Title :
How is the angular signature of SMOS brightness temperature different in the morning and evening?
Author :
Hornbuckle, Brian K. ; Rowlandson, Tracy L. ; Patton, Jason C. ; Bramer, Lisa M.
Author_Institution :
Iowa State Univ. of Sci. & Technol., Ames, IA, USA
Abstract :
Evening (6pm) and morning (6am) SMOS observations are different. The greatest difference is for incidence angles less than approximately 30°, but this difference can not be explained with physical models. There is a smaller but significant difference in evening and morning SMOS observations for incidence angles greater than approximately 50°. Evening values of the polarization index are higher than morning values. This difference does have two plausible explanations: either soil moisture has decreased overnight; or vegetation water content has increased overnight.
Keywords :
radiometry; remote sensing; vegetation; SMOS brightness temperature; angular signature; incidence angle; polarization index; vegetation water content; Rough surfaces; Satellites; Soil measurements; Soil moisture; Surface roughness; Vegetation mapping; Microwave radiometry; soil moisture; vegetation water content;
Conference_Titel :
Geoscience and Remote Sensing Symposium (IGARSS), 2011 IEEE International
Conference_Location :
Vancouver, BC
Print_ISBN :
978-1-4577-1003-2
DOI :
10.1109/IGARSS.2011.6049880
