[OSM-talk] Preview: national cycle network map

Steve Chilton S.L.Chilton at mdx.ac.uk
Thu Jul 19 11:32:25 BST 2007

Couple of further thoughts.
I would think that best order would be :
1 "non-involved" detail - all the background stuff
2 red/blue emphasis lines for NCN - which will show around layer 3
3 way detail that it is on - road, bridleway, cycleway etc
4 NCN ref numbers
NB: there are some inconsistencies z-values at present. Look where route 4 comes into NE of Richmond Park (can't do URL to it) first (unclassified?) road is above and when swings south the road (service?) is below.
There are artefacts where "sections" of red/blue butt up, which multiply in sections are very short. Is this because of transparency? Can you look at that? At first I thought they had some special significance. In my view it detracts from smooth visualising of the routes.
I like Blackadder's suggestion for bringing up non-ncn cycle specific stuff - change emphasis in mapnik style sheet? But beware of coalescing data.
Maybe Artem could answer directly on shield/shift issues.
With a bit of tweaking I will be asking permission to use this as an exemplar of use of OSM data at SoC conf in September.

	-----Original Message----- 
	From: Andy Allan [mailto:gravitystorm at gmail.com] 
	Sent: Thu 19/07/2007 11:00 
	To: Steve Chilton 
	Cc: OSM-Talk 
	Subject: Re: [OSM-talk] Preview: national cycle network map

	On 7/19/07, Steve Chilton <S.L.Chilton at mdx.ac.uk> wrote:
	> Andy
	> Initial thought is that it looks excellent.
	> Two suggestions spring to mind having zoomed through layers in to Richmond:
	> Can you make the blue and red overlays more transparent? It would be good to see more clearly what the underlying way type is - road, bridleway, footway, etc.
	There's a couple of z-index issues I need to look at - roads are
	rendered over cycleways at the moment, so when they are adjacent it
	looks misleading. I'm considering trying to make the tagged ways
	render in front of the highlighting, and the highlighting above the
	non-involved ways, so that the underlying type is more obvious.
	> Secondly can you somehow filter the number of occurences of the NCN number? In Richmond Park it is obviously number 4 at all times and doesn't need all those labels.
	Yeah, that's the mapnik shieldsymbolizer "minimum radius" thing I had
	asked about previously on the lists (for the coloured boxes). It's
	apparently in a the head version of mapnik but I haven't got that
	running yet.
	I'd also tried shifting the in-line numbers at high zoom to the side
	of the route (since the higher the zoom, the less you want the route
	overwritten), but I couldn't make dy="80" work on the textsymbolizer.
	Works fine for point names (e.g. pubs) but I couldn't make it work
	when writing on the lines.
	> Otherwise really encouraging. Good work.
	> Cheers
	>         -----Original Message-----
	>         From: talk-bounces at openstreetmap.org on behalf of Andy Allan
	>         Sent: Thu 19/07/2007 10:23
	>         To: OSM-Talk
	>         Cc:
	>         Subject: [OSM-talk] Preview: national cycle network map
	>         Hi All,
	>         I'll call it a preview, since there's still more on my Todo list than
	>         on the Done list!
	>         http://www.gravitystorm.co.uk/osm/  - a mapnik-based cycle layer
	>         Shows the UK national cycle network, and local cycle networks at
	>         higher zoom. Have a look at Putney, south west of central london, for
	>         an area with both national and local (London) cycle networks.
	>         I'm very interested in feedback, and I've got more plans to render
	>         more features and play with the rendering, but I thought I'd "release
	>         early" etc. I'm also keen to know if there are similar cycle networks
	>         in the osm database for other parts of the world - if you know of
	>         them, please let me know where they are and I'll look at rendering
	>         them too.
	>         Feedback appreciated, positive or negative.
	>         Cheers,
	>         Andy
	>         PS - This takes about 5 hours to render on a modest PC, and other hour
	>         to transfer to my new web host. I'd strongly recommend people play
	>         more with Mapnik than trying to set up the entire tiles-at-home kind
	>         of thing, since the physical infrastructure required by mapnik is
	>         much, much less.
	>         PPS - Thanks go to Dave Stubbs (randomjunk) for his help with this.
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