Sorry everyone, pressed "send" too early! On Fri, Mar 8, 2024 at 9:55 AM chris hermansen <clherman...@gmail.com> wrote:
> Sylvain and list, > > On Fri, Mar 8, 2024 at 8:15 AM Sylvain Ard via QGIS-User < > qgis-user@lists.osgeo.org> wrote: > >> >> Good morning, >> I have a PostgreSQL database of several million points with >> latitude/longitude and I would like to do the following with qgis-server or >> PostGis: >> according to a number of shapes (hexagons, circles or squares) per mesh, >> calculate the number of points per shape and color the shape darker as >> there are points underneath. If there are no points the shape should not >> appear. If we zoom in, the meshes must be recalculated and reduced of >> course. On the other hand I would like a leaflet basemap. >> > > I don't have a "follow this recipe" answer for you, but I wonder if you > have looked at "heat maps" as a general concept and thought about how that > might apply to your needs. > > For example, there is this interesting discussion on StackExchange about > density of bomb craters: > > https://gis.stackexchange.com/questions/385338/point-density-map-in-qgis > > Also worth learning about is how QGIS handles point clouds and whether that might apply to solving your problem https://docs.qgis.org/3.34/en/docs/user_manual/working_with_point_clouds/point_clouds.html -- Chris Hermansen · clhermansen "at" gmail "dot" com C'est ma façon de parler.
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