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Those who are interested can refer to it. The text provides codes in languages вЂ‹вЂ‹such as python, perl, PHP. The comparison between the two is as follows:Д«TW: If you need more TMS algorithm formulas into executable codes, please refer to OSM's wiki: Slippy map tilenames.

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, And the x and y of TMS are 137, and the tile URLs of the two can access these two links: &y=6696&z=14&s=Galileo and, the latter is the Expo map tile I cut through the maptiler tool (in the last Google Maps API I have provided a download for the v3 offline development kit article.

After calculation, at the 14th level, the x and y of Google tile are 137 respectively. LetвЂ™s use the coordinates of the Shanghai World Expo Performing Arts Center (now the Mercedes-Benz Performing Arts Center) to demonstrate the index difference between Google tile and TMS.

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The result is that all tiles in the column minus y and then minus 1, the formula is no longer listed, you can directly view the source code of the URL analysis provided by me. So: the x-axis in the number index remains unchanged, and the y-axis changes slightly. It should be noted that Google tile is different from TMS because the origin of the Cartesian coordinate system of Google tile is in the upper left corner (that is, the intersection of the north pole and the central meridian), while the origin of TMS is in the lower left corner (the south pole is the same as the central meridian). Experience URL:, you enter After latitude and longitude and selecting the level, you can get the tile index number of Google tile and TMS. You can get the positive and negative between the number and the latitude and longitude online. I found a piece of open source code from the Internet and regrouped it. This should be the basis for the webmap engine to achieve rich and diverse map effects, including more functions such as line, area, and map overlay. The point is in the pixel coordinate position of a certain tile, and there is a pixel relationship between the tile and the bound, so the point can be marked to the bound of the map third, the same as the second, the mouse is stand-alone on the bound, you can get the specific Latitude and longitude information. When marking a point, you can determine according to the longitude and latitude of the point and the longitude and latitude of the tile. When displaying the map, you can determine which map tiles need to be loaded according to the center coordinates and level and the bound range 2. The calculation formula is as follows: n = 2 ^ zoom On the contrary, if the number is known, the unknown latitude and longitude can be calculated. It can be seen from the formula that as long as the latitude, longitude and level are determined, the number index of the tile can be obtained.

The specific calculation formula is as follows: n = 2 ^ zoom

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Numbering these tiles, due to the regularity of tile numbering (plane rectangular coordinate system), plus projection is also an algorithm (the sphere expands into a plane), so an index relationship is established between the number and the coordinates, The latitude and longitude interval can be obtained by the number, and the number of the tile can be found by the latitude and longitude. The number and level relationship are shown in the following table: The number of tiles after cutting is pyramid-shaped with the level. It cuts the projected world map into a quadtree (to be verified) according to levels. For specific standards, please refer to the OGC website. It is a tile map service, also known as WMTS (web map tile service). TMS is the abbreviation of tile map service.

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