Distance between two points in a map and between scan lines to define the size of the map
This is a scalar (s) in an algorithm of the form: x' = x + sd, where d is the direction vector After d is chosen (nonzero), the step size is specified One step size selection rule is line search; another is a fixed sequence, like s_k = 1/k
Distance between two points in a raster and between scan lines to define the size of the raster