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338 results about "Line element" patented technology

In geometry, the line element or length element can be informally thought of as a line segment associated with an infinitesimal displacement vector in a metric space. Line elements are used in physics, especially in theories of gravitation (most notably general relativity) where spacetime is modelled as a curved Pseudo-Riemannian manifold with an appropriate metric tensor.

Road condition information generating method based on bus global position system (GPS) tracking data

InactiveCN104318767AAccurately reflect the road conditionsAccurate actual driving positionDetection of traffic movementRoad networksGps trajectory
The invention discloses a road condition information generating method based on bus global position system (GPS) tracking data. The method includes that (1) in a bus road network data structure, actual bus stations, station points, route intersection points and intersection nodes are expressed by nodes, each two adjacent nodes that are on the same road and in the same direction are connected through a line section, the line section is defined as a road section for representing a single-direction actual road section, and a driving direction of the road section is used as an associate attribute of the road section; (2) all GPS tracking data of n buses within certain time period T are obtained; (3) all GPS tracking data of the n buses are matched to the bus road network data structure; (4) average speed (img file='DDA0000591646390000011.TIF'wi='42' he='59') of h buses that are matched with the corresponding road section is used as road condition information of the actual road section. According to the road condition information generating method based on the bus GPS tracking data, the whole bus road network data structure is established through point elements and line elements, and road conditions of the road section can be accurately reflected.
Owner:BEIJING UNIV OF CIVIL ENG & ARCHITECTURE

GPU-based method for drawing linetype map symbol with gradually-varied width

InactiveCN105513110AImplement width gradient drawingFilling planer surface with attributesComputer graphics (images)Triangulation
The invention relates to a symbolization rendering technology in the GIS field and the digital map drawing field, provides a GPU-based method for drawing a linetype map symbol with a gradually-varied width, and realizes efficient rendering and drawing of gradual varying on width of a linear vector element based on the method. The method comprises the following steps: firstly determining a coordinate sequence of the line element needing to be drawn, initializing maximum and minimum line widths, according to the maximum width, building a line triangulation network subjected to triangularization, and transmitting a U parameter along a line direction and a V parameter vertical to the line direction to each vertex in the triangulation network; according to a map symbol unit needing to be filled, generating a corresponding color structural table, and transmitting the color structural table, a U-V parameter, the maximum line width and the minimum line width into a tinter program; by using Shader language, according to a U-V value on each vertex and the line widths, drawing pixels of the line element one by one based on a specified width gradual-varying function, thus realizing drawing of the vector linetype map symbol with the gradually-varied width.
Owner:NANJING NORMAL UNIVERSITY

Power transmission line defect detection method and system and electronic equipment

The invention relates to a power transmission line defect detection method and system and electronic equipment. The method comprises the steps of constructing a power transmission line defect detection model based on virtual and real sample integration and transfer learning according to image sample data of power transmission line elements, The method specifically comprises the following steps: step a, constructing a virtual and real integrated virtual sample generation and labeling model, integrating rich ground object information in virtual data and real image data, and fusing the virtual data and the real data; B, constructing a deep learning transfer learning model, and completing model optimization based on transfer learning; And step c, training a deep learning model based on a target detection algorithm, and carrying out abnormity diagnosis on the power transmission line element on the basis of target detection of deep learning. Through deep learning distributed training of massimage samples, the power transmission line defect detection model based on multi-image fusion of visible light, infrared light, ultraviolet light and the like is established, the defect recognition accuracy can be improved, and the inspection working efficiency and quality are improved.
Owner:SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI

Method for obtaining exterior orientation elements of aerial photograph

The invention relates to a method for obtaining exterior orientation elements of an aerial photograph. The method comprises the first step of performing ellipsoid correction and projection on a rotation matrix formed by first included angle data obtained in advance to obtain a rotation matrix formed by second included angle data, the second step of obtaining the second included angle data according to the rotation matrix formed by the second included angle data and using the second included angle data as three angle elements of the exterior orientation elements, the third step of obtaining first spatial offset, the fourth step of converting the first spatial offset to second spatial offset through the rotation matrix formed by the second included angle data, the fifth step of obtaining the coordinates of a GPS antenna phase center in a preset national ground survey coordinate system, and the sixth step of converting the coordinates of the GPS antenna phase center in the preset national ground survey coordinate system to the coordinates of a photographing center in the preset national ground survey coordinate system through the second spatial offset and using the coordinates of the photographing center in the preset national ground survey coordinate system as three line elements of the exterior orientation elements. The method is small in error and capable of obtaining the high-precision exterior orientation elements.
Owner:WUHAN UNMAP REMOTE SENSING TECH CO LTD
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