Abstract: The disclosed subject matter relates to a method for detecting agricultural field work performed by a vehicle, comprising: a) carrying a satellite navigation receiver on the vehicle and recording a sequence of position fixes and associated time stamps; b) for a position fix: determining a group of position fixes that lie in a region; c) dividing the group into sub-groups on the basis of a minimum time interval; d) determining trajectory sections on the basis of the sub-groups; e) determining an attribute vector for the considered position fix comprising at least an angle between two trajectory sections; and, f) if the attribute vector satisfies a specified threshold criterion, detecting the position fix as a location of field work.

Abstract: The disclosed subject matter relates to a method for detecting agricultural field work performed by a vehicle, comprising: a) carrying a satellite navigation receiver on the vehicle and recording a sequence of position fixes and associated time stamps; b) for a position fix: determining a group of position fixes that lie in a region; c) dividing the group into sub-groups on the basis of a minimum time interval; d) determining trajectory sections on the basis of the sub-groups; e) determining an attribute vector for the considered position fix comprising at least an angle between two trajectory sections; and, f) if the attribute vector satisfies a specified threshold criterion, detecting the position fix as a location of field work.

Abstract: One example method is disclosed that includes the steps of capturing a plurality of images of a scene, wherein each of the plurality of images of the scene captures a different perspective of a portion of an object; establishing a three-dimensional (“3D”) model of the object using at least some of the plurality of images of the scene; initializing a T-spline based at least in part on the 3D model; determining a first photometric error associated with the 3D model and the T-spline; and optimizing the T-spline based on the first photometric error to create an optimized T-spline.