ImportingScientificDataFiles
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Step3: SpecifyingaSubsetof f theData(Optional). Whenyouselect
adatasetinthecontentspane,theimportingandsubsettingpanedisplays
thesubsettingoptionsavailableforthattypeofHDFobject.Thesubsetting
optionsdisplayedvarydependingonthetypeofHDFobject. Formore
information,see“UsingtheHDFImportToolSubsettingOptions”onpage
2-79.
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Importing Data
Step4: ImportingDataandMetadata. Toimportthedatasetyouhave
selected,clicktheImportbutton,bottomrightcorneroftheImportingand
Subsettingpane.UsingtheImportingandSubsettingpane,youcan
• Specifythenameoftheworkspacevariable—Bydefault,theHDF
ImportToolusesthenameoftheHDF4datasetasthenameofthe
MATLABworkspacevariable.Inthefollowingfigure,thevariablename
is
Example_SDS
.Tospecifyanothername,entertextintheWorkspace
Variabletextbox.
• Specifywhethertoimportmetadataassociatedwiththedataset—To
importanymetadatathatmightbeassociatedwiththedataset,selectthe
ImportMetadatacheckbox. Tostorethemetadata,theHDFImport
Toolcreatesasecondvariableintheworkspacewiththesamenamewith
_info
”appendedtoit. Forexample,ifyouselectthischeckbox,the
nameofthemetadatavariableforthedatasetinthefigurewouldbe
Example_SDS_info
.
• Savethedatasetimportcommandsyntax—TheDatasetimport
commandtextwindowdisplaystheMATLABcommandusedtoimport
thedataset.Thistextisnoteditable,butyoucancopyandpasteitintothe
MATLABCommandWindoworatexteditorforreuse.
ThefollowingfigureshowshowtospecifytheseoptionsintheHDFImport
Tool.
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ImportingScientificDataFiles
Step5: ClosingHDFFilesandtheHDFImportTool. Tocloseafile,
selectthefileinthecontentspaneandclickCloseFileontheHDFImport
ToolFilemenu.
TocloseallthefilesopenintheHDFImportTool,clickCloseAllFileson
theHDFImportToolFilemenu.
Toclosethetool,clickCloseHDFToolintheHDFImportToolFilemenuor
clicktheClosebuttonintheupperrightcornerofthetool.
Ifyouusedthe
hdftool
syntaxthatreturnsahandletothetool,
h = = hdftool('example.hdf')
youcanusethe
close(h)
commandtoclosethetoolfromtheMATLAB
commandline.
UsingtheHDFImportToolSubsettingOptions
Whenyouselectadataset,theimportingandsubsettingpanedisplaysthe
subsettingoptionsavailableforthattypeofdataset. Thefollowingsections
provideinformationaboutthesesubsettingoptionsforallsupporteddata
settypes.ForgeneralinformationabouttheHDFImporttool,see“Using
theHDFImportTool”onpage2-74.
• “HDFScientificDataSets(SD)”onpage2-80
• “HDFVdata”onpage2-81
• “HDF-EOSGridData”onpage2-82
• “HDF-EOSPointData”onpage2-87
• “HDF-EOSSwathData”onpage2-88
• “HDFRasterImageData”onpage2-92
NoteTousethesedatasubsettingoptionseffectively,youmustunderstand
theHDFandHDF-EOSdataformats. Therefore,usethisdocumentation
inconjunctionwiththeHDFdocumentation(
www.hdfgroup.org
)andthe
HDF-EOSdocumentation(
www.hdfeos.org
).
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2
Importing Data
HDFScientificDataSets(SD).TheHDFscientificdataset(SD)isagroup
ofdatastructuresusedtostoreanddescribemultidimensionalarraysof
scientificdata. UsingtheHDFImportToolsubsettingparameters,youcan
importasubsetofanHDFscientificdatasetbyspecifyingthelocation,range,
andnumberofvaluestobereadalongeachdimension.
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Thesubsettingparametersare:
• Start—Specifiesthepositiononthedimensiontobeginreading. The
defaultvalueis1,whichstartsreadingatthefirstelementofeach
dimension. Thevaluesspecifiedmustnotexceedthesizeoftherelevant
dimensionofthedataset.
• Increment—Specifiestheintervalbetweenthevaluestoread. The
defaultvalueis1,whichreadseveryelementofthedataset.
• Length—Specifieshowmuchdatatoreadalongeachdimension. The
defaultvalueisthelengthofthedimension,whichcausesallthedatato
beread.
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ImportingScientificDataFiles
HDF Vdata. HDFVdatadatasetsprovideaframeworkforstoring
customizedtables. AVdatatableconsistsofacollectionofrecordswhose
valuesarestoredinfixed-lengthfields.Allrecordshavethesamestructure
andallvaluesineachfieldhavethesamedatatype.Eachfieldisidentified
byaname.ThefollowingfigureillustratesaVdatatable.
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YoucanimportasubsetofanHDFVdatadatasetinthefollowingways:
• Specifyingthenameofthefieldthatyouwanttoimport
• Specifyingtherangeofrecordsthatyouwanttoimport
Thefollowingfigureshowshowyouspecifythesesubsettingparametersfor
Vdata.
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Importing Data
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HDF-EOSGridData. InHDF-EOSGriddata,arectilineargridoverlaysa
map.Themapusesaknownmapprojection.TheHDFImportToolsupports
thefollowingmutuallyexclusivesubsettingoptionsforGriddata:
Toaccesstheseoptions,clicktheSubsettingmethodmenuintheimporting
andsubsettingpane.
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DirectIndex
YoucanimportasubsetofanHDF-EOSGriddatasetbyspecifyingthe
location,range,andnumberofvaluestobereadalongeachdimension.
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ImportingScientificDataFiles
Eachrowrepresentsadimensioninthedatasetandeachcolumnrepresents
thesesubsettingparameters:
• Start—Specifiesthepositiononthedimensiontobeginreading. The
defaultvalueis1,whichstartsreadingatthefirstelementofeach
dimension. Thevaluesspecifiedmustnotexceedthesizeoftherelevant
dimensionofthedataset.
• Increment—Specifiestheintervalbetweenthevaluestoread. The
defaultvalueis1,whichreadseveryelementofthedataset.
• Length—Specifieshowmuchdatatoreadalongeachdimension. The
defaultvalueisthelengthofthedimension,whichcausesallthedatato
beread.
GeographicBox
YoucanimportasubsetofanHDF-EOSGriddatasetbyspecifyingthe
rectangularareaofthegridthatyouareinterestedin. Todefinethis
rectangulararea,youmustspecifytwopoints,usinglongitudeandlatitude
indecimaldegrees. Thesepointsaretwocornersoftherectangulararea.
Typically,Corner1istheupper-leftcornerofthebox,andCorner2isthe
lower-rightcornerofthebox.
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Importing Data
Optionally,youcanfurtherdefinethesubsetofdatayouareinterestedin
byusingTimeparameters(seeTimeonpage86)orbyspecifyingother
User-Definedsubsettingparameters(seeUser-Definedonpage87).
Interpolation
Interpolationistheprocessofestimatingapixelvalueatalocationin
betweenotherpixels. Ininterpolation,thevalueofaparticularpixelis
determinedbycomputingtheweightedaverageofsomesetofpixelsinthe
vicinityofthepixel.
Youdefinetheregionusedforbilinearinterpolationbyspecifyingtwopoints
thatarecornersoftheinterpolationarea:
• Corner1–Specifylongitudeandlatitudevaluesindecimaldegrees.
Typically,Corner1istheupper-leftcornerofthebox.
• Corner2—Specifylongitudeandlatitudevaluesindecimaldegrees.
Typically,Corner2isthelower-rightcornerofthebox
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ImportingScientificDataFiles
Pixels
YoucanimportasubsetofthepixelsinaGriddatasetbydefininga
rectangularareaoverthegrid. Youdefinetheregionusedforbilinear
interpolationbyspecifyingtwopointsthatarecornersoftheinterpolation
area:
• Corner1–Specifylongitudeandlatitudevaluesindecimaldegrees.
Typically,Corner1istheupper-leftcornerofthebox.
• Corner2—Specifylongitudeandlatitudevaluesindecimaldegrees.
Typically,Corner2isthelower-rightcornerofthebox
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Importing Data
Tile
InHDF-EOSGriddata,arectilineargridoverlaysamap. Eachrectangle
definedbythehorizontalandverticallinesofthegridisreferredtoasatile.If
theHDF-EOSGriddataisstoredastiles,youcanimportasubsetofthedata
byspecifyingthecoordinatesofthetileyouareinterestedin.Tilecoordinates
are1-based,withtheupper-leftcornerofatwo-dimensionaldatasetidentified
as
1,1
.Inathree-dimensionaldataset,thistilewouldbereferencedas
1,1,1
.
Time
YoucanimportasubsetoftheGriddatasetbyspecifyingatimeperiod.
Youmustspecifyboththestarttimeandthestoptime(theendpointofthe
timespan).Theunits(hours,minutes,seconds)usedtospecifythetimeare
definedbythedataset.
Alongwiththesetimeparameters,youcanoptionallyfurtherdefinethe
subsetofdatatoimportbysupplyinguser-definedparameters.
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