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

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.

The invention discloses a road survey and design method based on a high-resolution satellite image, which comprises the following steps: A, determining a scope to be covered by a satellite image according to a route scheme, selecting a high-resolution satellite and a sensor for collection, and designing and collecting three-dimensional images of the high-resolution satellite; B, when a scale of 1 to 2,000 is formed, laying and measuring field ground control points and laying control points along the route; C, generating a digital ground model, a digital orthophotomap and a digital line topographic map for the road route area through area adjustment of the three-dimensional images of the high-resolution satellite based on rational polynomial parameters of the images of the high-resolution satellite; and D, calculating engineering quantities and generating route design drawings and tables through measurement of the high-resolution satellite and collaborative design of the road CAD. The invention realizes the measurement of the high-resolution satellite and the collaborative design of the road CAD, thereby greatly reducing the field workload, shortening the survey and design period, and producing significant economic and social benefits.

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 provides a method for constructing a multi-level three-dimensional terrain model through multi-source data fusion. The method sequentially comprises the steps of image control point measurement and setting, unmanned aerial vehicle flight and data processing, three-dimensional laser scanning data acquisition and processing, terrain design and satellite terrain processing, multi-sourceimage data fusion, multi-source point cloud data fusion and multi-source DEM fusion. Finally, a three-dimensional terrain model is constructed, a single-source DOM + single-source DEM fusion mode, amulti-DOM + single-source DEM fusion mode and a multi-DOM + multi-DEM fusion mode are established, and a multi-level and multi-precision three-dimensional real terrain model is constructed. The problems that an existing three-dimensional terrain model is low in precision, single in obtaining mode, poor in expression effect, poor in construction guidance and the like are solved. The invention belongs to the field of constructional engineering.

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 relates to a method for measuring a gangue dump surface temperature field through close-range photogrammetry and a thermal infrared imager and belongs to the fields of non-contact measurement technologies and environmental monitoring technologies. The method comprises the steps of dividing a gangue dump into a plurality of shooting regions, each shotting region corresponds to one image of the thermal infrared imager, and arranging four mark points in each shooting region, wherein the mark points are required to be located in an overlapping region of every adjacent images; arranging a shooting base station for the close-range photogrammetr and arranging 4-6 control points in the gangue dump; building 1-2 mapping base control points; using the thermal infrared imager to shoot infrared images of the gangue dump surface temperature; and using a camera to shoot gangue dump surface videos and using a total-station instrument to obtain space coordinate information of the mapping base control points and the gangue dump surface control points. The images and the videos are spliced and coordinates are converted and overlaid to obtain a gangue dump surface temperature field image. The temperature information and the space coordinate information of any point on the gangue dump surface are obtained from the surface temperature field image.

The invention discloses a panoramic-image-based dangerous falling rock surveying method, which comprises the following steps of distributing control points, acquiring a panoramic image of a construction site, and calculating attitude parameters and unit sphere center positions of the panoramic image under an engineering coordinate system for panoramic image orientation by combining with real coordinates of each control point; establishing a measurable three-dimensional visual environment of the panoramic image to obtain a three-dimensional panoramic image with a geographic reference by combining with a digital elevation model of the construction sites; identifying dangerous falling rocks, and extracting the information of the dangerous falling rocks. According to the method, the panoramic image of an engineering construction area is acquired, and a digital three-dimensional dangerous falling rock interpretation environment is established under the support of a high-precision mathematical model, so that a dangerous falling rock remote-sensing interpretation method is improved, and the distribution range, scale, spatial form and position of the dangerous falling rocks are accurately and efficiently determined; the method is proven to be effective by the actual application of railway construction projects such as the coal transportation passage from Sanmenxia to Jingmen and the railway from Xinjiang Baluntai to Yiergen.

The invention discloses an audio magnetotelluric data noise interference filtering method and an audio magnetotelluric data noise interference filtering system, which relate to the technical field ofgeophysical exploration. According to the audio magnetotelluric data noise interference filtering method, a generalized morphological filtering method is adopted to filter data with low-frequency noise interference, the data with peak pulse noise interference is filtered by adopting a wavelet transform method, low-frequency noise interference can be filtered out, peak pulse noise interference canbe filtered out, and various noise interferences can be filtered out at the same time, thus high-quality original data are obtained, the working efficiency is improved, the field workload is reduced,and geological prospecting work can be better served.

The invention provides a lightweight method of a high-precision digital elevation model. According to the method, the DEM is subjected to lightweight processing twice, the data size of the point cloudmodel can be reduced to about 100 times by resampling the point cloud data for the first time, the digital surface model with relatively low data memory is obtained by multiple aerial triangulation calculation processes and model repair, and the topographic precision is not reduced; the second lightweight processing is realized by setting the interval of DEM resampling, the obtained DEM precisionis within 1m, and the defects that the existing DEM data redundancy and memory are large, the model surface is not smooth, the terrain precision is not high and the like are effectively overcome. Theinvention belongs to the field of constructional engineering.

The invention relates to a method for measuring forest soil NO2 emission. The method comprises the five following steps: firstly, selecting a sampling point; secondly, collecting a soil sample; thirdly, measuring the content of soil dissolved organic nitrogen (DON); fourthly, establishing a linear relation, wherein a linear relation function of forest soil NO2 emission amount and DON is: Y=0.0435X-0.1361; and fifthly, actually measuring the forest soil NO2 emission amount, wherein the content (mg.kg<-1>) of DON in the forest soil to be measured which is used as X is substituted to the function relation formula to solve for Y, i.e. the forest soil NO2 emission amount with the unit of mg.m<-2>.h<-1>. Compared with a static chamber method, the method is used for calculating the forest soil NO2 emission amount through measuring the DON, the field work load is reduced, the measuring cost is lowered, the batch quantity analysis can be carried out, the measuring work efficiency is improved, the obtained numerical error range is small, and the reliability is better.

The invention provides a toppled rock body classification method. The method comprises the steps of setting seven classification indexes for evaluating toppled rock bodies, wherein the classification indexes include a deformation feature, a rock stratum tilt angle, an inter-stratum maximum extensional amount, an inter-stratum unit extensional amount, an unloading deformation feature, a weathering degree and a longitudinal wave velocity; and according to comprehensive judgment of the classification indexes, classifying the toppled rock bodies into three types: an A-type extremely strong toppled cracking region, a B-type strong toppled cracking region and a C-type weak toppled transitional deformation region. According to the method, the classification indexes can pointedly describe basic deformation cracking features of the toppled rock bodies; the field workload is small; and in the aspect of evaluating the stability of the toppled deformed rock bodies, the effect of getting twofold results with half the effort can be achieved due to high pertinence.

An isolating device for seed production of hybrid rice. The invention relates to isolating methods for seed production of rice, particularly relates to an isolating device for the seed production of hybrid rice and belongs to the technical field of rice seed breeding. According to the adopted technical scheme, the isolating device comprises more than two steel-tube brackets (1), a groove (3) and waterproof cloth (2), wherein the groove (3) is formed in the steel-tube brackets, and the waterproof cloth (2) is embedded in the groove (3) through a hold-down strip (4); and the isolating device for seed production can be formed by the more than two waterproof cloth (2) embedded steel-tube brackets (1) through enclosing. The isolating device has the technical effects that the nylon cloth is tightly embedded in the steel-tube brackets by the hold-down strip, so that strongly windy weather can be withstood; and the steel-tube brackets can be disassembled and can be reused.

The invention discloses a moso bamboo forest number identification method and device based on a foundation laser radar. The method comprises the following steps: obtaining foundation laser radar point cloud data of a moso bamboo forest through the foundation laser radar; obtaining a point cloud data file according to the ground-based laser radar point cloud data; intercepting the point cloud data file according to a preset interception upper limit and an interception lower limit, and generating a section of horizontal strip only containing bamboo stalks; carrying out voxelization on the horizontal strip in a three-dimensional space to generate a voxel space, wherein the voxel space comprises voxels of the ground-based laser radar point cloud data; and taking the continuous voxel group in the vertical direction of the whole horizontal strip as a stem, and traversing the voxel space to obtain the number of the moso bamboo forest. By adopting the embodiment of the invention, not only can the field workload of sample plot investigation be reduced, but also according to the special morphological characteristics of the moso bamboos, the proposed new method can improve the identification rate of the single moso bamboos and provide reference for bamboo forest investigation.