On 03/12/2019 09:47, Edward Bainton wrote:
Hi all
General Elections Online
<https://electionresults.parliament.uk/#Cities%20of%20London%20and%20Westminster> (hosted
at parliament.uk <http://parliament.uk>) have got a failed page where
the Google map is overlaid with "Development purposes only".
I was planning to suggest they use OSM instead.
Can anyone point me to the precise technical detail their webmaster
will need? Is it the wiki page, Deploying your own Slippy Map
<https://wiki.openstreetmap.org/wiki/Deploying_your_own_Slippy_Map>?
It depends very much on what they want to do.
At the highest level, they have a choice of two options - they can pay
someone else to provide a service to them or they can create something
themselves without using a third party.
IF someone else is providing a service the amount work that they need to
do could be anything from nothing (like a new kitchen planned and
installed for you for lots of £) to quite a lot (order some units from
B&Q and assemble it yourself).
Andy's already mentioned https://switch2osm.org/ - that has an
(incomplete) providers list at https://switch2osm.org/providers/ . Many
of the organisations there will be able to help and will be able to help
them and may offer different products for different levels of involvement.
There's also the "completely do it yourself" option, which is actually
somewhat easier than the kitchen analogue of a pile of timber from
Jewson's. One option that would achieve this would need:
* Some map tiles underneath (which don't need to be hugely detailed)
* A way of displaying constituency boundaries on top
* A way of handling "user clicks on constituency A, display details"
The hard part might actually be making the whole lot robust enough to
cope with demand over the next couple of weeks. What wouldn't be a good
idea would be using an existing set of free-at-the-point-of-use map
tiles (such as the ones at OpenStreetMap.org) and expecting them to
"just cope" with the volume - see
https://twitter.com/OSM_Tech/status/1122495446465810438 for what
happened when the London Marathon did that (for completeness the
relevant policy is at
https://operations.osmfoundation.org/policies/tiles/ ).
If they did want to "completely do it themselves" then
https://switch2osm.org/serving-tiles/manually-building-a-tile-server-18-04-lts/
will get them some raster map tiles, and
https://switch2osm.org/using-tiles/ and the examples at (to pick just
one example) https://leafletjs.com/ will allow them to create overlays
over those, and allow people to click through for particular information.
With regards to the "hard part" they can restrict the map zoom to
something that is not too high (enough so that constituencies are
visible and clickable should be good enough) prerender tiles and cache
them, but I'm sure they must have lots of familiarity with this sort of
problem given that they already run a public and intermittently very
busy website.
Best Regards,
Andy
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