问题描述
我是PostGIS的新手，需要在这里寻求帮助.我有一条来自Google地图的多段线(代表一条路线)，需要围绕它建立一个以米或公里为单位的特定距离的多边形(缓冲区).
I am new to PostGIS and need to ask for some help here.I have a polyline from google maps (representing an itinerary) and need to build a polygon (buffer) around it with a specific distance in meters or kilometers.
对于输入，我具有纬度/经度点列表和所需的缓冲距离.
For input, I have the list of Latitude/Longitude points and the required buffer distance.
谁能帮助我建立查询，以便返回的结果是纬度/经度坐标中的多边形，随时可以在地图上绘制?
Can anyone help me build the query so that the returned result is the polygon in Latitude/Longitude coordinates, ready to be plotted on the map ?
推荐答案
经过测试，我发现postgis生成的多边形缓冲区不可靠.也就是说，如果我想在多义线周围留出5公里的缓冲区，则postgis将返回 AT MOST 5公里但在某些时候比这还短的多边形.
After testing, I found that the polygon buffer produced by postgis is unreliable. That is to say, if I want a 5 kilometre buffer around a polyline, postgis will return a polygon which is AT MOST 5 kilometres, yet at some points less than this.
放弃明信片
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