Re: [talk-au] JOSM on handheld device
Ive tried a few packages such as opencitymap and OSM-tracker, but they all seem to have pre-requesites that arent identified on the download sites. I figure I cant be the only person who wants to edit OSM from my GPS device, so Im hoping someone might have a few ideas for apps worth a play with, before I give up and look at writing my own. I use osm2go on a nokia n810: https://garage.maemo.org/projects/osm2go It is written in C, and it might be a decent starting point. I haven't poked the code at all to see how portable it is, but it is actively developed and very usable. Andy David ___ 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] Tagging help
Hi all, if anyone could give me some assistance with a few tags that would be great. I'm trying to get St Ives showground mapped ( http://osm.org/go/uYqBCJiO6- ). I can do about 45 minutes of wandering around there every few weeks, so it is slowly getting better. There are a couple of things it has, which I don't know how to tag. Or I think I know, but the tags used have long been abandoned on the wiki. I took photos today, so I would have something to ask about. If they are useful enough to go on the wiki, then I'm happy for them to be licensed whatever. Don't count on this url being available in a month though. http://www.ultra-premium.com/scratch/whatarethese/index.html 1) A dog training area. The best I can see is: sport=dog_training http://wiki.openstreetmap.org/wiki/Proposed_features/Dog_training 2-3) Model plane flying field. The best I can see is: sport=model_aerodrome http://wiki.openstreetmap.org/wiki/Proposed_features/Model%27s_Aerodrome 4) Horse saddling thing. I don't really know what this would be called. There are a couple around the place, most are on concrete. 5) Horse exercise area. This is what they call it on the map (which I forgot to photograph). According to the wiki for sport=equestrian: Equestrianism, sports involving the skill of riding or driving horses. Often associated internationally with show jumping and dressage, but also including endurance riding, eventing, reining, tent pegging, vaulting, polo, horse racing, driving, rodeo and more. But this seems to throw away a whole lot of information if I just tag it as sport=equestrian, because it looks nothing like the actual equestrian centre just to the north of it. I'm happy to leave it tagged as sport=equestrian though. 6) This was a fenced off thing, which might have been a scaled topographic map of the area... but I'm not really sure. 7) Remote control car racing. Currently tagged as leisure=track sport=rc_car_racing ... I'm fairly sure this one is wrong :) Any assistance appreciated. Andy ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] Running stats against GPX files ...
On Thu, 2009-06-25 at 05:16 -0700, John Smith wrote: JSON offers most of the advantages of XML, without a lot of the drawbacks, XML is often referred to as a horse designed by a committee and they ended up with a camel :) The way I see it - XML is good for marking up text. JSON is good for describing structured data. If HTML was based on JSON, it would be somewhat ugly, and I think an XMLish like thing suits it well. On the other hand, I think JSON is a good fit for a gps trace (since it is just structured data), and using XML is bleh. The big reason that XML gets used everywhere is because it gets used everywhere :). If a language didn't have a JSON library and an XML library, the XML one would get written first. So even though it is a clumsy language for lots of things, it is at least a clumsy standard language. ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] Hi all ...
If one was really trying to hunt someone down with OSM, a carefull study of their edit history would most likely reveal information about their location anyway. I previously had all my traces private. Then, I realised that if someone wanted to track me down, they could just look me up in the phone book... or ask me. (actually, I had them private because I thought they were rubbish, but it turned out to be a bug in the thing I was viewing them in, and it added an extra point at the start, at a random location) Andy ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] Uploading traces (Was; Hi all ...)
On Thu, 2009-06-18 at 15:25 +1000, Ross Scanlon wrote: * improving routing information, by working out average speed on roads (at different times). If your connected to the internet that's fine but it's no use for on the road re-routing, unless you have all the gps traces downloaded to your gps. This should be tagged by maxspeed anyway. Maximum speed is different to expected speed. What I'm talking about is the ability to work out which road is generally the best at a certain time. For example, I know if I use the highway at 8, it is clogged with people going to work, but if I use the alternative route a bit later, then it is clogged with school parents. This sort of data is mostly static (when you consider enough dimensions), and unrelated to maximum speed. Some one may have also driven the road really slowly (push bike) and some one may have done it at the speed limit. This would skew any reliability. Hence the need for lots of data. All the algorithms that do this stuff are designed knowing that there will be noisy data. Google has their own version of something like this, except real time. They attach gps transmitters to some taxis and have sensors on roads, and bring all that information in to try to work out what the average speed is on different roads. If a taxi is parked, or a road sensor is busted, it doesn't freak out and declare that the average speed is 0. * improving height maps, by taking (lots of) samples where altitude information was present. Pointless, vertical data is grossly out from a gps you are better off using the NASA dem data. You can still find out useful things from noisy data, as long as there is enough of it that you can filter out the noise, and since we already have a starting point for the data, we can be even smarter. Throwing more information at the problem helps us get a better solution - even if some of the information is noisy. * automatically guessing the number of lanes on a road, by looking at the variance of traces over sections in each direction. Should be tagged anyway (when more than 1) and how do you know it's not an accuracy problem. re accuracy problem: same answer as before. re should be tagged anyway: that may be true, but they often aren't. If an automatic process can fix up most of them, then it saves us time. And if we revisit the tagging later to make it more expressive (e.g. saying which specific lanes end), then this will save a lot of time. I was going to say look at the sat photo but that dosn't help as its covered over with trees. We have to trust that osm's are putting in accurate data but from what I've seen the data already there is miles better than google maps particularly in rural Australia. Absolutely (and I only checked because it isn't too far out of my way). But, if someone has the time to do cool things with the gps traces, then they will be very thankful for any more data. I know of one person who uses the raw gpx traces from OSM to improve the accuracy of another gps (it tries to model the walking patterns of a person, so it can predict how their speed will change as they turn corners and stuff like that). I don't know a whole lot about it, but this person was begging me for my gpx traces because he wanted even more data... so obviously there are some uses for it :) Just to reiterate - I don't personally care if you do upload or not. But if you are holding back from uploading because you think it isn't useful, then I'd disagree. Andy ___ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] How to map out streets the most efficently
On Wed, 2009-06-17 at 19:27 +1000, Liz wrote: On Wed, 17 Jun 2009, James Livingston wrote: There's a nice mathematical algorithm for figuring out that. It's a problem given to all computer science students to solve: the travelling salesman. The more points to cover, the more processing power it uses which makes the way the human brain can solve those problems really cool. (sorry, I didn't get my comp sci degree for nothing :)) Actually, this is the Chinese Postman Problem, which is closer to the problem of finding a Eulerian path, which is actually very possible - even without knowing the map before hand (with a few assumptions). The travelling salesman problem tries to find a short path between lots of places, but it doesn't make any attempt to cover every street, so it will miss out on lots of roads. Exciting computer science ahead. Read on if bored (you've been warned): A Eulerian path is a path that goes down every road exactly once, which is exactly what you want. Unfortunately, it is only possible to do when there are 0 or 2 intersections with an odd number of roads leading into them (a dead end counts as an intersection too). And, if there is a pair of intersections with an odd number of roads, then we need to start on one of them (and we'll finish at the other). And yes, you also need to have full knowledge of the map when you are planning, there also can't be one-way streets or turning restrictions. If you ignore the restriction from the previous paragraph for now then: 1) Keep driving until you hit an intersection. 2) Go down a road you haven't been down. If there are multiple roads which you haven't driven down, then pick any of the roads to follow, unless choosing one would split the set of undriven roads in two. Now to fix the dead end and T intersection problem, before you start: 1) Find an intersection with an odd number of roads going to it. 2) Find the shortest path from it to any other intersection with an odd number of roads going to it. 3) Add a fake road along that path, so you are then allowed to travel down it more than one time. For example, if you have a T intersection leading to a dead end, then the dead end road would get a fake road placed over the top of it. (but like most maths, this would probably end up making things worse if you actually tried it - as it is much quicker to go straight than to be constantly making right hand turns everywhere, and this algorithm doesn't care) (oh, and someone suggested that if the roads were all in a grid, you could do smart things to take into account the redundancy, and just zig-zag through, knowing you can extrapolate later... I don't know of any algorithms that will find the best path in these cases - you would need to add a fair bit of extra magic to existing graph theory to solve it) Andy ___ 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] Rivers
I have a nokia n810 which I have used on foot to edit a map in the middle of the day. I used osm2go: http://maemo.org/downloads/product/OS2008/osm2go/ Which is actively developed, and lets you pick an area, download the osm data for it, make offline changes (with the gps on) and then upload it later. While you walk around, it draws your current position, and a trace. If you are the sort of person who likes buying toys, then you might want to consider it (though I suspect it will be superseded soon, as the sdk for the next version is being distributed now - so if you wait a bit, then either you can get it cheaper, or get a newer shinier thing). The gps in it isn't great, but it does the job (it can take a while to get a lock). The screen is awesome (800x480, but fits in your pocket, and is transflective, so instead of washing out the screen, some of the sunlight is reflected back to work like a backlight. If you are a programmer, then you probably want one of these, otherwise, take my enthusiasm for it and halve it :) Andy On Wed, 2009-05-20 at 15:07 -0700, delta_foxt...@yahoo.com wrote: --- On Wed, 20/5/09, ed...@billiau.net ed...@billiau.net wrote: I've tried something like this in the car but daylight is too bright to see anything on the computer screen, and my sunglasses don't have a reading correction built in. You could get something like the Panasonic Toughbook which is designed to be used outdoors and in coal mines, but I'm trying to do everything on a smart phone. ___ 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
