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Four tables can be rendered as map, as part of their postgis geometry structure.
The first is the tr_countries_cou table. This table contains a column for country order which corresponds to the order which the wgeel follows to produce tables. It also contains the identification of the country as used by wgeel (ISO2-two letter names) and the ISO3 code (three letter names).
The second and third are the tables for the emus. The tr_emu_emu table contains a table of all eel management units(EMUs) as extracted from the wise layer. One EMU can be part of two countries (e.g. IE_Norw) in which case two lines will be present in the emu table, one for country. Another table the tr_emusplit_ems adds more detail, as some EMUs can flow in two differents seas, or belong to different RBDs. For instance the Atlantic and the Mediterranean. For EU countries for which a wise layer was available, those will correspond to different lines and different polygon geometries.
