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

[Lime, Steve D (MNIT)]

Beautiful maps!

From: Edward Mac Gillavry [mailto:emacgillavry at hotmail.com]
Sent: Tuesday, September 18, 2018 4:58 PM
To: Lime, Steve D (MNIT) <steve.lime at state.mn.us>; Basques, Bob (CI-StPaul) <bob.basques at ci.stpaul.mn.us>; mapserver-users at lists.osgeo.org
Subject: 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<mailto:mapserver-users-bounces at lists.osgeo.org>> on behalf of Lime, Steve D (MNIT) <steve.lime at state.mn.us<mailto: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<mailto: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<mailto: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






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