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Comparison and enhancement of MODIS cloud mask products for Southeast Asia

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

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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.

Document Type:Article
Title:Comparison and enhancement of MODIS cloud mask products for Southeast Asia
AuthorsInstitution or Email of Authors
Leinenkugel, Patrickpatrick.leinenkugel@dlr.de
Künzer, Claudiaclaudia.künzer@dlr.de
Dech, Stefanstefan.dech@dlr.de
Date:20 April 2013
Journal or Publication Title:International Journal of Remote Sensing
Refereed publication:Yes
In Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 2730-2748
Series Name:Taylor & Francis
Keywords:MODIS, clouds, Southeast Asia,
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Fernerkundung der Landoberfläche
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center > Land Surface
Deposited By: Patrick Leinenkugel
Deposited On:14 Feb 2013 09:46
Last Modified:14 Feb 2013 09:46

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