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Reply To: | Maps-L: Map Librarians, etc. |
Date: | Fri, 18 May 2018 15:12:40 -0400 |
Content-Type: | multipart/alternative |
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Hi Rick,
I would go with what you came up with measuring the bar scale on the map. You are partially correct about Google Maps and their use of a projection that might/could be different than the one used on the paper map and that alone could account for the discrepancy. In addition, screen resolution may also play a factor. All that said, as catalogers we are to describe from the resource, and so that is why I advise delivering what you got from the map itself.
Paige
From: "Rick Grapes" <[log in to unmask]>
To: "[log in to unmask]" <[log in to unmask]>
Sent: Friday, May 18, 2018 2:55:26 PM
Subject: A scale question.
Hi all,
I have a calculating scale question. This map I’m cataloging has a bar scale. I measured the bar, did the math, and got the ratio.
Just for the fun of it I also measured between 2 points on the map, as far apart as the map would allow, obviously much greater than the bar scale, then measured between the same 2 points on google maps, and again did the math. The difference was about 10%. Which calculation would you trust? Granted, either entries in the 255 would be an approximation. A potential issue could be divergent projections etc. Any suggestions?
Rick Grapes
BYU Map Cataloger
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