Global LAnd Surface Satellite (GLASS) Products by Shunlin Liang Xiaotong Zhang Zhiqiang Xiao Jie Cheng Qiang Liu & Xiang Zhao

Author:Shunlin Liang, Xiaotong Zhang, Zhiqiang Xiao, Jie Cheng, Qiang Liu & Xiang Zhao
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Table 4.2Bias and RMS of estimates obtained using different spectral domains

Spectral domain (μm)

Bias (W/m2)

RMSE (W/m2)

T 1

T 2

T 3

T 1

T 2

T 3

4–100

4.212

3.979

3.725

5.387

5.140

4.871

3–100

4.460

4.388

4.322

5.679

5.618

5.562

2.5–100

4.459

4.393

4.336

5.676

5.624

5.578

2.5–200

0.928

0.920

0.912

0.993

0.984

0.977

1–200

0.929

0.921

0.914

0.993

0.986

0.979

T 1 = T a, T 2 = T a + 8, and T 3 = T a + 15

BBE values were first calculated for the 2.5–200 μm, 3–14 μm, 8–12 μm, 8–13.5 μm, and 8–14 μm spectral domains using Eq. (4.5). BBE is not sensitive to surface temperature (Ogawa and Schmugge 2004), and therefore, the surface temperature was defined as the average Earth’s surface temperature (300 ºK). Equation (4.3) was then used to calculate for the 2.5–200 μm spectral domain with these five BBE domains mentioned earlier. The spectral range for calculating in Eq. (4.3) was 2.5–200 μm.

The accuracy for each spectral domain is presented in Table 4.3. The 3–14 μm spectral domain had the largest bias. Although it had the lowest RMSE, the difference between its RMSE and those of the other spectral domains was not significant. The 8–12 μm spectral domain had the largest RMSE and had a negative bias with an absolute value lower only than that of the 3–14 μm spectral domain. The 3–14 μm and 8–12 μm spectral domains were found to be inappropriate for calculating for the 2.5–200 μm spectral domain. The 8–13.5 μm spectral domain had the minimum bias and an acceptable RMS. The average bias and RMSE for this domain were 0.001 and 1.184 W/m2, respectively. The bias of the 8–14 μm spectral domain was larger than that of the 8–13.5 μm spectral domain, and the RMSE of the 8–14 μm spectral domain was slightly less than that of the 8–13.5 μm spectral domain. Therefore, the BBE value of the 8–13.5 μm spectral domain was the best for calculating value of the 2.5–200 μm spectral domain. Using these simulation data, the accuracy of the 2.5–200 μm calculated using the 8–13.5 μm BBE to replace all-wavelength was investigated. In this case, the average bias and RMSE were 1.473 and 2.746 W/m2, respectively.Table 4.3Bias and RMS when estimating at 2.5–200 μm using the BBE for different spectral domains

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