Fig. 2.

Kernels (A area in blue) are specified in terms of the rims of sectors of circles with subtending angle $2\psi$ and inner and outer rim radii $r^{min}$ and $r^{max}$ respectively. Kernels become step-selection functions when located at a point (x, y), provided an angle of heading $\theta$ (B), placed on a landscape (C) with cells of different levels of attraction or repulsion (green, yellow, and white squares) and admissibility (all cells that overlap with the kernel), and associated with a step selection rule $\mathcal{R}$