Hi all,
I'm preparing a road import for Finland based on NLS of Finland (nls.fi) dataset. Since OSM is quite complete in many areas already and even significantly exceeds the quality of the NLS dataset the import is meant to be selective. I.e., I've calculated isolated subnets in the road dataset that do not overlap significantly with existing OSM data, only those parts are to be imported in the phase 1. All subnets are supposed to be manually reviewed as there's also some additional road classification that cannot be done solely based on NLS classification system. The task will be divided by subnet granularity to mappers in Finnish OSM community. Please check the more detailed plan: http://wiki.openstreetmap.org/wiki/Fi:Maastotietokanta/Road_Import_Stage1_Plan I've done some preliminary discussions/previews with OSM community in Finland (although I also wanted to be quite selective on where I post direct links to .osm.gz files as sadly some people tend to be too trigger-happy). In general, the OSM community in Finland is quite excited about the dataset and I received some positive and constructive feedback from there which was useful to improve the toolset to calculate the subnets in a more useful manner. There are discussions about the NLS dataset and also about importing it in various threads at forum's Finland area. Currently the biggest open question is how to actually distribute the subnets and do the bookkeeping of the progress? - The most optimal solution would be to have subnet bboxes to appear on map and reservation, download, done/problems marking could be done using its interface but my webside programming skill are not good enough to come up such system in a reasonable time. This approach is somewhat similar to OSM tasking manager's but different enough that enabling tasking manager to have such different task selection interface is beyond my web coding skills (the griding would be probably easy enough to circumvent by selecting huge cell size). - Another potential tool which is somewhat similar is Maproulette but again it would require some modifications. - The simplest alternative I've though for the task selection is just have big tables in wiki and do the bookkeeping but I'm not sure if it would really work well or not. Some background about NLS dataset: More than a year back NLS opened up quite significant portion of their datasets under a free license [1] but right from the beginning it was unclear how strictly the attribution requirements are to be interpreted (whether all users of OSM data need to repeat it or whether mentioning it on the /copyright page is enough). There were some non-written confirmations that /copyright page would be enough but only very recently there was also email reply stating exactly that [2] which re-triggered this import planning once again. I've run earlier some analysis over NLS dataset, done some comparing between them and based on that there have been improvements to both dataset which could be performed without deriving the data directly from the other dataset (NLS has been doing improvements based on our discoveries too [3]). While playing with both dataset, I've been forced to look the NLS dataset from many places so that I've become somewhat familiar with it. From prior experience we do know that the road data is reasonably correct (many people have used NLS.fi dataset based maps in Finland) but based on my experience with the actual data, there are quite many objects that are disconnected although on map they would appear as joined together (most likely due to inaccurate clicks during map drawing similar to what all OSM mappers probably have encountered themselves too). Obviously we want these errors to be fixed rather than duplicated into OSM. -- i. [1] http://www.maanmittauslaitos.fi/en/NLS_open_data_licence_version1_20120501 Available only in Finnish: [2] http://forum.openstreetmap.org/viewtopic.php?pid=356296#p356296 [3] http://wiki.openstreetmap.org/wiki/Fi:Maastotietokanta/Virheet _______________________________________________ Imports mailing list [email protected] http://lists.openstreetmap.org/listinfo/imports
