st_buffer是PostGIS中的一个函数,用于创建一个几何对象的缓冲区。该函数接受两个参数:geometry和buffer_distance。 geometry表示要创建缓冲区的几何对象,可以是点、线、面等任何几何对象。 buffer_distance表示缓冲区的半径长度,可以是一个固定的数值,也可以是一个表达式,如字段名或计算表达式。 st_buffer函数可以创建...
2 Can't import shapefile to PostGIS 0 PostGIS ST_Buffer a polyline? 6 Optimizing PostGIS ST_Buffer to run in near real time 4 Union/Merge 3D polygons (POLYHEDRALSURFACE Z) each with different heights to output a single polygon in PostGIS 5 PostGIS ST_Buffer with attribute preserv...
3 Remove inner polygons postgis 4 Use ST_Buffer with a conditional distance based on an attribute 4 PostgreSQL/PostGIS Geom to JSON with Inner Join to another table 2 postgis update value from another table that intersects 2 Aggregate polygons from one table in PostGIS by proximity, ...
ArcGIS以其强大的功能与稳定性著称,是当之无愧的GIS界大拿。
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互不相连的LineString为单独的LineString。ST_Buffer(ST_LineMerge(ST_Union(geom)), 0.1, 'join=mitre mitre_limit=5.0'):注意:若不做ST_LineMerge处理,则buffer的拐角处仍为圆角。PostgreSql Buffer函数:http://www.postgis.net/docs/ST_Buffer.html ...
Hi @edzer -- the st_buffer() with singleSide = TRUE works as expected on an example from https://postgis.net/docs/ST_Buffer.html, but differently on actual data. Is this an expected behavior? library(sf) #> Linking to GEOS 3.12.1, GDAL 3...
总结 st_buffer() 函数是 PostGIS 中最常用的分析函数之一,它可以为各种类型的空间几何要素创建缓冲区,并可以通过调整参数来控制缓冲区的绘制方式和平滑程度。在使用 st_buffer() 函数时,应仔细选择半径大小,并考虑适合的圆弧分割数和连接样式,在生成的缓冲区中获得令人满意的平滑效果和连接效果。©...
我不会,至少到现在还不会。我只是相信别人得出的地球半径值。但是,如果古希腊人能算出地球半径,...