50 results about "Z-Coordinate" patented technology

The invention relates to the technical field of line laser three-dimensional scanning, in particular to a reference coordinate system calibration method based on line laser three-dimensional scanning, which comprises the following steps of: calibrating camera parameters; calibrating a light plane equation of the laser; obtaining a calibration whiteboard image; establishing a reference coordinate system; and calculating a conversion matrix from the camera coordinate system to the reference coordinate system. The reference coordinate system of the line laser three-dimensional scanner can be determined only by additionally acquiring a white board image during calibration, and whether the current object is located in the measurement range or not can be determined according to the z coordinate value of the point cloud data by converting the acquired three-dimensional point cloud data of the measured object to the reference coordinate system. And the efficiency and the accuracy of subsequent point cloud processing and three-dimensional measurement are greatly improved. Therefore, the problem that an existing calibration method is low in measurement precision is solved.

According to the small-view-field precise three-dimensional reconstruction method provided by the invention, in a global calibration process, a calibration method based on a virtual plane is provided, the virtual plane is used for calibrating a spatial position relationship between a camera and a projector, a spatial line-line intersection algorithm is used for obtaining a three-dimensional coordinate under global calibration, and global parameters of an X coordinate and a Y coordinate are obtained; in the local calibration process, a coordinate correction method based on a PCA plane fitting ideal plane is provided, the mapping relation between the phase and the coordinate of each pixel level is constructed by using cross ratio invariance, the relation between the absolute phase of an image collected by a camera and the Z coordinate is obtained, and system local calibration parameters for the Z coordinate are obtained; in the three-dimensional reconstruction process, an image positioning method based on the difference reflectivity is provided, the reconstruction range is narrowed, and only the image in the reconstruction area is calculated in subsequent calculation; and an invalid phase value identification and removal method is provided, interference of invalid points is eliminated, and the accuracy of a reconstruction result is ensured.

The invention relates to a design method of a steel structure hyperbolic cooling tower, which comprises the following steps of: drawing concentric circles based on the bottom radius, the top radius and the throat radius of the cooling tower, taking one point on each circle, enabling three points to be collinear, enabling a connecting line of the points on two large circles to be tangent to a smaller circle, and drawing a plane geometry relation graph by taking the circle center of the concentric circles as an original point of a coordinate system; an equation set is listed according to a plane geometrical relation graph, coordinates of points on two large circles can be obtained by solving the equation set, namely, bus and endpoint coordinates and reverse bus and endpoint coordinates of the cooling tower can be obtained, n arrays are made by the reverse buses and the bus around the central axis of the cooling tower, m intersection points are formed by a set after the reverse buses are arrayed and the bus, and m intersection points are formed by the intersection points and the bus. The number of layers of the cooling tower is m-1, and the difference of Z-direction coordinates of adjacent intersection points is the layer height of each layer of the cooling tower; the set behind the bus array and the set behind the reverse bus array form n intersection points at the elevation of each layer, and the intersection points of the two sets of each layer are connected in sequence to form a closed state.

The invention discloses a Z-MAP method-based longitudinal-torsional ultrasonic milling surface topography modeling and surface roughness prediction method and system, a terminal and a storage medium, and the method comprises the steps: determining a machining method, geometric features of a cutter, cutting parameters and ultrasonic vibration parameters, and measuring the axial run-out and radial run-out of the cutter in the machining process; discretizing a workpiece, a cutter and time to obtain a cutter movement track of each stage; dividing the workpiece into u parts and v parts along an x axis and a y axis; comparing the Z coordinate at each moment with the Z coordinate of the workpiece point, if the former is smaller than the latter, indicating that the cutting edge infinitesimal at the current moment has a cutting effect on the workpiece, and updating the Z coordinate of the workpiece, and if the former is not smaller than the latter, indicating that the cutting edge infinitesimal at the current moment has no interference on the workpiece, and keeping the Z coordinate of the workpiece unchanged; and the whole simulation machining process is completed. According to the method, the surface topography and the surface roughness of different machining processes are predicted.

The invention discloses a method for automatically measuring the center position of a five-axis rotary table cradle, and relates to the technical field of five-axis machining tools. The method comprises the following steps: S1, placing a standard ball at a preset position of a five-axis turntable, and enabling a probe to contact and obtain a contact point coordinate; s2, fitting by using a least square method to obtain a sphere center coordinate and a radius; s3, controlling the C shaft to rotate, changing the position of the standard ball, obtaining the contact point again and determining the position of the standard ball; s4, rotating the standard ball to a second position, calculating the center coordinate of the ball, and estimating the center X and Y coordinates of the rotary table; s5, accurately measuring a plurality of sphere center coordinates, and calculating X and Y coordinates and a deviation angle of the center of the rotary table; and S6, controlling the A axis to rotate, calculating a Z coordinate, and finally obtaining a three-dimensional coordinate of the center of the rotary table. Through automatic accurate measurement and optimization calculation, the three-dimensional coordinates of the rotary table can be efficiently and accurately determined, and stable positioning and high consistency in a complex working environment are ensured.

The invention discloses a real-time extraction method and system for a mine roadway wall, and relates to unmanned driving. The method comprises the steps that three-dimensional point cloud data of a roadway environment is collected through a vehicle-mounted multi-laser radar; converting the point cloud data under each laser radar coordinate system into a vehicle body coordinate system; projecting the point cloud data set to a two-dimensional grid taking an x-y plane of a vehicle body coordinate system as a reference, calculating a difference between a maximum value and a minimum value of z coordinates of all point clouds in each grid, taking the difference as an elevation difference value of the corresponding grid, and generating a two-dimensional elevation gradient map; taking the elevation gradient map as input, performing feature extraction by using a pre-trained U-Net variant convolutional neural network, and performing dichotomy on each pixel by using a softmax classifier; and performing curve fitting on the divided roadway wall boundary points, calculating a curvature value, selecting a corresponding fitting model according to the curvature value, and outputting a roadway wall boundary line. The method does not need to depend on any pre-constructed map, converts the three-dimensional point cloud projection into a bird's-eye view elevation gradient map, and captures the geometric mutation characteristics of the roadway wall.

At least part of the three-dimensional trajectory of the turn portion is formed on the basis of a cross-sectional trajectory curve in an X-Z cross section of the motion guide apparatus, and a longitudinal trajectory curve drawn on a virtual plane VP where a longitudinal direction of the motion guide apparatus is a Y-axis, and a trajectory length ω from a turn start point A of the cross-sectional trajectory curve is a length ω of a W-axis. X and Z coordinates of the threedimensional trajectory are X and Z coordinates of the crosssectional trajectory curve. A Y-coordinate of the threedimensional trajectory is a Y-coordinate of the longitudinal trajectory curve where the ω of the W-axis of the virtual plane VP is a variable.

The invention relates to the technical field of three-dimensional data processing and analysis, in particular to a method and a system for constructing a local reference system of a three-dimensional surface. The method comprises the following steps: selecting a local surface of a key point p of a three-dimensional surface, and dividing the local surface into an inner circle and an outer ring according to a radius R1 and a radius R2; solving stable vectors LSA of all vertexes of the inner circle and the outer ring; taking the average direction of the stable vectors LSA of all vertexes of the inner circle part as a Z coordinate axis; performing weighted projection on the stable vectors LSA of all the vertexes of the outer ring part to a tangent plane defined by a Z coordinate axis and a p point; establishing a direction histogram, carrying out statistics on direction information of projection vectors, and selecting an angle with the maximum voting value as the direction of an X coordinate axis; and taking the cross multiplication direction of the Z coordinate axis and the X coordinate axis as the direction of the Y coordinate axis. The method has better robustness for incomplete point clouds with resolution change and noise interference.

The application provides a 3DEXP platform modeling method based on a two-dimensional arrangement drawing of a relief valve. The technical scheme comprises the following steps: firstly, analyzing information requirements of a relief valve model arrangement of a 3DEXP platform, and setting a relief valve equipment model library in the 3DEXP according to a relief valve standard; then, reading relief valve positioning information from a two-dimensional arrangement drawing, the two-dimensional arrangement drawing of the relief valve containing complete coordinate axis information of the whole ship, and based on this, performing two-dimensional arrangement of the relief valve to read out XY coordinate values of the relief valve; then, in the case of determining two coordinate parameters, establishing vertical lines based on the XY coordinate values of the relief valve in the 3DEXP platform to determine Z coordinate values; finally, setting a separate coordinate axis for each relief valve, and taking intersection lines of YZ and XZ planes of the coordinate axis and an outer plate as a basis for inclination of the relief valve, thereby completing model arrangement of the relief valve after twice inclination rotation of the relief valve, and realizing arrangement of the relief valve adhering to the outer plate.

The invention discloses a GIS equipment laser three-dimensional point cloud data denoising method, and relates to the field of data denoising, and the method comprises the steps: S1, obtaining, processing and analyzing GIS equipment laser three-dimensional point cloud data, the GIS point cloud data comprising X, Y and Z coordinate information of a Cartesian coordinate system of a three-dimensional object on a sampling curved surface and the sampling curved surface of the three-dimensional object; s2, constructing a de-noising mapping model, wherein the de-noising mapping model comprises a local region feature de-noising layer and an overlapping region feature de-noising layer; and S3, substituting the GIS equipment laser three-dimensional point cloud data into the denoising mapping model to obtain a target denoising point cloud and generate a three-dimensional image. According to the GIS equipment laser three-dimensional point cloud data denoising method provided by the invention, data of irrelevant equipment can be more accurately removed and subjected to noise reduction processing, and the complexity in the operation process is reduced.

The invention belongs to the technical field of mine intellectualization, and provides a rapid construction method for a three-dimensional model of a mine roadway based on a CAD drawing in order to solve the problems of long modeling time and the like of traditional three-dimensional modeling of the mine roadway. Information is obtained by reading a mine roadway center line layer and a contour line layer, and the elevation value of each node is calculated; inserting a plurality of additional points between adjacent points to obtain a refined three-dimensional scatter grid in order to accurately measure the actual elevation of the underground roadway; and a z coordinate of each node of the roadway is obtained by using a cubic interpolation Bessel polynomial for interpolation, so that a three-dimensional coordinate of the roadway is obtained. According to the invention, the tedious process of manually drawing the roadway by using modeling software can be avoided, and the purposes of improving the modeling speed and precision and reducing the modeling workload are achieved.

The application relates to the technical field of optical processing, in particular to a magnetorheological polishing multi-surface common element integrated processing method, which comprises the following steps: S1, decomposing a known actual grating track into a row coordinate according to a longitudinal coordinate mutation point; S2, splitting each row track into a main mirror first track segment, a slave mirror track segment and a main mirror second track segment according to a transition point circle diameter; S3, determining a transition point extension length according to a magnetorheological equipment removal function length; S4-S5, respectively extending the main mirror track segment and the slave mirror track segment and inserting new points; S6, obtaining three-dimensional coordinates by calculating z coordinates of each segment by using a corresponding surface equation; S7, splicing to generate a single-row ordered point sequence; and S8, combining all row tracks and rotating an angle to obtain a final track. θ Through the above scheme, the problems that multi-surface common element segmented processing has long redundant time, low efficiency, and the transition area joint is not accurately processed, the transition area of the optical element has a large range of edge, the effective aperture is reduced, and the imaging quality of the optical system is affected are solved.

The utility model discloses a universal clamp for five-axis machining precision verification. The universal clamp comprises a part blank, a conversion circular plate, a first positioning pin, a second positioning pin, a third positioning pin, a pressing plate, a pressing plate supporting column and a locking bolt. A threaded hole, a supporting column fixing hole, a first pin hole, a second pin hole, a third pin hole and a mounting hole are formed in the front face of the conversion circular plate. When the fixture is used, the conversion circular plate is connected with a working table of a machine tool, then the three positioning pins are inserted, so that the X coordinate axis, the Y coordinate axis and the Z coordinate axis of a part blank are limited, then the four pressing plates are used for pressing the part blank, and fixing of the part blank is completed. The device is low in cost, convenient to install, free of interference in machining and suitable for test pieces of various sizes, and meanwhile the positions of the three positioning pins and the four pressing plates can be moved to adapt to the test pieces of different specifications.

The present invention relates to the field of intelligent surveying and mapping technology, and proposes a three-dimensional reconstruction method and system for submarine shallow stratum topography, which includes the following steps: obtaining the original data measured in the field by multiple sensors, and performing format conversion on the original data; the original data includes GPS data collected by a GNSS locator and shallow profile waveform data collected by a shallow profiler; performing preprocessing on the original data after format conversion in a two-dimensional view; performing three-dimensional reconstruction of a point cloud model according to the preprocessed original data, wherein the northing coordinate of the projection coordinate of the GPS data is used as the X coordinate, the easting coordinate of the projection coordinate of the GPS data is used as the Y coordinate, and the depth information of the shallow profile waveform data is used as the Z coordinate for three-dimensional reconstruction of the point cloud model, and then visualizing the point cloud model. The present invention can intuitively observe the three-dimensional geological conditions of the shallow stratum, which is beneficial to the marine shallow geology and marine engineering survey work.

The present invention is a high-precision optical positioning system for a wind tunnel balance. The present invention relates to the technical field of optical positioning for static calibration of a wind tunnel balance. The system of the present invention comprises: a support system, a sliding system, a measuring system, a balance system and a host computer; the support system is used to support the sliding system and the measuring system, and the sliding system supports the translational displacement of the measuring system in the X and Z coordinate directions, so that the measuring system and the balance system maintain an ideal measuring distance, and the measuring system measures the real-time position change of the balance system to achieve measurement of tiny deformations during the calibration of the balance. The high-precision optical positioning system for a wind tunnel balance of the present invention realizes controllable adjustment of multiple degrees of freedom, realizes the precise measurement of the laser displacement meter to the greatest extent, guides the reset system to perform precise posture control, and realizes static calibration of the high-precision body axis system of the balance, which is beneficial to improving the calibration precision and accuracy of the balance.

The invention discloses a numerical control machine tool precision state evaluation method, system and device and a medium, and relates to the field of numerical control machine tool precision evaluation, and the method comprises the steps: installing a plurality of measurement blocks at a plurality of preset positions of a numerical control machine tool workbench; determining coordinate data of each measurement block along X, Y and Z coordinate axis directions to form a plurality of groups of measurement data; and determining the positioning errors of the X, Y and Z coordinate axes, the straightness deviations of the X, Y and Z coordinate axes and the perpendicularity deviations of the X, Y and Z coordinate axes based on a plurality of preset positions and a plurality of groups of measurement data. The objective of the invention is to solve the problems of high cost, long time consumption and incapability of efficient and integrated measurement of key geometric precision measurement of a traditional method in precision detection of a numerical control machine tool.

A valve opening / closing system disclosed herein comprises: a pin that extends in a Z-axis direction and acts on a valve of a flow path device; a sliding plate that has a range of motion in an X-axis direction and has irregularities on the surface in the positive Z-axis direction; a first spring that connects a pin head and a pin lower portion (base portion); a pin guide that has a through-hole; and a second spring that connects the pin guide and the pin lower portion. The valve is opened and closed by moving the pin in the Z-axis direction by moving the sliding plate in the X-axis direction by means of a control unit. Here, it is important that the pin head not be in contact with the valve (made of a plastically deforming film) when the valve is opened. When this is expressed as a conditional expression, the relations Z0≦Z1<Z2 and Zn≦Z1 hold, where the Z coordinate of the Z-axis minus end of the pin is Zp, the Z coordinates of a concave portion and a convex portion of the sliding plate are Z0 and Z2, respectively, the minimum Zp at which the first spring elastically deforms is Z1, and the Zp at which the second spring elastically deforms is Zn (see FIG. 7).

The object detection device is configured to perform road surface detection processing, object parallax determination processing, and object detection processing. The road surface detection processing estimates the position of the road surface based on a first parallax map. The first parallax map is generated based on the output of a stereo camera, and the parallax is associated with a two-dimensional coordinate consisting of a first direction and a second direction intersecting the first direction, wherein the first direction corresponds to the horizontal direction of the image captured by the stereo camera. In the object parallax determination processing, if the number of occurrences of the parallax in each coordinate range in the first direction of the first parallax map exceeds a predetermined threshold corresponding to the parallax, the parallax is determined to be the object parallax. In the object detection processing, the object parallax information is transformed into a point group in the x-z coordinate space, and the object is detected by extracting a set of the point groups.

The application discloses a workpiece welding slag detection method and system based on a 3D line scanning camera, and comprises the following steps: S1, a single frame point cloud of a workpiece is acquired; S2, a straight line is extracted for the single frame point cloud, the distance of each point on the point cloud to the straight line is calculated, and is compared with a preset distance threshold value; if the distance is less than the preset distance threshold value, the corresponding point cloud is filtered out, and the z coordinate z_l of the projection point of each point on the straight line is calculated; if the z coordinate of the point is less than the z coordinate z_l of the projection point, the point is filtered out; S3, the retained point cloud is spliced into a total point cloud, the point cloud groups in the total point cloud are segmented, the span distances of the point cloud groups in different directions are calculated, and the span distances in different directions are compared with a preset span distance threshold value; if the span distance is greater than the preset span distance threshold value, the corresponding point cloud group is filtered, and the workpiece welding slag is obtained. The application has the advantages of high detection efficiency, accurate and comprehensive detection, etc.

The invention discloses a micro-vibration evaluation method, system and device considering time weighting, and a storage medium. The method comprises the following steps: preprocessing original micro-vibration data; setting the length of the analysis blocks and the overlapping ratio between the adjacent analysis blocks; carrying out block processing on the whole data, and if data less than one analysis block exists at last, abandoning the processing; calculating the duration of each analysis block, and taking the central moment of the analysis block as the representative moment of the analysis block; performing fast Fourier transform on all the analysis blocks, adding window function operation and multiplying by an energy recovery coefficient; effective values of all the analysis blocks at all the center frequencies are calculated; and drawing a time-center frequency-micro-vibration grade color cloud picture by taking time as an X coordinate, the center frequency as a Y coordinate and the velocity spectrum effective value as a Z coordinate. According to the method, the evaluation dimensions are more, the expression information is more complete, and the change rule of the speed effective value of each center frequency at different center frequencies and along with the time change of the micro-vibration can be displayed at the same time.

The invention relates to a large array composite pipe turn-over clamping pose error measurement and compensation device and method.The device comprises a probe, a feature point carrier and an internal expansion device, the feature point carrier comprises a device body, the device body is provided with an upper end face and a lower end face, and an inner hole is formed in the device body; the reference features are installed in the composite pipe through an internal expansion device, coordinates of the central axis of the inner hole wall and coordinates of projection of the hole axis on the upper end face are detected through a probe, coordinate data of front feature points under a machine tool coordinate system are obtained, and the coordinates of the central axis of the inner hole wall are x and y coordinates of the feature points; the z coordinate difference of the upper and lower end faces is used for realizing z coordinate detection of the first face and the same reference point after the face is turned over. According to the invention, an accurate reference is provided for double-sided processing of the array composite pipe, the error of the blank is prevented from being fused into the positioning reference, the six-axis positioning deviation of the station relative to the station of the first surface can be measured before the second surface of the array composite pipe is processed, and the relative profile tolerance of the double surfaces after processing is improved.

The invention belongs to the technical field of mold manufacturing, and discloses a method for determining the spatial position of a machining plane. Comprising the following steps: establishing an X / Y / Z coordinate system by taking a geometric center of a processing area in a design processing plane as an original point of the coordinate system, making a normal vector line of the design processing plane through the original point and projecting the normal vector line on an XY plane, measuring an included angle between the normal vector line and a Z axis and an included angle between a projection line and an X axis, and rounding respectively, and a normal vector line of the actual machining plane is limited and restored according to the rounded angle, and a plane perpendicular to the normal vector line and passing through the original point is the actual machining plane. According to the method, various auxiliary lines can be automatically made by utilizing drawing software, angles are automatically decomposed, angle values are measured and output, and new machinable planes are automatically rounded and output according to the measured values, so that mold design data are easy to backtrack, machining quality reinspection is facilitated, the tedious degree of later modification is reduced, the design time is shortened, and the production efficiency is improved. The die is suitable for manufacturing various dies with inclined machining planes.

A request to add an overlay at a pixel located at (x, y) coordinates in images is received. Waypoints in a three-dimensional space are identified with respective two-dimensional projections onto the images falling inside a circle with a given radius r and centered at (x, y). An overlay z-coordinate is determined for the overlay as a weighted sum of respective z coordinates of the waypoints. The overlay is assigned a location (x, y, overlay z-coordinate).

A motion guide apparatus is provided in which even if at least part of a turn portion is a three-dimensional trajectory that is three-dimensional and complex, it is possible to approach at least one of a rolling path and a return portion substantially along a tangent line. At least part of the three-dimensional trajectory of the turn portion is formed on the basis of a cross-sectional trajectory curve (14) in an X-Z cross section of the motion guide apparatus, and a longitudinal trajectory curve (15) drawn on a virtual plane VP where a longitudinal direction of the motion guide apparatus is a Y-axis, and a trajectory length ω from a turn start point A of the cross-sectional trajectory curve (14) is a length ω of a W-axis. X and Z coordinates of the three-dimensional trajectory are X and Z coordinates of the cross-sectional trajectory curve (14). A Y-coordinate of the three-dimensional trajectory is a Y-coordinate of the longitudinal trajectory curve (15) where the ω of the W-axis of the virtual plane VP is a variable.

The present invention relates to the field of electronic technology applications, and discloses a container intelligent crossing inspection system and method. The container intelligent crossing inspection system includes: an image acquisition module for obtaining images of three sides of the container. A type acquisition module is used to obtain the container type. A travel sensor is used to obtain the x-axis coordinate of the container. A distance sensor is used to obtain the y and z coordinates of the container. An image stitching module is used to obtain the overall container surface map. A spatial construction module is used to form a three-dimensional container map and the three-dimensional coordinates of the container. A component classification module is used to obtain the component name, three-dimensional coordinates and send an abnormal signal. An outlier determination module is used to obtain the defect type. A microscopic camera is used to obtain the defect size and defect characteristics. A repair determination module is used to obtain repair measures. By constructing a coordinate system to locate each component of the container and comparing them through an exposure model, defects are accurately acquired and determined with high accuracy.

Provided is a small-sized scanning stage for scanning a device on the surface of a scan target having a large diameter.　A scanning stage 10 comprises: an X-Y stage (21); a device (17) that is fixed to an X-Y-Z coordinate system common to the X-Y stage (21); a rotating stage (22) provided on the X-Y stage (21) and holding and rotating a scan target (15); a first drive unit (11) that drives the X-Y stage (21) so that an input / output axis (18) of the device (17) scans a scan region (R) which is one region that is set from among a plurality of regions (A, B, C, D) into which the scan target (15) is equally divided with respect to a rotation center O of the rotating stage (22); and a second drive unit (12) that drives the rotating stage (22) so that a region (A, B, C, D) yet to be scanned is positioned in the scan region (R).

The invention is suitable for the technical field of slip surface inversion, and provides a slip surface geometric inversion method coupling InSAR deformation data and numerical simulation, and the method comprises the steps: obtaining SAR image data, DEM data and drilling data of a landslide region; constructing a two-dimensional geologic model of the landslide area in three-dimensional simulation software based on the DEM data and the drilling data; optimizing the z coordinate vector by using a particle swarm optimization algorithm to obtain an optimal z coordinate vector which has a minimum fitness function and meets a preset spatial constraint; and constructing a sliding surface curve based on the optimal z coordinate vector. According to the invention, the efficiency and objectivity of sliding surface inversion can be improved.

The invention provides a three-dimensional velocity model time-depth conversion method and device and a medium, and belongs to the field of geophysical exploration. The method comprises the following steps: step 100, inputting original velocity volume data and carrying out preprocessing; step 200, generating a three-dimensional velocity model; step 300, calculating travel time by a rapid travel method; step 400, calculating coordinate mapping by a windward finite difference method; and step 500, outputting travel time and a coordinate mapping result. According to the method, the velocity model is constructed, the seismic wave propagation travel time of each grid point is calculated by using the fast marching method, and the X, Y and Z coordinates of each measurement point on the seismic wave propagation path are further calculated by using the windward finite difference method, so that the calculation accuracy and efficiency of the seismic wave propagation path are improved; the method is suitable for seismic wave propagation simulation in a complex stratum environment, and provides reliable data support for geophysical exploration.

The present invention provides a method and system for measuring the tower height of the end face of a hot-rolled steel coil based on 3D point cloud, which can solve the problem that quality inspection personnel cannot enter the site to accurately measure the tower coil height when the temperature of the hot-rolled coil is too high. The method includes: Step 1, obtaining the point cloud image of the end face of the steel coil; Step 2, segmenting the point cloud image region; Step 3, respectively segmenting the point cloud images of the bottom and top of the tower of the end face of the steel coil by using the Euclidean distance between each point cloud coordinate, calculating the number of point clouds in the segmented multiple regions and arranging them in ascending order, and preliminarily positioning the image regions of the bottom and top of the tower; Step 4, setting the tower height measurement error value, calculating the mean value of the z coordinate values of all the point clouds in the preliminarily obtained image regions of the bottom and top of the tower, intercepting the set region near the mean value, and accurately positioning the bottom and top regions of the tower; Step 5, calculating the tower height.