Could someone please give me some further details of the angles in the PROJECT_sun_angles.csv file that is generated when using Pix4d and the sequioa in an ebee. I am assuming that the sunsensor_nadir_angle_degree is the angle of a normal through the sunsensor to the vertical? What is the sunsensor_sun_angle_degree relative to? There seems to be a lot of variability in the recorded angles during one flight (~40 degrees for sun angle; 20 degrees for nadir angle).
I have a site with quite sloping topography. I’m wondering about the potential of correcting the reflectance values based on angle of sun to slope; for which I’d want the sun angle relative to horizontal.
If anyone had existing workflows for correcting reflectance for terrain slope I would be interested to hear of them.
| Iain |