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Comparison and enhancement of MODIS cloud mask products for Southeast Asia

Leinenkugel, Patrick und Künzer, Claudia und Dech, Stefan (2013) Comparison and enhancement of MODIS cloud mask products for Southeast Asia. International Journal of Remote Sensing, 34 (8), Seiten 2730-2748. DOI: 10.1080/01431161.2012.750037.

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Kurzfassung

Accurate quality information on cloud occurrence is of utmost importance for a wide range of remote-sensing applications and analyses. This study compares the two existing cloud mask products available for the Moderate Resolution Imaging Spectroradiometer (MODIS), stored in the quality layer of the MOD09 daily surface reflectance product. For both masks, statistics on cloud occurrence are calculated for 1 year of daily surface reflectance data covering the area of southeast Asia. Furthermore, a cloud mask enhancement algorithm is presented for increasing cloud flag reliability by effectively combining the existing cloud labels together with the utilization of annual statistics based on the blue reflectance band. Furthermore, since a lot of compositing algorithms rely on cloud mask information for the filtering of unsuitable observations, the influence of the different cloud masks on 8-day MOD09A1 composite outputs is examined with respect to data availability and average view angles. The results of the statistical analysis show that the accuracy of the two cloud mask products differs significantly for southeast Asia. Particularly, the radiative influence of land cover proves to strongly affect the reliability of the cloud flags, although to varying degrees throughout the year. The enhancement algorithm successfully identifies undetected clear observations in the original masks while simultaneously setting upper limits for atmospheric contamination. In this manner, considerably higher proportions of cloud-free observations can be retained compared to a clear-sky conservative combination of the masks as applied in other compositing algorithms.

Dokumentart:Zeitschriftenbeitrag
Titel:Comparison and enhancement of MODIS cloud mask products for Southeast Asia
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Leinenkugel, Patrickpatrick.leinenkugel@dlr.de
Künzer, Claudiaclaudia.künzer@dlr.de
Dech, Stefanstefan.dech@dlr.de
Datum:20 April 2013
Erschienen in:International Journal of Remote Sensing
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:34
DOI :10.1080/01431161.2012.750037
Seitenbereich:Seiten 2730-2748
Name der Reihe:Taylor & Francis
Status:veröffentlicht
Stichwörter:MODIS, clouds, Southeast Asia,
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
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Deutsches Fernerkundungsdatenzentrum > Landoberfläche
Hinterlegt von: Patrick Leinenkugel
Hinterlegt am:14 Feb 2013 09:46
Letzte Änderung:14 Feb 2013 09:46

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