Estimation of soil moisture in the root-zone from remote sensing data
Estimation of soil moisture in the root-zone from remote sensing data
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DOI：
10.1590/s0100-06832013000300005
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发表时间：
2013-06-01
期刊：
影响因子：
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通讯作者：
Rao, Tantravahi Venkata Ramana
中科院分区：
文献类型：
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作者：
Bezerra, Bergson Guedes;Santos, Carlos Antonio Costa dos;Rao, Tantravahi Venkata Ramana
现场土壤湿度测量很麻烦。因此，需要遥感技术，因为可以对现有植被根区的土壤湿度深度进行实地和景观尺度测绘。该研究的目的是评估根据巴西半干旱地区阿波迪高原灌溉土壤遥感数据计算土壤湿度的经验关系的准确性。这种经验关系此前已在墨西哥、埃及和巴基斯坦的灌溉土壤中进行过测试，并取得了可喜的结果。在这项研究中，根据从棉田收集的实验数据评估了这种关系。试验在5公顷的灌溉棉花区域进行。通过鲍文比法测量能量平衡和蒸发分数(L)。使用 PR2 - Profile Probe (Delta-T Devices Ltd) 收集土壤湿度 (q) 数据。使用实验收集的 L 和 q 值测试经验关系，并使用从陆地表面能量平衡算法 (SEBAL) 和三幅 TM - Landsat 5 图像获得的 L 值进行应用。测量的 q 值和估计的 q 值之间存在密切相关性 (p
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 (L) were measured by the Bowen ratio method. Soil moisture (q) data were collected using a PR2 - Profile Probe (Delta-T Devices Ltd). The empirical relationship was tested using experimentally collected L and q values and was applied using the L 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 q values (p