[mapserver-users] Show traffic on roads.

[Erik H]

Depends on your requirements. If you just want to visualize typical traffic
conditions, MapServer can do the job, it's pretty straightforward. Just
join your road geometries with the congestion data (actual speed /
free-flow speed), apply some filters (SQL conditions) on road class and
maybe congestion (omitting non-congested roads), and render that in the
appropriate color.

If, on the other hand, you have a feed with speeds that vary frequently, it
gets tricky because you can't really use a regular tile cache. I ended up
abandoning MapServer for this - the problem was not so much the rendering,
but PostGIS was getting overwhelmed. If you get your speed data from a
company like HERE or INRIX, you should be able to use their tilers. If not,
you have a nice challenge.

On Sun, Feb 23, 2020 at 11:20 AM Steve Lime <sdlime at gmail.com> wrote:

> How are the data stored? With PostGIS one could aggregate features
> (ST_Collect?) based on an attribute and render that. You’re still drawing
> each segment but likely more efficiently.
>
> —Steve
>
> On Sat, Feb 22, 2020 at 4:25 PM Atlanta Geek <atlantageek at gmail.com>
> wrote:
>
>> Is there a good way to show heavy traffic using mapserver without drawing
>> each individual road segment as a different line.
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