//a tile has been excavated and needs to be updated to a new tile prefab
    //this also draws the new tile, so that each tile can be updated individually and the whole map doesn't have to be redrawn
    public void UpdateTile(byte tileByte, string tileType, Vector2 updatedTileCoords)
    {
        int xCoord = (int)updatedTileCoords.x;
        int yCoord = (int)updatedTileCoords.y;

        //if chosen tileType already equals existing tileType, just update tile's tileByte. tile tile tile tile
        TerrainTile existingTile     = terrainMapArray[xCoord, yCoord].GetComponent <TerrainTile>();
        string      existingTileType = existingTile.tileType;

        if (existingTileType.Equals(tileType))
        {
            existingTile.tileByte = tileByte;
            return;
        }
        existingTile.needUpdatingAndRemoval = true;

        //grab the old tile's screen position information
        //Transform tileScreenTransform = terrainMapArray [xCoord, yCoord].transform;
        //print (tileScreenTransform.position.ToString ());

        //add the appropriate terrain tile (decided elsewhere) to the place in the terrain map array
        GameObject  tileToUse      = FindTerrainTile(tileType);
        TerrainTile tileParameters = tileToUse.GetComponent <TerrainTile> ();

        tileParameters.tileCoords = updatedTileCoords; //give the new tile the old tile's coords
        tileParameters.tileByte   = tileByte;          //give the new tile it's tileByte
        tileParameters.tileType   = tileType;          //give the new tile it's tileType

        //destroy the old tile
        //terrainMapArray [xCoord, yCoord].GetComponent<TerrainTile> ().pendingDestruct = true; //tell the old tile to destroy itself, doesn't work?
        GameObject  tileToDestroy = terrainMapArray[xCoord, yCoord];
        TerrainTile destroyTile   = tileToDestroy.GetComponent <TerrainTile> ();

        destroyTile.PrepForPendingDestruct();

        //add the new tile to the terrainMapArray
        terrainMapArray [xCoord, yCoord] = tileToUse;

        //change depending on the tileScale
        var transformX = xCoord * tileScale;
        var transformY = yCoord * tileScale;

        //change depending on origin
        transformX += origin.x;
        transformY += origin.y;

        //draw the tile
        var temp = Instantiate(terrainMapArray [xCoord, yCoord]) as GameObject;

        temp.transform.position = new Vector3(transformX, transformY, 0.0f);         //ehh might work?

        //update the terrain bool map
        if (tileType.Equals("excavatedTile"))
        {
            terrainBoolMap[xCoord, yCoord] = false;
        }
        else
        {
            terrainBoolMap[xCoord, yCoord] = true;
        }

        //the tile itself should take care of it's parameters for being excavated and such
    }