Re: [OSM-talk] Computing the 12-mile line
Roland Olbricht wrote: I will give more detailed explanations or run the tool on a particular region if you would like to. But I'm abroad for some days from tomorrow morning. So please ask, I'll try to answer on thursday evening. Hi, I want to run your extractors on the Turkey and Cyprus extracts from geofabrik (the files from 7.3.2009 to be precise), but report-results simply throws a segmentation fault. I'm not that experienced in debugging c++ code anymore, do you have a hint how I could proceed? All I did as to now is to replace the -O3 in the compilaton line with a -g, but I don't even get a core file yet. Regards, Hakan -- The Key To Immortality Is First Living A Life Worth Remembering. ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Computing the 12-mile line
I created control lines perpendicular on the coast and used these to find the nodes for the 12-nm line, where the distance to other country was less than 24 nm I used the same technique to find the mereidan line between the countries. I did this along the entire coast of Brazil. I will need to redo it with a script and a position database for baseline, 12nm, 24nm and eez I used JOSM, as I can move around on the map freely, and get lengths of lines as I create them (12nm = 4m) -- On Fri, 20 Feb 2009 23:41:26 +, Thomas Wood grand.edgemas...@gmail.com wrote: I just tagged up the one I found in the database, I attempted to use GIS software to create a section where it misses a scottish island, but failed after 2-3 days of playing, I can't recall who put the data in originally. I'd be interested in seeing any code put into svn for others to use. On 20/02/2009, Adrian Frith adr...@frith.co.za wrote: For those of you who have been adding the 12-mile territorial waters line: did you calculate that data by offsetting the coastline/baseline? And if so, how did you do it? I mean: what software did you use, and how? Thanks, Adrian ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk -- Brgds Aun Johnsen via Webmail ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Computing the 12-mile line
I just tagged up the one I found in the database, I attempted to use GIS software to create a section where it misses a scottish island, but failed after 2-3 days of playing, I can't recall who put the data in originally. I'd be interested in seeing any code put into svn for others to use. On 20/02/2009, Adrian Frith adrian at frith.co.za wrote: For those of you who have been adding the 12-mile territorial waters line: did you calculate that data by offsetting the coastline/baseline? And if so, how did you do it? I mean: what software did you use, and how? I've generated the source code with a tool handwritten in C++. You can find the source code in the file sweep-brim.c on the site http://wmaz.math.uni-wuppertal.de/olbricht/osm/ The code itself is a mess and far from being user friendly, I wrote it merely to use it by myself. I stopped to use it because it fails on quite a lot of coastline errors. But I would be glad to reanimate it if you would like to use it or understand it. If you would like to get a particular piece of coastline, just ask for it. The basic idea of how to use it: Feed it a file of coastlines and a file with the resprective nodes. You can produce these files with osmosis by filtering for ways tagged as natural coastline and the nodes they point at. Or you can use the script coastline-extractor from the same site with a .bz2-file as the only argument, then use filter-nodes-bbox (compiled from filter-nodes-bbox.c) with a bounding box for the four arguments. Finally you can feed the two files as arguments to sweep-brim. The compiling flags for filter-nodes-bbox.c and sweep-brim.c are given in the file coastline-extractor. Unfortenatley, you then have to manually dig the right component from all the produced data - the tool produces also junk data for the onshore side of a segment and it is pretty hard to find and truncate the correct brim automatically. I've done it by hand. Be aware that the whole process is quite slow. The extraction of the coastline can take some hours. The calculation of the brim should take some minutes. Then the upload might take quite a lot of time - the coastlines of France and Spain were a weekend and the United Kingdom another weekend. The basic idea of how it works: Image the planet covered with equidistant scanlines along the latitudes (the distance between to scanlines is currently 0.001 degrees of latitude). Now you add for every segment of every way from the coastline all the intervals of points on each scanline that are less than 12 nm from any point of that way (simplified: take into account only the endpoints of the segment and the intersections with the scanlines - the inaccuracies won't matter compared to the scanline gaps or the projection correction). After the tool has taken the union of all those intervals, it spans a way from interval border to interval border. I will give more detailed explanations or run the tool on a particular region if you would like to. But I'm abroad for some days from tomorrow morning. So please ask, I'll try to answer on thursday evening. There is also a tool mentioned on Regards, Roland ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
[OSM-talk] Computing the 12-mile line
For those of you who have been adding the 12-mile territorial waters line: did you calculate that data by offsetting the coastline/baseline? And if so, how did you do it? I mean: what software did you use, and how? Thanks, Adrian ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Computing the 12-mile line
I just tagged up the one I found in the database, I attempted to use GIS software to create a section where it misses a scottish island, but failed after 2-3 days of playing, I can't recall who put the data in originally. I'd be interested in seeing any code put into svn for others to use. On 20/02/2009, Adrian Frith adr...@frith.co.za wrote: For those of you who have been adding the 12-mile territorial waters line: did you calculate that data by offsetting the coastline/baseline? And if so, how did you do it? I mean: what software did you use, and how? Thanks, Adrian ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk -- Regards, Thomas Wood (Edgemaster) ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
