Yes, that's what I was calling "splitting the slanted face" this morning. Keep going... :-) _______________________________________________________________________ stephen.gue...@simtable.com <stephen.gue...@simtable.com> CEO, https://www.simtable.com <http://www.simtable.com/> 1600 Lena St #D1, Santa Fe, NM 87505 office: (505)995-0206 mobile: (505)577-5828
On Fri, Jul 22, 2022 at 2:29 PM Frank Wimberly <wimber...@gmail.com> wrote: > Drop a perpendicular from the alpha vertex to S2. > > --- > Frank C. Wimberly > 140 Calle Ojo Feliz, > Santa Fe, NM 87505 > > 505 670-9918 > Santa Fe, NM > > On Fri, Jul 22, 2022, 1:34 PM Stephen Guerin <stephen.gue...@simtable.com> > wrote: > >> Today at Friam, I showed a small problem I was working on in >> photogrammetry. Attached is a Netlogo visualization of the geometry of the >> system. >> >> The problem is: given an image where we know two star coordinates (RA, >> DEC), solve for the field of view of the image. We can get the spherical >> angle between the stars (alpha) and we know the principal point and two UV >> coordinates in the image. These create a right triangle pyramid and I want >> to solve for the height X (focal length). Here's a diagram. >> >> [image: rightTrianglePyramid.jpg] >> Law of Cosines can get all the interior angles of the bases with S1, S2, >> S3. >> >> >> >> _______________________________________________________________________ >> stephen.gue...@simtable.com <stephen.gue...@simtable.com> >> CEO, https://www.simtable.com <http://www.simtable.com/> >> 1600 Lena St #D1, Santa Fe, NM 87505 >> office: (505)995-0206 mobile: (505)577-5828 >> >
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