Analytical Relationship between Two-Band Spectral Vegetation Indices Measured at Multiple Sensors on a Parametric Representation of Soil Isoline Equations
Analytical Relationship between Two-Band Spectral Vegetation Indices Measured at Multiple Sensors on a Parametric Representation of Soil Isoline Equations
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DOI：
10.3390/rs11131620
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发表时间：
2019-07
期刊：
影响因子：
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通讯作者：
Kenta Taniguchi;K. Obata;H. Yoshioka
中科院分区：
文献类型：
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作者：
Kenta Taniguchi;K. Obata;H. Yoshioka
不同传感器的波长带规格之间的差异将系统差异引入光谱植被指数（VI）的值。这种相对误差必须在数据采集之后基于测量之间的关系在算法上最小化。这项研究介绍了一种技术，用于推导出两个传感器的维斯之间的分析关系。推导过程中使用的参数形式的土壤等值线方程，其中涉及两个不同波长的反射率。首先，从概念上解释推导步骤。接下来，通过假设两波段VI的一般形式，将概念步骤投射到实际推导中。最后，推导出的表达式进行了数值验证，使用耦合的叶片和冠层辐射传输模式。结果表明，推导的表达式减少了从两个传感器获得的VI值之间的原始差异，表明推导的表达式的有效性。推导的表达式和数值结果表明，不同波长下测量的维斯指数之间的关系是不同的土壤反射光谱下的植被冠层。这些结果表明，需要谨慎时，检索intersensor VI的关系，由土壤表面具有独特的光谱区域。
Differences between the wavelength band specifications of distinct sensors introduce systematic differences into the values of a spectral vegetation index (VI). Such relative errors must be minimized algorithmically after data acquisition, based on a relationship between the measurements. This study introduces a technique for deriving the analytical relationship between the VIs from two sensors. The derivation proceeds using a parametric form of the soil isoline equations, which relate the reflectances of two different wavelengths. First, the derivation steps are explained conceptually. Next, the conceptual steps are cast in a practical derivation by assuming a general form of the two-band VI. Finally, the derived expressions are demonstrated numerically using a coupled leaf and canopy radiative transfer model. The results confirm that the derived expression reduced the original differences between the VI values obtained from the two sensors, indicating the validity of the derived expressions. The derived expressions and numerical results suggested that the relationship between the VIs measured at different wavelengths varied with the soil reflectance spectrum beneath the vegetation canopy. These results indicate that caution is required when retrieving intersensor VI relationships over regions consisting of soil surfaces having distinctive spectra.