[mapserver-users] Show traffic on roads.

[Atlanta Geek]

The display traffic was an example and I was thinking it was just a GUI
thing.  What I am actually modelling is cable laid in the ground.  And what
I want to show is a heatmap representing the likelihood of there being an
issue at this point on the fiber.
The data will be stored as an array of numbers which each cell corresponds
to a distance along a route.  This array could be thousands of values.The
heatmap will be in the shape of the lines. So I did not want to have as
many line segments as I do cells in the array just to represent one cable.

On Thu, Feb 27, 2020 at 12:53 AM Mohit Sindhwani <ml3p at onghu.com> wrote:

> 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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