14 results about "Topographic profile" patented technology

This invention discloses a method for registering forest point clouds from UAV-LiDAR during leafy and leafless periods, relating to photogrammetry, remote sensing mapping, and forest resource monitoring. The method extracts ground points from two phases of UAV-LiDAR point clouds, constructs multi-directional radial topographic profiles, and extracts local profile segments using a sliding window. It calculates a comprehensive similarity based on trend consistency, robustness to local shape deformation, and curvature similarity, and selects stable matching segments by combining radial distance and topographic undulation amplitude consistency constraints. Three-dimensional corresponding point pairs are generated from the matching segments, and the initial rigid body transformation is solved using SVD. The registration is then optimized using ICP to obtain a multi-temporal fused point cloud. This invention can achieve reliable registration under conditions of phenological differences, missing vegetation structure, and initial biases, providing support for the reconstruction of three-dimensional forest structures and refined resource monitoring.

The invention discloses an intertidal zone terrain profile extraction method based on time-average video images. The method comprises the following steps: acquiring an intertidal zone continuous video image, and correcting the intertidal zone continuous video image to a plane geographic coordinate system through a coordinate conversion model; establishing single-valued mapping between ground coordinates and image plane coordinates, and back-projecting pixels of the video image to a unified geographic grid; constructing an affine matrix of a single-pixel image column based on single-valued mapping, and embedding a geographic direction vector of a target section into spatial transformation of the image column; intercepting an image column sample of the image at each moment in the video image according to a preset pixel width along the target section direction; identifying the position of a waterline breakpoint in the image column by using a neural network model; and carrying out waterline elevation calculation and the like by referring to a local slope model based on a balanced section. According to the method, the high-frequency characteristics of video monitoring and the priori knowledge of the physical model are fused, so that the efficiency and precision of profile extraction are effectively improved while the data continuity is ensured.

The invention discloses a near-surface geological section generation method and device, and the method comprises the steps: extracting a stratum boundary line and stratum occurrence vector point data of a target near-surface geological region based on a satellite remote sensing image and a digital elevation model; elevation information is obtained from the digital elevation model data, and a topographic profile contour line containing a topographic relief curve and a downward extension copy line thereof is generated; carrying out space intersection on the topographic profile contour line and the stratum boundary line to generate an extension stratum node under the contour line; matching corresponding stratum occurrence vector point data for the extended stratum nodes; calculating the downward extension direction of the stratum according to the inclination angle and the inclination angle in the matched stratum occurrence vector point data, and generating a target near-surface stratum unit; and automatically filling geologic symbols and colors according to the name of the target near-surface stratigraphic unit, and drawing the geological profile of the target near-surface geological area according to a preset proportion. The method is used for improving the drawing precision and drawing efficiency of the near-surface address profile.

This disclosure proposes a method, apparatus, electronic device, and storage medium for determining saddle regions. The method includes: acquiring a digital elevation model of a geographic region, wherein the digital elevation model includes multiple initial grids; determining N*N initial grids as target grid regions, with each initial grid as a center grid, where N is an odd number greater than 1; determining four initial topographic profile lines along four axes of symmetry of the target grid regions; determining the curve parameters of each initial topographic profile line, wherein the curve parameters are used to describe the slope change of the initial topographic profile line when passing through the center grid; and determining whether the local geographic region corresponding to the initial grid is a saddle region based on the curve parameters of each initial topographic profile line. Thus, it is possible to accurately determine whether a geographic region is a saddle region, effectively improving the determination effect of saddle regions.

1. Name of the product in this design: Graphical User Interface for Topographic Profile Analysis of Electronic Equipment. 2. Purpose of this design: An electronic device. 3. The key design feature of this product is its graphical user interface. 4. Images or photos that best illustrate the design points: Interface change state diagram 5. 5. Purpose of the graphical user interface: The graphical user interface of this product is used by users to select a profile area within the target area, perform profile analysis on the geomorphological features of the target area, and obtain geospatial data. 6. Human-computer interaction method of graphical user interface: The main view is the main interface for users to enter the geomorphological feature profile analysis; clicking the button to the right of "Select Analysis Location" in the upper left corner of the main view will jump to the interface change state diagram 1; clicking a location in the geomorphological map of interface change state diagram 1 will jump to the interface change state diagram 2; dragging the cursor in the geomorphological map of interface change state diagram 2 will jump to the interface change state diagram 3; double-clicking a location in the geomorphological map of interface change state diagram 3 will jump to the interface change state diagram 4; hovering the cursor over a location in the data analysis chart at the bottom of interface change state diagram 4 will jump to the interface change state diagram 5. 7. Other situations requiring explanation: The gray-covered areas in the interface are content screens and are not within the scope of protection of this design; the usage status of the main view can be referred to the main view reference diagram, and the usage status of interface change state diagrams 1 to 5 can be referred to the interface change state reference diagrams 1 to 5 in sequence.

The application provides a low-orbit satellite communication shielding prediction method and system, and relates to the technical field of low-orbit satellite communication.The method comprises the following steps: acquiring a future trajectory sequence of a low-orbit satellite and a future trajectory sequence of a ground terminal, and topographic data and meteorological data of a region covered by the low-orbit satellite; generating a communication link space-time trajectory according to the future trajectory sequence of the low-orbit satellite and the future trajectory sequence of the ground terminal; performing space-time binding on the topographic data and the meteorological data to generate a space-time correlation matrix; determining the sampling point distribution and the sampling step of the topographic profile of the region covered according to the space-time correlation matrix, and combining an atmospheric refraction correction model and a meteorological attenuation model to perform dynamic shielding prediction, so as to obtain a shielding prediction result of the low-orbit satellite in a preset future time period.The application significantly improves the accuracy and timeliness of low-orbit satellite communication shielding prediction through multi-source data fusion, dynamic space-time trajectory generation, space-time binding, adaptive sampling and a comprehensive attenuation model.

The application provides an ice-water accumulation body bank collapse prediction method based on the limit equilibrium method, relates to the technical field of reservoir safety, and obtains a complete topographic profile by topographic surveying on an ice-water accumulation body slope, constructs an MP model in combination with the mechanical parameters of the ice-water accumulation body slope, analyzes the stability of the ice-water accumulation body slope in the MP model by the limit equilibrium method, obtains an analysis result, and if the part with the stability less than 1 in the analysis result is located on water, the part with the stability less than 1 located on water is accumulated under water according to the underwater stability slope angle, bank collapse is simulated, a new topographic profile is obtained, the MP model is reconstructed, iteration is carried out, until the ice-water accumulation body slope cannot collapse, the overall width of the part with the stability less than 1 located on water is counted as the predicted bank collapse width, the problem that the existing ice-water accumulation body bank collapse prediction error is large is solved, and the application is suitable for ice-water accumulation body bank collapse prediction.

The invention belongs to the technical field of marine surveying and mapping, discloses an airborne LiDAR sounding point cloud filtering method and system for shallow sea reef terrain, and aims to solve the problems that a coastal zone reef beach area is large in topographic relief and complex in water environment, and excessive filtering and residual noise points are prone to occurring in a traditional filtering algorithm. The invention provides a multi-stage and multi-feature constraint filtering method and a multi-stage and multi-feature constraint filtering system. Accurate identification and elimination of sea surface point clouds are realized based on DBSCAN clustering of echo intensity and point cloud density constraint and triangulation network broken line segmentation; secondly, a robust statistical model containing spatial distance, normal consistency, plane residual error and curvature characteristics is utilized, and a Mahalanobis distance is combined to optimize an SOR filter, so that discrete noisy points of a water body are effectively removed; and finally, performing direction slicing and curve fitting on the reef terrain point cloud by adopting a progressive profile analysis method to realize terrain contour correction and detail recovery. According to the method, the phenomena of wrong filtering and filtering leakage can be remarkably reduced in a complex shallow sea environment, and the integrity and continuity of terrain point cloud are improved.

The application discloses a kind of hydropower engineering topographic map expression method, belong to topographic map measurement and expression technical field, this method includes S1, obtains and contains schematic symbol using traditional surveying and mapping method generation digital topographic map;S2, the complex region corresponding to schematic symbol is scanned three-dimensionally, and the three-dimensional point cloud data obtained;S3, to three-dimensional point cloud data filtering processing, extract the real surface topographic data of complex region;S4, real surface topographic data is embedded in the position of schematic symbol in digital topographic map, forms fusion digital topographic map;S5, based on real surface topographic data in fusion digital topographic map, generates topographic profile information for geological analysis or engineering design.The application fills the region of schematic symbol in traditional topographic map as the region filled by real surface point cloud data after three-dimensional scanning and filtering processing, realizes the quantifiable, calculable expression of complex region topography such as precipice, abruptness, cliff etc.

Methods and systems for generating an optimal grading design are disclosed. The method performed by the system includes generating a topography profile of a plot of land. The method includes appending a plurality of boundaries to the topology profile. The method includes determining whether a grading design satisfies usage constraints based, at least in part, on the topography profile and a usage map. Herein, the usage map includes a plurality of usage areas and corresponding usage parameters. The method includes accessing a cost profile including a plurality of individual costs associated with respective land restructuring operations of the plot of land. The method includes generating a modified topography profile based on the topography profile and the cost profile associated with the respective land restructuring operations of the plot of land.

A method for identifying edges of curbs in an environment of a mobile platform. The method includes: providing at least one optical image of the environment of the mobile platform; determining linear structures in the at least one optical image; providing a topographic profile of a ground surface of the environment of the mobile platform; projecting the linear structures into the topographic profile of the ground surface; verifying the edges of curbs by examining, on both sides of the projected linear structures, the topographic profile for altitude jumps corresponding to a curb structure; connecting the verified altitude jumps in order to identify the edges of the curbs.

An optical interferometry system and associated methods are provided for interferometric measurement of topography of a sample region having a first direction in which a topographic metric is relatively uniform compared with an orthogonal direction of higher variation. A sensor having a two-dimensional array of pixels receives radiation including interference between reflections from the sample and from a tilted reference mirror. The tilt introduces, at the sensor, a gradient direction of the optical path difference (OPD), such that lines of pixels along the gradient direction correspond to positions of the sample region aligned in the direction of relative constancy. From a single captured image, an interferogram of OPD versus intensity is generated for each such line of pixels. A processor then calculates, from the interferogram, the corresponding topographic metric, providing a topographic profile of the sample region without scanning motion of the mirror or sample.

The invention relates to the technical field of image processing, in particular to a territorial geographic information surveying and mapping method and system. The method comprises the following steps: carrying out remote sensing image acquisition processing and image preprocessing on a territorial geographic information to-be-surveyed area to obtain a remote sensing standard image of the territorial geographic information to-be-surveyed area; performing image spectral analysis and spectral band area division analysis on the remote sensing standard image of the land geographic information area to be detected to obtain an image of a land water body area to be detected and an image of a land vegetation area to be detected; performing terrain contour feature point cloud analysis and three-dimensional space model reconstruction on the land water body to-be-measured area image and the land vegetation to-be-measured area image to generate a land to-be-measured area ground feature three-dimensional reconstruction space model; and performing terrain contour superposition correction and visual surveying and mapping processing on the terrain three-dimensional reconstruction space model of the land to-be-measured area to generate a land geographic information visual surveying and mapping topographic map. According to the invention, accurate surveying and mapping and image analysis of geographic information can be realized.

Methods and systems for generating an optimal grading design are disclosed. The method performed by the system includes generating a topography profile of a plot of land. The method includes appending a plurality of boundaries to the topology profile. The method includes determining whether a grading design satisfies usage constraints based, at least in part, on the topography profile and a usage map. Herein, the usage map includes a plurality of usage areas and corresponding usage parameters. The method includes accessing a cost profile including a plurality of individual costs associated with respective land restructuring operations of the plot of land. The method includes generating a modified topography profile based on the topography profile and the cost profile associated with the respective land restructuring operations of the plot of land.