Mapping badland areas using LANDSAT TMETM satellite imagery and morphological dataWord格式文档下载.docx
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Mapping badland areas using LANDSAT TMETM satellite imagery and morphological dataWord格式文档下载.docx
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AbstractAbstract|Figures/TablesFigures/Tables|ReferencesReferences
Abstract
AnewplasmawindtunnelisunderconstructionattheItalianAerospaceResearchCentre(CIRA)locatedatCapua.ItisnamedGHIBLIandtheplasmaisgeneratedbyasegmentedarcheaterwhosepowerisabout2
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References
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Space-borneSyntheticApertureRadarinterferometry(INSAR)isawellknownwidelyusedremotesensingtechniquetogetprecise(sub-centimetric)surfacedeformationmeasurementsonlargeareas(thousandsofkm2)andhighspatialdensityofmeasurementpoints(hundredsperkm2).Inthisworktherecenttechnologicaladvancesofthistechniquearepresented.First,ashortreviewoftheINSARbasicsisdedicatedtoreaderswhoarenotINSARspecialists.Then,ananalysisoftheimprovementofgroundmotionmeasurementofferedbymultiplerepeatedspace-borneSARobservationsgatheredbythenewgenerationofhighresolutionSARsystemsisgiven.AnexampleobtainedwiththerecentGermanTERRASAR-XsystemisshownandcomparedwiththemeasurementsobtainedwiththeelderC-bandRADARSAT-1system.Finally,apossibleprocessingofmulti-temporalanalysisofSARimagesthatallowextractinggroundmotioninformationalsofrompartiallycoherenttargetsisgiven.InthiscasethecoreideaistorelaxtherestrictiveconditionsimposedbythePermanentScattererstechnique.Theresultsobtainedindifferenttest-sitesshowanincreasedspatialdensityofarealdeformationtrendmeasurements,especiallyinextra-urbanareasatthecostofmissingmotionswithstrongvelocityvariation.
2.INSARandDINSAR(differentialSARinterferometry)
2.1.MovingfromINSARtoPS
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2.3.Theeffectofresolutionimprovement
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6.1%ofalreadymappedlandslidesand0.8%ofnewunstableareasdetectedthroughthePSanalysis.Moreover,mostofthePSarelocatedinurbanareas,showingthattheproposedmethodologyissuitableforlandslidemappinginareaswithaquitehighdensityofurbanization,butthatovervegetatedareasitstillsuffersfromthelimitationsinducedbythecurrentspace-borneSARmissions(e.g.temporalde-correlation).Ontheotherhand,theuseofInSARforthemonitoringofsingleslowlandslidesthreateningbuilt-upareashasprovidedsatisfactoryresults,allowingthemeasurementofsuperficialdeformationswithhighaccuracyonthelandslidesectorscharacterizedbyagoodradarreflectivityandcoherence.
2.Studyarea
3.Datasetsandmethods
3.1.SARdatasetandinterferometricprocessing
3.2.Opticaldatasetandancillarydata
4.IntegratinglandslideinventoryandInSARdata
4.1.ApplicationofthemethodtotheArnodrainagebasin
5.Landslidedisplacementmonitoring
5.1.TheCarboniletestarea
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Thesolidstatenucleartrackdetection(SSNTD)techniqueisnowawell-establishedtoolforthedetectionofchargedparticleswithstoppingpowergreaterthanacertainthresholdvalue.Beingapassivedetectionsystem,itexistedintheformofprimordialcrystalsandhencequalifiedtoberegardedasthe‘oldest’memberofthenucleardetectionsystems.Sincetheadventofitslaboratoryusein1958,thetechniquewasadoptedbydifferentlaboratoriesatdifferenttimesallovertheworld.PakistanisoneofthecountriesthatestablishedanSSNTD-laboratoryintheearliestdevelopmentalstageofthetechnique.Consequently,significantcontributionsweremadebyasmallbutenergeticgroupofscientiststowardthemethodologyofthetechniqueaswellasitsapplicationsindiverseareassuchasnuclearphysics,cosmology,materialscience,geology,geophysics,bio-medicalphysicsandenvironmentalscience.InthisarticlewewillattempttopresentabriefsummaryoftheimportantadvancesmadeinthedevelopmentofthistechniqueanditsinnovativeapplicationsbyPakistaniresearchersinvariousfieldsofscienceandtechnology.
Aselsewhereintheworld,thetechniqueisnotubiquitousinallnuclearresearchlaboratoriesinPakistanbecauseofthewell-knownlimitationsofthedetectionsystem.However,thenumberofworkersinvolvedinresearchstudieshasbeengrowingovertheyears.Theseincludedboththefreshresearchersaswellasthosewhoshiftedfromotherresearchinterests.ThishasresultedinahealthyreinforcementofthemanpowerengagedinSSNTD-basedresearchwork.Afteraselectivepresentationoftheon-goinginvestigationsbasedontheuseofSSNTDsinPakistan,somecommentsaremadeforthepossiblefuturedirectionsofprogress.
ToputthePakistaniexperienceininternationalperspective,itisemphasizedthattheuniquefeaturesofSSNTDsarefacingseriouschallengesfromrapidadvancesinhighprecisionelectron
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