screamyGuy
EVERY year, we make a 16 mile pilgrimage to the top of Half Dome, a barren peak in the middle of Yosemite National Park. I took a GPS device on the trail in 2007 and realized six months later that there was a USB port on the handheld that would allow me to extract the data. Naturally, I was inclined to see if I could get the points to line up on some digital elevation models garned from the USGS.
Figure 1. Left mousedrag to look around. Right drag to zoom. Spacebar will toggle labels. Press 's' to advance to next point; 'x' for previous. a/z will adjust elevation model resolution.
by Matthew Kozak
Befuddled by the passage of time, my GPS told a harrowing story of me flying into the sky and under ground at random intervals. Then I realized that GPS altitude accuracy is not so good and wrote a routine to tie the points to the ground -- it's OK, even Google Earth resorts to these measures. Otherwise, the geographic registration of the points is pretty good.
Files
- Source (zip)(view online)
- built with Processing
- uses SGBackground
- uses SGCamera
- uses Tuple
- Standalone