Ground Textures - Help!!!

Is anyone else as confused as me how to set these ground texture values.

Basically I have a sim where the land is mainly low-lying islands, spread all over the sim, at around 23m max. All I want is for the land to be grassy, and beneath the sea-level to be sand.

I have the sand and grass textures, so my questions are:

1) Into which of the 1, 2, 3, 4 boxes should I put the sand and grass textures?

2) What values do I need for the SW, NW, SE and NE?

Please help )

Front

Sorry your question got pushed off the front page before it was answered.

Unless you want the land in different corners to look differently, use the same numbers for each corner. Assuming the water is at 20m, put the sand in the lowest texture and set the lowest texture to stop at 20m. You can use grass for the other 3, or leave the top 2 as they are if your land height doesn't go up high enough to get those textures to show up.

The part that can get extremely frustrating is that SL will automatically include a region around where the sand and grass textures meet to blend the 2 together. You can't really change that. I wanted wet sand up to the water level, sand around the edge of my island, and grass in the middle, with only a couple meters difference from the middle of the island to the edge. It's impossible apparently. All you can do is make it somewhere close, accept it, and start working on the rest of the island.