Ground truth can help you find the required phenomenon (plant stress, weeds, diseases, etc.) on the map. Using the Ground truth image, the algorithm distinguishes between the required phenomenon and others.
Ground truth is easiest to add with a pin or via polygons (annotations):
Have in mind that the polygon where you want to add ground truth images must be inside another polygon.
When you share a map, you also share pins and the ground truth images. This is a convenient way to share all the data with your agro-advisor.