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The accuracy of global L-band soil moisture (SM) and vegetation optical depth (L-VOD) products retrieved through the τ-ω model is highly dependent on temperature inputs obtained from model-based temperature products. However, the performance of these temperature products in the retrieval of global-scale SM and L-VOD has not yet been evaluated. Therefore, this study aimed to evaluate four commonly used model-based temperature products as input to the SMAP-INRAE-BORDEAUX (SMAP-IB) algorithm for retrieving SM and L-VOD. Specifically, we investigated differences in SMAP-IB retrievals of SM and L-VOD using four model-based temperature sources as input, along with four configurations concerning the parameterization of effective soil (T_G) and vegetation (T_C) temperatures. Triple collocation analysis (TCA) results showed that SM retrievals based on GLDAS temperatures (SM_GLDAS), with T_C set …