Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Classification of different types of snow using spectral and angular imaging
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik.ORCID-id: 0000-0002-5943-1476
2016 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)Alternativ titel
Klassificering av snö med hjälp av spektral och vinkel avbildning (Svenska)
Abstract [en]

The current thesis work details a non-contact detection approach concerningclassification of snow with different physical properties such as grain size, densityand specific surface area (SSA). In this approach, reflected light from snowsurfaces is measured as a function of wavelength and viewing geometry. Essentiallya detector (either a near-infrared (NIR) camera or a spectrometer) and anillumination source are needed to measure the spectrally and angularly resolvedbidirectional reflectance from snow. Classification of snow types is performedbased on the absorption and scattering properties of a respective snow type. Itis furthermore known that snow properties can be modelled using a numericalsolver where the radiative transfer equation (RTE) for snow is solved and ascattering phase function is estimated by expanding into a series of Legendrecoefficients. It is therefore expected to be a connection between snow characteristicsand the Legendre coefficients of the scattering phase function.

Results suggest that different snow types can be classified using two wavelengths(980 nm, 1310 nm) from the high reflectance region and one wavelength(1550 nm) from the high absorption region. It is also observed that thebidirectional reflectance for snow tends to increase in specular direction (antiilluminationdirection) as snow density increases. Results from the numericalmethod suggest that the first coefficient of the Legendre phase function is arelative estimate of the single scattering albedo rather than an absolute estimateand that the second coefficient estimates the anisotropy of a respectivesnow type. Investigations in this thesis suggest that the presented approachcan be used as a tool to classify different snow types in various applicationssuch as icing on wind turbine blades, winter roads maintenance and ski tracksmaintenance.v

Ort, förlag, år, upplaga, sidor
Luleå: Luleå University of Technology, 2016.
Serie
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
Nationell ämneskategori
Teknisk mekanik
Forskningsämne
Experimentell mekanik
Identifikatorer
URN: urn:nbn:se:ltu:diva-59817ISBN: 978-91-7583-729-1 (tryckt)ISBN: 978-91-7583-730-7 (digital)OAI: oai:DiVA.org:ltu-59817DiVA, id: diva2:1038492
Presentation
2016-12-15, E243, Luleå University of Technology, Luleå, 10:00
Tillgänglig från: 2016-10-18 Skapad: 2016-10-18 Senast uppdaterad: 2017-11-24Bibliografiskt granskad

Open Access i DiVA

fulltext(5720 kB)232 nedladdningar
Filinformation
Filnamn FULLTEXT01.pdfFilstorlek 5720 kBChecksumma SHA-512
84d9ee2ffa5ef485226b468bd5207cd00f87b400d7ac0758228e6c77fb5bee83a3200fb75faa041c60c56595f3aa3923b382fa55d64aefbe8373b15b24edd0b8
Typ fulltextMimetyp application/pdf

Personposter BETA

Eppanapelli, Lavan Kumar

Sök vidare i DiVA

Av författaren/redaktören
Eppanapelli, Lavan Kumar
Av organisationen
Institutionen för teknikvetenskap och matematik
Teknisk mekanik

Sök vidare utanför DiVA

GoogleGoogle Scholar
Totalt: 232 nedladdningar
Antalet nedladdningar är summan av nedladdningar för alla fulltexter. Det kan inkludera t.ex tidigare versioner som nu inte längre är tillgängliga.

isbn
urn-nbn

Altmetricpoäng

isbn
urn-nbn
Totalt: 675 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf