40 results about "Scale (map)" patented technology

The invention discloses a high-ice-condition avoidance path planning method considering motion characteristics of a ship in an ice region, and relates to the technical field of safe navigation of ships, and the method comprises the steps: constructing a coarse-scale grid map and a fine-scale grid map, and determining a high-ice-condition grid; determining an initial navigation path by using a global path planning algorithm based on the coarse scale grid map; determining an external exciting force and substituting the external exciting force into the three-degree-of-freedom manipulation motion equation to solve motion state parameters; based on the fine-scale grid map and the motion state parameters, taking each global path point of the initial navigation path as a sub-target point, generating a plurality of local paths, and combining the local paths to obtain candidate navigation paths; and repeatedly executing the step of generating the initial navigation path and the candidate navigation path until the candidate navigation path meets the navigation requirement, thereby obtaining an optimal navigation path. According to the method, global direction control and local motion capability analysis are both considered, and the accuracy and reliability of the optimal navigation path obtained through planning are effectively improved.

The invention discloses a method for monitoring same-scale time sequence deformation information of a complex deformation body under a multi-source earth observation technology fusion background. The same-scale deformation information is accurately extracted from the multi-source observation data based on the multi-scale and multi-dimensional deformation characteristics of a complex deformation body, and the method has important application value for building safety operation, smart city construction, geological disaster monitoring and early warning and the like. According to the method, a high-resolution earth observation system and a single Beidou navigation positioning system in China are taken as main surveying and mapping technical means, and an intelligent extraction method for same-scale time sequence deformation of massive, complex-scale and multi-dimensional monitoring data is established according to an Msplit classification estimation theory, a time sequence model and a median function.

The invention discloses a structured corpus generation method and device for geological map multi-modal large model training, and the method comprises the steps: preprocessing geological vector data, and constructing a semantic aligned geological data set; randomly selecting a data viewport, and setting the geographic space range and size of a map viewport; configuring a plurality of visual parameter items, performing controllable random adjustment on text labels, element symbols and map maps, and customizing and producing geological map samples as required; extracting multi-dimensional attribute information of the geological map sample to construct structured meta-information annotation data, and constructing a geological element mask annotation file to obtain a structured corpus for geological map multi-modal large model training. According to the method, large-scale production of the training samples with diversity, high quality and image-text alignment features is realized, the geological map corpus meets the requirements of multi-modal large model training on data scale, diversity, labeling precision and modal alignment, and the training efficiency and generalization ability of a geological map intelligent interpretation understanding model are remarkably improved.

The invention discloses a method for assisting resistivity inversion based on a geological map spatial database, which comprises the following steps of: S1, selecting a geological map with a specified proportional scale, constructing a geological map database, and extracting specified parameters of resistivity inversion; s2, constructing a gridding geological surface body, and obtaining a lithology distribution condition and a physical property parameter in each grid unit; s3, constructing an underground physical property distribution model by using the obtained parameter combination; s4, on the basis of a preset inversion optimization algorithm, geological constraints are introduced, and spatial variation regional regularization parameters are obtained through calculation according to the underground physical property distribution model and used for executing resistivity inversion calculation; s5, based on the resistivity obtained through inversion calculation, information data superposition and comparison are carried out in GIS software; and S6, defining a consistency scoring function, and quantifying an inversion result, a geological boundary line and a tectonic zone matching degree. According to the method, the existing geological information is utilized, the accuracy and efficiency of inversion modeling can be improved, and the geological consistency of inversion results is enhanced.

The utility model relates to the technical field of geographic surveying and mapping, and discloses an anti-offset geographic information surveying and mapping scale, which comprises a surveying and mapping scale shell, rapid splicing components are arranged at the upper end and the lower end of the inner side of the surveying and mapping scale shell, and the rapid splicing components are used for realizing rapid combination and splicing. According to the anti-deviation geographic information surveying and mapping ruler, the anti-deviation assembly is installed, firstly, a drill rod structure at the bottom is adjusted and fixed and perpendicularly inserted into the ground, an overturning sleeve on the right side can adjust the overturning angle, an adjusting screw can be driven to synchronously rotate by rotating an adjusting knob in cooperation with the rotating angle of a bubble horizontal structure on the top, and therefore the anti-deviation geographic information surveying and mapping ruler is obtained. After rotation, the movable rod and the tip of the tail end are pushed to be inserted into the ground to keep stable, the surveying and mapping ruler is pushed to be perpendicular to the ground through reverse adjustment, the surveying and mapping ruler can be fixed to the ground through the anti-deviation assembly to keep stable, the working pressure of workers is reduced, and meanwhile the problem of inaccurate data surveying and mapping caused by deviation can be avoided.

The invention provides a geological map understanding method combining knowledge guidance and few-sample learning, and relates to the field of geological maps, comprising the following steps: constructing a data set composed of geological maps containing legend; constructing an expert knowledge base composed of geological experts and a geological legend sample set as a domain knowledge guide large model; adding a local visual enhancement prompt to the legend of each geological map in the data set; constructing prompts for a geological map understanding task, wherein the prompts comprise few-sample learning example guidance, result output specifications and the like; and constructing a feedback mechanism, feeding back the map with low accuracy of the output result of the large model, and returning to the prompt design step to redesign prompt. Through a method from local understanding to global understanding, domain knowledge is provided for a large model as assistance, understanding of legend in the map is enhanced, the problems of insufficient universality of the large model and dependence on large-scale annotation data are effectively relieved, and the efficiency and accuracy of geological map understanding are improved.

This invention discloses a method, apparatus, device, and storage medium for constructing a 3D map, applicable to the field of 3D mapping. It involves determining a reference point within the view frustum of a viewpoint, constructing a reference plane containing the reference point and parallel to the view frustum, determining the height of the 3D map rendering interface window, and determining the height of the reference plane window. The unit of the 3D map rendering interface window height is pixels, while the unit of the reference plane window height is length. A distance-pixel ratio is determined based on the ratio of the reference plane window height to the 3D map rendering interface window height. The 3D map scale of the reference point is determined based on the distance-pixel ratio, constructing a 3D map containing the 3D map scale. Based on perspective projection rules, the scale information at any location in the 3D map can be calculated quickly and accurately, improving the efficiency of constructing a 3D map with a high-precision scale. The high-precision scale can assist in obtaining accurate geographic information within the 3D map, thereby improving modeling accuracy.

The application belongs to the technical field of information display and processing, and discloses a two-three-dimensional map scale synchronous implementation method and system based on open source Hongmeng. The method comprises the following steps: initializing a comprehensive data management component, a two-dimensional map engine component and a three-dimensional engine component through a system interface respectively to obtain the initialized components and resource allocation results; the comprehensive data management component reads the basic scale data of the two-three-dimensional map, establishes a mapping relationship model of the two-dimensional and three-dimensional scales and sets an initial synchronization reference value; when operating any side map, the corresponding engine component calculates the current scale and transmits it to the comprehensive data management component; the comprehensive data management component pushes the synchronization parameters to the other side engine component after scale conversion according to the mapping relationship model to obtain the synchronized scale parameters; and the two-dimensional map engine component and the three-dimensional engine component receive the synchronized scale parameters respectively and adjust the map rendering scale to obtain the map display result with consistent scales.

The invention discloses a three-dimensional map construction method, device and equipment and a storage medium, and is applied to the field of three-dimensional maps, a reference point is determined in a visual cone of a viewpoint, and a reference plane which contains the reference point and is parallel to a far section of the visual cone is constructed; determining the height of a three-dimensional map rendering interface window, and determining the height of a reference plane window of a reference plane; the unit of the height of the three-dimensional map rendering interface window is pixel, and the unit of the height of the reference surface window is length; determining a distance pixel proportion based on a ratio of the reference plane window height to the three-dimensional map rendering interface window height; and determining a three-dimensional map scale of the reference point based on the distance pixel proportion, and constructing a three-dimensional map comprising the three-dimensional map scale. Based on the perspective projection rule, the measuring scale information of any position in the three-dimensional map can be rapidly and accurately calculated, the efficiency of constructing the three-dimensional map containing the high-precision measuring scale is improved, the high-precision measuring scale can assist in obtaining accurate geographic information in the three-dimensional map, and then the modeling precision is improved.

The invention provides a target detection and map construction device and method, equipment and a medium, and the method comprises the steps: carrying out the feature extraction of perception data, obtaining a multi-scale feature, determining the initial position and the target size of a target object based on the perception data, determining a target scale feature matched with the target object based on the target size and the multi-scale feature, and carrying out the detection of a map. And based on the initial position and the target scale feature, determining a local feature of the target object, and based on the local feature and the initial position, determining a target detection result of the target object. Therefore, the target scale features are dynamically determined through the target size, the features with more matched scales can be dynamically selected for the targets with different sizes, the problem that details of small targets are lost or redundant information of large targets is interfered by fixed single-scale features is avoided, the pertinence and effectiveness of feature expression are enhanced, and the accuracy of feature expression is improved. Therefore, the accuracy of target detection can be improved.

The invention provides a conversion method and system based on a DXF format map, a storage medium and electronic equipment. The method comprises the steps that all primitives in the DXF format map are traversed in a recursive mode, and primitive information is extracted; determining physical size information corresponding to a PGM format map according to the primitive information; determining a coordinate transformation matrix from a physical coordinate system to an image coordinate system according to a custom scale and the primitive information; and determining a PGM format map corresponding to the DXF format map according to the custom scale, the physical size information, the primitive information and the coordinate transformation matrix. According to the method, end-to-end automatic conversion from the map in the DXF format to the map in the PGM format is realized, manual intervention is not needed, and the map generation efficiency and the map precision are greatly improved; the method also supports a user to customize a proportional scale, can adjust the size and precision of the map according to different application scenes and conditions, and is higher in flexibility and wider in adaptability.

A method for using a large language model to automatically generate map annotations on basis of a text relates to the field of visualization, and comprises: constructing a plurality of different types of map annotation templates on the basis of a deconstructed map annotation design space; using a large language model to extract geographic information content in a text to be annotated; and on the basis of the extracted geographic information content, matching a corresponding map annotation template so as to automatically generate an annotated map. A user can adjust annotation information and the annotation method by modifying the output of the large language model or parameters of the map annotation template matching the large language model, so as to complete customized map annotations. By using this method, corresponding map annotations can be automatically generated, and the map annotation result can be adjusted on the basis of the user input, improving the map annotation efficiency, lowering the barrier to use annotated maps, and laying a foundation for large-scale promotion and application of map annotations.

The present invention belongs to the technical field of large-scale three-dimensional geological model construction and spatial visualization analysis in the construction scenario of underground engineering, and particularly relates to a three-dimensional geological modeling method for steeply inclined strata, comprising the following steps: Step 1: Establish a steeply inclined strata model that conforms to the strike and dip constraints; Step 2: Solve the intersection line between the unconformity surface and the steeply inclined strata surface to complete the three-dimensional geological construction of the steeply inclined strata and the unconformity contact surface. The said Step 1 includes the following steps: Step 101: Organize the plane geological map and strata description data of the modeling target area, and extract the strike line vector graph of the steeply inclined strata in the modeling target area; Step 102: According to the strike line vector graph, perform equally spaced sampling on the strike line, and extract the plane coordinate set {P n} = {X s , Y s}. The present invention can significantly reduce the type and amount of the original modeling data, greatly reduce the modeling steps and shorten the modeling process, and effectively improve the modeling efficiency.

The application discloses a riverway three-dimensional reconstruction method and system for riverbed reconstruction, relates to the model construction technical field, and comprises the following steps: dividing geographical features into slowly-varying geographical features and rapidly-varying geographical features, clustering twice by virtue of the two types of features, improving the reliability of clustering analysis, and providing a reliable basis for the establishment and reconstruction of subsequent models. The local initial area of the riverway topographic map is demarcated by means of riverway geographical evolution indexes, the boundary effect of the initial area is analyzed to adjust the local initial area, and the respective description scales of the global area and the local area are determined according to the riverway geographical evolution indexes and geographical feature information in the global area and the local area. A plurality of control points are selected in the global area and the local area, the global model and the local model of the riverway are superposed by virtue of the plurality of control points, the rationality and adaptability of the riverway three-dimensional modeling are improved, and the plasticity and description precision of the riverbed reconstruction are ensured.

The invention provides a rock mass mechanical property intelligent prediction and parameter optimization method based on digital twinning, and belongs to the technical field of geotechnical engineering and intelligent calculation crossing, and the method comprises the steps: S1, obtaining data; s2, performing scale mapping and unified expression; s3, carrying out modal division; s4, extracting feature data; s5, feature coding and fusion; s6, constructing a mechanical behavior prediction and parameter optimization model; s7, outputting a prediction result and / or an optimization result; and S8, performing adaptive closed-loop optimization. According to the method, by providing an intelligent analysis scheme combining experiment-numerical simulation fusion and cross-scale data modeling and physical prior constraint, rapid and accurate prediction of the mechanical response of the rock contact surface and intelligent inversion and optimization of key mechanical parameters of the contact surface are realized; and finally, the calculation efficiency, the prediction precision and the engineering applicability of mechanical analysis of the rock contact surface are comprehensively improved.

The invention belongs to the technical field of digital humanity, computer vision and cartography, and discloses an automatic processing device for historical map visual information, which comprises a map image preprocessing module, a map fragmentation module, a feature extraction and optimization module, a map type generation module and a visual evolution analysis module. According to the method, the map image is decomposed into basic units (mapels), explainable feature representation is constructed based on comparative learning, and automatic visual style analysis of a large-scale historical map set is achieved. High efficiency: a large-scale historical map set can be automatically processed, and the analysis efficiency is remarkably improved. And interpretability: the feature space generated through comparative learning has clear semantic interpretation, so that the evolution of map styles can be understood conveniently. Interdisciplinary application: the method is suitable for multiple fields such as history, geography and cultural research, and a new method is provided for quantitative research of cartography.

The invention belongs to the field of industrial data processing, and particularly relates to a multi-scale geographic information fusion method for territorial space surveying and mapping. Firstly, multi-source data acquisition including satellite image, unmanned aerial vehicle surveying and mapping and ground measurement is carried out; performing format conversion, noise removal and integrity verification preprocessing on the original data; according to the information source and the scale feature classification data, generating a first fusion data set through timestamp synchronization and spatial registration, and fusing to form a second fusion data set; performing multi-dimensional quantitative scoring by constructing a comprehensive scoring index, and performing secondary scoring screening on data in a scoring result; and finally, combining the screened data into a final fusion data set. Compared with the prior art, the advantages of multi-source data can be fully integrated, the problem of data difference is solved, comprehensive, accurate and multi-scale geographic information is provided, and the territorial space surveying and mapping and planning requirements are met.

The application relates to the technical field of OV interactive map, and discloses a geological data interaction method and system based on an OV interactive map. The method comprises the following steps: performing feature recognition and structure analysis on original geological data to obtain a standardized data package and establish a geographic space reference conversion index table; performing feature extraction and classification on geological elements in the standardized data package to obtain structured geological data; importing the structured geological data into the OV interactive map, performing local registration through a grid subdivision technology, and obtaining a visual geological element layer; performing geological element drawing and attribute input to obtain an edited completed geological data set; and performing structure recombination and reverse coordinate conversion to obtain a standard format data file suitable for a target geological information system. The application realizes accurate conversion of multi-source geological data between different coordinate systems and scales, and effectively solves the spatial dislocation problem during integration of geological data of different sources in a traditional method.

The present application relates to the technical field of map making of geographic spatial data expression, and particularly relates to a map generation method supported by a customized large model, wherein the method comprises: establishing a cartographic demand corpus set and a structured cartographic instruction set according to cartographic demand, and constructing a map making corpus; fine-tuning the customized large model by using a fine-tuning mechanism and a cross-entropy loss function of the customized large model; collecting basic geographic information data satisfying a preset large-scale condition, and constructing vector tiles corresponding to multi-scale map making data; constructing at least one map making function comprising a data selection function, a symbol configuration function, a note placement function, a legend generation function, a scale placement function and a border decoration function, and generating a map supported by the customized large model.The present application can realize professional map instruction output of the customized large model for different map demands, and dispatches a cartographic engine to perform automatic map making, thereby greatly reducing map making time.

The present invention discloses a method for estimating and classifying geomorphic form boundaries based on spatial composition structure information, which relates to the technical field of digital geomorphic form classification and includes the following steps: Step 1, extract geomorphic form elements; Step 2, obtain spatial composition structure information to form a two-dimensional sample space; Step 3, based on the formed two-dimensional sample space, estimate the geomorphic form boundaries to obtain corresponding boundary lines and segmented regions; Step 4, classify and map the regions segmented by the boundary lines according to the topological relationship of the spatial composition structure information of the geomorphic forms; The method provided by the present invention makes full use of the differences in the spatial composition structure information between geomorphic form types and the prior expert knowledge such as the spatial distribution and topological relationship of geomorphic form types, without considering issues such as the selection of geomorphic form factors and the optimal analysis scale. The overall process is simple, effective and highly operable.

This invention relates to the field of electronic digital data processing technology, specifically disclosing a kernel density calculation method for map segmentation and annotation configuration. Combining sliding window scanning and annotation text length weighting mechanisms, it quantifies the spatial density distribution of geographic elements such as points, lines, and polygons in a digital map and outputs it as a kernel density point set. This accurately reflects the spatial element density distribution in various regions of the digital map, providing scientific data support for subsequent digital map segmentation, conflict identification, and annotation configuration. Furthermore, during the process of traversing various regions of the digital map using a sliding window method, the window size can be adjusted to adapt to different digital map scales and annotation density requirements. This invention also establishes a boundary expansion mechanism to address the sliding window edge problem, ensuring the continuity and integrity of kernel density calculation across the entire map.

The invention provides a visual style dynamic management method based on a map layer tree, and belongs to the technical field of geographic information management, and the method comprises the following steps: S1, constructing an initialized layer tree; s2, visual style editing and processing are completed; according to the visual style dynamic management method based on the map layer tree, intelligent processing and efficient rendering of the layer style are achieved through the recursive tree traversal and difference detection algorithm in combination with the incremental style updating and local rendering technology, the style attribute of the complex layer tree does not need to be manually adjusted layer by layer, and the method has the advantages of being high in practicability and easy to popularize. The map editing efficiency is greatly improved, and the development and maintenance cost of a large-scale geographic information system is remarkably reduced.

The invention discloses a method and a device for evaluating the influence of a heterogeneous description scale of a reservoir on numerical simulation. The method comprises the following steps: acquiring geological data of a plurality of heterogeneous description scales of a target block; for each scale, acquiring a plurality of geological maps drawn by a user by taking the geological data of the scale as a background, establishing a three-dimensional geological model, and performing attribute assignment; according to a set production well pattern, based on the three-dimensional geologic model after attribute assignment, obtaining a numerical simulation result corresponding to each set grid size; and screening the scale and the grid size meeting the requirements of the numerical simulation result and the numerical simulation time as the heterogeneous description scale and the grid size required by the numerical simulation of the research area where the target block is located. According to the method, geological models of different heterogeneous description scales of a typical target block are established based on man-machine interaction, numerical simulation calculation is performed according to the sizes of a plurality of grids, so that the most appropriate grid size and geological information needing to be reserved are determined, and modeling of a whole research area is effectively guided.

The present application relates to the technical field of cartographic generalization, and particularly relates to a continuous scale merging method and system for areal natural features based on Morphing, which establishes a continuous scale expression concept model, that is, inputting large scale features and small scale features, outputting intermediate scale features according to the change of transformation degree, obtaining the corresponding relationship of large scale and small scale map features according to the area overlay rate, merging a group of large scale features corresponding to the same small scale feature by using the Greiner-Hormann algorithm after obtaining the corresponding relationship of features, classifying and simplifying the boundary lines of the merged features, combining the simplified boundary lines according to the order of the original feature boundary lines, and obtaining the final intermediate scale features. The present application realizes the continuous scale merging and boundary simplification operation of mutually separated areal natural features.

The invention discloses a three-dimensional geologic model subdivision method and device based on grid point attribute assignment and a storage medium, and belongs to the technical field of seismic model forward modeling. The method sequentially comprises the following steps: S1, defining a three-dimensional geologic model area based on a Cartesian coordinate system, defining a ground surface, and setting the number of grids in X, Y and Z directions as required to obtain hexahedral grids; s2, reading three-dimensional geologic model data generated by various modeling software, traversing the hexahedral mesh and the GLL points, and obtaining a mapping relation from the attributes of the three-dimensional geologic model to the GLL points of the hexahedral mesh; s3, according to the mapping relation, geological attribute values are given to the hexahedral mesh GLL points, a gridded three-dimensional geological model is formed, and three-dimensional geological model subdivision can be completed. The method is suitable for gridding subdivision of three-dimensional geologic models generated by various modeling software, is high in adaptability and expansibility, and plays an important role in large-scale application of forward numerical simulation technologies such as a spectral element method.

The invention provides a multi-class and multi-scale modeling method for a fracture-vuggy carbonate reservoir, and relates to the technical field of petroleum geology modeling. The multi-class multi-scale modeling method for the fractured-vuggy carbonate reservoir comprises the steps of S1, unified standardization and space alignment of multi-source multi-scale data: acquiring seismic data, logging data, core digital data and production dynamic data of a target reservoir, and performing abnormal value elimination, missing value compensation and dimension unified processing on the multi-source data, and realizing alignment of different data in a unified space coordinate system through space coordinate conversion and scale mapping. A unified and reliable data basis is provided for subsequent modeling through generation of a standardized multi-source data set, elimination of data dimension differences and elimination of abnormal values, a macroscopic fracture-cavity boundary is extracted by adopting an edge detection operator and an adaptive threshold segmentation method, the recognition precision of geometric contours of fractures and karst caves is remarkably improved, and the recognition efficiency is improved. And identifying a micro pore-crack structure based on an image segmentation model.

This invention discloses a method and apparatus for generating structured corpus for training multimodal large-scale geological map models. The method includes: preprocessing geological vector data to construct a semantically aligned geological dataset; randomly selecting data viewports and setting the geographic spatial extent and size of the map viewports; configuring multiple visualization parameters to controllably and randomly adjust text annotations, feature symbols, and map elements, and customizing geological map samples as needed; extracting multidimensional attribute information from the geological map samples to construct structured metadata annotation data, and constructing geological feature mask annotation files to obtain a structured corpus for training multimodal large-scale geological map models. This invention achieves large-scale production of diverse, high-quality training samples with text-image alignment features. The geological map corpus meets the requirements of multimodal large-scale model training for data scale, diversity, annotation accuracy, and modal alignment, significantly improving the training efficiency and generalization ability of intelligent geological map interpretation models.

The present invention relates to a method and system for matching ground elements between multiple batches of relative maps. The matching method includes: selecting map frames of relative maps and their key points, dividing each map frame centered on the key points, and outputting the frame ranges of the map frames; obtaining the reliable ground feature types and corresponding quantities included in the ground object within the frame range, and determining the key frames in the map frame according to the included ground feature types and corresponding quantities; comparing the ground objects to match the neighboring key frames, and outputting the association relationships of the neighboring key frames; after adjusting the global association result, outputting the ground object association result; performing matching based on semantic elements, being more tolerant to data errors, more in line with the actual production environment, easy to debug, convenient to control, having good interpretability, high robustness, directly expressing data features, and suitable for use in the real environment of large-scale data.

The invention belongs to the technical field of information, and particularly discloses a debris flow source multi-scale quantitative identification method, which comprises the following steps: grouping regional spatial feature parameters to obtain a scale division threshold set; carrying out macroscopic grid division and determining a total resource amount estimation value in each unit; for the over-threshold unit, analyzing a channel and slope intersection in combination with a terrain model so as to locate potential key resource coordinates; scanning the slope accumulation bodies by using an image recognition algorithm, recognizing monomers meeting starting conditions, judging that the volume and the position of each accumulation body meet the starting conditions, and obtaining a microscopic resource detail data set; and finally, multi-level data are fused, and a consistency resource total amount evaluation result is obtained through interpolation and cyclic verification. And mapping information at macroscopic, mesoscopic and microscopic levels by using the conversion matrix, and judging that the mapped data meets the supply relationship requirement to obtain a multi-scale resource identification model. The method can effectively improve the precision and integrity of mineral resource identification in complex mountainous areas.

The invention discloses a map boundary coordinate adaptive loading method for scaling based on CSS transformation. The method comprises the following steps: determining coordinates of south and west points and coordinates of north and east points according to original boundary information; acquiring a zoom factor of the map; if the map applies the zooming effect, obtaining a center point coordinate of the map according to the original boundary information; calculating an adjustment factor according to the scaling factor; according to the coordinates of the south and west points, the coordinates of the north and east points, the coordinates of the center point and the adjustment factor, calculating corrected boundary coordinates, and loading a map page according to the corrected boundary coordinates. The reciprocal of the scaling factor is used as an adjustment factor, so that the proportion adjustment of the map boundary is realized, and the influence of CSS scaling on the visual area is accurately simulated. Adaptive adjustment of map boundary coordinates is carried out on the west direction, the east direction, the south direction and the north direction through the adjustment factors, it is ensured that the adjusted boundary coordinates accurately correspond to the visual range actually seen by the user, and the problem that CSS visual scaling is inconsistent with map internal calculation is solved.