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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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30Aug/114

中国地图偏移校正算法

该校正适用于 Google map China, Microsoft map china ,MapABC 等,因为这些地图构成方法是一样的。

需要offset.dat文件,该文件为0.01精度校正数据, 有需要者请联系作者, 报价: 5,000.00 RMB。

php算法

<?php
/*
   代码功能:利用0.01精度校正库文件修正中国地图经纬度偏移。
*/
header("Content-Type:text/html; charset=utf-8");
define('__dat_db__' , 'offset.dat' );// DAT数据文件
define('datmax' , 9813675 );// 数据条数-结束记录

// # offset.php?lat=39.914914&lon=116.460633
$lon=$_GET['lon'];
$lat=$_GET['lat'];
$tmplon=intval($lon * 100);
$tmplat=intval($lat * 100);
//经度到像素X值
function lngToPixel($lng,$zoom) {
return ($lng+180)*(256<<$zoom)/360;
}
//像素X到经度
function pixelToLng($pixelX,$zoom){
return $pixelX*360/(256<<$zoom)-180;
}
//纬度到像素Y
function latToPixel($lat, $zoom) {
$siny = sin($lat * pi() / 180);
$y=log((1+$siny)/(1-$siny));
return (128<<$zoom)*(1-$y/(2*pi()));
}
//像素Y到纬度
function pixelToLat($pixelY, $zoom) {
$y = 2*pi()*(1-$pixelY /(128 << $zoom));
$z = pow(M_E, $y);
$siny = ($z -1)/($z +1);
return asin($siny) * 180/pi();
}

function xy_fk( $number ){
        $fp = fopen(__dat_db__,"rb"); //■1■.将 r 改为 rb
        $myxy=$number;//#"112262582";
        $left = 0;//开始记录
        $right = datmax;//结束记录

        //采用用二分法来查找查数据
        while($left <= $right){
            $recordCount =(floor(($left+$right)/2))*8; //取半
            //echo "运算:left=".$left." right=".$right." midde=".$recordCount."<br />";
            @fseek ( $fp, $recordCount , SEEK_SET ); //设置游标
            $c = fread($fp,8); //读8字节
            $lon = unpack('s',substr($c,0,2));
            $lat = unpack('s',substr($c,2,2));
            $x = unpack('s',substr($c,4,2));
            $y = unpack('s',substr($c,6,2));
            $jwd=$lon[1].$lat[1];
            //echo "找到的经纬度:".$jwd;
            if ($jwd==$myxy){
               fclose($fp);
               return $x[1]."|".$y[1];
               break;
            }else if($jwd<$myxy){
               //echo " > ".$myxy."<br />";
               $left=($recordCount/8) +1;
            }else if($jwd>$myxy){
               //echo " < ".$myxy."<br />";
               $right=($recordCount/8) -1;
            }

        }
        fclose($fp);
}

$offset =xy_fk($tmplon.$tmplat);
$off=explode('|',$offset);
$lngPixel=lngToPixel($lon,18)+$off[0];
$latPixel=latToPixel($lat,18)+$off[1];

echo pixelToLat($latPixel,18).",".pixelToLng($lngPixel,18);

?>

c#算法

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;   

namespace MapDigit.GIS
{
    public class GeoLatLng
    {   

        public GeoLatLng(double latitude, double longitude)
        {
            this.latitude = latitude;
            this.longitude = longitude;
        }
        public double latitude;
        public double longitude;
    }   

    public class GeoPoint
    {
        public GeoPoint(int x, int y)
        {
            this.x = x;
            this.y = y;
        }
        public int x;
        public int y;
    }   

    public class OffsetInChina
    {
        //用于从GPS坐标转换为偏移后坐标
        public static GeoLatLng fromEarthToMars(GeoLatLng earth)
        {
            GeoPoint ptOffset = getOffset(earth.latitude, earth.longitude);
            if (ptOffset.x != 0 || ptOffset.y != 0)
            {
                int pixelX, pixelY;
                TileSystem.LatLongToPixelXY(earth.latitude, earth.longitude, 18, out pixelX, out pixelY);
                GeoPoint pt = new GeoPoint(pixelX, pixelY);
                pt.x += ptOffset.x;
                pt.y += ptOffset.y;
                double latitude, longitude;
                TileSystem.PixelXYToLatLong(pt.x, pt.y, 18, out latitude, out longitude);
                return new GeoLatLng(latitude, longitude);   

            }
            else
            {
                return new GeoLatLng(earth.latitude, earth.longitude);
            }   

        }   

        //用于将偏移后坐标转成真实的坐标
        public static GeoLatLng fromMarToEarth(GeoLatLng mars)
        {
            GeoPoint ptOffset = getOffset(mars.latitude, mars.longitude);
            if (ptOffset.x != 0 || ptOffset.y != 0)
            {
                int pixelX, pixelY;
                TileSystem.LatLongToPixelXY(mars.latitude, mars.longitude, 18, out pixelX, out pixelY);
                GeoPoint pt = new GeoPoint(pixelX, pixelY);
                pt.x -= ptOffset.x;
                pt.y -= ptOffset.y;
                double latitude, longitude;
                TileSystem.PixelXYToLatLong(pt.x, pt.y, 18, out latitude, out longitude);
                return new GeoLatLng(latitude, longitude);   

            }
            else
            {
                return new GeoLatLng(mars.latitude, mars.longitude);
            }
        }   

        //这个函数用于将需要查询的经纬度转成最近的0.01分度值,无插值
        //也可以自行实现插值
        private static GeoPoint getQueryLocation(double latitude, double longitude)
        {
            int lat = (int)(latitude * 100);
            int lng = (int)(longitude * 100);
            double lat1 = ((int)(latitude * 1000 + 0.499999)) / 10.0;
            double lng1 = ((int)(longitude * 1000 + 0.499999)) / 10.0;
            for (double x = longitude; x < longitude + 1; x += 0.5)
            {
                for (double y = latitude; x < latitude + 1; y += 0.5)
                {
                    if (x <= lng1 && lng1 < (x + 0.5) && lat1 >= y && lat1 < (y + 0.5))
                    {
                        return new GeoPoint((int)(x + 0.5), (int)(y + 0.5));
                    }
                }
            }
            return new GeoPoint(lng, lat);
        }   

        private static GeoPoint getOffset(double longitude, double latitude)
        {
            //这个函数用于返回查询结果,就是从校正数据中返回18级时x,y方偏移
            //可以自行实现
            return null;
        }   

    }
}
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11Aug/110

Objective-C中对Url的参数进行编码

1、对于中文和一些非url的字符串,可以使用stringByAddingPercentEscapesUsingEncoding:

NSString* escapedUrlString =
   [unescapedString stringByAddingPercentEscapesUsingEncoding:
                        NSASCIIStringEncoding];

2、对于url格式的参数,上面方法不行,可以使用下面的方法解决这个问题:

  NSString * encodedString = (NSString *)CFURLCreateStringByAddingPercentEscapes
(    NULL,    (CFStringRef)unencodedString,    NULL,
    (CFStringRef)@"!*'();:@&=+$,/?%#[]",    kCFStringEncodingUTF8 );
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