- Title
- A Comparison of Passive Microwave Emission Models for Estimating Brightness Temperature at L- and P-Bands under Bare and Vegetated Soil Conditions
- Creator
- Brakhasi, Foad; Walker, Jeffrey P.; Kerr, Yann H.; Jackson, Thomas J.; Judge, Jasmeet; Liu, Pang-Wei; Shen, Xiaoji; Ye, Nan; Wu, Xiaoling; Yeo, In-Young; Boopathi, Nithyapriya; Kim, Edward
- Relation
- IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing Vol. 17, p. 2570-2585
- Publisher Link
- http://dx.doi.org/10.1109/JSTARS.2023.3344764
- Publisher
- Institute of Electrical and Electronics Engineers (IEEE)
- Resource Type
- journal article
- Date
- 2024
- Description
- P-band radiometry has been demonstrated to have a deeper sensing depth than L-band, making the consideration of multilayer microwave interactions necessary. In addition, the scattering and phase interference effects are different at the P-band, requiring a reconsideration of the need for coherent models. However, the impact remains to be clarified, and understanding the validity and limitations of these models at both L- and P-bands is crucial for their refinement and application. Therefore, two general categories of microwave emission models, including two stratified coherent models (Njoku and Wilhite) and four incoherent models (conventional tau-omega model and three multilayer models being zero-order, first-order, and incoherent solution), were intercompared for the first time on the same dataset. This evaluation utilized observations of L- and P-bands radiometry under different land cover conditions from a tower-based experiment in Victoria, Australia. Model estimations of brightness temperature (TB) were consistent with measurements, with the lowest root mean square error (RMSE) at P-band V-polarization under corn (2 K) and the highest RMSE at L-band H-polarization under bare soil (13 K). Coherent models performed slightly better than incoherent models under bare soil (3 K less RMSE), while the opposite was true under vegetated soil conditions (1 K less RMSE). Coherent and incoherent models showed maximum differences (3 K at P-band and 2 K at L-band), correlating strongly with soil moisture variations at 0–10 cm. Findings suggest that coherent and incoherent models performed similarly; thus, incoherent models may be preferable for estimating TB at L- and P-bands due to reduced computational complexity.
- Subject
- coherent; incoherent; L-band; passive microwave; P-band; soil moisture profile
- Identifier
- http://hdl.handle.net/1959.13/1505551
- Identifier
- uon:55679
- Identifier
- ISSN:1939-1404
- Rights
- x
- Language
- eng
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