In each pixel the five Type 2 sensors with the highest Local Reputation Score are the Lead Type 2 sensors in that pixel.
Lead sensors enjoy higher rewards, as in each pixel and for each sensor type, rewards are split as follows: 90% to the lead sensor(s) and 10% to the backup sensor(s).
Clearly if there are no backup sensors, 100% of the reward pool goes to the lead ones. In each pixel, sensor scores are updated daily so lead status is reassessed every day.
If two or more sensors of the same type have the same Local Reputation Score in a given pixel, priority to get lead status is attributed to the sensor which first streamed data in that pixel.