-------- Original Message -------- Subject: Re: Simple? Cataloging Questions Date: Wed, 9 Sep 2009 13:25:15 -0700 (PDT) From: Kathy Stroud <[log in to unmask]> To: Air Photo & Geospatial Systems Forum Maps <[log in to unmask]> CC: Dawn Collings <[log in to unmask]> Thanks all for your prompt responses! Yes, a slip of the fingers gave me the wrong field. I'm going to go with Ken's answer as the most complete Kathy Stroud, Map/GIS Librarian Biological/Agricultural Sciences and Map Services, Shields Library 100 NW Quad Ave. Davis, CA 95616-5292 530-752-5248 ----- "Angie Cope" <[log in to unmask]> wrote: > -------- Original Message -------- > Subject: RE: Simple? Cataloging Questions > Date: Wed, 9 Sep 2009 14:12:11 -0400 > From: Grabach, Kenneth A. Mr. <[log in to unmask]> > To: [log in to unmask] <[log in to unmask]> > References: <[log in to unmask]> > > > > Paige put it really well. I want to add a bit, partly to make sure I > am understanding what you are really trying to ask. The coordinates > as given in 255 $c should be thought of as the corners of a > quadrangle. First are the West-East boundaries or corners. If you > have a map that straddles the Prime Meridian, say a map of Britain, of > France, North Africa, etc., the western coordinate would be rendered > as W, and the Eastern as E. If the meridian is one of the bounding > longitudes, you would render it depending on which hemisphere the map > is actually in. Where the Greenwich meridian as to the eastern edge, > the map is showing something in the Western hemisphere, so you would > use W. If the meridian is at the western edge, the map is showing the > Eastern hemisphere, and the longitude would be rendered as E. > > The same holds for the Equator, and the North-South boundaries or > corners. If the map straddles the Equator, you would use both N and S > for the coordinates of the map. If the map shows the Equator as at > the southern edge, the map is in the Northern hemisphere, and you > would use N. Conversely, if the map is in the Southern hemisphere, > with the Equator at the northern edge, you would use S. > > Cartographic Materials gives further explanation of this, in 3D. It > also tells how to render coordinates for world maps. But again, how > to render the Prime Meridian or the Equator only enter into it when > one or both is a bounding coordinate. You are really telling the user > what hemispheres the map portrays a view of: East or West, or both, > and North or South, or both. > > Ken Grabach <[log in to unmask]> > Maps Librarian Phone: 513-529-1726 > Miami University Libraries > Oxford, Ohio 45056 USA > > > -----Original Message----- > From: Maps, Air Photo & Geospatial Systems Forum > [mailto:[log in to unmask]] On Behalf Of Maps-L Moderator > Sent: Wednesday, September 09, 2009 1:51 PM > To: [log in to unmask] > Subject: Re: Simple? Cataloging Questions > > -------- Original Message -------- > Subject: Re: Simple? Cataloging Questions > Date: Wed, 09 Sep 2009 13:51:03 -0400 > From: Paige Andrew <[log in to unmask]> > To: [log in to unmask], [log in to unmask] > References: <[log in to unmask]> > > > > Kathy, > > You are mixing up your projection statement with your coordinates > values. No directional information goes with projection information, > only the name of the projection as it appears on the map goes into > 255$b. Coordinates go into 255$c and must include directional > information. Although not necessarily "politically correct" I think > the direction for Greenwich prime meridian has traditionally been "W > 0[degrees]" > > Paige > > At 01:37 PM 9/9/2009, Maps-L Moderator wrote: > >-------- Original Message -------- > >Subject: Simple? Cataloging Questions > >Date: Wed, 9 Sep 2009 10:08:08 -0700 (PDT) > >From: Kathleen Stroud <[log in to unmask]> > >To: Air Photo Maps-L <[log in to unmask]> > >CC: Dawn Collings <[log in to unmask]> > > > > > > > >In the Statement of Projection (field 255 $c) What is the direction > >(E or W?)for the Prime Meridian, 0 degrees? Do we have to fill in > >the direction blank? > > > >Thanks, > > > >Kathy Stroud, Map/GIS Librarian > >Biological/Agricultural Sciences and Map Services, Shields Library > >100 NW Quad Ave. > >Davis, CA 95616-5292 > >530-752-5248