In order to detect the parked vehicle, it is important to calculate an overall luminous intensity profile (from morning
to late evening) of the sun at an vacant parking slot. The profile indicates and helps to set a threshold. When any
vehicle arrives at the parking slot, it will be parked over the LDR Sensor, which will intersect the contact of the sun
light with sensors surface aperture, creating a shadowing effect. Thus, resulting in a significant decrease in luminous
intensity. The value of the luminous intensity at which the shadow will be created over the sensor, is the threshold
value. Which is used as a reference, for vehicle detection in future. Therefore, initially the sensor is deployed at the
center base of the parking slot to monitor the luminous intensity profile of the sun from 9:00 AM in morning till 7:00
PM in an empty parking slot as shown Fig. 2(a)