This topic provides answers to commonly asked questions about map tiles.

How do I call a map tile in a local area network (LAN)?

You can cache an online tile on your web server and name it in a standard format, for example, [Zoom level]/[Row number]/[Column number].png. Then, you can call the tile by using a URL, for example, http://ip:port/path_to_your_tile_directory/{z}/{x}/{y}.png.

What are the coordinate systems and service standards for map tiles in DataV?

Coordinate systems: DataV supports the WGS 84 and GCJ-02 coordinate systems. Map tiles are projected by using Web Mercator (SRID 3857).

Service standards:
  • Google Maps uses the Tile Map Service (TMS) standard.
  • AMAP accesses a map tile by using a URL, for example, lang=en_us&size=1&scale=1&style=8&x={x}&y={y}&z={z}. In the example URL, {} indicates a placeholder. You must replace a placeholder with the row number or column number of a map tile.

How do I use data in the WGS 84 format in AMAP?

AMAP supports the GC-J02 coordinate system. You must convert the data format from WGS 84 to GC-J02. For more information, see Converting the coordinate system.

How do I cache map tiles?

DataV does not provide services or tools to cache map tiles. You can use a map downloader or write code to cache map tiles.