terrain mapping... used program called easygen
http://www.sendspace.com/file/fr3lexthis is the vid..
with this program you can blend textures i chose not to cause it wasnt necessary for me. when u watch it you'll notice that when exporting it to a .map file it tells u to make a shader file.. you have to do this.. basically name it whatever ur map name is. for the alphamap with radiant u dont need it, so save it on desktop or something then delete it later.
since it was a single textured terrain, once i imported it to gtk i changed it into an worldspawn entity, so it wouldnt be rendered as an terrain entity. then i re-textured the face only to the texture i thought suited best (i will most likely change what i used and use something more fitting the environment)
but with this program u can blend textures.. its very easy to use i leanred it in about 20 minutes. if ud like i can make a vid of blending textures.