T3D Re: Photogrammetry in action

[Peter Homer <P.J.Homer@xxxxxxxxxxxxx>]

>In the September issue of Sci Am (just out) there is an
>article on the fossil footprints at Laetoli that the late
>Mrs. Leakey's team discovered some time back.  There is a
>contour diagram of a footprint done using two shots from a
>camera.  Nothing further about method is said in the article.
>Anyone know if this was done by hand (eye?) or if there was a
>computer program involved to automate the procedure to some
>degree?  I'm just curious - no current application.
>
>Thanks,
>John B

In the museum in Chamonix France there is a large contraption which was
used in the mapping of the Mont-Blanc Massif. To produce a contour map and
from that also a model. The device includes a stereoscope used to examine
aerial stereo pairs with a "Floating spot " device two points which could
be adjusted to give the same apparent depth that the feature they are
positioned over has. This seemed to be coupled to a large drawing board
which made up the rest of this device I think the adjustment of the spot
set the contour distance and its movement over the image drew the contours.
 PS I will not be able to reply to any questions arising from this post
untill September 7th .     P.J.Homer



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End of TECH-3D Digest 351
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