OpenStreetMap
While examining the limits of the internal zones in UK waters, a recent Statutory Instrument defines one of the points on a boundary as being at longitude 02°42'95"W. Anyone know what I'm supposed to make of this? Other than the usual government incompetence, of course.
Tartışma
RichardB tarafından 17 Ağustos 2010 saat 22.43 tarihinde yapılan yorum
I've seen the document for the Welsh border - and it has many points with greater than 60" - too many for it to be an isolated mistake. Perhaps they're not seconds of arc, but decimal minutes? In which case, your coord is 51º32.53' N, 2º42.95' W
RichardB tarafından 17 Ağustos 2010 saat 23.37 tarihinde yapılan yorum
Right, they are in decimal minutes, and not seconds of arc. The reason I can tell is because most of the coordinates are also defined in SI 1999/762 - which defines the border in the Dee & Severn Estuaries. If you convert the coords in SI1999/762 from OSBG36->WGS84 - then the points lie extremely close to those from the latest document with decimal minutes - but much further away with seconds of arc.
chriscf tarafından 18 Ağustos 2010 saat 00.35 tarihinde yapılan yorum
I have worked on that assumption for the Welsh points, and not on that assumption for the Scottish baseline (the points fit better as arcseconds than decimal minutes). However, I realize I may have accidentally used the decimal minute conversion for the Northern Ireland limits, so will probably need to reimport those (and redraw the lines).