11/20
一次性导出每年的EVImax?
已解决，写循环
Export Error: Pixel type not supported: Type. Convert the image to a floating point type or a smaller integer type, for example, using ee.Image.toDouble().
已解决，使用.select()选取要导出的波段即可
原因：导出波段格式不一致。
All bands must be of same pixelType - so cast to best fit before export.Ex: Cast image of bands [int16 and int32] to int32.
constant？
"X" is not defined in this scope?
A variable needs to be available in the current context of execution.
Variables defined inside a function cannot be accessed from anywhere outside the function, because the variable is defined only in the scope of the function.
最大NDVI像素合成qualitymosaic( )和Reducer.max( )结果是一样的吗?
两种方法的思路是一样的，但结果不一样。
Reducer.max( )得到的单一波段值，即最大NDVI值；
QualityMosaic( )得到的是最大NDVI值条件下相关通道的对应值，结果中与原数据的波段数目一致，可以得到最大NDVI条件下的彩色合成图。