Description
Returns a LineString or MultiLineString formed by joining together the line elements of a MultiLineString. Lines are joined at their endpoints at 2-way intersections. Lines are not joined across intersections of 3-way or greater degree.
http://postgis.net/docs/ST_LineMerge.html
https://help.aliyun.com/document_detail/408017.html
标签:intersections,st,html,way,MultiLineString,LineString,linemerge From: https://www.cnblogs.com/2008nmj/p/16881558.html