Fig. 2.

Schematic of the geometric correction. With a known sensor position (p) and look direction (θ_L) the position of each pixel in the image space can be located in a real-world coordinate space. The pixel is located at the intersection (a) of the input digital surface model (shown in green) and a straight line that is projected at the pixel dependent look direction from the sensor position. The look direction is the angle at which incoming electromagnetic radiation is observed by any given pixel of the hyperspectral imager [10]. The look direction is calculated from the attitude, focal geometry and boresight misalignment of the sensor during data acquisition [10,18].