-------- 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
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