 Two images of the same area in a vineyard. The image on top is was taken at low altitude using a 24-megapixel camera. It features low ground-sampling distance. The lower image was taken at ten times the altitude using a state of the art 100-megapixel camera, and features high ground-sampling distance.. For analysis of relatively small areas, the image at the top yields much more accurate information, for obvious reasons.&amp;nbsp; 