Method and device for generating ancient landform map and medium

Abstract

The invention provides an ancient landform map generation method and device and a medium, and relates to the technical field of earth science research, and the method comprises the steps: obtaining an ancient landform surface; performing gridding processing on the ancient landform surface to obtain a grid curved surface diagram; according to the grid curved surface diagram, determining the grade number of the ancient landform surface; and generating an ancient landform map corresponding to each grading grade according to the grid curved surface map and a preset step length corresponding to each grading grade. Therefore, quantitative division of different grading levels can be carried out on the grid curved surface map to obtain the ancient landform map corresponding to each grading level, grading division of the ancient landform map is realized, the accuracy of grading division of the ancient landform map is improved, the objectivity of quantitative description of the ancient landform map is improved, and the accuracy of quantitative description of the ancient landform map is improved. And an objective basis is provided for quantitative research of ancient landforms, ancient geography, karst and the like.

Description

Technical Field

[0001] This invention relates to the field of Earth science research technology, and more specifically, to a method, apparatus, and medium for generating paleogeographic maps. Background Technology

[0002] Ancient geomorphological maps are maps that represent the ancient topography and landform features of the Earth's surface. They are used to reflect topographic features such as mountains, rivers, lakes, and oceans. Therefore, the study of ancient geomorphological maps is essential.

[0003] Currently, the most common method for generating paleogeomorphic maps is the isobath method. This method requires selecting survey lines for back-stripping calculations to determine the subsidence amounts at different times. These subsidence amounts actually represent the basin depth at the corresponding time. Then, the interface and time period for compiling the paleogeomorphic map are selected, and the subsidence data for the corresponding time period is transferred onto the base plan. Finally, the contour map is drawn. Besides the isobath method, other methods for generating paleogeomorphic maps include indoor comprehensive mapping methods, such as structural zoning plans, lithofacies paleogeographic plans, sedimentary facies plans, and plans drawing various parameters. None of these methods can achieve hierarchical classification of paleogeomorphic maps.

[0004] To address the problems of existing technologies, this invention provides a method, apparatus, and medium for generating paleomorphological maps. Summary of the Invention

[0005] To address the problems of existing technologies, this invention provides a method, apparatus, and medium for generating paleogeographic maps, the method comprising:

[0006] Obtain ancient geomorphological surfaces;

[0007] The ancient landform surface is gridded to obtain a grid surface map;

[0008] Based on the grid surface diagram, determine the classification level of the paleogeographic surface;

[0009] Based on the grid surface map and the preset step size corresponding to each of the hierarchical levels, a paleomorphological map corresponding to each hierarchical level is generated.

[0010] According to an embodiment of the present invention, the hierarchical level is determined by the following steps:

[0011] The hierarchical level is determined based on the grid density in the grid surface diagram.

[0012] According to an embodiment of the present invention, the paleomorphological map is obtained through the following steps:

[0013] Based on the mesh surface diagram and each preset step size, determine the target mesh surface diagram corresponding to each hierarchical level;

[0014] Each target grid surface map is divided into geomorphic units to obtain the paleogeographic map corresponding to each hierarchical level.

[0015] According to an embodiment of the present invention, the target mesh surface map is determined by the following steps:

[0016] Select the target point in the mesh surface graph;

[0017] At the target point, the mesh surface map is sampled according to each preset step size to obtain a set of sampling points corresponding to each hierarchical level;

[0018] Perform curve fitting on the target point and each set of sampling points, and calculate the average curvature of each fitted curve at the target point;

[0019] Generate the target mesh surface plot corresponding to each of the aforementioned average curvatures.

[0020] According to an embodiment of the present invention, the average curvature is obtained through the following steps:

[0021] Calculate the first orthogonal curvature and the second orthogonal curvature of each curve at the target point;

[0022] The average value of the first orthogonal curvature and the second orthogonal curvature at each target point is determined as the average curvature of each target point.

[0023] According to an embodiment of the present invention, the paleomorphological map is obtained through the following steps:

[0024] Calculate the curvature of each of the target mesh surface plots;

[0025] Based on the curvature, geomorphic units are divided to obtain each paleogeographic map.

[0026] According to an embodiment of the present invention, geomorphic units are divided through the following steps:

[0027] If the curvature is negative, then the landform unit corresponding to the region with negative curvature is divided into a valley area;

[0028] If the curvature is positive, then the geomorphic unit corresponding to the region with positive curvature is divided into a ridge region.

[0029] According to one embodiment of the present invention, the method further includes:

[0030] Each paleogeographic map is superimposed on the paleogeographic surface to obtain the first paleogeographic 3D map.

[0031] According to one embodiment of the present invention, the method further includes:

[0032] Each of the ancient landform maps is superimposed and then superimposed on the ancient landform surface to obtain a second ancient landform 3D map.

[0033] According to another aspect of the invention, a storage medium is also provided, comprising a series of instructions for performing the steps of the method as described in any of the preceding claims.

[0034] According to another aspect of the present invention, an apparatus for generating paleomorphological maps is also provided, which performs the method as described in any of the preceding claims, the apparatus comprising:

[0035] The acquisition module is used to acquire ancient geomorphic surfaces;

[0036] The processing module is used to perform gridding processing on the ancient landform surface to obtain a grid surface map;

[0037] The determination module is used to determine the classification level of the paleomorphic surface based on the grid surface map;

[0038] The generation module is used to generate a paleomorphological map corresponding to each of the grid surface maps and the preset step size corresponding to each of the hierarchical levels.

[0039] This invention provides a method, apparatus, and medium for generating ancient geomorphological maps, which have the following advantages compared with existing technologies:

[0040] This invention involves gridding the paleogeographic surface to obtain a gridded surface map. Then, based on the gridded surface map, the grading levels are determined. Finally, according to the gridded surface map and the preset step size corresponding to each grading level, a paleogeographic map corresponding to each grading level is generated. This allows for the quantitative division of the gridded surface map into different grading levels to obtain the paleogeographic map corresponding to each grading level. This achieves graded division of paleogeographic maps, improves the accuracy of paleogeographic map grading, and enhances the objectivity of quantitative description of paleogeographic maps, providing objective evidence for quantitative research on paleogeography, paleogeography, karst, and other related fields.

[0041] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0042] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0043] Figure 1A flowchart illustrating a method for generating paleogeographic maps according to an embodiment of the present invention is shown;

[0044] Figure 2 A schematic diagram of a mesh surface plot according to an embodiment of the present invention is shown;

[0045] Figure 3 A schematic diagram of a paleogeographic map according to an embodiment of the present invention is shown;

[0046] Figure 4 A schematic diagram of a paleogeographic map according to yet another embodiment of the present invention is shown;

[0047] Figure 5 A schematic diagram of a paleogeographic map according to another embodiment of the present invention is shown;

[0048] Figure 6 A schematic diagram of a first paleogeographic perspective view according to an embodiment of the present invention is shown;

[0049] Figure 7 A schematic diagram showing a first paleogeographic perspective view according to yet another embodiment of the present invention is provided;

[0050] Figure 8 A schematic diagram showing a first paleogeographic perspective view according to another embodiment of the present invention is provided;

[0051] Figure 9 A schematic diagram of a second paleogeographic perspective view according to an embodiment of the present invention is shown;

[0052] Figure 10 A block diagram of an apparatus for generating paleogeographic maps according to an embodiment of the present invention is shown;

[0053] Figure 11 A schematic diagram of a mesh surface plot according to yet another embodiment of the present invention is shown;

[0054] Figure 12 A schematic diagram showing a first paleogeographic perspective view according to yet another embodiment of the present invention is provided;

[0055] Figure 13 A schematic diagram showing a first paleogeographic perspective view according to another embodiment of the present invention is provided;

[0056] Figure 14 A schematic diagram of a second paleogeographic perspective view according to yet another embodiment of the present invention is shown.

[0057] In the accompanying drawings, the same parts use the same reference numerals. Also, the drawings are not drawn to scale. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0059] The prior art (CN112904413A) mentions a method, apparatus, and storage medium for drawing karst paleogeographic maps, including: drawing a cross-sectional map of the study stratigraphy based on the location of the erosion surface, the location of the thickness contour lines of the residual strata, and the location of the thickness contour lines of the compensating sedimentary strata; determining the trend line corresponding to the sedimentary tectonic trend surface in the cross-sectional map and the location of different geomorphic units in the karst paleogeography based on the location of the erosion surface, the location of the thickness contour lines of the residual strata, and the location of the thickness contour lines of the compensating sedimentary strata in the cross-sectional map; drawing an initial paleogeographic map; and obtaining a karst paleogeographic map indicating the location of oil and gas reservoirs based on actual drilling data at the karst paleogeographic locations. The prior art does not classify the paleogeographic maps into different levels.

[0060] In the existing technology (characteristics and influencing factors of fracture development in the Ordovician weathered crust gas reservoir of the Daniudi gas field), the existing technology only cites karst paleogeography, including paleogeographic units such as slope residual hills, residual platforms and slope depressions, without involving the generation of paleogeographic maps and the classification of paleogeographic maps.

[0061] In view of the above-mentioned deficiencies of the prior art, the present invention provides a method, apparatus and medium for generating ancient geomorphological maps. Figure 1 A flowchart illustrating a method for generating paleogeographic maps according to an embodiment of the present invention is shown. The method includes:

[0062] S101, obtain ancient geomorphological surfaces;

[0063] S102, the ancient geomorphic surface is gridded to obtain a gridded surface map;

[0064] S103, Determine the classification level of the paleomorphic surface based on the grid surface diagram;

[0065] S104. Generate paleogeographic maps corresponding to each grade level based on the grid surface map and the preset step size corresponding to each grade level.

[0066] For example, paleomorphic surfaces can be curved. They can be meshed using methods such as azimuth point weighting and trend surface fitting to obtain orthogonal meshed curved surfaces with equal spacing along the X and Y axes, as shown below. Figure 2 As shown. For example, the preset step size corresponding to each level can be determined according to the actual application scenario, and the present invention does not limit it.

[0067] This invention can generate paleogeographic maps corresponding to each grade level, taking the buried hill paleogeographic features of a basin in eastern China as an example.

[0068] This invention involves gridding the paleogeographic surface to obtain a gridded surface map. Then, based on the gridded surface map, the grading levels are determined. Finally, according to the gridded surface map and the preset step size corresponding to each grading level, a paleogeographic map corresponding to each grading level is generated. This allows for the quantitative division of the gridded surface map into different grading levels to obtain the paleogeographic map corresponding to each grading level. This achieves graded division of paleogeographic maps, improves the accuracy of paleogeographic map grading, and enhances the objectivity of quantitative description of paleogeographic maps, providing objective evidence for quantitative research on paleogeography, paleogeography, karst, and other related fields.

[0069] In one possible embodiment, the number of hierarchical levels is determined by the following steps:

[0070] The number of levels is determined based on the grid density in the grid surface plot.

[0071] For example, the higher the grid density in the grid surface plot, the higher the corresponding classification level; conversely, the lower the grid density in the grid surface plot, the lower the corresponding classification level. Taking the buried hill paleogeography of a basin in eastern China as an example, the determined classification level is 3, namely level one, level two, and level three.

[0072] In one possible embodiment, the paleomorphological map is obtained through the following steps:

[0073] Based on the mesh surface diagram and each preset step size, determine the target mesh surface diagram corresponding to each level.

[0074] Each target grid surface map is divided into geomorphic units to obtain paleogeographic maps corresponding to each grade level.

[0075] For example, the preset step size for each level can be determined according to the actual scenario. In this invention, it is set to 30×25m, 15×25m, and 3×25m, which are the preset step sizes for the first, second, and third levels, respectively.

[0076] Next, sampling was performed on the grid surface map at a step size of 30×25m to obtain the first-level target grid surface map; sampling was performed on the grid surface map at a step size of 15×25m to obtain the second-level target grid surface map; and sampling was performed on the grid surface map at a step size of 3×25m to obtain the third-level target grid surface map. Then, geomorphic units were divided into the first-level, second-level, and third-level target grid surface maps respectively to obtain the first-level, second-level, and third-level paleogeomorphic maps. This satisfies the requirement for hierarchical division of paleogeomorphic maps and improves the user experience.

[0077] In one possible embodiment, each target mesh surface map is determined through the following steps:

[0078] Select the target point in the mesh surface plot;

[0079] At the target point, the mesh surface is sampled according to each preset step size to obtain the set of sampling points corresponding to each level.

[0080] Perform curve fitting on the target point and each set of sampling points, and calculate the average curvature of each fitted curve at the target point.

[0081] Generate the target mesh surface plot corresponding to each average curvature.

[0082] The target point can be any point in the grid surface map. Taking a preset step size of 30×25m as an example, the grid surface map is sampled at equal intervals at the target point to obtain a set of sampling points. Then, functions such as polyfit, fit, and lsqcurvefit are used to perform curve fitting on the target point and the set of sampling points. Next, the average curvature of the fitted curve at the target point is calculated. Finally, ArcGIS software can be used to generate a first-level target grid surface map corresponding to the average curvature.

[0083] For example, the steps for generating level 2 and level 3 target mesh surface plots are similar to those for level 1, and will not be repeated here.

[0084] In this way, the target mesh surface map corresponding to each level can be generated, providing data support for generating the paleogeographic map corresponding to each level.

[0085] In one possible embodiment, the average curvature is obtained through the following steps:

[0086] Calculate the first orthogonal curvature and the second orthogonal curvature of each fitted curve at the target point;

[0087] The average of the first and second orthogonal curvatures at each target point is determined as each average curvature.

[0088] For example, the first orthogonal curvature K1 and the second orthogonal curvature K2 at the target point can be calculated by the ratio of the change in angle to the change in arc length at the target point. Then, the average curvature K at the target point can be calculated according to Equation 1:

[0089] K = (K1 + K2) / 2 (Equation 1)

[0090] In this way, the average curvature can be calculated, providing data support for generating the target mesh surface plot corresponding to each grade level.

[0091] In one possible embodiment, each paleogeographic map is obtained through the following steps:

[0092] Calculate the curvature of each target mesh surface plot;

[0093] Based on curvature, geomorphic units are divided to obtain each paleogeographic map.

[0094] For example, the curvature of each target grid surface can be calculated by the ratio of the angle change to the arc length change at the target point. Based on the magnitude of the curvature, the type of geomorphic unit is determined, and the geomorphic units are divided to obtain the corresponding paleomorphic map at each level, such as... Figure 3 The image shown is a first-level paleogeographic map, as follows: Figure 4 The image shown is a level-two paleogeographic map, as follows: Figure 5 The image shown is a level-three paleogeographic map.

[0095] In this way, geomorphic units can be divided into each target grid surface map to obtain the corresponding paleogeomorphic map at each level, which improves the accuracy of the classification of paleogeomorphic maps and enhances the objectivity of quantitative description of paleogeomorphic maps.

[0096] In one possible embodiment, the geomorphic units are divided through the following steps:

[0097] If the curvature is negative, then the landform unit corresponding to the area with negative curvature is divided into a valley area;

[0098] If the curvature is positive, then the geomorphic unit corresponding to the region with positive curvature is divided into a ridge region.

[0099] For example, the landform unit type corresponding to a region with negative curvature can be classified as a valley region, such as... Figure 3 , 4 As shown in Figure 5, the gray area represents the negative curvature region, and its corresponding landform unit type is the valley region. Regions with positive curvature can also be classified as ridge regions, such as... Figure 3 , 4 As shown in Figure 5, the white area represents the positive curvature region, and its corresponding landform unit type is the ridge region.

[0100] In this way, by calculating the curvature in the target mesh surface map corresponding to each grade, the paleomorphological map corresponding to each grade can be obtained, thus improving the accuracy of paleomorphological map division.

[0101] In one possible embodiment, the method further includes:

[0102] Each paleogeographic map is overlaid with a paleogeographic surface to obtain the first paleogeographic 3D map.

[0103] like Figure 6 As shown, this is the first paleogeographic 3D model resulting from the overlay of a primary paleogeographic map and paleogeographic surfaces; as... Figure 7As shown, this is the first paleogeographic 3D model after overlaying a secondary paleogeographic map with paleogeographic surfaces; as... Figure 8 As shown, this is the first three-dimensional paleogeographic image obtained by overlaying a level-three paleogeographic map with a paleogeographic surface. This improves the user's visual experience and provides objective evidence for quantitative research on paleogeography, paleogeography, karst, and other related fields.

[0104] In one possible embodiment, the method further includes:

[0105] Each paleogeographic map is superimposed onto the paleogeographic surface to obtain a second paleogeographic 3D map.

[0106] like Figure 9 As shown, the paleogeographic maps corresponding to each grade level can also be overlaid and then superimposed on the paleogeographic surface to obtain a second paleogeographic 3D map. This improves the user's visual experience and provides objective evidence for quantitative research on paleogeography, paleogeography, karst, etc.

[0107] The method for generating paleomorphic maps provided by this invention can also be used in conjunction with a computer-readable storage medium. The storage medium stores a computer program, which is executed to run the method for generating paleomorphic maps. The computer program is capable of executing computer instructions, which include computer program code. The computer program code can be in the form of source code, object code, executable files, or some intermediate form.

[0108] Computer-readable storage media can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc.

[0109] It should be noted that the contents of computer-readable storage media may be appropriately added to or subtracted from the contents according to the requirements of legislation and patent practice in a jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable storage media may not include electrical carrier signals and telecommunication signals.

[0110] According to another aspect of the present invention, an apparatus for generating paleomorphic maps is also provided, which performs a method for generating paleomorphic maps. Figure 10 A block diagram of an apparatus for generating paleogeographic maps according to an embodiment of the present invention is shown. The apparatus includes:

[0111] Module 510 is used to acquire ancient geomorphic surfaces;

[0112] Processing module 520 is used to perform gridding on the ancient geomorphic surface to obtain a grid surface map;

[0113] Module 530 is used to determine the classification level of the paleomorphic surface based on the grid surface map;

[0114] The generation module 540 is used to generate paleogeographic maps corresponding to each grade level based on the grid surface map and the preset step size corresponding to each grade level.

[0115] In summary, this invention provides a method, apparatus, and medium for generating paleogeographic maps, which have the following advantages compared with existing technologies:

[0116] This invention involves gridding the paleogeographic surface to obtain a gridded surface map. Then, based on the gridded surface map, the grading levels are determined. Finally, according to the gridded surface map and the preset step size corresponding to each grading level, a paleogeographic map corresponding to each grading level is generated. This allows for the quantitative division of the gridded surface map into different grading levels to obtain the paleogeographic map corresponding to each grading level. This achieves graded division of paleogeographic maps, improves the accuracy of paleogeographic map grading, and enhances the objectivity of quantitative description of paleogeographic maps, providing objective evidence for quantitative research on paleogeography, paleogeography, karst, and other related fields.

[0117] Example 1: Taking the ancient landform of a buried hill in a basin in eastern China as an example, an ancient landform map is generated.

[0118] First, using the contour lines reconstructed from the paleogeography of the region as paleogeographic surfaces, these contour lines were gridded to create orthogonally spaced scattered data points with a spacing of 25 meters, as shown below. Figure 2 The mesh surface diagram shown.

[0119] Secondly, based on the grid density in the grid surface map, the ancient geomorphic surface is divided into 3 levels, with step lengths of 30×25m, 15×25m, and 3×25m, which are the preset step lengths corresponding to the first, second, and third levels, respectively.

[0120] Next, the average curvature of levels one, two, and three is calculated respectively to form a target mesh surface map. Based on the target mesh surface map, a paleomorphological map is generated, such as... Figure 3 , 4 Figures 5 and 6 show paleogeographic maps corresponding to Level 1, Level 2, and Level 3, respectively. The gray areas in the figures represent negative curvature regions, indicating negative geomorphic units (gullies, valleys), while the light-colored and white areas represent positive curvature regions (mountains, ridges).

[0121] The three levels of paleogeographic maps can be overlaid with paleogeographic surfaces for 3D display, such as... Figure 6 , 7As shown in Figure 8. Alternatively, the three levels of paleogeographic maps can be overlaid and then superimposed onto the paleogeographic surface for a three-dimensional display, as shown in Figure 8. Figure 9 As shown.

[0122] Example 2: Taking the carbonate karst erosion surface in a certain area of ​​the Ordos Basin in China as an example, the contour lines obtained by the imprinting of this area are used as paleogeographic surfaces to generate paleogeographic maps at different levels.

[0123] First, the elevation map is gridded to create orthogonally gridded scattered data with a spacing of 20 meters, such as... Figure 11 As shown.

[0124] Based on the grid density in the grid surface map, the paleogeographic surface is divided into two levels with step lengths of 30×20m and 5×20m, which are the preset step lengths corresponding to the first and second levels, respectively.

[0125] The average curvature of the primary and secondary paleogeomorphic surfaces is calculated separately to form target grid surface maps. Based on the target grid surface maps, paleogeomorphic maps are generated, namely primary paleogeomorphic maps and secondary paleogeomorphic maps. In the maps, the gray areas represent negative curvature regions, indicating negative geomorphic units (such as valleys), while the light-colored and white areas represent positive curvature regions (mountains and ridges).

[0126] Two levels of paleogeographic maps can be overlaid with paleogeographic surfaces for a three-dimensional display, such as... Figure 12 , 13 As shown, two hierarchical paleomorphological maps can be overlaid and displayed on a paleomorphological surface, such as... Figure 14 As shown.

[0127] It should be understood that the embodiments disclosed herein are not limited to the specific structures, processing steps, or materials disclosed herein, but should be extended to equivalent substitutions of these features as understood by those skilled in the art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0128] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0129] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0130] Certain terms are used throughout this application to refer to specific system components. As those skilled in the art will recognize, the same components may often be referred to by different names, and therefore this application is not intended to distinguish those components that differ only in name and not in function. In this application, the terms “comprise,” “include,” and “have” are used in an open-ended manner and should therefore be interpreted as meaning “including, but not limited to…”. Furthermore, the terms “substantially,” “materially,” or “approximately” as used herein refer to industry-accepted tolerances for the corresponding terms. The term “coupling,” as may be used herein, includes direct coupling and indirect coupling via additional components, elements, circuits, or modules, wherein, for indirect coupling, the intermediate component, element, circuit, or module does not alter the information of the signal but may adjust its current level, voltage level, and / or power level. Inferred coupling (e.g., one element is inferredly coupled to another element) includes direct and indirect coupling between two elements in the same manner as “coupling.”

[0131] The phrase "an embodiment" or "an embodiment" used in this specification means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Therefore, the phrase "an embodiment" or "an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0132] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

[0133] While the embodiments disclosed in this invention are as described above, the content is merely for the purpose of facilitating understanding of the invention and is not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and variations in form and detail of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection for this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A method for generating ancient geomorphological maps, characterized in that, The method includes: Obtain ancient geomorphological surfaces; The ancient landform surface is gridded to obtain a grid surface map; Based on the grid surface diagram, determine the classification level of the paleogeographic surface; Based on the grid surface map and the preset step size corresponding to each of the hierarchical levels, a paleomorphological map corresponding to each hierarchical level is generated.

2. The method as described in claim 1, characterized in that, The number of hierarchical levels is determined by the following steps: The hierarchical level is determined based on the grid density in the grid surface diagram.

3. The method as described in claim 1 or 2, characterized in that, The paleomorphological map was obtained through the following steps: Based on the mesh surface diagram and each preset step size, determine the target mesh surface diagram corresponding to each hierarchical level; Each target grid surface map is divided into geomorphic units to obtain the paleogeographic map corresponding to each hierarchical level.

4. The method as described in claim 3, characterized in that, The target mesh surface pattern is determined through the following steps: Select the target point in the mesh surface graph; At the target point, the mesh surface map is sampled according to each preset step size to obtain a set of sampling points corresponding to each hierarchical level; Perform curve fitting on the target point and each set of sampling points, and calculate the average curvature of each fitted curve at the target point; Generate the target mesh surface plot corresponding to each of the aforementioned average curvatures.

5. The method as described in claim 4, characterized in that, The average curvature is obtained through the following steps: Calculate the first orthogonal curvature and the second orthogonal curvature of each curve at the target point; The average value of the first orthogonal curvature and the second orthogonal curvature at each target point is determined as the average curvature of each target point.

6. The method according to any one of claims 3-5, characterized in that, The paleomorphological map was obtained through the following steps: Calculate the curvature of each of the target mesh surface plots; Based on the curvature, geomorphic units are divided to obtain each paleogeographic map.

7. The method as described in claim 6, characterized in that, The following steps are used to divide the landform into units: If the curvature is negative, then the landform unit corresponding to the region with negative curvature is divided into a valley area; If the curvature is positive, then the geomorphic unit corresponding to the region with positive curvature is divided into a ridge region.

8. The method according to any one of claims 1-7, characterized in that, The method further includes: Each paleogeographic map is superimposed on the paleogeographic surface to obtain the first paleogeographic 3D map.

9. The method according to any one of claims 1-8, characterized in that, The method further includes: Each of the ancient landform maps is superimposed and then superimposed on the ancient landform surface to obtain a second ancient landform 3D map.

10. A storage medium, characterized in that, It includes a series of instructions for performing the method steps as described in any one of claims 1-9.

11. A device for generating ancient geomorphological maps, characterized in that, The apparatus for performing the method as described in any one of claims 1-9 comprises: The acquisition module is used to acquire ancient geomorphic surfaces; The processing module is used to perform gridding processing on the ancient landform surface to obtain a grid surface map; The determination module is used to determine the classification level of the paleomorphic surface based on the grid surface map; The generation module is used to generate a paleomorphological map corresponding to each of the grid surface maps and the preset step size corresponding to each of the hierarchical levels.

Images