I want to say something to this, too. I´m using JOSM and as described by Ævar before the import, this was a easy to check all the data with the help of the color set. Thanks go to the authors.
I spent the last two days cleaning up Easticeland and parts of the eastern mid-highland. OK, these were two hard days but at least there is quite a lot new data now. A lot of ways that no one was driving before. Check the ways in the 900 area (besides that, am I the only one adding and caring the road system website on Icelandic wikipedia?!) There is in fact a lot of useful information in the data itself. And the connecting of all the ways and reconnecting is a quite big amount of work, but I´m sure you get through this. Anyways after spending some 35 hours the last two days I can tell one: I deleted around 90% of the data because it was already on OSM (shows the progress in OSM and the quality of the OSM data is IMHO in 95% of the ways I checked far superior), 10% is a good deal so far. And talking about the "5%". But there were a lot of highland tracks with great accuracy in the OFP data. I think this is not a perfect solution but all these roads that possibly might be taken from a map I marked with a FIXME for resurvey. Especially roads that are just 5 points on 10km seem quite suspicious to me. But anyways, who knows, maybe they are just very simplified? OSM is a dynamic project that will never end or be finished, so we always have the chance to kill hese resurvey ways. And for 95% of the ways I added there is still the source=ourfootprints tag to find the ways. And while checking the data I added and corrected some OSM data and relations as well. Thank you again to Ævar for the import. Greetings from the far east to the south... Christoph Am 17.01.2010 21:27, schrieb Ævar Arnfjörð Bjarmason: > On Sun, Jan 17, 2010 at 20:29, Karl Palsson<[email protected]> wrote: >> Ævar Arnfjörð Bjarmason wrote: >>> Tom að mestu rakið vegi bæði frá egin GPS ferlum og u.þ.b. 30 annara >>> sem hafa sent honum gögn en hann segir að um 95% af kortinu sé búið >>> til svona, 5% er teiknað eftir lokuðum kortum (LMÍ kortum geri ég ráð >>> fyrir), ár, vötn, jöklar og strandlengjan eru svo teiknuð eftir Google >>> Satellite myndum. >> >> How did you go about excluding the 5% that were copied from other maps? You >> do >> know that importing this has totally corrupted any claim OSM might have on >> being >> completely clean data? > > 5% of Tom's source dataset is partially derived from Google Maps / LMÍ > but none of what just got imported on OpenStreetMap. > > What the ourFootPrints import imported was a subset of the > ourfootprints.de dataset, it was just the GPX traced ways& none of > the Google Satellite traced waterways, POIs or various other things > that were either unfit for importing or we'll possibly do in the > future. > >> Further, what possibly motivated you to import this over reykjavik? We now >> have >> a great big pile of vomit, with no real known source or age, whose only real >> qualification is that a bunch of Germans made it before OSM existed. Good >> for >> them. > > When you do any sort of data import into an area with existing data > you're going to have conflicts. There are a few ways to deal with > that: > > * Delete all the existing data& Import the new one, obviously not > applicable here but this was done e.g. in Gaza > * Try to automatically or manually detect conflicts before > uploading. This was done for the Corine import& requires a lot of > programming / debugging / testing work or manual labour by a limited > group beforehand. > * Import the data on top of the existing data& clean it up later > > I went with the last option after it became clear that most of the > users doing regular edits (who replied on the list) were willing to > help clean it up afterwards. The whole import is only around 8000 ways > which isn't too big for such manual cleanup work. > > I'm sorry for any inconvenience this has caused and in the areas such > as Reykjavík where this import affects most users (especially those > using Potlatch such as yourself) I'll try to cleanup the data very > soon. I probably would have done so already for the capital area > except I've been fixing up the import slightly by deleting source=* > tags on all the nodes I imported. > > Most of the OFP data in Reykjavík and its surroundings will be > deleted, except some residential ways which haven't yet been covered > by us (like some in Kópavogur) and a few tracks. > >> While this surely has some very positive outcomes in unmapped areas, in other >> areas we now just have a mess that someone has to go out and _resurvey_ just >> to >> try and work out which one is right. > > How is this a bad thing? Once we're done with the cleanup we'll have > data in areas where we had none before. Sure that data may be out of > date or incomplete but it's still *some* data instead of none at all. > > We may need to treat ourfootprints data as implicitly needing > confirmation or resurveying of course, but in the meantime we at least > have something. > >> Further, large chunks of the OFP import in reykjavik isn't even >> _semantically_ >> correct, let alone geographically correct. Roads that overlay, but don't >> intersect, Roads drawn as straight lines, which may have been straight on >> original city plans, but clearly are not when you stand on the street, roads >> or >> connections that don't exist anymore. > > Yes a lot of the OFP roads don't connect with each other (although > some do). Errors like that can be easily fixed with the validator when > the data is imported. > > As for the accuracy see the point above. > >> In some other parts of the country, this was _possibly_ a good idea, but I'm >> sorry, I really think this was a bad idea to import the whole lot. > > Out in the country it was definitely a good idea. The import greatly > expands our coverage of the national highway system& various offroad > tracks. The quality of those ways is on par with or even surpassing > our own existing ways. > > _______________________________________________ > Talk-is mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk-is _______________________________________________ Talk-is mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-is
