Question Terrain not having different terraindatas

I have a problem I need help with, I am trying to instantiate multiple terrain objects through script. Then I am trying to create a new terrain asset through another script which will control the random terrain's properties, however, all of the terrains are sharing the same terrain properties even though they must technically have different terrain properties. How do I create terrain data assets dynamically? Pls help with this, thank you.

public int width = 64;
public int length = 64;
public float heightScale = 20f;
public float maxHeight = 10f;
private Terrain terrain;
private void Start()
{
GenerateRandomTerrain();
}
private void GenerateRandomTerrain()
{
TerrainData terrainData = new TerrainData();
terrainData.heightmapResolution = width + 1;
int heightmapWidth = terrainData.heightmapResolution;
int heightmapHeight = terrainData.heightmapResolution;
float[,] heights = new float[heightmapWidth, heightmapHeight];
for (int y = 0; y < heightmapHeight; y++)
{
for (int x = 0; x < heightmapWidth; x++)
{
float height = Mathf.PerlinNoise(x / (float)width * heightScale, y / (float)length * heightScale) * maxHeight;
heights[x, y] = height / maxHeight;
}
}
terrainData.SetHeights(0, 0, heights);
Vector3 terrainSize = terrainData.size;
terrainSize.x = width;
terrainSize.z = length;
terrainData.size = terrainSize;
terrain.terrainData = terrainData;
}

this is the terrain code.

 

If you post a code snippet, ALWAYS USE CODE TAGS:

How to use code tags: https://forum.unity.com/threads/using-code-tags-properly.143875/

The steps to clone TerrainData is simply to Instantiate<T>() a fresh copy of it and reassign it to your Terrain, and possibly your TerrainCollider if you want.

Code (csharp):

1. TerrainData terrainData = Instantiate<TerrainData>( terrain.terrainData);
2.  
3. // TODO: change your terrainData here...
4.  
5. terrain.terrainData = terrainData;

Here's another example of manipulating TerrainData:

 

Thanks for helping but the problem still persists all of the terrain objects have the same terrain
All these terrain look the same