NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Cloud Screening and Quality Control Algorithm for Star Photometer Data: Assessment with Lidar Measurements and with All-sky ImagesThis paper presents the development and set up of a cloud screening and data quality control algorithm for a star photometer based on CCD camera as detector. These algorithms are necessary for passive remote sensing techniques to retrieve the columnar aerosol optical depth, delta Ae(lambda), and precipitable water vapor content, W, at nighttime. This cloud screening procedure consists of calculating moving averages of delta Ae() and W under different time-windows combined with a procedure for detecting outliers. Additionally, to avoid undesirable Ae(lambda) and W fluctuations caused by the atmospheric turbulence, the data are averaged on 30 min. The algorithm is applied to the star photometer deployed in the city of Granada (37.16 N, 3.60 W, 680 ma.s.l.; South-East of Spain) for the measurements acquired between March 2007 and September 2009. The algorithm is evaluated with correlative measurements registered by a lidar system and also with all-sky images obtained at the sunset and sunrise of the previous and following days. Promising results are obtained detecting cloud-affected data. Additionally, the cloud screening algorithm has been evaluated under different aerosol conditions including Saharan dust intrusion, biomass burning and pollution events.
Document ID
20140007388
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Ramirez, Daniel Perez
(Granada Univ. Spain)
Lyamani, H.
(Granada Univ. Spain)
Olmo, F. J.
(Granada Univ. Spain)
Whiteman, D. N.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Navas-Guzman, F.
(Granada Univ. Spain)
Alados-Arboledas, L.
(Granada Univ. Spain)
Date Acquired
June 13, 2014
Publication Date
January 1, 2012
Publication Information
Publication: Atmospheric Measurement Techniques
Publisher: Copernicus Publications
Volume: 5
Subject Category
Earth Resources And Remote Sensing
Meteorology And Climatology
Report/Patent Number
GSFC-E-DAA-TN9353
Funding Number(s)
OTHER: P10-RNM-6299
OTHER: CGL2008-01330-E/CLI
OTHER: EU INFRA-2010-1.1.16-262254
OTHER: CSD2007-00067
OTHER: CGL2010-18782
OTHER: P08-RNM-3568
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
data quality control algorithm
passive remote sensing techniques
cloud screening
No Preview Available