Abstract: The present invention relates to a setup (100) for constructing a weed map. The setup (100) comprises an image recording unit (110; 110?) having a video camera (112) and a relief-tracking laser camera (114), an image processing and evaluating unit (120), a data storage unit (130) connected to the latter, as well as a weed database (135). The setup (100) also comprises a light source (160), a position detection unit (150) equipped with a location finding element (152) and a location refining element (154) for determining the spatial coordinates supplied by the former more accurately. The image recording unit (110; 110?), the position detection unit (150) and the light source (160) are all in data communication connection with the image processing and evaluating unit (120).