Hello,
I am playing around with the experimental discrete isolation features of
Osm2pgsql. Following the documentation in
https://osm2pgsql.org/doc/manual.html#strategy-discrete-isolation and the
blogpost
https://blog.jochentopf.com/2022-12-19-selecting-settlements-to-display.html.
The goal is similar to the blog post, to improve the rendering of worldwide
train stations on the map, using a calculated measure of importance stored in a
database column. Some work in progress is in
https://github.com/hiddewie/OpenRailwayMap-vector/pull/633.
In the original blog post is the sentence
> For the map above I used the formula "discr_iso_rank < (3.5 ^ @zoom_level) *
> 10 and importance_rank < (10 ^ @zoom_level)" to decide which places to show
> and which not to show. Of course, that’s only an example and it has to be
> tuned for different types of maps etc.
I would like to understand the exact meaning of the three columns `discr_iso`,
`irank` and `dirank` better, in order to tune the values in the SQL queries.
Can you elaborate on the exact meaning of the columns, the (expected) value
ranges, and what high and low values mean, and how to interpret the values in
the columns together?
Thanks in advance.
--
Reply to this email directly or view it on GitHub:
https://github.com/osm2pgsql-dev/osm2pgsql/discussions/2422
You are receiving this because you are subscribed to this thread.
Message ID: <osm2pgsql-dev/osm2pgsql/repo-discussions/[email protected]>
_______________________________________________
Tile-serving mailing list
[email protected]
https://lists.openstreetmap.org/listinfo/tile-serving
