Terrain texture

[Rolig Loon]

You don't, at least not unless you are very skilled or very lucky.  Terrain textures apply to the entire region. If you have planned well ahead so that the half you want to texture is in a different elevation band than anything on the other half of the region, you might be able to change that single texture without messing up the rest of the region.  I can only see that happening if your half is all very high or very low.  Otherwise, your only option is to apply a mesh cap over your entire half and texture that mesh as if it were the real landscape.

You might want to read http://wiki.secondlife.com/wiki/Creating_Terrain_Textures

[Rolig Loon]

You don't, at least not unless you are very skilled or very lucky.  Terrain textures apply to the entire region. If you have planned well ahead so that the half you want to texture is in a different elevation band than anything on the other half of the region, you might be able to change that single texture without messing up the rest of the region.  I can only see that happening if your half is all very high or very low.  Otherwise, your only option is to apply a mesh cap over your entire half and texture that mesh as if it were the real landscape.

You might want to read http://wiki.secondlife.com/wiki/Creating_Terrain_Textures

[Alwin Alcott]

not possible on sim level, it will effect whole sim, how much is a bit depending on land height levels.

Only way you can do this without changing the other half is using artificial landscaping = mesh or megaprims as ground level.

[Amethyst Jetaime]

There is a tool that you can use to do this.  It maps your land and puts prims that follow it over it which you can then texture. I can't recommend a product here by name so you'll have to search MP for it using "land texture" as your search key words.