本次实验的目的就是为了用DEM去筛选和过滤全球叶面积指数，然后获取没5天一期的影像。
这里首先看一下影像的叶面积指数的波段信息：
MCD15A3H.006 MODIS Leaf Area Index/FPAR 4-Day Global 500m
Resolution
500 meters
Bands Table
| Name | Description | Min | Max | Wavelength | Scale |
|---|---|---|---|---|---|
| Fpar | FPAR absorbed by the green elements of a vegetation canopy | 0 | 100 | 400-700nm | 0.01 |
| Lai | One-sided green leaf area per unit ground area in broadleaf canopies; one-half the total needle surface area per unit ground area in coniferous canopies | 0 | 100 | 0.1 |
文中的DEM使用的
WWF HydroSHEDS Void-Filled DEM, 3 Arc-Seconds
Resolution
92.77 meters
Bands Table
| Name | Description | Min* | Max* | Units |
|---|---|---|---|---|
| b1 | Eleva |