elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Impressum | Kontakt | English
Schriftgröße: [-] Text [+]

Exact G-functions for various leaf normal distribution functions applied to analytical two-stream radiative transport in turbid vegetation media

Otto, Sebastian und Trautmann, Thomas (2008) Exact G-functions for various leaf normal distribution functions applied to analytical two-stream radiative transport in turbid vegetation media. In: Abstracts Booklet. International Radiation Symposium (IRS) 2008, 2008-08-03 - 2008-08-08, Foz do Iguaçu (Brazil).

[img]
Vorschau
PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
1MB

Kurzfassung

In the radiative transfer theory for turbid vegetation media one defines leaf normal distribution (LND) functions to describe the orientation of the model leaves’ normal vectors. For simulation purposes, standard LNDs are frequently assumed, e.g. based on measurements, which have to fulfil a normalisation condition. Unfortunately, the literature reveals various discrepancies with respect to the proper definition of normalised LNDs. So-called G-functions are derived from the LNDs, and thus they are an important part of the radiative transfer equation for turbid vegetation media. Up to now, analytical G-functions have been derived for the most simple LND cases, only. We will revisit the normalisation problem and present an extended set of analytical expressions of G-functions for the most commonly used LNDs, which are then compared to approximations in literature. Moreover, these considerations allow us to extend the two-stream theory in a stringent analytical manner to various LND scenarios ranging from purely horizontal to purely vertical model leaves. Finally, we applied these very fast radiative transfer schemes to simulate canopy reflectances and transmittances as a function of the ratio of direct and diffuse light impinging on the vegetation medium at its upper boundary.

Dokumentart:Konferenzbeitrag (Poster)
Titel:Exact G-functions for various leaf normal distribution functions applied to analytical two-stream radiative transport in turbid vegetation media
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Otto, SebastianNICHT SPEZIFIZIERT
Trautmann, ThomasNICHT SPEZIFIZIERT
Datum:August 2008
Erschienen in:Abstracts Booklet
Referierte Publikation:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:G-function, two-stream radiative transfer
Veranstaltungstitel:International Radiation Symposium (IRS) 2008
Veranstaltungsort:Foz do Iguaçu (Brazil)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2008-08-03 - 2008-08-08
Veranstalter :International Radiation Commission (IRC), part of the International Association of Meteorology and Atmospheric Sciences (IAMAS)
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Verkehr
HGF - Programmthema:Verkehrssystem
DLR - Schwerpunkt:Verkehr
DLR - Forschungsgebiet:V VS - Verkehrssystem
DLR - Teilgebiet (Projekt, Vorhaben):V - Mittel- und langfristige Entwicklung der Personenverkehrsnachfrage (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Methodik der Fernerkundung > Atmosphärenprozessoren
Hinterlegt von: Sebastian Otto
Hinterlegt am:19 Jan 2009
Letzte Änderung:12 Dez 2013 20:36

Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags

Blättern
Suchen
Hilfe & Kontakt
Informationen
electronic library verwendet EPrints 3.3.12
Copyright © 2008-2013 Deutsches Zentrum für Luft- und Raumfahrt (DLR). Alle Rechte vorbehalten.