Question Magician needed for texturing from csv data values

Hi, I'm struggling with a problem and I don't know how to remedy it, I've tried many reverse engineering methods but I'm not able to remedy it. It puts a big wall in front of me that is impossible to get around.... so I turn to you.
In order not to complicate things for a potential wizard who will solve my problem with the snap of a finger, I will provide the most important information.
I have a 2048x2048 terrain generated from a RAW map, and texture record. The problem is precisely in what format I have the locations of the various textures represented. I know that for this map the list of them looks like this:

Size: 2048
Texture
#0 Earth.tga
#1 Rock.tga
#2 jungle_Grass.tga
#3 Road.tga
#4 Ground.tga
#5 Earthdirty.tga
#6 Earth_Root.tga

And then we have the notation itself where the texture is. From what I understand it is a text expressing a two-dimensional array that has 2048 columns and rows. An example of a small fragment.



How do I superimpose the corresponding texture values from a two-dimensional array onto the terrain?
Thanks!

 

This solution is written in raw C# .NET6 simply it converts csv to bmp by creating 2D array but for purposes of example i simply used colors instead of materials

Code (CSharp):

1. using System.Drawing;
2.  
3. string filePath = @"C:\Users\Maria\Desktop\22.csv";
4. StreamReader sr = new StreamReader(filePath);
5. var lines = new List<string[]>();
6. int Row = 0;
7. while (!sr.EndOfStream)
8. {
9.     string[] Line = sr.ReadLine().Split(';');
10.     lines.Add(Line);
11.     Row++;  
12. }
13.  
14. string[][] data = lines.ToArray();
15. foreach (string cell in data[0])
16. {
17. Console.Write(cell + "\n");
18. }
19.  
20. Bitmap image;
21. image = new Bitmap(1025,1025,System.Drawing.Imaging.PixelFormat.Format32bppArgb);
22.  
23. for (int i = 0; i < image.Width; i++)
24. {
25.     for (int j = 0; j < image.Height; j++)
26.     {      
27.         switch (data[i][j])
28.         {
29.             case "0":
30.                 {
31.                     image.SetPixel(i, j, Color.Black);
32.                     break;
33.                 }
34.             case "1":
35.                 {
36.                     image.SetPixel(i, j, Color.Red);
37.                     break;
38.                 }
39.             case "2":
40.                 {
41.                     image.SetPixel(i, j, Color.Blue);
42.                     break;
43.                 }
44.             case "3":
45.                 {
46.                     image.SetPixel(i, j, Color.Yellow);
47.                     break;
48.                 }
49.             case "4":
50.                 {
51.                     image.SetPixel(i, j, Color.Magenta);
52.                     break;
53.                 }
54.             case "5":
55.                 {
56.                     image.SetPixel(i, j, Color.Cyan);
57.                     break;
58.                 }
59.             case "6":
60.                 {
61.                     image.SetPixel(i, j, Color.White);
62.                     break;
63.                 }
64.         }      
65.     }
66. }
67. image.Save(@"C:\Users\Maria\Desktop\22.bmp");