TY - JOUR
T1 - Comparison of backscattering models at L-band for growing corn
AU - Monsivais-Huertero, Alejandro
AU - Judge, Jasmeet
N1 - Funding Information:
Manuscript received October 9, 2009; revised February 23, 2010 and April 19, 2010; accepted April 23, 2010. Date of publication June 21, 2010; date of current version December 27, 2010. This work was supported by the NASA-Terrestrial Hydrology Program (THP)-NNX09AK29G. Partial support for MicroWEX-5 was obtained from the National Science Foundation’s Earth Science Division (EAR-0337277) and the NASA New Investigator Program (NASA-NIP-00050655).
PY - 2011/1
Y1 - 2011/1
N2 - The impact of incoherent and coherent formulations on estimates of terrain backscatter (σ0terrain) at L-band for a growing season of corn is examined. The average root mean square difference (RMSD) between the two formulations over the growing season ranged between 34 dB, with higher RMSDs at HH polarization (pol), indicating the presence of coherent effects. In the incoherent model, the direct scattering from stems was the primary mechanism, while in the coherent formulation, the interactions between the stems and soil were the primary mechanisms due to the coherent effects. Both incoherent and coherent formulations estimated equally high sensitivities of (σ0terrain) to soil moisture (SM) during early stage under low vegetation conditions. During the early and mid stages, the (σ0terrain) estimated by both formulations exhibited higher sensitivities during dry conditions than wet conditions. In contrast, during the reproductive stage, the (σ0terrain) by the incoherent formulation was more sensitive to the SM at wet conditions than at dry conditions. Based upon the ALOS/SMAP accuracy for (σ 0terrain), the incoherent formulation exhibited the highest sensitivity during the early stage with detection of SM changes as low as 2 vol% for dry condition, whereas the coherent formulation exhibited the highest sensitivity during the mid stage with detection of SM changes as low as 2.5 vol%. The results of this study suggest that the coherent effects should be considered for defining accuracy of SM estimation algorithms for corn at L-band.
AB - The impact of incoherent and coherent formulations on estimates of terrain backscatter (σ0terrain) at L-band for a growing season of corn is examined. The average root mean square difference (RMSD) between the two formulations over the growing season ranged between 34 dB, with higher RMSDs at HH polarization (pol), indicating the presence of coherent effects. In the incoherent model, the direct scattering from stems was the primary mechanism, while in the coherent formulation, the interactions between the stems and soil were the primary mechanisms due to the coherent effects. Both incoherent and coherent formulations estimated equally high sensitivities of (σ0terrain) to soil moisture (SM) during early stage under low vegetation conditions. During the early and mid stages, the (σ0terrain) estimated by both formulations exhibited higher sensitivities during dry conditions than wet conditions. In contrast, during the reproductive stage, the (σ0terrain) by the incoherent formulation was more sensitive to the SM at wet conditions than at dry conditions. Based upon the ALOS/SMAP accuracy for (σ 0terrain), the incoherent formulation exhibited the highest sensitivity during the early stage with detection of SM changes as low as 2 vol% for dry condition, whereas the coherent formulation exhibited the highest sensitivity during the mid stage with detection of SM changes as low as 2.5 vol%. The results of this study suggest that the coherent effects should be considered for defining accuracy of SM estimation algorithms for corn at L-band.
KW - Backscatter for dynamic vegetation
KW - coherent and incoherent scattering models
KW - soil moisture sensitivity
KW - soil moisture(SM)
UR - http://www.scopus.com/inward/record.url?scp=78650927433&partnerID=8YFLogxK
U2 - 10.1109/LGRS.2010.2050459
DO - 10.1109/LGRS.2010.2050459
M3 - Artículo
SN - 1545-598X
VL - 8
SP - 24
EP - 28
JO - IEEE Geoscience and Remote Sensing Letters
JF - IEEE Geoscience and Remote Sensing Letters
IS - 1
M1 - 5491065
ER -