On 2020-2-26 8:48 am, Erik H wrote:
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.
How is the data created and stored? How large is the area? We do a bunch
of things as a traffic services company, and have found that different
things work better for different scenarios. MapServer and GeoServer have
both worked for us in the past. The challenge is always on how pretty
you want it to be, how much compute you're willing to spend, how often
the data updates, etc.
It's correct that the regular tile cache doesn't expire data in the best
way to support this :)
Best Regards,
Mohit.
2020-2-27 | 1:44 pm.
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