Abstract: An aerial vehicle including a body, a first ranging device, a second ranging device and a controller is provided. The first ranging device is disposed on the body and is configured to detect a first distance between the first ranging device and the reflector. The second ranging device is disposed on the body and is configured to detect a second distance between the second ranging device and the reflector. The controller is configured to obtain an included angle between a direction of the body and the reflector according to the first distance and the second distance.

Abstract: System and method of intelligent surveillance and analysis mainly used for monitoring whether a field has an intrusion object (such as a thief), and instantly providing video or image of the suspected intruder to approved relevant individual (such as the house owner) for further confirmation of the presence of the intrusion object (such as thief); therefore, the wrongful determination by the computer is avoided. The aforementioned system includes, first the determination and extraction of the contour of the suspected intrusion object, then the continuous tracking of the suspected intrusion object according to the contour, continue capturing of images using the camera, and then storing these captured video temporarily, and finally notifying the house owner using the highest definition image of the video which occupies a lesser amount of bandwidth through various communication channels once the presence of thief is determined; the video is downloaded using higher bandwidth, and is played.

Abstract: A movable fish net buoy top, having the framework of a buoy top in association with a grid port which can be drawn up by 105 degrees, and pushed down by 75 degrees, so structured that as the top is laid on the surface of water the grid port on either side thereof will, owing to water buoyancy, be pushed up in bearing against a mortise joint catch furnished on top of the strut. When the buoy top is taken off the water surface, a mortise joint catch furnished at the bottom of the strut is deflected by 90 degrees, so as to prevent the grid port from moving downward toward either side due to gravitation, thereby preventing it from opening. To pour out the catch entrapped in the fish net, the mortise joint on top of the buoy top is turned to a setting in parallel with the surface level of the framework, and reverse the framework of the buoy top, so as to bring the grid port to open downwards along either side, so that the catch can be poured out, conveniently and effectively.