I'd be inclined to use the same process, but in QGIS and using several locations across map to double check or avg scales (important if not equal dist projection).

David Medeiros
Stanford Geospatial Center

Sent from my iPhone

> On Aug 17, 2017, at 12:33 PM, Rick Grapes <[log in to unmask]> wrote:
> 
> Hi all,
>  
> Question.  Does anyone have experience in using Google Maps’ Measure Distance function, to calculate the scale of a map, where no scale exists in any form on the paper map?  And if so, is it accurate enough for cataloging purposes? 
>  
> I’m presently cataloging a map of Toronto.  Found a record in OCLC, but the scale in the 255 doesn’t look right to me.  A gut feeling.  So using Google maps, I measured the distance between 2 points on the ground and then my map, and did the math.  Turns out the record was off by 3000.  Not a whole bunch, but measureable.  Was wondering what other map catalogers may think.
>  
> Thanks muchly,
> Rick Grapes
> BYU Maps Cataloger