There is a bug in uploading downloading raw terrain files.
take any terrain file, use smooth 3 times on the entire sim
stand next to and look at an area where the water meets the land, preferably curvy
take a photo
download your terrain file
upload the same terrain file
take another photo and compare the 2 photos....the second photo will have much rougher edges
i've attached an example
ETA: I did, i hope someone looks into this! thx!