Today, I announced my bid for Fort Collins City Council, in District 5 (the current councilmember, Kelly Ohlson, is term-limited). You can read all about it at http://www.rosscunniff.com - it should be a great adventure!
I got two GoPro Hero3 Black cameras and am planning a panoramic project with them. However, to do the project correctly and accurately, I need a good read on their field-of-view. So, I set up a tripod and a grid and a tape measure, and took a few photos. Here they are, desaturated and contrast-enhanced, with central red dots and some annotations. First, measuring the diagonal FOV:
Next, the horizontal FOV:
Finally, the vertical FOV:
The front of the camera lens was almost exactly 17 inches from the grid. The camera body started about 17.25 inches from the grid. Assuming the sensor is embedded some distance into the body, I used an estimated field-to-sensor distance of 17.5 inches. This yields the following field-of-view, in degrees:
Doing a little interval math on the field-to-sensor distance shows these angles are accurate to about plus or minus 1.5 degrees.
Interestingly, Photoshop seems unable to correct the barrel distortion of th…
A few years ago, I converted various planet maps to icosahedral models. You can print these out, cut along the solid lines, fold along the dotted lines, and have a nice icosahedron to play with. Since then, two more robot spacecraft have created global maps of planetary bodies. Most recently, the New Horizons spacecraft flew past Pluto. Here is an icosahedral projection of the data we have so far:
Also fairly recently, the Dawn spacecraft has orbited both Vesta and Ceres, two of the largest asteroids (or "dwarf planets" as the new nomenclature has it) in the Solar System. Here are icosahedral projections of those two. First, Vesta:
Next, Ceres - note the mysterious white spots toward the upper right:
I wanted to make a Christmas present for my middle-school-aged niece, and I wanted it to be science-related. So, I found these images at various places on the web (starting at the very nice page assembled by Steve Albers). I then wrote a computer program to turn the images into the maps you see here - projected onto icosohedra (20-sided solid objects).
It reminded me once again what a remarkable time we are living in. When I was born, *none* of these maps would have been possible. And many of them have only been made possible in the last decade (in fact, the Mercury and Vesta maps were just made this year).