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The Influence of the Time Equation on Remote Sensing Data Interpretation

Fichtelmann, Bernd und Borg, Erik und Schwarz, Egbert (2015) The Influence of the Time Equation on Remote Sensing Data Interpretation. In: International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives, Seiten 195-201. 36th International Symposium on Remote Sensing of Environment (ISRSE), 2015-05-11 - 2015-05-15, Berlin, Deutschland. doi: 10.5194/isprsarchives-XL-7-W3-195-2015. ISSN 1682-1750.

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Offizielle URL: http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XL-7-W3/195/2015/isprsarchives-XL-7-W3-195-2015.pdf

Kurzfassung

The interpretation of optical Earth observation data (remote sensing data from satellites) requires knowledge of the exact geographic position of each pixel as well as the exact local acquisition time. But these parameters are not available in each case. If a satellite has a sun-synchronous orbit, equator crossing time (ECT) can be used to determine the local crossing time (LCT) and its corresponding solar zenith distance. Relation between local equator crossing time (LECT) and LCT is given by orbit geometry. The calculation is based on ECT of satellite. The method of actual ECT determination for different satellites on basis of the two-line-elements (TLE), available for their full lifetime period and with help of orbit prediction package is well known. For land surface temperature (LST) studies mean solar conditions are commonly used in the relation between ECT given in Coordinated Universal Time (UTC) and LECT given in hours, thus neglecting the difference between mean and real Sun time (MST, RST). Its difference is described by the equation of time (ET). Of particular importance is the variation of LECT during the year within about ±15 minutes. This is in each case the variation of LECT of a satellite, including satellites with stable orbit as LANDSAT (L8 around 10:05 a.m.) or ENVISAT (around 10:00 a.m.). In case of NOAA satellites the variation of LECT is overlaid by a long-term orbital drift. Ignatov et al. (2004) developed a method to describe the drift-based variation of LECT that can be viewed as a formal mathematical approximation of a periodic function with one or two Fourier terms. But, nevertheless, ET is not included in actual studies of LST. Our paper aims to demonstrate the possible influence of equation of time on simple examples of data interpretation, e.g. NDVI.

elib-URL des Eintrags:https://elib.dlr.de/97325/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:The Influence of the Time Equation on Remote Sensing Data Interpretation
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Fichtelmann, Berndbernd.fichtelmann (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Borg, Erikerik.borg (at) dlr.dehttps://orcid.org/0000-0001-8288-8426NICHT SPEZIFIZIERT
Schwarz, EgbertEgbert.Schwarz (at) dlr.dehttps://orcid.org/0000-0003-2901-234XNICHT SPEZIFIZIERT
Datum:Mai 2015
Erschienen in:International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Nein
DOI:10.5194/isprsarchives-XL-7-W3-195-2015
Seitenbereich:Seiten 195-201
ISSN:1682-1750
Status:veröffentlicht
Stichwörter:Equator crossing time, Equation of time, Land surface temperature, Trend analysis, Validation
Veranstaltungstitel:36th International Symposium on Remote Sensing of Environment (ISRSE)
Veranstaltungsort:Berlin, Deutschland
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:11 Mai 2015
Veranstaltungsende:15 Mai 2015
Veranstalter :International Society for Photogrammetry and Remote Sensing, DLR
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Fernerkundung der Landoberfläche (alt)
Standort: Neustrelitz
Institute & Einrichtungen:Deutsches Fernerkundungsdatenzentrum > Nationales Bodensegment
Hinterlegt von: Fichtelmann, Dr.rer.nat. Bernd
Hinterlegt am:04 Aug 2015 11:17
Letzte Änderung:24 Apr 2024 20:02

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