expression:="id", filter:=intersects(buffer($geometry, 0.05), start_point(geometry(@parent))) ) "end_point"attribute field is the same withend_point(geometry(@parent))instead. I'm just trying to cover PointLayer2 so I get its"id"field value as well. So with lin...
I'm trying to use PostGIS a function in a PyQgis script. My code is: qsql="(select gid, id, St_Buffer(the_geom,200) as geom from archi)" uri = QgsDataSourceURI() uri.setConnection("ip", "port", "x", "x", "x") uri.setDataSource("",qsql, "the_geom","","gid") la...
Counting points on line in QGIS What do you call something that is repeated after every line in a song? Is it possible to balance a top-heavy pointy object like a pyramid or cone on its point only using magnets inside the object and below it? front derailleur cable routing...
Most people think GIS is only about “making maps”. But we harness the power of GIS because of the insights ofspatial analysis. We use spatial analysis through math in maps. Spatial analysis is difficult with paper maps so that’s why we need GIS. Here are examples of spatial analysis: ...
All edges within the buffer are added to a penalty tubes list. (2) The cost (here: travel time) of all network edges from the penalty tubes list is scaled up with the penalty factor pf. (3) A shortest path routing (here: Dijkstra algorithm) is carried out between the start and end...
The buffer is an example of a tool in the analysis tools. When you set a value, it generates a polygon around features at a set distance. Cartography Tools Cartography tools refine data for the production of maps. For example, you can create graticules and grids. You can also generalize ...