Fuente: Wipo "precision farming" An unmanned image capture system captures images of a field or work area using a first, spectral image capture system and a second video image capture system. Crop location data that is indicative of the location of crop plants within the field, is obtained. Evaluation zones in the image data generated by the first image capture system are identified based on the crop location data. Crop plants within the evaluation zones are then identified, analyzed to generate a corresponding emergence metric, and linked to a corresponding video image generated by the second image capture system.