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26Sep/110

Fetching tiles for Offline Map

BE WARE: If you are trying to cache the tiles that Google serves, that may be a violation of Google's Terms of Service.
Google Maps API Premier License Agreement

3.4 Cache Restrictions. Customer may not pre-fetch, retrieve, cache, index, or store any Content, or portion of the Services with the exception being Customer may store limited amounts of Content solely to improve the performance of the Customer Implementation due to network latency, and only if Customer does so temporarily, securely, and in a manner that (a) does not permit use of the Content outside of the Services; (b) is session-based only (once the browser is closed, any additional storage is prohibited); (c) does not manipulate or aggregate any Content or portion of the Services; (d) does not prevent Google from accurately tracking Page Views; and (e) does not modify or adjust attribution in any way.

using System.Collections.Generic;
using System.Text;
namespace MapTileURL
{
    class Program
    {
        private static Dictionary<string, string> MapTypeURLs = new Dictionary<string, string>
        {
            { "GoogleSatURL", "<a href="http://khm{GOOG_DIGIT}.google.com/kh/v=58&x={X}&y={Y}&z={ZOOM}&s={GALILEO">http://khm{GOOG_DIGIT}.google.com/kh/v=58&x={X}&y={Y}&z={ZOOM}&s={GALILEO</a>}" },
            { "GoogleMapURL", "<a href="http://mt{GOOG_DIGIT}.google.com/vt/lyrs=m@121&hl=en&x={X}&y={Y}&z={ZOOM}&s={GALILEO">http://mt{GOOG_DIGIT}.google.com/vt/lyrs=m@121&hl=en&x={X}&y={Y}&z={ZOOM}&s={GALILEO</a>}" },
            { "GoogleHybURL", "<a href="http://mt{GOOG_DIGIT}.google.com/vt/lyrs=h@121&hl=en&x={X}&y={Y}&z={ZOOM}&s={GALILEO">http://mt{GOOG_DIGIT}.google.com/vt/lyrs=h@121&hl=en&x={X}&y={Y}&z={ZOOM}&s={GALILEO</a>}" },
            { "GoogleTerURL", "<a href="http://mt{GOOG_DIGIT}.google.com/vt/lyrs=t@108,r@121&hl=en&x={X}&y={Y}&z={ZOOM}&s={GALILEO">http://mt{GOOG_DIGIT}.google.com/vt/lyrs=t@108,r@121&hl=en&x={X}&y={Y}&z={ZOOM}&s={GALILEO</a>}" },
            { "GoogleChinaURL", "<a href="http://mt{GOOG_DIGIT}.google.cn/vt/lyrs=m@121&hl=en&gl=cn&x={X}&y={Y}&z={ZOOM}&s={GALILEO">http://mt{GOOG_DIGIT}.google.cn/vt/lyrs=m@121&hl=en&gl=cn&x={X}&y={Y}&z={ZOOM}&s={GALILEO</a>}" },
            { "YahooMapURL", "<a href="http://maps{Y_DIGIT}.yimg.com/hx/tl?v=4.3&.intl=en&x={X}&y={YAHOO_Y}&z={YAHOO_ZOOM}&r=1">http://maps{Y_DIGIT}.yimg.com/hx/tl?v=4.3&.intl=en&x={X}&y={YAHOO_Y}&z={YAHOO_ZOOM}&r=1</a>" },
            { "YahooSatURL", "<a href="http://maps{Y_DIGIT}.yimg.com/ae/ximg?v=1.9&t=a&s=256&.intl=en&x={X}&y={YAHOO_Y}&z={YAHOO_ZOOM}&r=1">http://maps{Y_DIGIT}.yimg.com/ae/ximg?v=1.9&t=a&s=256&.intl=en&x={X}&y={YAHOO_Y}&z={YAHOO_ZOOM}&r=1</a>" },
            { "YahooInMapURL", "<a href="http://maps.yimg.com/hw/tile?locale=en&imgtype=png&yimgv=1.2&v=4.1&x={X}&y={YAHOO_Y}&z={YAHOO_ZOOM_2">http://maps.yimg.com/hw/tile?locale=en&imgtype=png&yimgv=1.2&v=4.1&x={X}&y={YAHOO_Y}&z={YAHOO_ZOOM_2</a>}" },
            { "YahooInHybURL", "<a href="http://maps.yimg.com/hw/tile?imgtype=png&yimgv=0.95&t=h&x={X}&y={YAHOO_Y}&z={YAHOO_ZOOM_2">http://maps.yimg.com/hw/tile?imgtype=png&yimgv=0.95&t=h&x={X}&y={YAHOO_Y}&z={YAHOO_ZOOM_2</a>}" },
            { "YahooHybURL", "<a href="http://maps{Y_DIGIT}.yimg.com/hx/tl?v=4.3&t=h&.intl=en&x={X}&y={YAHOO_Y}&z={YAHOO_ZOOM}&r=1">http://maps{Y_DIGIT}.yimg.com/hx/tl?v=4.3&t=h&.intl=en&x={X}&y={YAHOO_Y}&z={YAHOO_ZOOM}&r=1</a>" },
            { "MicrosoftBrMapURL", "<a href="http://imakm{MS_DIGITBR}.maplink3.com.br/maps.ashx?v={QUAD}|t&call=2.2.4">http://imakm{MS_DIGITBR}.maplink3.com.br/maps.ashx?v={QUAD}|t&call=2.2.4</a>" },
            { "MicrosoftHybURL", "<a href="http://ecn.t{MS_DIGIT}.tiles.virtualearth.net/tiles/h{QUAD}.png?g=441&mkt=en-us&n=z">http://ecn.t{MS_DIGIT}.tiles.virtualearth.net/tiles/h{QUAD}.png?g=441&mkt=en-us&n=z</a>" },
            { "MicrosoftSatURL", "<a href="http://ecn.t{MS_DIGIT}.tiles.virtualearth.net/tiles/a{QUAD}.png?g=441&mkt=en-us&n=z">http://ecn.t{MS_DIGIT}.tiles.virtualearth.net/tiles/a{QUAD}.png?g=441&mkt=en-us&n=z</a>" },
            { "MicrosoftMapURL", "<a href="http://ecn.t{MS_DIGIT}.tiles.virtualearth.net/tiles/r{QUAD}.png?g=441&mkt=en-us&n=z">http://ecn.t{MS_DIGIT}.tiles.virtualearth.net/tiles/r{QUAD}.png?g=441&mkt=en-us&n=z</a>" },
            { "MicrosoftTerURL", "<a href="http://ecn.t{MS_DIGIT}.tiles.virtualearth.net/tiles/r{QUAD}.png?g=441&mkt=en-us&shading=hill&n=z">http://ecn.t{MS_DIGIT}.tiles.virtualearth.net/tiles/r{QUAD}.png?g=441&mkt=en-us&shading=hill&n=z</a>" },
            { "OpenStreetMapURL", "<a href="http://tile.openstreetmap.org/{ZOOM}/{X}/{Y}.png">http://tile.openstreetmap.org/{ZOOM}/{X}/{Y}.png</a>" },
            { "OSMARenderURL", "<a href="http://tah.openstreetmap.org/Tiles/tile/{ZOOM}/{X}/{Y}.png">http://tah.openstreetmap.org/Tiles/tile/{ZOOM}/{X}/{Y}.png</a>" },
            { "OpenAerialMapURL", "<a href="http://tile.openaerialmap.org/tiles/?v=mgm&layer=openaerialmap-900913&x={X}&y={Y}&zoom={OAM_ZOOM">http://tile.openaerialmap.org/tiles/?v=mgm&layer=openaerialmap-900913&x={X}&y={Y}&zoom={OAM_ZOOM</a>}" },
            { "OpenCycleMapURL", "<a href="http://andy.sandbox.cloudmade.com/tiles/cycle/{ZOOM}/{X}/{Y}.png">http://andy.sandbox.cloudmade.com/tiles/cycle/{ZOOM}/{X}/{Y}.png</a>" }
        };
        readonly static char[] Lookup = new[] { 'q', 't', 'r', 's' };
        public static string GetQuadtreeFromXYZoom(int x, int y, int zoom)
        {
            var quad = new StringBuilder();
            for (int i = 0; i < zoom; i++)
            {
                int rx = x % 2;
                int ry = y % 2;
                x /= 2;
                y /= 2;
                quad.Insert(0, Lookup[rx * 2 + ry]);
            }
            quad.Insert(0, 't');
            return quad.ToString();
        }
        public static string BuildUrl(string tileType, int x,int y,int zoom)
        {

            string url = "";
            // Edited by Shustrik - compacted the switch statement
            switch (tileType)
            {
                case "GoogleSat":
                case "GoogleSatH":
                    url = MapTypeURLs["GoogleSatURL"];
                    break;
                case "GoogleMap":
                    url = MapTypeURLs["GoogleMapURL"];
                    break;
                case "GoogleHyb":
                    url = MapTypeURLs["GoogleHybURL"];
                    break;
                case "GoogleTer":
                    url = MapTypeURLs["GoogleTerURL"];
                    break;
                case "GoogleChina":
                    url = MapTypeURLs["GoogleChinaURL"];
                    break;
                case "MicrosoftMap":
                    url = MapTypeURLs["MicrosoftMapURL"];
                    break;
                case "MicrosoftSat":
                    url = MapTypeURLs["MicrosoftSatURL"];
                    break;
                case "MicrosoftHyb":
                    url = MapTypeURLs["MicrosoftHybURL"];
                    break;
                case "MicrosoftTer":
                    url = MapTypeURLs["MicrosoftTerURL"];
                    break;
                case "MicrosoftBrMap":
                    if (zoom <= 10)
                        url =  MapTypeURLs["MicrosoftMapURL"];
                    else
                        url = MapTypeURLs["MicrosoftBrMapURL"];
                    break;
                case "YahooMap":
                    url = MapTypeURLs["YahooMapURL"];
                    break;
                case "YahooSat":
                case "YahooSatH":
                case "YahooSatH2":
                    url = MapTypeURLs["YahooSatURL"];
                    break;
                case "YahooHyb":
                    url = MapTypeURLs["YahooHybURL"];
                    break;
                case "YahooInMap":
                    url = MapTypeURLs["YahooInMapURL"];
                    break;
                case "YahooInHyb":
                    url = MapTypeURLs["YahooInHybURL"];
                    break;
                case "OpenStreetMap":
                    url = MapTypeURLs["OpenStreetMapURL"];
                    break;
                case "OSMARender":
                    url = MapTypeURLs["OSMARenderURL"];
                    break;
                case "OpenAerialMap":
                    url = MapTypeURLs["OpenAerialMapURL"];
                    break;
                case "OpenCycleMap":
                    url = MapTypeURLs["OpenCycleMapURL"];
                    break;
            }

            // Edited by Shustrik - added variables for configuration settings other than Google
            string quadcode = "";
            for (int i = (int)zoom - 1; i >= 0; i--)
                quadcode = quadcode + (((((y >> i) & 1) << 1) + ((x >> i) & 1)));
            url = url.Replace("{X}", x.ToString());
            url = url.Replace("{Y}", y.ToString());
            url = url.Replace("{Z}", ((int)zoom).ToString());
            url = url.Replace("{ZOOM}", ((int)zoom).ToString());
            url = url.Replace("{QUAD}", quadcode);
            url = url.Replace("{YAHOO_Y}", (((1 << ((int)zoom)) >> 1) - 1 - y).ToString());
            url = url.Replace("{YAHOO_ZOOM}", ((int)zoom + 1).ToString());
            url = url.Replace("{YAHOO_ZOOM_2}", (17 - (int)zoom + 1).ToString());
            url = url.Replace("{OAM_ZOOM}", (17 - (int)zoom).ToString());
            url = url.Replace("{GOOG_DIGIT}", ((x + y) & 3).ToString());
            url = url.Replace("{GOOG_QUAD}", GetQuadtreeFromXYZoom(x, y, zoom));
            url = url.Replace("{MS_DIGITBR}", ((((y & 1) << 1) + (x & 1)) + 1).ToString());
            url = url.Replace("{MS_DIGIT}", ((((y & 3) << 1) + (x & 1))).ToString());
            url = url.Replace("{Y_DIGIT}", ((x + y + zoom) % 3 +1).ToString());
            url = url.Replace("{GALILEO}", "Galileo".Substring(0, ((3 * x + y) & 7)));
            // support old style {} vars
            url = url.Replace("QQQQ", GetQuadtreeFromXYZoom(x,y,zoom));
            url = url.Replace("XXXX", x.ToString());
            url = url.Replace("YYYY", y.ToString());
            url = url.Replace("ZZZZ", (17 - (int)zoom).ToString());
            url = url.Replace("{OSM_ZOOM}", ((int)zoom).ToString());
            url = url.Replace("{MS_QUADCODE}", quadcode);
            url = url.Replace("*", ((x+y+zoom) %4).ToString());
            return url;
        }
        static void Main(string[] args)
        {
            string url = BuildUrl("GoogleMap", 1, 1, 1);
            //return <a href="http://mt2.google.com/vt/lyrs=m@121&hl=en&x=1&y=1&z=1&s=Gali">http://mt2.google.com/vt/lyrs=m@121&hl=en&x=1&y=1&z=1&s=Gali</a>
        }
    }
}
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