Paper Info
Title
Effect of Soil Moisture on the Angular Variation of Thermal Infrared Emissivity of Inorganic Soils
Abstract
Emissivity is influenced by different factors. This study deals with the effect of the soil moisture (SM) content on the zenithal (θ) variation of ratio-to-nadir emissivity (εr), for a wide variety of inorganic bare soils. To retrieve εr, a goniometer assembly was used, together with two identical CIMEL Electronique CE312-2 radiometers working at six spectral bands within 7.7-14.3 μm, performing simultaneous radiance measurements at different combinations of zenith and azimuth angles. The results showed that the effect of SM upon εr(θ) is different depending on the spectral range and textural composition of the sample. Sandy soils showed a decrease of εr(θ) from nadir up to 0.132 for θ ≥ 40° at 8-9.4 μm under dry conditions, but this decrease was reduced to 0.093 with the increase of SM. Clayey samples did not present dependence of εr(θ) on SM. Loamy texture samples presented a more sharp decrease of εr(θ) with the increase of SM, reaching differences between nadir values and 70 ° up to 6%, at all spectral ranges studied. Finally, a parameterization of εr with SM and θ was derived allowing to obtain ratio-to-nadir emissivities with an accuracy of ± 0.011.
Year
DOI
Venue
2014
10.1109/LGRS.2013.2286747
Geoscience and Remote Sensing Letters, IEEE  
Keywords
Field
DocType
soil,CIMEL Electronique CE312-2 radiometers,azimuth angles,clayey samples,goniometer assembly,inorganic bare soils,loamy texture samples,ratio-to-nadir emissivities,ratio-to-nadir emissivity zenithal variation,soil moisture content,soil moisture effect,thermal infrared emissivity,zenith angles,Angular emissivity,bare soil,remote sensing,soil moisture (SM),thermal infrared (TIR)
Nadir,Remote sensing,Water content,Spectral bands,Emissivity,Mathematics,Radiance,Loam,Soil water,Zenith
Journal
Volume
Issue
ISSN
11
6
1545-598X
Citations 
PageRank 
References 
2
0.45
4
Authors
4
Name
Order
Citations
PageRank
Garcia-Santos, V.171.58
Valor, E.281.97
Vicente Caselles313922.32
César Coll49216.27