[mapserver-users] Ideas about how to render over/under roadways/bridges in maps?

[Sven Schroeter]

wow, really cool project and interesting configuration, thanks for sharing!
Sven

Von: mapserver-users [mailto:mapserver-users-bounces at lists.osgeo.org] Im
Auftrag von Edward Mac Gillavry
Gesendet: Dienstag, 18. September 2018 23:58
An: Lime, Steve D (MNIT); Basques, Bob (CI-StPaul);
mapserver-users at lists.osgeo.org
Betreff: Re: [mapserver-users] Ideas about how to render over/under
roadways/bridges in maps?


Check out our MAP files for the City of Amsterdam reference map at 
https://github.com/Amsterdam/mapserver/blob/develop/kbk50.map for the 1:50K
map. The GROUP "lijnen" is the one you are looking for: it renders all
casing from streets to regional thoroughfares, followed by the fills for the
same lines. We then render all railroads and then the highways come last:
again, we render the casings for all lines and then we finish with the fills
in its own layer. This dataset doesn't contain an attribute for z-ordering
unfortunately. 

For the 1:5K and larger, there is the
https://github.com/Amsterdam/mapserver/blob/develop/bgt.map MAP file that
does have an attribute for z-ordering that we use to create views per
z-level, e.g. "bgt.wegdeel_vlak0" for z-level 0.

Results can at https://data.amsterdam.nl/. Hope these MAP files give you
some ideas how to go about rendering transportation networks.

Best,

Edward
________________________________________
From: mapserver-users <mapserver-users-bounces at lists.osgeo.org> on behalf of
Lime, Steve D (MNIT) <steve.lime at state.mn.us>
Sent: Tuesday, September 18, 2018 11:03:55 PM
To: Basques, Bob (CI-StPaul); mapserver-users at lists.osgeo.org
Subject: Re: [mapserver-users] Ideas about how to render over/under
roadways/bridges in maps? 
 
Most of the battle is identifying the over/under in the data. Have you got
that figured out?  I’d think it would be a matter of sorting: under, neither
under or over and then over. Probably with no line caps.
 
From: mapserver-users [mailto:mapserver-users-bounces at lists.osgeo.org] On
Behalf Of Basques, Bob (CI-StPaul)
Sent: Tuesday, September 18, 2018 11:14 AM
To: mapserver-users at lists.osgeo.org
Subject: [mapserver-users] Ideas about how to render over/under
roadways/bridges in maps?
 
All, 
 
I’m looking for general techniques in how to best manage rendering of
over/under roadway and rail road bridges, etc.
 
My first thought was to use some sort of special overlay layer to handle
this.  But maybe a database appraoch might be better.  I also start to fall
into the problem of having a lot of transporation related layers,   Streets
and Railroads obviously, but the not the so obvious are Alleys, Sidewalks,
Park Trails/Paths, Bike Routes, tunnels, etc.  
 
How to make these all stack nicely.  I generally maintain these things all
in thier own grouping right now as separate datasets.  They originate from
separate authors and are maintained that way too.  Which is why I was
thinking that a DB approach might be the best to make the Z-indexing work.
 
Thoughts?
 
Thanks
 
bobb
 
 
 
"Reality is merely an illusion, albeit a very persistent one."
- Albert Einstein