Abstract: The invention relates to a method for identifying individual trees in airborne lidar data and a corresponding computer program product. The method comprises: a. obtaining lidar data points of a group of one or more trees; b. define voxels in a regular 3D grid on the basis of the data points; c. applying an image segmentation algorithm to obtain at least one segment; and, if at least two segments are obtained: d. find the root voxel and branch voxels of a first segment and a second neighbouring segment; and e. merging the first and second segment if the distance between the first and second root voxel is less than a first threshold, the distance between the first root voxel and the closest second branch voxel is less than a second threshold; and the distance between the first branch voxels and the second branch voxels is less than a third threshold.

Abstract: A press type automatic screwdriver includes a press member, a drive link, a screwdriver bit, and a screw thread pair including a screw rack and a gear engaged with the screw rack. The press member and the screwdriver bit are secured to opposite ends of the drive link, the press member and the drive link are connected by the screw thread pair, and the screw rack is resisted by the press member. The gear is secured on an end of the drive link. When the press member is pressed, the press member pushes the screw rack, the screw rack drives the gear to rotate, the gear drives the drive link to rotate, and the drive link drives the screwdriver bit to rotate.

Abstract: The invention relates to a method for identifying individual trees in airborne lidar data and a corresponding computer program product. The method comprises: a. obtaining lidar data points of a group of one or more trees; b. define voxels in a regular 3D grid on the basis of the data points; c. applying an image segmentation algorithm to obtain at least one segment; and, if at least two segments are obtained: d. find the root voxel and branch voxels of a first segment and a second neighbouring segment; and e. merging the first and second segment if the distance between the first and second root voxel is less than a first threshold, the distance between the first root voxel and the closest second branch voxel is less than a second threshold; and the distance between the first branch voxels and the second branch voxels is less than a third threshold.

Abstract: A press type automatic screwdriver includes a press member, a drive link, a screwdriver bit, and a screw thread pair including a screw rack and a gear engaged with the screw rack. The press member and the screwdriver bit are secured to opposite ends of the drive link, the press member and the drive link are connected by the screw thread pair, and the screw rack is resisted by the press member. The gear is secured on an end of the drive link. When the press member is pressed, the press member pushes the screw rack, the screw rack drives the gear to rotate, the gear drives the drive link to rotate, and the drive link drives the screwdriver bit to rotate.