Google 地图下载工具 (C#)
这是一个用于下载 Google 地图的小工具，相关内容参见 https://on4wp7.codeplex.com/ 。

//// Google Map Tiles Downloader in C# by coolypf// No rights reserved, neither warranty nor guarantee//using System;using System.Collections.Generic;using System.Drawing;using System.Net;namespace GMapsDownloader{    class Program    {        const double EarthRadius = 6378137;        const double MinLatitude = -85.05112878;        const double MaxLatitude = 85.05112878;        const double MinLongitude = -180;        const double MaxLongitude = 180;        const string NameFormat = "{0}-{1}-{2}.png";        const string TileSource = "https://mts{0}.google.com/vt/lyrs=m@207000000&hl=zh-CN&gl=CN&src=app&x={1}&y={2}&z={3}&s={4}";        const string SourceTail = "Galileo";        static Random rng = new Random();        static double Clip(double n, double minValue, double maxValue)        {            return Math.Min(Math.Max(n, minValue), maxValue);        }        static void LatLongToTileXY(double latitude, double longitude, int levelOfDetail, out int tileX, out int tileY)        {            double x = (longitude + 180) / 360;            double sinLatitude = Math.Sin(latitude * Math.PI / 180);            double y = 0.5 - Math.Log((1 + sinLatitude) / (1 - sinLatitude)) / (4 * Math.PI);            uint mapSize = 1u << levelOfDetail;            tileX = (int)Clip(x * mapSize + 0.5, 0, mapSize - 1);            tileY = (int)Clip(y * mapSize + 0.5, 0, mapSize - 1);        }        static bool Validate(int x, int y, int l)        {            bool ret = false;            try            {                Bitmap bmp = new Bitmap(string.Format(NameFormat, x, y, l));                ret = (bmp.Height == 256 && bmp.Width == 256);                bmp.Dispose();            }            catch (Exception) { }            return ret;        }        static void Download(int x, int y, int l)        {            try            {                WebClient client = new WebClient();                client.Headers.Add("user-agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:21.0) Gecko/20130109 Firefox/21.0");                string loc = string.Format(TileSource, rng.Next(4), x, y, l,                    SourceTail.Substring(0, rng.Next(SourceTail.Length)));                string name = string.Format(NameFormat, x, y, l);                client.DownloadFile(loc, name);            }            catch (Exception ex)            {                Console.WriteLine();                Console.WriteLine(ex.Message);            }        }        static void Main(string[] args)        {            try            {                Console.WriteLine("Google Map Tiles Downloader");                Console.WriteLine("lat1, long1   lat2, long2   level");                double[] array = new double[4];                int level = 1, i = 0;                string[] splits = Console.ReadLine().Split(' ', ',');                foreach (string s in splits)                {                    if (s.Trim() == "")                        continue;                    if (i < 4) array[i++] = double.Parse(s);                    else level = int.Parse(s);                }                double lat1 = Clip(array[0], MinLatitude, MaxLatitude);                double lat2 = Clip(array[2], MinLatitude, MaxLatitude);                double long1 = Clip(array[1], MinLongitude, MaxLongitude);                double long2 = Clip(array[3], MinLongitude, MaxLongitude);                if (level < 1) level = 1;                if (level > 19) level = 19;                Console.WriteLine("Generating download list...");                List<int> list = new List<int>();                for (i = 1; i <= level; ++i)                {                    int x1, y1, x2, y2;                    LatLongToTileXY(lat1, long1, i, out x1, out y1);                    LatLongToTileXY(lat2, long2, i, out x2, out y2);                    for (int u = x1; u <= x2; ++u)                        for (int v = y1; v <= y2; ++v)                        {                            list.Add(u);                            list.Add(v);                            list.Add(i);                        }                }                Console.WriteLine(list.Count / 3 + " in list");                Console.WriteLine("Validating existing tiles...");                List<int> dlist = new List<int>();                for (i = 0; i < list.Count; i += 3)                {                    int x = list[i], y = list[i + 1], l = list[i + 2];                    if (Validate(x, y, l))                        continue;                    dlist.Add(x);                    dlist.Add(y);                    dlist.Add(l);                }                Console.WriteLine(dlist.Count / 3 + " to download");                if (dlist.Count == 0)                    return;                Console.WriteLine("Press ENTER");                Console.ReadLine();                for (i = 0; i < dlist.Count; i += 3)                {                    int x = dlist[i], y = dlist[i + 1], l = dlist[i + 2];                    Console.Write("\rDownloading " + i / 3);                    Download(x, y, l);                }                Console.WriteLine();                Console.WriteLine("Done.");            }            catch (Exception ex)            {                Console.WriteLine();                Console.WriteLine(ex.Message);                Console.WriteLine(ex.Source);                Console.WriteLine(ex.StackTrace);                Console.WriteLine();            }        }    }}