一、工具介绍
https://github.com/cavios/tshydro
tshydro：R package that estimates water level time series from satellite altimetry data.

The core of the package is a state-space model with a mixture distribution to account for erroneous observations.

模型输入：
height
track
time

模型输出：
time
water level
water level sd

二、参考资料
http://lps16.esa.int/posterfiles/paper1290/Altimetry%20for%20inland%20water.pdf

Validation of CryoSat-2 SAR mode based lake levels.