Re: [talk-au] Optimising map rendering for recreational use
Hey Ben and others, Yep, spot on, rendering hints but only related to zoom levels. I realise that it's matter of opinion what roads to be rendered at what levels etc and why rendering hints are not considered factual data and not preferred. Changing the road classification is an option but are likely to cause side effects. For example, tagging what is a territory road as a primary so that it will be rendered earlier on in the zoom level has the potential of polluting the data, making it less useful for other purposes such as routing etc. Another positive of the rendering hints approach is that the tags themselves are completely optional so it's up to the rendering engine to take advantage of them. If ignored, it's like they Also these tags are only really needed in more regional / outback areas, such as the Great central rd, Tanami track, French line etc so it's lightweight and won't add much size to the database. I plan to start a new project for mapping off road and regional areas of Australia and these rendering hints will certainly make a huge difference in rendering. There are already quiet a few of interested in this project and was planning to start a new project page on the Aus Wiki to coordinate this effort. We were hoping to include the rendering tags among the guild line and hope you guys agree. Li On 01/11/2012, at 3:31 PM, Ben Kelley wrote: Hi. I think tagging for the renderer is a bad idea. Essentially you are talking more about render hints, but I think that becomes a matter of preference pretty fast. Especially when OSM data can be rendered in a number of ways. I think it is worth considering what about a road makes you want to render it as a different type of road. - Ben Kelley. On Nov 1, 2012 3:01 PM, Li Xia lisxia1...@gmail.com wrote: Hey everyone, have an idea about map rendering and want to get your thoughts. One of the challenges is in rendering a useful map for recreational use is displaying roads, tracks, trails and to some degree water lines at appropriate zoom levels in more remote regions where the density is lower compared with urban regions. In my opinion, most map service online services or offline vector engine experience the same issue. Here are some illustrations of the issue, by comparing Google / OSM / Raster map of the same region: Google OSM Raster map As you can clearly see, at that zoom level, there's no deal on either OSM or Google maps, where as the raster map is useful. yes you can zoom in on Google or OSM, but with a smaller viewing port, orientation is more difficult and you loose that overview which is try handy for trip planning. By using a tag specific for rendering purposes, this issue can be overcome. Rendering engines can take advantage of these tags to optimise rendering of various regions. The tags are fairly self explanatory. By tagging a road with render_as:trunk, this feature can be rendered at the same zoom level as a trench road. Each class of road will have it's own tag so if a highway:territory should be rendered at the same zoom level as a primary, then tag render_as:tertiary. What do you guys think? Cheers Li. ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] Optimising map rendering for recreational use
What do you guys think? It's non trivial to do it this way, but: - Define a relationship between zoom level and number of ways/nodes within the bounding box - Sort the ways in a weighted fashion - roads first, land boundaries second, etc - Zoom level max, with 10 nodes to render: well, that should likely render everything - Zoom level max - 1 with 1 billion nodes to render - roads only To actually set up the balance between zoom and what to render would be hard, but I think that's a better approach than render hints. Alternatively, after implementing it, you could add a 'render weighting/interest' attribute to a lot of ways, which would be *like* a render hint but also suitable for other purposes - ie: routing or search. ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] Optimising map rendering for recreational use
You can change how mapnik renders by defining different styles for different zooms. Essentially with render hints you are saying that you would like this way to look like a different type of way. If this does not map to some verifiable attribute of the way then it becomes your preference. Presumably there is something about the road that leads you to want it to look differently. Why not tag the physical (and verifyable) thing that is different, and change your style definition when you render it? Is it the surface? The importance? The width? The destination? - Ben. On Nov 1, 2012 5:13 PM, Daniel O'Connor daniel.ocon...@gmail.com wrote: What do you guys think? It's non trivial to do it this way, but: - Define a relationship between zoom level and number of ways/nodes within the bounding box - Sort the ways in a weighted fashion - roads first, land boundaries second, etc - Zoom level max, with 10 nodes to render: well, that should likely render everything - Zoom level max - 1 with 1 billion nodes to render - roads only To actually set up the balance between zoom and what to render would be hard, but I think that's a better approach than render hints. Alternatively, after implementing it, you could add a 'render weighting/interest' attribute to a lot of ways, which would be *like* a render hint but also suitable for other purposes - ie: routing or search. ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
[talk-au] Adelaide Metro using OpenStreetmap/OpenTripPlanner instead of Google Transit
Adelaide Metro, the umbrella brand for public transport in Adelaide on their new (beta) website at http://www.adelaidemetro.com.au/ are using OpenTripPlanner and OpenStreetmap for journey planning. Nice to see OpenStreetmap getting more, albeit unacknowledged exposure. Alex ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] Talk-au Digest, Vol 65, Issue 1
hi, I can think of two easier ways of doing this that setting rendering hints- one would be to change the rendering rules for set geographical areas, such as tanami track, ie when rendering within this geographic area use these rules for this zoom. A second but more complicated way to do it would be to query your database, see how dense an area is for data, then decide your rendering rules, so when it does down town sydney (dense data) - footpaths don't get shown, when you render tanami track (very little data) - footpaths are rendered and various options in between the two. This way it can be done programmatically and you don't need to add / edit the data. On Thu, Nov 1, 2012 at 4:10 PM, talk-au-requ...@openstreetmap.org wrote: Send Talk-au mailing list submissions to talk-au@openstreetmap.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.openstreetmap.org/listinfo/talk-au or, via email, send a message with subject or body 'help' to talk-au-requ...@openstreetmap.org You can reach the person managing the list at talk-au-ow...@openstreetmap.org When replying, please edit your Subject line so it is more specific than Re: Contents of Talk-au digest... Today's Topics: 1. Optimising map rendering for recreational use (Li Xia) 2. Re: Optimising map rendering for recreational use (Ben Kelley) 3. Re: Optimising map rendering for recreational use (Li Xia) -- Message: 1 Date: Thu, 1 Nov 2012 15:01:11 +1100 From: Li Xia lisxia1...@gmail.com To: talk-au@openstreetmap.org Subject: [talk-au] Optimising map rendering for recreational use Message-ID: 09ee5d87-fa98-495a-af9d-a60585482...@gmail.com Content-Type: text/plain; charset=us-ascii Hey everyone, have an idea about map rendering and want to get your thoughts. One of the challenges is in rendering a useful map for recreational use is displaying roads, tracks, trails and to some degree water lines at appropriate zoom levels in more remote regions where the density is lower compared with urban regions. In my opinion, most map service online services or offline vector engine experience the same issue. Here are some illustrations of the issue, by comparing Google / OSM / Raster map of the same region: Google OSM Raster map As you can clearly see, at that zoom level, there's no deal on either OSM or Google maps, where as the raster map is useful. yes you can zoom in on Google or OSM, but with a smaller viewing port, orientation is more difficult and you loose that overview which is try handy for trip planning. By using a tag specific for rendering purposes, this issue can be overcome. Rendering engines can take advantage of these tags to optimise rendering of various regions. The tags are fairly self explanatory. By tagging a road with render_as:trunk, this feature can be rendered at the same zoom level as a trench road. Each class of road will have it's own tag so if a highway:territory should be rendered at the same zoom level as a primary, then tag render_as:tertiary. What do you guys think? Cheers Li. -- next part -- An HTML attachment was scrubbed... URL: http://lists.openstreetmap.org/pipermail/talk-au/attachments/20121101/09bfd052/attachment-0001.html -- Message: 2 Date: Thu, 1 Nov 2012 15:31:50 +1100 From: Ben Kelley ben.kel...@gmail.com To: Li Xia lisxia1...@gmail.com Cc: talk-au@openstreetmap.org Subject: Re: [talk-au] Optimising map rendering for recreational use Message-ID: CAE4-2TKUbM= iek-a3q2wmulfy5wkxpyogtdsm3ds-zaoa+y...@mail.gmail.com Content-Type: text/plain; charset=iso-8859-1 Hi. I think tagging for the renderer is a bad idea. Essentially you are talking more about render hints, but I think that becomes a matter of preference pretty fast. Especially when OSM data can be rendered in a number of ways. I think it is worth considering what about a road makes you want to render it as a different type of road. - Ben Kelley. On Nov 1, 2012 3:01 PM, Li Xia lisxia1...@gmail.com wrote: Hey everyone, have an idea about map rendering and want to get your thoughts. One of the challenges is in rendering a useful map for recreational use is displaying roads, tracks, trails and to some degree water lines at appropriate zoom levels in more remote regions where the density is lower compared with urban regions. In my opinion, most map service online services or offline vector engine experience the same issue. Here are some illustrations of the issue, by comparing Google / OSM / Raster map of the same region: Google http://www.mud-maps.com/li_temp/1211/Screen%20Shot%202012-10-25%20at%204.42.31%20PM.png OSM http://www.mud-maps.com/li_temp/1211/Screen%20Shot%202012-10-25%20at%204.42.26%20PM.png Raster map http://www.mud
Re: [talk-au] Optimising map rendering for recreational use
Hi John, Why would it be limited to just 1 purpose? Any rendering engine can take advantage of these hints? Li. On 01/11/2012, at 5:11 PM, John Smith wrote: On 1 November 2012 15:01, Li Xia lisxia1...@gmail.com wrote: What do you guys think? what you are really after is a custom rendering that suits your purpose, it's not the easiest of things to do, but it's not rocket science either there is a number of people on this list that would be able to help you ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] Optimising map rendering for recreational use
Thanks for the suggestions, I couldn't agree more for static rendering. However this approach has some massive draw backs in terms of performance. Any suggestions in this region? Li. On 01/11/2012, at 5:13 PM, Daniel O'Connor wrote: What do you guys think? It's non trivial to do it this way, but: Define a relationship between zoom level and number of ways/nodes within the bounding box Sort the ways in a weighted fashion - roads first, land boundaries second, etc Zoom level max, with 10 nodes to render: well, that should likely render everything Zoom level max - 1 with 1 billion nodes to render - roads only To actually set up the balance between zoom and what to render would be hard, but I think that's a better approach than render hints. Alternatively, after implementing it, you could add a 'render weighting/interest' attribute to a lot of ways, which would be like a render hint but also suitable for other purposes - ie: routing or search. ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] Optimising map rendering for recreational use
Importance is of most interest. In regional areas where density is much lower, rendering lower class roads earlier on in the zoom level would improve the usability of the map much more. Li. On 01/11/2012, at 5:32 PM, Ben Kelley wrote: You can change how mapnik renders by defining different styles for different zooms. Essentially with render hints you are saying that you would like this way to look like a different type of way. If this does not map to some verifiable attribute of the way then it becomes your preference. Presumably there is something about the road that leads you to want it to look differently. Why not tag the physical (and verifyable) thing that is different, and change your style definition when you render it? Is it the surface? The importance? The width? The destination? - Ben. On Nov 1, 2012 5:13 PM, Daniel O'Connor daniel.ocon...@gmail.com wrote: What do you guys think? It's non trivial to do it this way, but: Define a relationship between zoom level and number of ways/nodes within the bounding box Sort the ways in a weighted fashion - roads first, land boundaries second, etc Zoom level max, with 10 nodes to render: well, that should likely render everything Zoom level max - 1 with 1 billion nodes to render - roads only To actually set up the balance between zoom and what to render would be hard, but I think that's a better approach than render hints. Alternatively, after implementing it, you could add a 'render weighting/interest' attribute to a lot of ways, which would be like a render hint but also suitable for other purposes - ie: routing or search. ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
[talk-au] Rendering hint suggestions
Hey Stephen, Appreciate the suggestions, I also thought about doing something similar to the idea of utilising density. The issue is one of performance, and sorting data no the fly is an expensive operation. Right now, data is sorted at compile time and stored in tiles based on the number of nodes, therefor each tile has very similar node count. Li. ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
[talk-au] Offline iOS rendering engine
Hey guys, Since we are on the topic of rendering, I should explain my background. I'm the Founder of Mud Map and we develop iOS app for outdoor recreational navigation, 4wd, hiking etcs. We've been working on a offline rendering engine for a while now and it works well with OSM data. Would you guys be interested in having a look and possibly because a beta tester? Your feedback would be much appreciated. Li. ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] Optimising map rendering for recreational use
Hi John, Why would it be limited to just 1 purpose? Any rendering engine can take advantage of these hints? On 01/11/2012, at 5:11 PM, John Smith wrote: On 1 November 2012 15:01, Li Xia lisxia1...@gmail.com wrote: What do you guys think? what you are really after is a custom rendering that suits your purpose, it's not the easiest of things to do, but it's not rocket science either there is a number of people on this list that would be able to help you ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] Optimising map rendering for recreational use
Thanks for the suggestions, I couldn't agree more for static rendering. However this approach has some massive draw backs in terms of performance. Another idea was using routes to define the importance, what do you guys think about this approach? Li. On 01/11/2012, at 5:13 PM, Daniel O'Connor wrote: What do you guys think? It's non trivial to do it this way, but: Define a relationship between zoom level and number of ways/nodes within the bounding box Sort the ways in a weighted fashion - roads first, land boundaries second, etc Zoom level max, with 10 nodes to render: well, that should likely render everything Zoom level max - 1 with 1 billion nodes to render - roads only To actually set up the balance between zoom and what to render would be hard, but I think that's a better approach than render hints. Alternatively, after implementing it, you could add a 'render weighting/interest' attribute to a lot of ways, which would be like a render hint but also suitable for other purposes - ie: routing or search. ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] Optimising map rendering for recreational use
Importance is of most interest. In regional areas where density is much lower, rendering lower class roads earlier on in the zoom level would improve the usability of the map much more. Li. On 01/11/2012, at 5:32 PM, Ben Kelley wrote: You can change how mapnik renders by defining different styles for different zooms. Essentially with render hints you are saying that you would like this way to look like a different type of way. If this does not map to some verifiable attribute of the way then it becomes your preference. Presumably there is something about the road that leads you to want it to look differently. Why not tag the physical (and verifyable) thing that is different, and change your style definition when you render it? Is it the surface? The importance? The width? The destination? - Ben. On Nov 1, 2012 5:13 PM, Daniel O'Connor daniel.ocon...@gmail.com wrote: What do you guys think? It's non trivial to do it this way, but: Define a relationship between zoom level and number of ways/nodes within the bounding box Sort the ways in a weighted fashion - roads first, land boundaries second, etc Zoom level max, with 10 nodes to render: well, that should likely render everything Zoom level max - 1 with 1 billion nodes to render - roads only To actually set up the balance between zoom and what to render would be hard, but I think that's a better approach than render hints. Alternatively, after implementing it, you could add a 'render weighting/interest' attribute to a lot of ways, which would be like a render hint but also suitable for other purposes - ie: routing or search. ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] Rendering hint suggestions
most renderers have smarter algorithms than just get rid of every 'x' nodes - they do it more like- reduce the number of nodes so that the feature deviates by less than 'x' distance / angle On Thu, Nov 1, 2012 at 6:46 PM, John Smith deltafoxtrot...@gmail.comwrote: On 1 November 2012 19:32, Li Xia lisxia1...@gmail.com wrote: The issue is one of performance, and sorting data no the fly is an expensive operation. there is already apps that do off line rendering, they pre-process data, and usually drop the number of nodes to 1/10th etc ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] Rendering hint suggestions
Other than skobbler, which is more for turn by turn, i've never seen anything that can render a regional map to the standard we are chasing. Nodes are already been reduced dynamically by marking each node at compile time with a level of importance. Issue isn't reducing nodes, it's more related to at which zoom level each road class is been rendered. Issues lies in the difference in density. A config that works well for metro areas doesn't work in regional areas. Li. On 01/11/2012, at 7:46 PM, John Smith wrote: On 1 November 2012 19:32, Li Xia lisxia1...@gmail.com wrote: The issue is one of performance, and sorting data no the fly is an expensive operation. there is already apps that do off line rendering, they pre-process data, and usually drop the number of nodes to 1/10th etc ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] Optimising map rendering for recreational use
Li, another complication worth thinking about. In theory, when we map a road, the highway tag needs to relate to the purpose of the road rather than the condition. This is a topic that has been under discussion for the last week or so. And renderers really only seem to be interested in the highway tag, ignore tags such as 4wd_only and tracktype (for other than highway=track). So, for example, roads such as the Tanami track or Plenty Highway are technically, primary roads. And therefore rendered at quite a broad zoom level. I got all upset about this as I am worried that potentially visitors see a nice thick line and assume its a nice road. (In fact they are great roads but not for the ill equipped!). I have been pushing the idea if we are to stick to the politically correct idea that highway is about purpose and not condition, then we need a reliable way to warn people reading the maps AND importantly, people building rendering engines what the condition might be. Please see the discussion page on http://wiki.openstreetmap.org/wiki/Australian_Tagging_Guidelines and http://wikiopenstreetmap.org/wiki/Key:tracktype I have suggested extending tracktype to, a) have additional levels of difficulty and b) clarify that this grading really does apply to all roads, not just highway=track I do think that this might be a better way to achieve what you want too. But the real issue is the mainstream renders and the routers won't think about it unless its widely adopted and used. As they say in the ALP, disunity is death ! David - Original Message - From: Li Xia To: Cc: Sent:Thu, 1 Nov 2012 15:01:11 +1100 Subject:[talk-au] Optimising map rendering for recreational use Hey everyone, have an idea about map rendering and want to get your thoughts. One of the challenges is in rendering a useful map for recreational use is displaying roads, tracks, trails and to some degree water lines at appropriate zoom levels in more remote regions where the density is lower compared with urban regions. In my opinion, most map service online services or offline vector engine experience the same issue. Here are some illustrations of the issue, by comparing Google / OSM / Raster map of the same region: Google [1] OSM [2] Raster map [3] As you can clearly see, at that zoom level, there's no deal on either OSM or Google maps, where as the raster map is useful. yes you can zoom in on Google or OSM, but with a smaller viewing port, orientation is more difficult and you loose that overview which is try handy for trip planning. By using a tag specific for rendering purposes, this issue can be overcome. Rendering engines can take advantage of these tags to optimise rendering of various regions. The tags are fairly self explanatory. By tagging a road with render_as:trunk, this feature can be rendered at the same zoom level as a trench road. Each class of road will have it's own tag so if a highway:territory should be rendered at the same zoom level as a primary, then tag render_as:tertiary. What do you guys think? Cheers Li. Links: -- [1] http://www.mud-maps.com/li_temp/1211/Screen%20Shot%202012-10-25%20at%204.42.31%20PM.png [2] http://www.mud-maps.com/li_temp/1211/Screen%20Shot%202012-10-25%20at%204.42.26%20PM.png [3] http://www.mud-maps.com/li_temp/1211/Screen%20Shot%202012-10-25%20at%204.42.22%20PM.png ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] Adelaide Metro using OpenStreetmap/OpenTripPlanner instead of Google Transit
On Thu, Nov 1, 2012 at 5:08 PM, Alex Sims a...@softgrow.com wrote: Adelaide Metro, the umbrella brand for public transport in Adelaide on their new (beta) website at http://www.adelaidemetro.com.**au/ http://www.adelaidemetro.com.au/ are using OpenTripPlanner and OpenStreetmap for journey planning. Nice to see OpenStreetmap getting more, albeit unacknowledged exposure. Are they pushing data into OSM? Or do we know if the installation has data services available? (Good to see the bus stops are URIs!) I remember approaching them several years ago, asking about data extracts of timetables/stop locations/etc to do mashups - I met with them, but I felt it went poorly at the time. It's interesting to see this as basically an about face! ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] Adelaide Metro using OpenStreetmap/OpenTripPlanner instead of Google Transit
My understanding is that real time data is sent from all Metrocard vehicles via GPRS to a central site. The supply of data is real soon now and they are keen to get developers using the data All of the timetable data and stop data has been available for a year or so as GTFS format, although hidden on their old site under site map. There is a copy also on GitHub. Getting back on topic I don't think their license condition permits upload to OpenStreetmap, but it wouldn't hurt to ask. Alex On 01/11/2012, at 9:11 PM, Daniel O'Connor daniel.ocon...@gmail.com wrote: Are they pushing data into OSM? Or do we know if the installation has data services available? (Good to see the bus stops are URIs!) I remember approaching them several years ago, asking about data extracts of timetables/stop locations/etc to do mashups - I met with them, but I felt it went poorly at the time. ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] Adelaide Metro using OpenStreetmap/OpenTripPlanner instead of Google Transit
All of the timetable data and stop data has been available for a year or so as GTFS format, although hidden on their old site under site map. There is a copy also on GitHub. Neat, wish I'd seen that sooner! Getting back on topic So I guess... What's the best kind of contribution that would make their use of OSM more relevant to the public? I put in a suggestion around looking at different renders - something more like the transport map would be useful (as it focused on bus stops and roads only), but I really don't know enough about the tools to judge how hard that is. House/street numbering, place names come to mind, but what else would people recommend? ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] Adelaide Metro using OpenStreetmap/OpenTripPlanner instead of Google Transit
On 01/11/12 23:43, Daniel O'Connor wrote: What's the best kind of contribution that would make their use of OSM more relevant to the public? Putting in the footpaths which aren't alongside the road. I mean the important ones which run between buildings to allow pedestrian access between streets without having to go the long way around (and following the route cars would have to take). John ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] Optimising map rendering for recreational use
As a traveller, I can certainly see merit to pushing a certain road to being rendered in a specific way. Most vector maps (OSM, Google, Apple, Navteq etc etc) have a big empty space in the centre. IMHO it would be very handy to be able to see some of these tracks rendered at a much higher (alt.) zoom than current, yet still see their road classification (suggestions for up-classing a track won't work as it may well suggest that a 4wd track like the French Line or Gunbarrell is a decent road!). Given that many of these tracks are 500-100km in length, the current zoom level you need to be at to see them makes visualising them a chore. It certainly would be handy if OSM rendered unpaved roads differently to paved roads. Nathan From: talk-au-requ...@openstreetmap.org talk-au-requ...@openstreetmap.org To: talk-au@openstreetmap.org Sent: Thursday, 1 November 2012 9:41 PM Subject: Talk-au Digest, Vol 65, Issue 4 Send Talk-au mailing list submissions to talk-au@openstreetmap.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.openstreetmap.org/listinfo/talk-au or, via email, send a message with subject or body 'help' to talk-au-requ...@openstreetmap.org You can reach the person managing the list at talk-au-ow...@openstreetmap.org When replying, please edit your Subject line so it is more specific than Re: Contents of Talk-au digest... Today's Topics: 1. Re: Optimising map rendering for recreational use (Li Xia) 2. Re: Rendering hint suggestions (Stephen Kelly) 3. Re: Rendering hint suggestions (Li Xia) 4. Re: Optimising map rendering for recreational use (David Bannon) 5. Re: Adelaide Metro using OpenStreetmap/OpenTripPlanner instead of Google Transit (Daniel O'Connor) -- Message: 1 Date: Thu, 1 Nov 2012 19:47:03 +1100 From: Li Xia lisxia1...@gmail.com To: Ben Kelley ben.kel...@gmail.com Cc: OSM Australian Talk List talk-au@openstreetmap.org Subject: Re: [talk-au] Optimising map rendering for recreational use Message-ID: ade71f15-a95d-4700-894e-e8599b8e1...@gmail.com Content-Type: text/plain; charset=iso-8859-1 Importance is of most interest. In regional areas where density is much lower, rendering lower class roads earlier on in the zoom level would improve the usability of the map much more. Li. On 01/11/2012, at 5:32 PM, Ben Kelley wrote: You can change how mapnik renders by defining different styles for different zooms. Essentially with render hints you are saying that you would like this way to look like a different type of way. If this does not map to some verifiable attribute of the way then it becomes your preference. Presumably there is something about the road that leads you to want it to look differently. Why not tag the physical (and verifyable) thing that is different, and change your style definition when you render it? Is it the surface? The importance? The width? The destination? - Ben. On Nov 1, 2012 5:13 PM, Daniel O'Connor daniel.ocon...@gmail.com wrote: What do you guys think? It's non trivial to do it this way, but: Define a relationship between zoom level and number of ways/nodes within the bounding box Sort the ways in a weighted fashion - roads first, land boundaries second, etc Zoom level max, with 10 nodes to render: well, that should likely render everything Zoom level max - 1 with 1 billion nodes to render - roads only To actually set up the balance between zoom and what to render would be hard, but I think that's a better approach than render hints. Alternatively, after implementing it, you could add a 'render weighting/interest' attribute to a lot of ways, which would be like a render hint but also suitable for other purposes - ie: routing or search. ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au -- next part -- An HTML attachment was scrubbed... URL: http://lists.openstreetmap.org/pipermail/talk-au/attachments/20121101/0b3fcc68/attachment-0001.html -- Message: 2 Date: Thu, 1 Nov 2012 18:49:07 +1000 From: Stephen Kelly st...@sjk.net.au To: John Smith deltafoxtrot...@gmail.com Cc: Li Xia lisxia1...@gmail.com, OSM Australian Talk List talk-au@openstreetmap.org Subject: Re: [talk-au] Rendering hint suggestions Message-ID: CAN3=ykz+dp45cai++hsdhkrf+d2wevgxuki4g7vqg-voz1z...@mail.gmail.com Content-Type: text/plain; charset=iso-8859-1 most renderers have smarter algorithms than just get rid of every 'x' nodes - they do it more like- reduce the number of nodes so that the feature deviates by less than 'x' distance / angle On Thu, Nov 1, 2012 at 6:46 PM, John Smith deltafoxtrot...@gmail.comwrote: On 1 November 2012 19:32, Li Xia lisxia1...@gmail.com wrote: The issue
