Sir I am completely new to work on slamm model.so I have the following questions

1.Is Aster DEM is relevant instead of Lidar data.
2.Where to get the MHHW,MLLW DATA?
3.I am working on tidal flat.so how to define the polygon class for the tidal flat?

looking forward for first reply as I am eager to work on this model.
Thank you.