line number

The azimuth time of a certain line (number) $t_{al}$ is computed as:

$$t_{al} = t_{a1} + {(l-1)\over{\rm PRF}}$$ (D32)

Where:
$t_{a1}$ is the azimuth time to line 1 (first line).

And the line number l, given a certain azimuth time $t_a$, can be computed as:

$$l = 1 + {\rm PRF} (t_a - t_{a1})$$ (D33)

Where:
$t_{a1}$ is the azimuth time to line 1 (first line).