You may notice slight colour changes in different parts of the PhotoMaps as they are captured on different days of the year and at different times of the day. Other factors such as smog and pollution will also cause such colour differences. Although we use the same camera settings for each flight, you will see from our historical data that we have deliberately tested different colour balances on our cameras to determine the best settings to maximise PhotoMap quality. Most areas are too large to be surveyed in one day and we have to fly these over numerous days. You might therefore notice slight colour differences within a survey – for example if we fly late in the afternoon and then continue the survey early the next morning.