cross-comparison of modis and cloudsat data as a tool to validate local cloud cover maskscross-comparison modis和叫做数据作为一种工具来验证本地云层面具.pdfVIP

Atmosphere 2011, 2, 242-255; doi:10.3390/atmos2030242 OPEN ACCESS atmosphere ISSN 2073-4433 /journal/atmosphere Article Cross-Comparison of MODIS and CloudSat Data as a Tool to Validate Local Cloud Cover Masks Claudia Notarnicola 1,*, Daniela Di Rosa 2 and Francesco Posa 2  1 EURAC-Institute for Applied Remote Sensing, Viale Druso, 1 39100 Bolzano, Italy 2 Physics Department, Bari Politechnic, Via Amendola, 173 70126 Bari, Italy; E-Mails: daniela_dirosa@yahoo.it (D.D.R.); posa@ba.infn.it (F.P.) * Author to whom correspondence should be addressed; E-Mail: claudia.notarnicola@; Tel.: +39-0471-055375; Fax: +39-0471-055389. Received: 1 June 2011; in revised form: 26 June 2011 / Accepted: 5 July 2011 / Published: 22 July 2011 Abstract: This paper presents a cross-comparison of the data acquired by the MODIS and CloudSat sensors in order to understand the limit of the developed cloud-mask algorithm and to provide a quantitative validation assessment of cloud masks by using exclusively remotely sensed data. The analysis has been carried out by comparing both the intermediate levels of the cloud mask such as the brightness temperatures and the reflectance values for different channels, and the cloud mask itself with the cloud profiles as measured by the CloudSat sensor. The comparison between MODIS cloud tests and the CloudSat profiles indicates an agreement with hit rates (H) and Hanssen-Kuiper Skill Score (KSS) varying between 0.7 and 1.0 and 0.4 and 1.0, respectively. In this