41results about How to "Reduce field work" patented technology

The invention discloses a monocular vision plane distance measuring method free of photo-control. The method comprises the following steps of a measurement system integration stage: fixedly connectinga camera and a laser range finder to form a direct oriented vision measurement system; a measurement system calibration stage: performing integrated calibration on the measurement system to determinecamera internal parameters, distortion aberrations and an eccentric angle between the camera and the laser range finder, and correcting the nonlinear distortion, measured elevation and attitude of the camera; and a plane distance measurement stage: establishing an "image-distance" transformation relationship between the image plane and the object plane based on a central projection imaging principle of the collinearity of the image point, optic center and object point of the camera in an oblique angle of view, and finally realizing the monocular vision plane distance measurement free of photo-control. The method provided by the invention has low hardware cost and operational complexity, greatly reduces the workload in the field by completing the measuring point layout in a few minutes with no need to arrange photo-control points on the plane to be tested, and has universality without depending on the prior knowledge in the scene.

The invention discloses a road surveying and design method based on high-resolution satellite images. The steps are: A. According to the route plan, determine the range to be covered by satellite images, select high-resolution satellites and sensors for collection, and design high-resolution satellites Stereoscopic image acquisition. B. When the results with a scale of 1:2,000 are generated, the field ground control point layout and measurement are carried out, and the control points are laid out along the route. C. Based on the rational polynomial parameters of high-resolution satellite images, the block adjustment of high-resolution satellite stereoscopic images is carried out, and the digital ground model, digital orthophoto map and digital line-drawing topographic map of the highway route area are generated. D. Collaborative design of high-resolution satellite survey and highway CAD, calculate the quantity of the project, and generate route design diagrams and tables. The invention realizes the collaborative design of high-resolution satellite measurement and road CAD, greatly reduces the workload in the field, greatly shortens the survey and design cycle, and has remarkable economic and social benefits.

The invention discloses a photo-control-point survey method through strip-shaped testing area low-altitude photogrammetry and relates to the technical field of photogrammetry. The method comprises the following steps: determining mapping accuracy according to strip width, strip length and terrain category of a to-be-tested area and a mapping scale; determining a course point distance a and a lateral point distance b of the photo-control point according to the terrain category, the strip width, the mapping scale and the mapping accuracy of the to-be-tested area; symmetrically arranging one row or a plurality of rows of photo-control points on the left and right sides parallel to central lines of track, and arranging landmarks; measuring the coordinates and heights of the photo-control points by using a total station, a level gage or a GNSS RTK method. According to the method disclosed by the invention, the quantity and position of reasonable photo-control points can be determined according to actual conditions, the condition that the construction difficulty is extremely high due to excessively dense photo-control points can be avoided, the field workload can be alleviated, the labor intensity is reduced, and the construction period is shortened. Meanwhile, the problem that the mapping accuracy cannot meet the specified requirement due to extremely low density of the photo-control points is solved.

The invention discloses a system and method for measuring bridge deflection based on close-range photographic measurement. According to the system and method for measuring the bridge deflection based on the close-range photographic measurement, the problem that in a special environment, a contact type displacement measuring instrument can not be installed is solved. The system for measuring the bridge deflection based on the close-range photographic measurement comprises a total station, two single-lens light reflection cameras, an industrial control computer, 4-5 control points arranged on piers, 6-8 control points arranged on uprights and three target points. The measuring distance of the total station is 5m-50m and the shooting distance of the two single-lens light reflection cameras is 3m-15m; the three target points are located on supporting point portions and in the middle of each stride of the bridge, the control points arranged on the piers are arranged on two piers, and the control points arranged on the uprights are arranged below and in front of the three target points. The distance between the abscissa and the ordinate of every two adjacent control points of the control points arranged on the piers and the control points arranged on the uprights is 3m-10m. The industrial control computer and the two single-lens light reflection cameras are connected through signal lines. The invention further provides the measuring method.