3.2.4. Spatial Distribution of Standard Deviation (SD) and Relative Standard Deviation (RSD)

Figure 10 displays the standard deviation (SD) and relative standard deviation (RSD) among the four climatologies at the pixel level. From Figure 10a, we found a high discrepancy in southern China, while a small SD was mainly located in northern China (gray). Most of the high SD values are in the range of 0.5~1 and occur in southern regions, with values between 1 and 2 mainly occurring in southern regions in a temperate climate zone. Values between 2 and 3 mostly occur in southeast Tibet (red rectangle in Figure 10a) and Taiwan (blue polygon in Figure 10a) in temperate climate zones with mixed, broadleaf, and needleleaf forest. The largest SD, ranging from 3 to 4, is also distributed in the southeast of Tibet and Taiwan province, which is in line with former findings (Section 3.2.2).

**Figure 10.** Standard deviation and relative standard deviation of the four products: (**a**) Standard deviation; (**b**) relative standard deviation.

However, in view of the fact that different biome types have different LAI magnitudes, the relative standard deviation (RSD) needs to be computed to eliminate the background effect, and the relative standard deviation (RSD) is standard deviation (SD) divided by mean LAI of the four products. In Figure 10b, we set four levels of relative standard deviation, being 0~0.1, 0.1~0.5, 0.5~1, and 1~2. For most of the pixels, the RSD are in the range of 0.1~0.5, which can be seen as an acceptable discrepancy (grey color). The lowest difference (0~0.1) pixels are mainly located in northeast China. The highest differences (0.5~2) occur in southern Tibet and Sichuan basin with mixed forest and grass land cover types, and northern Tibet in the biome ecotone of grassland and barren (blue and red rectangles in Figure 10b).
