Google Map Hack - 版本历史

Comcat：/* Google Map Tile 下载 */

2014-04-24T07:03:24Z

‎Google Map Tile 下载

Comcat：/* 概述 */

2013-04-08T11:44:06Z

‎概述

Comcat：/* 概述 */

2013-04-08T11:43:05Z

‎概述

Comcat：/* 概述 */

2013-04-08T11:42:07Z

‎概述

2013年4月8日 (一) 11:40 Comcat

2013-04-08T11:40:13Z

Comcat：/* World File Format */

2013-04-02T08:34:11Z

‎World File Format

2013年4月2日 (二) 08:29 Comcat

2013-04-02T08:29:43Z

2013年4月2日 (二) 08:28 Comcat

2013-04-02T08:28:41Z

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 Subject 	World File Format  Author 	A.J. Romanelli  Date 	Apr 10, 2006  Message 	The units of a world file are map units. For example, if the x/y values you en...”为内容创建页面

2013-04-02T07:48:20Z

以“<pre> Subject World File Format Author A.J. Romanelli Date Apr 10, 2006 Message The units of a world file are map units. For example, if the x/y values you en...”为内容创建页面

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<pre>
Subject World File Format
Author A.J. Romanelli
Date Apr 10, 2006
Message The units of a world file are map units. For example, if the x/y values you enter are state-plane coordinates in feet, then your image will be referenced to state-plane feet, if the values you enter are utm meters, then your image will be referenced to that UTM zone. The values for the offsets and cell size need to be specified in the same units (e.g. if you are in state-plane use feet, if you are working in UTM use meters).

From the MO help....

Vector data in MapLayers exists in a real-world or map coordinate system, measured, typically, in feet or meters. The x-coordinates increase from left to right and the y-coordinates increase from the bottom to the top. This is quite different from a raster image represented by an ImageLayer. A raster image is organized and measured by rows and columns. Each cell has a row number and a column number. If the origin is located in the upper left corner of the data, that cell would be identified as row 1, column 1.

For MapLayers and ImageLayers to be displayed simultaneously, the rows and columns of the image must be mapped into the x,y plane of a map coordinate system. An image-to-world transformation that converts the image coordinates to map coordinates must be established. Some image formats store georeferencing information in the file header of the image or, in the case of images that do not contain this georeferencing information, facilities exist in other products available from ESRI, for creating a file that contains the necessary transformation parameters. The file that contains the transformation parameters is called a world file. The world file takes precedence over any header information.

About the world file

The image-to-world transformation is a six parameter affine transformation of the form:

x' = Ax + By + C
y' = Dx + Ey + F

where

x' = calculated x-coordinate of the pixel on the map
y' = calculated y-coordinate of the pixel on the map
x = column number of a pixel in the image
y = row number of a pixel in the image
A = x-scale, dimension of a pixel in map units in the x-direction
D,B = rotation terms. Note: Not supported for this release.
E = y-scale (this value is always negative, because image space is top-down, whereas map space is bottom-up)
C = translation term; x-Origin (x-coordinate of the center of the upper left pixel)
F = translation term; y-Origin (y-coordinate of the center of the upper left pixel)
The transformation parameters are stored in the world file, an ASCII format, in this order, A, D, B, E, C, F; for example:

2.22123393184959 A
0.00000000000000 D
0.00000000000000 B
-2.22123393184959 E
10383.13600759092515 C
11611.48117990907485 F
Note that the parameter characters are included in the example for clarity. They do not actually appear in the file.
If a world file is not present and there is no georeferencing information in the header of the image, a default mapping is still provided between image space and map space. MapObjects makes the origin of the image (-0.5, -0.5), and sets the X and Y scale factors both to 1.0 (as the center of the bottom right pixel should be at (0,0).
If you want to display a non-georeferenced image on a portion of your map, supply the georeferencing world file yourself, and make sure it maps the image to the portion of the map that you want.

World file naming conventions

The world file associated with an image is named by following the conventions in the table below. For example, if you have an image that's stored in a file named myimage.bmp, then the world file associated with it must be named myimage.bmpw or myimage.bpw.

If the file extension of the image is the world file extension must be
bmp bmpw or bpw
jpg; jpeg jpgw or jgw
tif; tff; tiff tfw
gis gsw
lan lnw
bil blw
bip bpw
bsq bqw
sid sdw
sun snw
rs; ras rsw
rlc rcw
</pre>

←上一版本		2014年4月24日 (四) 07:03的版本
第51行：		第51行：

	== Google Map Tile 下载 ==		== Google Map Tile 下载 ==
		+
		+	坐标到Tile的计算参考：http://www.maptiler.org/google-maps-coordinates-tile-bounds-projection/

	<pre>		<pre>

←上一版本		2013年4月8日 (一) 11:44的版本
第9行：		第9行：
	纵坐标从上到下像素为 0 - 256*2^18（2的18次幂）。显示+85到-85度的范围，纬度越小，y 越大		纵坐标从上到下像素为 0 - 256*2^18（2的18次幂）。显示+85到-85度的范围，纬度越小，y 越大

−	~~经度到像素 X 值： (long + 180) * (256L << zoom) / 360~~

−	像素 X 到经度： X * 360 / (256L << zoom) - 180	+	经度到像素 X 值：
		+
		+	(long + 180) * (256L << zoom) / 360
		+
		+	像素 X 到经度：
		+
		+	X * 360 / (256L << zoom) - 180

@@ 第7行： / 第7行： @@
 假设 zoom = 18，则横坐标从左至右像素为 0 - 256*2^18（2的18次幂），也就是每增加一级，地图大小横纵坐标加倍，256为一个标准图片的大小。显示-180度到+180的范围，经度越大，x 越大
-纵坐标从上到下像素为 0 - 2 56*2^18（2的18次幂）。显示+85到-85度的范围，纬度越小，y 越大
+纵坐标从上到下像素为 0 - 256*2^18（2的18次幂）。显示+85到-85度的范围，纬度越小，y 越大
 经度到像素 X 值： (long + 180) * (256L << zoom) / 360

@@ 第5行： / 第5行： @@
 Google 的地图采用将地球圆表面投影成平面的方式进行贴图
-假设 zoom=15，则横坐标从左至右像素为 0 - 256*2^15（2的15次幂），也就是每增加一级，地图大小横纵坐标加倍，256为一个标准图片的大小。显示-180度到+180的范围，经度越大，x 越大
+假设 zoom = 18，则横坐标从左至右像素为 0 - 256*2^18（2的18次幂），也就是每增加一级，地图大小横纵坐标加倍，256为一个标准图片的大小。显示-180度到+180的范围，经度越大，x 越大
-纵坐标从上到下像素为 0 -2 56*2^15（2的15次幂），显示+85到-85度的范围，纬度越小，y 越大
+纵坐标从上到下像素为 0 - 2 56*2^18（2的18次幂）。显示+85到-85度的范围，纬度越小，y 越大
 经度到像素 X 值： (long + 180) * (256L << zoom) / 360

←上一版本		2013年4月8日 (一) 11:40的版本
第1行：		第1行：
	注意：以下资料皆来自网络，未经验证		注意：以下资料皆来自网络，未经验证
		+
		+	== 概述 ==
		+
		+	Google 的地图采用将地球圆表面投影成平面的方式进行贴图
		+
		+	假设 zoom=15，则横坐标从左至右像素为 0 - 256*2^15（2的15次幂），也就是每增加一级，地图大小横纵坐标加倍，256为一个标准图片的大小。显示-180度到+180的范围，经度越大，x 越大
		+
		+	纵坐标从上到下像素为 0 -2 56*2^15（2的15次幂），显示+85到-85度的范围，纬度越小，y 越大
		+
		+	经度到像素 X 值： (long + 180) * (256L << zoom) / 360
		+
		+	像素 X 到经度： X * 360 / (256L << zoom) - 180
		+
		+
		+	纬度到像素 Y：
		+
		+	<pre>
		+	double siny = Math.sin(lat * Math.PI / 180);
		+	double y = Math.log((1 + siny) / (1 - siny));
		+	Y = (128 << zoom) * (1 - y / (2 * Math.PI));
		+	</pre>
		+
		+	像素Y到纬度：
		+
		+	<pre>
		+	double y = 2 * Math.PI * (1 - Y / (128 << zoom));
		+	double z = Math.pow(Math.E, y);
		+	double siny = (z - 1) / (z + 1);
		+	Lat = Math.asin(siny) * 180 / Math.PI;
		+	</pre>
		+
		+	<br><br>
		+
		+	== 矫正 ==
		+
		+	http://wenku.baidu.com/view/01b8af8ca0116c175f0e4866.html
		+
		+	http://wenku.baidu.com/view/d27fd5bc1a37f111f1855b1c.html
		+
		+	http://wenku.baidu.com/view/808cbcd549649b6648d7470b.html
		+
		+	http://blog.sina.com.cn/s/blog_538036cf0100pxbl.html
		+
		+	<br><br>

	== Google Map Tile 下载 ==		== Google Map Tile 下载 ==

←上一版本		2013年4月2日 (二) 08:34的版本
第212行：		第212行：

	== World File Format ==		== World File Format ==
		+
		+	http://en.wikipedia.org/wiki/World_file

	<pre>		<pre>

←上一版本		2013年4月2日 (二) 08:29的版本
第1行：		第1行：
		+	注意：以下资料皆来自网络，未经验证
		+
	== Google Map Tile 下载 ==		== Google Map Tile 下载 ==