-------- Original Message -------- Subject: RE: Re: USGS quad numbers Date: Wed, 25 Feb 2009 08:18:31 -0600 From: John M Anderson <[log in to unmask]> To: <[log in to unmask]> References: A<[log in to unmask]> Hello All, The Louisiana Department of Transportation and Development using the same scheme which also starts the northwest corner of the state. Most users who get their maps from LaDoTD request them from us by the number-letter combination. USGS started including the Louisiana DoTD number-letter designator under the adjacent quadrangles diagram on their editions in the mid-1990s. John John M. Anderson Map Librarian and Director Cartographic Information Center Department of Geography & Anthropology LSU Baton Rouge, LA 70803 (225) 578-6247 -----Original Message----- From: Maps, Air Photo & Geospatial Systems Forum [mailto:[log in to unmask]] On Behalf Of Maps-L Moderator for Arlyn Booth Sent: Tuesday, February 24, 2009 8:50 AM To: [log in to unmask] Subject: Re: USGS quad numbers -------- Original Message -------- Subject: RE: USGS quad numbers Date: Tue, 24 Feb 2009 08:48:56 -0600 From: Booth, Arlyn <[log in to unmask]> To: <[log in to unmask]> It's on the indexes from the Illinois State Geological Survey. I always assumed it was theirs. Arlyn Booth Map Coordinator Illinois State Library 300 S. 2nd, Rm. 305 Springfield, IL 62701-1796 (217) 558-4140 FAX (217) 557-6737 [log in to unmask] Jesse White, Secretary of State & State Librarian -----Original Message----- From: Maps, Air Photo & Geospatial Systems Forum [mailto:[log in to unmask]]On Behalf Of Maps-L Moderator for Jenny Marie Johnson Sent: Monday, February 23, 2009 11:08 AM To: [log in to unmask] Subject: USGS quad numbers -------- Original Message -------- Subject: USGS quad numbers Date: Mon, 23 Feb 2009 11:07:14 -0600 From: Jenny Marie Johnson <[log in to unmask]> Reply-To: [log in to unmask] To: MAPS-L <[log in to unmask]> I've been asked about a historic map numbering scheme for USGS quads. The system would have been in use perhaps in the early 1970s. 15-minute quads were assigned a 1-3 digit number. I believe that Illinois index that I saw this on started the numbering in the NW corner of the state and went across rows of quads from W to E and then back to the W to begin the next line (in other words, numbers didn't seem to zig-zag). Within the 15-minute quads, the 7.5-minute quads were assigned letter designations (A, B, C, or D) going in counterclockwise order starting with the NE quad. I don't know if this was an official scheme or if it was homegrown. The person who asked me thought that these alpha-numeric combinations were used on USGS order forms. Obviously, if it was an official scheme it didn't last because USGS presented us with the 5-digit + letter + number scheme in the early/mid-1980s! The scheme vaguely feels like some of the really old AMS numbering schemes. Has anyone seen something like this for USGS quads? Many thanks! Jenny Marie Johnson Map and Geography Library University of Illinois at Urbana-Champaign [log in to unmask] 217-333-3855 ************************************************ Disclaimer - This email and any files transmitted with it are confidential and contain privileged or copyright information. You must not present this message to another party without gaining permission from the sender. If you are not the intended recipient you must not copy, distribute or use this email or the information contained in it for any purpose other than to notify the Office of the Illinois Secretary of State. If you have received this message in error, please notify the sender immediately, and delete this email from your system. Any views expressed in this message are those of the individual sender, except where the sender specifically states them to be the views of the Office of the Illinois Secretary of State. ************************************************