This project forked from zhanggangbz/mapdownload
谷歌地图瓦片数据下载工具
License: GNU General Public License v3.0
谷歌地图瓦片数据下载工具
由于一些原因，需要下载一个地图的瓦片数据，网上有很多地图下载工具，但是功能都比较复杂强大，下载地图数据时如果范围过大，经常会在下载途中出现各种问题，要么内存爆了，要么崩溃了
找工具确实花费了不少的时间，最后还不如自己写一个，功能极其简单，只是单独下载瓦片数据而已（只实现了谷歌卫星地图瓦片数据下载，为了能和dem高程数据对上，下的是无偏移的数据）
通过经纬度信息计算tile索引的方法参考自：
瓦片数据体量灰常大，下载之前自己计算准备好足够的磁盘空间，同时也得考虑大量文件个数到时候删除会很头疼的
谷歌地图最大19级，部分区域18级
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