Not really in developing countries which the OP is talking about.
While most developed countries have aerial imaging campaigns on some recurrent schedule (NAIP in the US is on a rolling 3-year cycle), this is usually not the case in developing countries.
Quite a few never had any large scale aerial imaging campaigns and most do not have them on regular schedules.
While most developed countries have aerial imaging campaigns on some recurrent schedule (NAIP in the US is on a rolling 3-year cycle), this is usually not the case in developing countries.
Quite a few never had any large scale aerial imaging campaigns and most do not have them on regular schedules.