scholarly journals A database of global reference sites to support validation of satellite surface albedo datasets (SAVS 1.0)

2016 ◽  
Vol 8 (2) ◽  
pp. 425-438 ◽  
Author(s):  
Alexander Loew ◽  
Ralf Bennartz ◽  
Frank Fell ◽  
Alessio Lattanzio ◽  
Marie Doutriaux-Boucher ◽  
...  
Keyword(s):  
Spatial Heterogeneity ◽  
Satellite Data ◽  
Surface Albedo ◽  
Reference Sites ◽  
Global Database ◽  
Term Stability ◽  
Long Term Stability ◽  
Data Products

Abstract. Validating the accuracy and long-term stability of terrestrial satellite data products necessitates a network of reference sites. This paper documents a global database of more than 2000 sites globally which have been characterized in terms of their spatial heterogeneity. The work was motivated by the need for potential validation sites for geostationary surface albedo data products, but the resulting database is useful also for other applications. The database (SAVS 1.0) is publicly available through the EUMETSAT website (http://savs.eumetsat.int/, doi:10.15770/EUM_SEC_CLM_1001). Sites can be filtered according to different criteria, providing a flexible way to identify potential validation sites for further studies and a traceable approach to characterize the heterogeneity of these reference sites. The present paper describes the detailed information on the generation of the SAVS 1.0 database and its characteristics.

scholarly journals A database of global reference sites to support validation of satellite surface albedo datasets (SAVS 1.0)

2016 ◽  
Author(s):  
Alexander Loew ◽  
Ralf Bennartz ◽  
Frank Fell ◽  
Alessio Lattanzio ◽  
Marie Doutriaux-Boucher ◽  
...  
Keyword(s):  
Spatial Heterogeneity ◽  
Satellite Data ◽  
Surface Albedo ◽  
Reference Sites ◽  
Data Products

Abstract. To validate the accuracy and longterm stability of terrestrial satellite data products, a network of reference sites is required. The present paper documents a database of more than 2000 sites globally which have been characterized in terms of their spatial heterogeneity. The work was motivated by the need for potential validation sites for geostationary surface albedo data products, but the resulting database might be useful also for other applications. The publically available database (SAVS 1.0) is available through the EUMETSAT website (http://savs.eumetsat.int/) and allows to filter the sites according to different criteria. It provides a flexible mean to identify potential validation sites for further studies and a traceable approach to characterize the heterogeneity of these reference sites. The present manuscript describes the detailed information on the generation of the SAVS 1.0 database and its characteristics.

Stability and Surface Uniformity of Selected Thiol-Coated SERS Surfaces

1997 ◽  
Vol 51 (9) ◽  
pp. 1355-1359 ◽  
Author(s):  
Timothy O. Deschaines ◽  
Keith T. Carron
Keyword(s):  
Spatial Heterogeneity ◽  
Sodium Dodecylsulfate ◽  
Surface Wetting ◽  
Thiol Compounds ◽  
Analytical Technique ◽  
Term Stability ◽  
Long Term Stability ◽  
Surface Enhanced Raman ◽  
Coated Surfaces

The use of surface-enhanced Raman scattering (SERS) as an analytical technique continues to grow, but questions about its viability remain. This paper addresses the concern about the long-term stability of the surfaces used with the SERS technique. We have studied the long-term stability of Ag surfaces coated with three different thiol compounds. For this study, we have used 1-propanethiol, 1-do-decanethiol, and p-cresolthiol to coat the Ag surfaces. These surfaces showed long-term stabilities of over a month with minimal surface degradation. In order to mimic a realistic application of SERS, we stored the coated surfaces in a solution of water. Sodium dodecylsulfate (SDS) was added to maintain consistent surface wetting conditions so that reproducible results were obtainable on a day-to-day basis. Spatial heterogeneity of the surfaces and coating was analyzed with a fiber-optic Raman system. The spatial heterogeneity of the surfaces explains the day-to-day variations observed in the detection when the same portion of the surface used for analysis varies from day to day.

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