Can this be your place?
-----Original Message-----
From: Metamorphic Studies Group [mailto:[log in to unmask]] On Behalf Of Reia M. Chmielowski
Sent: Wednesday, August 31, 2011 8:30 AM
To: [log in to unmask]
Subject: Re: Finding microprobe spots
One doesn't even need a print out of the photo--I
log my microprobe spots by bringing my notebook
computer along, opening the photo of the sample
in CorelDraw (though most any drawing program
should work for this), locking that layer and
then adding circles over the photo in the
appropriate places, which I colour code (redish
for garnet, blue for white mica, brown for
biotite, etc.), and I give each circle a name
that matches the spot name recorded by the
microprobe. I also mark phases I check for
composition but don't do an analysis on (like
quartz) so that I have a record of those,
too. This is the habit I developed while
analyzing experimental results, where I actually
sit with the probe for each analysis, so there is
plenty of time available to create the record in
the drawing program while the probe does the analysis.
When doing my PhD instead of sitting with the
probe while it did the analysis we would program
the points to be done and then leave it to work
overnight, so I used a different technique: I
drew marks of the spots on a print out of the
photo and then later imported the X-Y coordinates
from the probe into ArcMap and aligned a digital
copy of the image with those points. Usually it
was only necessary to align two or three spots
towards the edges of the group of them and all of
the other spots would then show up on the image
in the same places as I had marked on the paper.
Both methods are nice because one has the names
of the spots and so can open the program and zoom
straight in to a specific analysis point of
interest. A word of warning: If you use the
ArcMap method and are later transferring to
another university which does not have a ArcMap
licence make good, annotated, printouts (jpg is
good enough) of every sample, in case you want to
look things up later. It is annoying to have
files with such useful data in them and not be
able to open them on the new computer...
--Reia
at 09:44 31/08/2011, Jochen wrote:
>Hi David,
>
>isn't it better avoiding the problem in the
>first place, either by logging probe spots (if
>you have the equipment), or defining each
>individual spot with the help of the backscatter
>image, having a blow-up photo of the garnet at
>hand. Modern microprobes also give you the
>coordinates of the measurement spot. If you take
>the coordinates of all your spots and import
>them into a GIS program, you can get a map of
>your points with the correct distances. Unless
>you automatically probe/scan a straight line,
>your path will have curves and bends and
>ultimately be longer than the garnet diameter.
>
>This won't help you now, but should be useful
>when planning future garnet probing.
>
>Best wishes,
>
>Jochen
Reia M. Chmielowski
Dipartimento di Scienze della Terra
Università degli Studi di Milano
Via Botticelli 23, 20133 Milano
phone +39 02503 15609
mobile phone +39 388 1199 386
fax +39 02503 15597
http://users.unimi.it/~spoli/thelab.html
http://unimi.academia.edu/ReiaChmielowski
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