How to import map into Online maps？

using System;
using System.Text;
using UnityEngine;

public class HuadongArcGIS:MonoBehaviour
{
    private int zoomOffset = 6;
    private int xOffset = 22;
    private int yOffset = 1;

    private OnlineMaps map;

    private void Start()
    {
        map = OnlineMaps.instance;
        map.OnStartDownloadTile += OnStartDownloadTile;
        if (OnlineMapsCache.instance != null) OnlineMapsCache.instance.OnStartDownloadTile += OnStartDownloadTile;
    }

    private void OnStartDownloadTile(OnlineMapsTile tile)
    {
        int zoom = tile.zoom - zoomOffset;
        if (zoom < 0)
        {
            tile.status = OnlineMapsTileStatus.error;
            return;
        }

        tile.status = OnlineMapsTileStatus.loading;

        StringBuilder builder = new StringBuilder("http://www.cjyhgl.com:6080/arcgis/rest/services/huadong1/MapServer/tile/");
        builder.Append(zoom).Append("/").Append(tile.y - yOffset * (1 << zoom)).Append("/").Append(tile.x - xOffset * (1 << zoom));

        OnlineMapsWWW www = OnlineMapsUtils.GetWWW(builder);
        www.OnComplete += delegate
        {
            if (string.IsNullOrEmpty(www.error))
            {
                Texture2D tileTexture = new Texture2D(256, 256, TextureFormat.ARGB32, map.control.mipmapForTiles);
                tileTexture.LoadImage(www.bytes);
                tileTexture.wrapMode = TextureWrapMode.Clamp;

                if (map.target == OnlineMapsTarget.texture)
                {
                    tile.ApplyTexture(tileTexture);
                    map.buffer.ApplyTile(tile);
                    OnlineMapsUtils.DestroyImmediate(tileTexture);
                }
                else
                {
                    tile.texture = tileTexture;
                    tile.status = OnlineMapsTileStatus.loaded;
                }

                tile.MarkLoaded();
                map.Redraw();
            }
            else
            {
                tile.status = OnlineMapsTileStatus.error;
            }
        };
    }
}