaboundingboxusingtheAOItool（AreaofInterest）.WiththeAOItool,youmaymanuallyinputthecoordinatesofaspatialboundingboxforthedata.Youmayalsosaveboundingboxesforfutureuse.

Unfortunately,thecurrentreleaseoftheEDCcannotdownloaddatawhichspanstheprimemeridian（0longitude）.IfyouinputanAOIwhichspans0longitude,onlythedatawhichliestotheeast（longitude>0）willbedownloaded.Inordertogettheentireregionofdata,youshoulddownloadthedataintwopieces:

onepiecewithwestlongitudeandonepiecewitheastlongitude.YoumaythenmergethedatainArcGIS.SeethefollowingESRItechnicalarticleonmergingmultibandrasters:

SELECTINGTEMPORALLIMITS

Onceyouhavedefinedthespatialareathatyouwishtodownload,definethetimesofthedatathatyouwishtodownload.ThisisdonebymanipulatingthetimebaratthebottomoftheEDC.Inthetimebar,thegreenpointerrepresentsthebeginningtimeofthedatatobedownloaded,andtheredpointerrepresentstheendingtime.Youcanalsoinputstartandendtimesmanually（hittheenterbuttononceyou’vechangedthestartorendtimestoupdatethepointerlocations）.Ifyouselectabeginningtimeinthetimebarthatdoesnotexactlycoincidewithatimeinthedataset,thentheEDCwilldownloadtheclosestprevioustimestep,aswellasallthedatathatfallsbetweenthebeginningandendtimes.

Justabovethetimebar,thetimeintervalbetweenconsecutivetimesofthedatasetisdisplayed.Thistimeintervalistheaverageintervalbetweenconsecutivetimestepsfortheselecteddataset.Itiscalculatedbydividingtherangeoftimesteps（lasttime–firsttime）bythenumberoftimesteps.Theactualtimebetweentwoconsecutivedatapointsmightbedifferentthanthisvalue.

DOWNLOADINGRASTERDATA

Ifthedatathatyouaredownloadingisrasterdata,thenselectthe‘Raster’tabinthe‘OutputOptions’windowintherighthandsideoftheEDC.Checktheboxnexttothevariablethatyouwouldliketodownload.Dependingonthespecificdatasetyouareconnectedto,theremightbemorethanonevariableinthislist.Ifyouaredownloadingthedataasaraster,youcanonlydownloadonevariableatatime.

Onceyouhaveselectedtherastervariable,clickthe‘Process’buttontodownloadthedata.Youwillbeaskedtogiveanameforthedata.Onceyouclickthe‘Process’button,theEDCsubsetsthedataontheserver,onlydownloadingthedataforthetimeandspacethatyouhaveselected.ThedataisinitiallydownloadedinnetCDFformat.Oncethedownloadiscomplete,theEDCwillclose.ThedownloadednetCDFfileisthenconvertedtoanArcGISrasterusingArcGIS’sconversiontools（onlyavailableinArcGISversion9.2orlater）.BepatientwhileArcGISconvertsthefile.ThiscanoftenbealengthystepandthereisnoprogressbartoshowthatArcMapisstillworkingontheconversion.

TheresultingArcGISlayerisamultibandraster.Thedatadimensionusedasthebanddimensionisspecifiedinthe‘OutputOptions’windowoftheEDC.Thisbanddimensionisusuallytime,butcanbeanotherdimension（suchasdepthorheight）ifthatdimensionisavailable.Ifthedatasetcontainsmorethan3dimensions,thenyoumustselectthevalueofthe4thdimensioninthe‘SelectLevel’menu.Forexample,ifthedatasethasdimensionsof‘latitude’,‘longitude’,‘altitude’,and‘time’,andyouselect‘time’asthebanddimension,thenyouwouldhavetopickthealtitudelevelofthedata.Somedatasetsmighthavea4thdimensioncontainingonlyonevalue（e.g.–0meteraltitudeforsealeveldata）.

DOWNLOADINGFEATUREDATA

IfyourdataismoresuitedtoanArcGISfeaturelayerratherthananArcGISraster,thenyoumaychoosetodownloadthedataasafeaturedataset.Unlikearaster,afeaturedatasetcancontainmultipledatavariables.Acommontypeoffeaturedatasetiscurrentorwinddata.Thesedatasetsconsistof（atleast）twovariables,au-component（zonal）andav-component（meridional）.

Whendownloadingfeaturedatasets,selectthespatialandtemporallimitsofthedatayouwishtodownload.Selectthe‘Feature’tabinthe‘OutputOptions’window.Selectthevariablesyouwishtoimportinthe‘Variables’window.

Inthe‘Feature’tab,selectthelevelofthedatayouaredownloading（seethesectionon‘DownloadingRasterData’forinformationondatalevels）.Ifthedatayouwanttodownloadisvectordata（suchaswindorcurrentdata）,thenselectthe‘AsVectors’boxandselectthevariableswhichrepresenttheuandvcomponentsofthevectors.ThesevariableswillbeusedtocalculatethespeedanddirectionfieldsneededbyArcGIStodisplayvectors.

Sometimes,youmaywanttocombinevariableswhicharepresentindifferentdatasetsintothesameArcGISfeaturedataset.Inthissituation,subsetandprocessthefirstdatasetyouwantbyconnectingtothedatasetandselectingthespatialandtemporallimits.Thenclickthe“AddDataset”button,locatedabovethemaptoolbar.ClickingthisbuttonwillbringyoubacktotheTHREDDScatalog/datasetselectionpage.Selecttheseconddatasetyouwishtoadd,andclick“SubsetandProcess”.Bothvariableswillnowbevisibleinthe‘Variables’window.Repeattoaddadditionaldatasetvariables.Notethatinordertomergedatasets,themetadataforthetwodatasetsbeingmergedmustbeexactlyidentical.

Onceyouhaveselectedthespatialandtemporallimitsandselectedallthevariablesyouwishtoincludeinthefeaturedataset,clickthe‘Process’buttontoimportthedataintoArcGIS.Thedownloadingprocessissimilartotherastercase.First,theEDCsubsetsanddownloadsthedataasanetCDFfile.Then,ArcGISconvertsthisnetCDFfiletoafeaturelayer.BepatientwhileArcGISconvertsthenetCDF!

VIEWINGDATAINARCGIS

OncethedatahasbeendownloadedandconvertedbyArcGIStools,itwillbedisplayedinthecurrentArcMapwindow.

ByrightclickingonthedatasetintheTableofContentsandselecting‘Properties’,youcanseethepropertiesofthedatathatwasjustimported.

Thedatasetpropertieswindowforarasterdatasetsshowsinformationsuchasthesourceandfilelocation,thespatialextentofthedata,thenumberofbands（thenumberofbandsisequaltothenumberoftimesteps）,thecellsizeoftheraster,andthespatialreference（alldataisimportedwiththeWGS1984spatialreference）.Intheprope