SetHeights out of memory

Hi,

I'm getting out of memory errors with the following code:

   var www_tex : WWW = new WWW(Globals.url + "heightmap.png");
   yield www_tex;
 
   var tex = www_tex.texture;
   map  = new float[2048,2048];
   for (var y:int=0; y<2048;y++) {
     for (var x:int=0; x<2048;x++) {
       map[x,y] = tex.GetPixel(x,y).grayscale;
     }
   }
   AudioListener.pause = true;
   var t : Terrain = Terrain.activeTerrain;
   t.terrainData.SetHeights(0,0, map);
   AudioListener.pause = false;

Because the out of memory error only displays after I ran this code a few hundred times I wonder if a memory leak could be the culprit. I tried to run it against the Profiler but the minute I run it, my computer slows down to unusable speed. I also tried to enable Profiler by code but the same problem occurs.

Second, shouldn't SetHeights update or delete/write new terrainData every time? Any ideas how to optimize this?

Thank you.