Abstract: An efficient map matching method for GPS trajectory includes: obtaining a valid GPS point list; obtaining a current searched end point; backtracking a best map matching path from the current searched end point, traversing GPS points along the path to obtain best matching results, and summarizing the best matching results to output a matching result statistical table; and determining whether the current searched end point is a final point.

Abstract: The present disclosure provides an efficient map matching method for a global positioning system (GPS) trajectory, and belongs to the technical field of traffic. The efficient map matching method for a GPS trajectory includes the following steps: obtaining a valid GPS point list; obtaining a current searched end point; backtracking a best map matching path from the current searched end point, traversing GPS points along the path to obtain best matching results, and summarizing the best matching results to output a matching result statistical table; and determining whether the current searched end point is a final point. The present disclosure replaces the conventional “GPS point guided path search logic” with a “path search guided GPS point matching logic”, solves the problem of endless loop in backtracking of the emerging algorithm, avoids the complicated and inefficient map data calling process in the conventional matching logic, and greatly improves the map matching efficiency.

Abstract: A method for extracting attributes of starting and ending points of roads in batches from an urban regional road network: obtaining a line layer Shape file of the urban regional traffic road network, performing topology inspection and correction on the line layer Shape file to be stored as a line layer Shape2 file; processing the line layer Shape2 file to obtain data of a starting point, a turning point, and an ending point of each road to be exported as a point-line layer Shape3 file; intersecting point layer elements and line layer elements of the point-line layer Shape3 file and the line layer Shape2 file to be exported as a point-line layer Shape4 file; processing the point-line layer Shape4 file, exporting a .Csv file; and connecting the line layer Shape2 file with the Csv file to extract the attributes of the starting and ending points of the roads in batches.

Abstract: The present invention provides a bottom-hole impact-rotation stepping combined unloading rock-breaking efficient drilling system, including a housing, a drive assembly, a universal joint, a transmission shaft, a rotational impact assembly, and a drill bit; the transmission shaft is connected with the housing; the rotational impact assembly includes a rotational transmission assembly for conveying a rotational power to the drill bit and an impact assembly for providing a high frequency axial impact power to the drill bit; when the rotational transmission assembly rotates along with the transmission shaft, the impact assembly applies a high frequency impact force along a drilling axial direction to the rotational transmission assembly; an annular drill bit is disposed at an outer end of a drill bit body of the drill bit; a central drill bit is slidably disposed on an inner ring end surface of the annular drill bit; an inwardly-recessed cylindrical region is formed between a head end of the annular drill bit and

Abstract: The present invention provides a bottom-hole impact-rotation stepping combined unloading rock-breaking efficient drilling system, including a housing, a drive assembly, a universal joint, a transmission shaft, a rotational impact assembly, and a drill bit; the transmission shaft is connected with the housing; the rotational impact assembly includes a rotational transmission assembly for conveying a rotational power to the drill bit and an impact assembly for providing a high frequency axial impact power to the drill bit; when the rotational transmission assembly rotates along with the transmission shaft, the impact assembly applies a high frequency impact force along a drilling axial direction to the rotational transmission assembly; an annular drill bit is disposed at an outer end of a drill bit body of the drill bit; a central drill bit is slidably disposed on an inner ring end surface of the annular drill bit; an inwardly-recessed cylindrical region is formed between a head end of the annular drill bit and

Abstract: A hostless automobile reverse radar warning system installed to an automobile includes a reverse signal light power module for supplying an electric power required by the system, a plurality of distance sensing modules installed to an external periphery of the automobile for performing a distance detection to detect external environment conditions of the automobile, producing a distance detection result, and generating a warning signal based on the distance detection result, and a warning module for receiving the warning signal and producing a sound to alert a driver based on the warning signal.

Abstract: A hostless automobile reverse radar warning system installed to an automobile includes a reverse signal light power module for supplying an electric power required by the system, a plurality of distance sensing modules installed to an external periphery of the automobile for performing a distance detection to detect external environment conditions of the automobile, producing a distance detection result, and generating a warning signal based on the distance detection result, and a warning module for receiving the warning signal and producing a sound to alert a driver based on the warning signal.