Improvement in or relating to crop spraying or other crop or horticultural assessment operations

摘要

An assessment operation for assessing the pattern or performance of crop spraying by a crop spraying aircraft (1) comprises sensing the differential temperature characteristics at the ground due to wet (4) and unwetted (5) areas of the crop during spraying. Suitable sensing means (2, 6) are used on the aircraft (1) for this assessment, such as for example infrared camera equipment to provide a thermal image of the ground. A particular use of the assessment is to assist guiding of the crop spraying aircraft (1) so that substantially optimum spray cover by the aircraft can be achieved, and to this end the sensing means (2, 6) can be linked to the aircraft navigational equipment.