Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Scattering laws for reflected solar radiation and the characterisation of terrain roughness.
AU - Efford, N. D.
PY - 1993/4
Y1 - 1993/4
N2 - The problems associated with simple models for terrestrial and planetary surface reflectance are discussed and the value of using more rigorous expressions that properly describe the effects of sub-pixel shadowing at low solar zenith angles is emphasised. The use of such expressions will improve the accuracy of theoretical reflectance estimates and could provide information useful in geological mapping, geomorphology, vegetation classification, climatology and micrometeorology. An existing general-purpose roughness correction to radiative transfer models of surface reflectance is considered in some detail, and the relationship of its roughness parameter, θ, to sub-pixel terrain morphology is then explored through the collection and analysis of reflectance measurements from fractal digital terrain models. A well-defined relationship is found to exist between θ and fractal dimension, D, such that, under certain circumstances, knowledge of one may be used to infer the other.
AB - The problems associated with simple models for terrestrial and planetary surface reflectance are discussed and the value of using more rigorous expressions that properly describe the effects of sub-pixel shadowing at low solar zenith angles is emphasised. The use of such expressions will improve the accuracy of theoretical reflectance estimates and could provide information useful in geological mapping, geomorphology, vegetation classification, climatology and micrometeorology. An existing general-purpose roughness correction to radiative transfer models of surface reflectance is considered in some detail, and the relationship of its roughness parameter, θ, to sub-pixel terrain morphology is then explored through the collection and analysis of reflectance measurements from fractal digital terrain models. A well-defined relationship is found to exist between θ and fractal dimension, D, such that, under certain circumstances, knowledge of one may be used to infer the other.
U2 - 10.1080/01431169308904396
DO - 10.1080/01431169308904396
M3 - Journal article
VL - 14
SP - 1055
EP - 1080
JO - International Journal of Remote Sensing
JF - International Journal of Remote Sensing
SN - 1366-5901
IS - 6
ER -