convert from list to float[,] using linq

I need to convert a list to Float[,] array

I have the following classes and data

 public class ThermalData
    {
        public int X { get; set; } //image pixel position x (X-Coordinate)
        public int Y { get; set; } //image pixel position y (Y-Coordinate)
        public double T { get; set; }  //pixel data (Temperature reading)
}


public class FlirImage
{
  public int Width { get; set; }
  public int Height { get; set; }
  public IList<ThermalData> ThermalData{ get; set; }
}

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I currently have a list of each pixel in a 320x240 image that contains an instance of TemperatureData class, which contains the x,y coordinates on image, and the pixels heat reading.

I now need to convert this data a float array without looping through each pixel, is there a very fast efficient linq way of doing this?

This is what i have

And I need something like this

based on the last image, it would be:

 [X-Coordinate, Y-Coordinate] | Temperature reading


Any ideas how i do this?