I don't think this actually went out on tdwg-content, so I'm forwarding it. Steve -------- Original Message -------- Subject: RE: [lpig] magnification/extent of objects present in images Date: Fri, 5 Apr 2013 20:27:54 +0000 From: Boyce Tankersley btankers@chicagobotanic.org To: steve.baskauf@vanderbilt.edu steve.baskauf@vanderbilt.edu, TDWG Content Mailing List tdwg-content@lists.tdwg.org References: 515C9790.3040507@vanderbilt.edu

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

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