-------- Original Message -------- Subject: Re: Simple? Cataloging Questions Date: Wed, 09 Sep 2009 14:45:11 -0400 From: Paige Andrew <[log in to unmask]> To: Maps, Air Photo & Geospatial Systems Forum <[log in to unmask]> References: <[log in to unmask]> Ken, Excellent! You put what I was thinking into words extremely well (and I don't have time on this end to tackle). THANKS! Paige At 02:27 PM 9/9/2009, you 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