Hi! I'm working for a project that aims to measure IUU (illegal, unregulated and unregistered) fishing (globalfishingwatch.org). For this I'd like to be able to classify vessel track points as withing various areas, e.g. MPAs, economic zones and national waters, of which OSM contains the last one.
I'm trying to extract this dataset and import it into a PostGIS instance for further processing. According to http://wiki.openstreetmap.org/wiki/Tag:boundary%3Dmaritime#Territorial_sea_.2812.C2.A0nm_zone.29 the borders should have these attributes boundary=administrative since so many had a problem with grouping it together with maritime borders maritime=yes to state that this is a maritime border, so it can be rendered correctly/different from land borders admin_level=2 since it is a national boundary border_type=territorial to distinguish it from borders on land I tried extracting these borders using osmosis/bin/osmosis -v \ --read-pbf-fast file=planet-latest.osm.pbf \ --tf reject-relations \ --tf reject-nodes \ --tf accept-ways boundary=administrative maritime=yes admin_level=2 border_type=territorial \ --write-xml file=12M.osm I then imported this into PostGIS using osmosis/bin/osmosis -v --read-xml file=12M.osm.bz2 --write-pgsimp-dump directory=12M and the SQL script osmosis/script/pgsimple_load_0.6.sql. Now to the problem: * I see a bunch of nodes all over the place, some even inland: http://cdb.io/1QjDRGN * I see only 40 ways with nodes, all somewhere on the border of Iran: http://cdb.io/1QjE2Sq I tried the following query to find the number of ways with nodes: select count(*) from (select ways.id, st_makeline(nodes.geom) line from ways, way_nodes wn,nodes where wn.way_id = ways.id and wn.node_id = nodes.id group by ways.id) a where line is not null; Thanks in advance, Egil
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