Camera facts

• image size (7.144 x 5.358 mm) http://www.dpreview.com/products/panasonic/compacts/panasonic_dmclc40

• photo P2010248.JPG focal length 10.87

• therefore angle of view alpha = 2*atan(d / (2f)) is

  2*atan(7.144 / 2 / 10.87) * 180/pi

  [1] 36.38217

File list

• camera.R: First test of fitting pixel to xy.

• fit1.R: Demonstration of fitting of pixel to xy, with ground control points.

• fit2.R: As fit1.R but shows photo (slow).

• P1020248-gcp.dat: ground-control points, including pixels from P1020248.jpg as well as latlon pairs from google earth (see latlon-*.png)

• P1020248.jpg: a photo

• latlon-*.png: snapshots of google earth latlon, showing control points