Estimation of soil moisture in the root-zone from remote sensing data
| Autor: | Bergson Guedes Bezerra, Carlos Antonio Costa dos Santos, Bernardo Barbosa da Silva, Aldrin Martin Perez-Marin, Marcus Vinícius Cândido Bezerra, José Renato Cortez Bezerra, Tantravahi Venkata Ramana Rao |
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| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Revista Brasileira de Ciência do Solo, Vol 37, Iss 3, Pp 596-603 (2013) |
| Druh dokumentu: | article |
| ISSN: | 1806-9657 0100-0683 |
| DOI: | 10.1590/S0100-06832013000300005 |
| Popis: | Field-based soil moisture measurements are cumbersome. Thus, remote sensing techniques are needed because allows field and landscape-scale mapping of soil moisture depth-averaged through the root zone of existing vegetation. The objective of the study was to evaluate the accuracy of an empirical relationship to calculate soil moisture from remote sensing data of irrigated soils of the Apodi Plateau, in the Brazilian semiarid region. The empirical relationship had previously been tested for irrigated soils in Mexico, Egypt, and Pakistan, with promising results. In this study, the relationship was evaluated from experimental data collected from a cotton field. The experiment was carried out in an area of 5 ha with irrigated cotton. The energy balance and evaporative fraction (Λ) were measured by the Bowen ratio method. Soil moisture (θ) data were collected using a PR2 - Profile Probe (Delta-T Devices Ltd). The empirical relationship was tested using experimentally collected Λ and θ values and was applied using the Λ values obtained from the Surface Energy Balance Algorithm for Land (SEBAL) and three TM - Landsat 5 images. There was a close correlation between measured and estimated θ values (p |
| Databáze: | Directory of Open Access Journals |
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