Some time ago there was some discussion of modeling everything FWF and 3D
digitizers to accurately measure the complex dimensions of some of the
pieces that must go under the cowl. I vaguely remembered a process involving
photography to accomplish that end. That process involves taking a picture
or a series of pictures and then computing whichever coordinates you are
interested in. At that time I couldn't bring up the technical word. Today,
that word popped into my mind. It is photogrammetry.

Has anyone any information on the mathematics involved?

The motivation for all this is as follows. It seems to me that modeling the
bits and pieces that go under an aircraft cowl would be made much simpler if
we could simply take a series of pictures of the gadget to be modeled, feed
the resulting pictures to the computer and get accurate coordinates of the
said gadget, preferably in a machine readable form.

Doc Custer
Retired software engineer and sometime Audiologist Building RV9-A. Fuselage

You can do that in Rhino Doc. Under "View" move down to "Background Bitmap"
and select "Place". Choose a jpg as your back ground. You can then scale it
to the proper size knowing only one dimension. That is exactly what I did
here using the dimensions Mark sent me.

You then have to make the other measurements you are seeking manually.

Paul Lamar ...No rotor no motor.


Dr. Custer,

Photogrammetry is used to measure more than digitize.   We use it to align
large radio telescope surfaces.

We have a MetricVision MV-200 laser radar which can digitize.   This
technology is faster and more accurate than photogrammetry but not good for
outdoor applications.  We have digitized objects up to 60m on a side.

http://www.metris.com/products/laser_radar/laser_radar/

-Ben


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