PostGIS作为postgresql针对「地理空间数据」的拓展功能，可以帮助我们有效管理和固化空间矢量数据，以及开展...
PostgreSQL、MySQL这四种数据库的基本特性，包括数据类型、持久化方式、事务支持、分区和分片等特性。
如果您沿着从ST_distance开始的路径遍历PostGIS源代码，则会到达实现上述公式的函数lw_dist2d_pt_pt。
如果您沿着从ST_distance开始的路径遍历PostGIS源代码，则会到达实现上述公式的函数lw_dist2d_pt_pt。
首先，你正在改变每一点，这需要时间 其次，可能更重要的是，你应该将ST_Dwithin与空间索引一起使用...
4.卸载postgis,再重装或者升级 4-1. 配置ld.so.conf [root@VM_0_4_centos opt]# vi /etc/ld.so.conf #编辑内容如下(之前geos是3.6.1,现改成3.7.1) include ld.so.conf.d/*.conf /usr/local/pgsql/lib /usr/local/proj-4.9.3/lib
根据参考信息,ST_Distance_Sphere在较新的PostGIS版本中可能已经被替换或重命名。例如,在PostGIS中,可能需要使用ST_DistanceSphere(注意没有下划线)或ST_Distance函数,具体取决于你的需求和数据库配置。 对于MySQL,如果版本低于5.7.6,可能需要升级数据库或安装额外的地理空间库。 如果函数确实不存在,寻找替代的解决方案...
As a matter of fact i can't say that i will be able to put django 1.4 in production without a proper interaction with postgis... But i'm not that much familiar with what tags should be on what tickets in django's trac, if you think that may not be a suitable tag, i can under...
Description The Elasticsearch _search API supports distance filtering and sorting: Sorting using the _geo_distance sort field Filtering using geo_distance In PostGIS there are two related functions: ST_DWITHIN for filtering by distance S...
I tried handling the pre/post PostGIS 2.2 condition in there as well. It's not the most elegant solution, and it's not easy to test, since the PostGIS version is cached after it's first calculated (so I can't just override_settings). I had to test it by just running the tests ...