For those living specimens where measurements are critical we include a scale next to the plant 
part in the image.  

We currently have 25 photographers using their own cameras and I am not sure how we would be able 
to determine and/or document magnification levels without the use of a scale.  

If we were working with a single make and model of a camera attached to a microscope I think the 
issue of magnification of the raw image would be easier to determine.

Boyce Tankersley
Director of Living Plant Documentation
Chicago Botanic Garden

-----Original Message-----
From: live-plant-image-group@googlegroups.com [mailto:live-plant-image-group@googlegroups.com] On 
Behalf Of Steve Baskauf
Sent: Wednesday, April 03, 2013 3:57 PM
To: TDWG Content Mailing List
Cc: live-plant-image-group@googlegroups.com
Subject: [lpig] magnification/extent of objects present in images

I am cross-posting this to the Live Plant Image email list in addition to tdwg-content because 
this is a subject that was previously discussed there.  However, as this is part of the public 
review of the draft Audubon Core TDWG standard, I would request that you reply only to the 
tdwg-content list, so that any additional discussion will take place there for the record.  
If you aren't on that list and would like to reply, please send your responses to 
steve.baskauf@vanderbilt.edu and I will post it for you.


This subject came up as part of a comment on Audubon Core from Andréa
Matsunaga:

"In iDigBio (http://tinyurl.com/MISC-Media), some people have expressed the desire to have 
information about the magnification being used (to have a rough idea of the size of the object, 
potentially from data that is automatically retrieved from the capturing device) as well as the 
real world size depicted by a pixel (for the purposes of allowing one to make measurements on 
the image; this would require one to have a scale on an image and perform some arithmetic). 
Would it be possible to add such terms?"

There are terms in the SpatialMetrics terms (section 9.1) of the MIX vocabulary 
(http://www.loc.gov/standards/mix/ ) that can encode this kind of information.  However, I 
would be interested in opinions about whether expressing this kind of information is a narrow 
need that is outside the scope of a fairly broad standard like Audubon Core or if the need for 
such terms is perceived as widespread.

Steve

--
Steven J. Baskauf, Ph.D., Senior Lecturer Vanderbilt University Dept. of Biological Sciences

postal mail address:
PMB 351634
Nashville, TN  37235-1634,  U.S.A.

delivery address:
2125 Stevenson Center
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office: 2128 Stevenson Center
phone: (615) 343-4582,  fax: (615) 322-4942 If you fax, please phone or email so that I will know to look for it.
http://bioimages.vanderbilt.edu


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-- 
Steven J. Baskauf, Ph.D., Senior Lecturer
Vanderbilt University Dept. of Biological Sciences

postal mail address:
PMB 351634
Nashville, TN  37235-1634,  U.S.A.

delivery address:
2125 Stevenson Center
1161 21st Ave., S.
Nashville, TN 37235

office: 2128 Stevenson Center
phone: (615) 343-4582,  fax: (615) 322-4942
If you fax, please phone or email so that I will know to look for it.
http://bioimages.vanderbilt.edu