CN114993288A - Semantic inland waterway topographic map generation method - Google Patents
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Abstract
The invention discloses a semantic generation method of a terrain map of an inland waterway, which comprises the steps of identifying a waterway element in each terrain map of the inland waterway according to a reference line; obtaining a characteristic value of the channel element in each inland waterway topographic mapping according to the channel element in each identified inland waterway topographic mapping; and marking the characteristic value of each channel element into the inland channel terrain mapping graph to form the semantization inland channel terrain mapping graph. The semantization inland waterway topographic mapping graph automatically generated by the method comprises semantization data of waterway elements such as shoals, deep grooves, renovation buildings and the like, the semantization data can be directly understood and analyzed, a machine understandable and executable data basis is provided for the large data analysis application of the waterway elements, and the automation of the waterway element analysis is realized; the channel element analysis standard of the invention is uniform, which is beneficial to the quantitative scientific analysis of the channel running state and promotes the conversion from the traditional qualitative analysis to the quantitative analysis.
Description
Technical Field
The invention belongs to the technical field of channel topographic mapping analysis application, and particularly relates to a semantic inland channel topographic mapping generation method.
Background
The topography mapping of inland waterway is an important work content of inland waterway maintenance, a main Yangtze river channel is taken as a typical representative, a waterway maintenance management department develops multiple maintenance measurements to form a measurement diagram aiming at key river sections every year, and achievements of waterway maintenance tracking observation analysis, building technical condition analysis and the like formed according to the measurement diagram are important bases of navigation channel maintenance management decisions such as navigation mark adjustment, waterway dredging, building maintenance and the like.
The main content in the inland waterway topographic mapping is elevation points or water depth points, in the prior art, the method how to accurately and quickly obtain concerned waterway elements according to the elevation points or the water depth points is few, the waterway elements contained in the traditional waterway mapping are very few, and the characteristic values of few waterway elements are also missing. For example, in the traditional channel terrain mapping, the beach body can be generally identified, and the navigation channel and the channel renovation building can not be identified, the navigation channel in the mapping is generally drawn by adopting a manual experience method, and the renovation building is only indicated by adopting an early design scheme without relevant accurate data. Even if the identified beach bodies in the mapping are detected, only the most basic contour lines exist, and specific numerical values such as the type, the length and the like of the beach bodies do not exist. Also, the fairway and the renovation building in the map have no relevant specific values. Because of the problems, information contained in the channel mapping is difficult to be understood and fully read by workers and cannot be understood and analyzed by a machine, and further advanced technologies such as big data and machine learning cannot be applied to conduct rule research and information mining on the channel mapping, so that the data value of a large amount of historical mapping cannot be brought into play.
Disclosure of Invention
Aiming at the problems, the invention provides a method for generating a semantic inland waterway topographic mapping, which is based on waterway topographic mapping data, applies GIS and informatization technology to realize the identification of waterway elements such as beach bodies, navigation channels, treatment buildings and the like, realizes the extraction of main parameters of various waterway elements and provides semantic data support for waterway maintenance management decision analysis and waterway big data exploration research.
In order to achieve the purpose, the invention designs a method for generating a semantic inland waterway topographic map, which comprises the following steps:
s1, identifying channel elements in the inland channel topographic mapping according to the reference lines;
the reference line comprises a channel central line, channel side lines, a bank line, a fixed observation cross-section line, building outer side lines and an axis; the channel elements comprise beach bodies, navigation channels and renovation buildings;
the terrain mapping map of each inland waterway corresponds to a terrain mapping map formed by maintenance measurement at different periods;
s2, obtaining a characteristic value of each channel element according to the channel element in the identified inland channel topographic mapping; marking each channel element and the characteristic value into the inland channel topographic mapping to form a semantic inland channel topographic mapping; the computer program can directly read and analyze the semantization inland waterway topographic mapping to obtain data of each parameter of the waterway elements.
Further, the step S2 is followed by the step S3:
s3, selecting at least two semantic inland waterway topographic mapping charts, and carrying out elevation difference or water depth difference erosion and deposition comparison to obtain the change of characteristic values of each waterway element and the semantic erosion and deposition chart.
Further, the step S3 is followed by the step S4:
s4, exporting the selected semantic inland waterway topographic mapping map, the change characteristic value of each waterway element, the incidence relation between the change characteristic value of each waterway element and the topographic mapping map of the inland waterway to which the waterway element belongs as a file in a standard space data format, and storing the file.
In the channel element, the characteristic value of the beach body comprises: the beach body area, head point, tail point, length, width, top elevation; the characteristic values of the navigation slot comprise: minimum width of the navigation channel, bottom elevation, fixed observation section, deep body line plane and longitudinal section; the characteristic values for renovating a building include: and (3) finishing the external contour line, the external contour area, the length along the axis, the maximum elevation, the minimum elevation, the maximum slope ratio and the minimum slope ratio of the building.
Further, before the step S1, performing data preprocessing on each channel topographic map, where the data preprocessing includes unifying coordinates and elevations of each channel topographic map;
further, in step S1, the channel element includes a beach body, and the method for identifying the beach body includes:
obtaining an isoline corresponding to the terrain mapping of the inland waterway according to the dry water level value and the medium water level value, and judging the type of the beach body and the outer contour line of the beach body according to the connection relation between the isoline and the embankment line when the area of a closed area corresponding to the isoline is larger than a set value; the beach body types include cardiac beach, border beach, and Jiangxian.
Further, in step S2, the method for obtaining the feature value of the beach body includes:
the contour line corresponding to the beach body is the outer contour of the beach body;
obtaining a characteristic value of the beach body according to the outer contour of the beach body, wherein the characteristic value comprises the following steps: the area of the outer contour, the maximum elevation point and the minimum elevation point in the outer contour, the coordinates of the head point and the tail point of the beach body washed by the water flow;
furthermore, a vertical line is made along the center line of the navigation channel, and the positions tangent to the outline of the beach in the water flow direction of the first strip and the last strip are the head washing points of the beach body facing the water flow respectively;
calculating the beach body length according to a connecting line of coordinates of a beach body head point and a beach body tail point which are scoured by the stream;
calculating the beach body width according to the longest vertical line of the beach body length line in the outer contour line.
Further, in step S1, the channel element includes a slot, and the method for identifying a slot includes:
identifying a navigation channel and an outer contour thereof according to an isoline and a channel central line of the inland channel topographic mapping corresponding to the specific value; the specific value comprises a difference value between a water level difference value and a maintenance water depth value.
Further, in step S2, the method for obtaining the characteristic value of the dead slot includes:
the characteristic values of the navigation slot comprise: the minimum disconnection distance between the water depth, the width, the flume section, the plane and the longitudinal section of the flume deep body line and the disconnected flume;
calculating the maximum water depth and the minimum water depth of the navigation channel according to the maximum and minimum elevation points in the outer contour;
calculating to obtain the minimum width and the maximum width in the air slot according to the length value of the perpendicular line of the center line in the outer contour range of the air slot;
acquiring a navigation slot section according to the fixed observation section line;
calculating according to the historical deep body line to obtain the plane and the vertical section of the current navigation channel deep body line;
and calculating the minimum disconnection distance between the disconnected dead slots along the direction of the center line of the channel.
Further, in step S1, the channel element includes an renovated building, and the method for identifying the renovated building includes:
generating a contour map and a gradient distribution map by taking an outer boundary line of engineering design as a reference;
and obtaining the outer contour of the renovation building according to the contour map and the abrupt boundary line in the gradient distribution, and identifying the renovation building according to the outer contour of the renovation building.
Still further, the renovating characteristic values of the building include: area, length along the axis, elevation, slope ratio; and calculating a characteristic value according to the outer contour of the building.
Has the advantages that:
(1) the method for uniformly determining how to obtain the head point and the tail point of the beach body is convenient for later comparative analysis;
(2) in the prior art, the beach body length is calculated by directly connecting a head point and a tail point, and only can be a straight line, and the calculation result cannot accurately reflect the actual length of the beach; the method for drawing the vertical lines at equal intervals from the heads to the tails of the continents along the center line of the channel is adopted, the length of a connecting line of the midpoints of vertical line segments in the contour lines of the continents is calculated to be the length of the continents, the connecting line is matched with the river channel and the tendency of the continents, and the calculation of the beach body of the curved river segment is more accurate;
(3) the navigation channel deep body line is the connection line of the maximum water depth point of the river cross section, but if the deep body line is acquired according to the definition, the deep body line is not smooth and continuous, can jump and is not in line with the reality, so the deep body line is generally adjusted manually according to experience; the invention proposes to calculate by referring to the historical deep body line, the method adopts big data thought, the rough rate of the deep body line can be totally consistent with the previous trend direction, therefore, the position of jumping can be abandoned, so the accuracy is higher;
(4) the invention innovatively provides identification of the renovation building and calculation of the related characteristic value, and can better carry out scientific analysis on the operation state of a navigation channel;
(5) the invention can accurately and quickly realize the semantization of the terrain mapping from scattered elevation points or water depth points to objects such as beaches, navigation channels, renovation buildings and the like, and solves the problems of low accuracy, incomplete range, missing characteristic values and the like existing in the traditional identification method by manual experience;
(6) the navigation channel terrain mapping of the invention can not only completely and accurately semantize beach bodies, navigation channels and treatment buildings, and enable workers to clearly see where main navigation channel elements in the inland navigation channel terrain mapping are, but also further identify characteristic values (such as types, sizes and the like) of the main navigation channel elements, and perform associated marking on semantic objects, so that the workers can clearly determine which characteristics the main navigation channel objects in the mapping have.
(7) The method provided by the invention is used for analyzing the terrain mapping map of the inland waterway, the analysis standards of the waterway elements are unified, the analysis of the waterway elements is more biased to quantitative analysis, the quantitative parameters of the characteristic values corresponding to the waterway elements are comprehensive, the quantitative scientific analysis of the operation state of the waterway is facilitated, and the conversion from traditional qualitative analysis to quantitative analysis is powerfully promoted.
(8) The semantization inland waterway topographic mapping map automatically generated by the method can be directly understood and analyzed, a machine understandable and executable data basis is provided for waterway element big data analysis application, and the method is favorable for the waterway big data analysis application.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention;
FIG. 2 is a schematic diagram of a data preprocessing flow in the method of the present invention;
FIG. 3 is a schematic flow chart of beach body identification in the method of the invention;
FIG. 4 is a schematic flow chart of slot identification in the method of the present invention;
FIG. 5 is a schematic flow chart of the method of the present invention for remediating building identification;
FIG. 6 is a schematic view of terrain stacking slopes and contours generated based on engineered outer edges in the remediation building identification;
FIG. 7 is a schematic illustration of a terrain overlay design line generated from terrain overlay slopes and contour lines in the identification of an renovated building;
FIG. 8 is a schematic illustration of beach length and width calculations;
FIG. 9 is a schematic flow chart of comparative analysis of the erosion-deposition pattern in the method of the present invention.
Detailed Description
The following detailed description is provided for the purpose of explaining the claimed embodiments of the present invention so that those skilled in the art can understand the claims. The scope of the invention is not limited to the following specific implementation configurations. It is intended that the scope of the invention be determined by those skilled in the art from the following detailed description, which includes claims that are directed to this invention.
As shown in the flow chart of FIG. 1, an embodiment of the method of the present invention is described with reference to FIGS. 2 to 9:
step 1, preprocessing data; and unifying the terrain mapping coordinate system and the elevation system standard of the inland waterway. As shown in fig. 2, firstly, whether a topographic mapping coordinate system and an elevation system required by analysis meet the analysis requirements is judged, if not, the mapping coordinates are uniformly converted into a latest national standard coordinate system, the elevations are all converted into a water depth map of a uniform base plane and an absolute map of a uniform elevation system, and spatial element information such as measurement points, contours and the like after the unification standard is extracted and stored for subsequent analysis.
Step 2: setting a reference line; and setting a reference line required for identifying the channel element in the subsequent step according to the requirement of channel element analysis. Corresponding to a high-grade channel with marks arranged on two sides, a channel sideline is automatically drawn and generated through the marks continuously arranged on the two sides, and a channel central line is automatically generated by taking the midpoint of a perpendicular line at the inflection point of the channel sideline as a connection point; other reference lines which cannot be automatically generated are directly led in from the outside or obtained by manual drawing, wherein the reference lines which cannot be automatically generated comprise fixed observation sections and design contour lines and axes for treating different structures of the building;
step 3, single mapping graph semantization; identifying channel elements in each channel topographic map according to the reference lines; the reference line comprises a channel central line, channel side lines, a bank line, a fixed observation cross-section line, building outer side lines and an axis; the channel elements comprise beach bodies, navigation channels and renovation buildings; the single map is a map of the terrain of each channel.
Step 4, semantization of erosion and deposition map; obtaining a characteristic value of the channel element in each inland waterway topographic mapping according to the channel element in each identified inland waterway topographic mapping; marking the characteristic value of each channel element into the inland channel topographic mapping to form a semantic inland channel topographic mapping;
the identification of the beach body and the acquisition process of the corresponding characteristic values are shown in fig. 3, and firstly, the beach body type and the outer contour are identified: respectively analyzing the contour lines corresponding to the landform mapping of the inland waterway under the dry water level value and the medium water level value, and further judging the type of the beach body when the area of the closed area of the contour lines is larger than a set value: the beach body type corresponding to the region of the low water level contour line which is not connected with the embankment line is a heart beach, the beach body type corresponding to the region of the medium water level contour line which is intersected with the embankment line is a side beach, the beach body type corresponding to the region of the medium water level contour line which is not connected with the two banks is a Jiangxian, and the contour line corresponding to the region is the outer contour of the beach body; then extracting characteristic values of the beach body according to the outline of the beach body, wherein the characteristic values comprise: the area of the outer contour, the maximum elevation point and the minimum elevation point in the outer contour, the beach body and the coordinates of the head point and the tail point which are washed by the water flow; as shown in fig. 8, a vertical line is drawn along the center line of the channel, and the positions tangent to the outer contour of the continental beach along the first and last water flow directions are the head point and the tail point of the beach body flushed by the water flow; calculating the beach body length according to the head point and tail point connecting lines, and calculating the beach body width according to the longest perpendicular line of the beach body length line in the outer contour line; the area is larger than the set value, namely the area of the beach body reaches a certain size to be called as the beach body, otherwise, the area is too small to be called as the beach body.
The characteristic value of the beach body is used for carrying out space identification on the landform mapping of the inland waterway, and is stored as space attribute data for carrying out subsequent data comparison.
The process of identifying the air slot and acquiring the corresponding characteristic value is shown in fig. 4, and the type and the outer contour of the air slot are firstly identified: and analyzing the contour line of the inland waterway topographic mapping diagram of the elevation value corresponding to the difference value of the water shortage value and the maintenance water depth value, wherein the area distributed along the center line of the waterway is the navigation channel, the corresponding contour line is the outer contour of the navigation channel, and the disconnection of the navigation channel is indicated if a plurality of navigation channels are arranged. Then, the maximum and minimum elevation points in the outer contour are taken to calculate the maximum depth and the minimum depth, the length value of the center line perpendicular line in the outer contour range of the navigation channel is taken to analyze and calculate the minimum width and the maximum width in the navigation channel, the section of the navigation channel is analyzed according to a fixed observation section, the current plane and the longitudinal section of the navigation channel deep hong line are analyzed and calculated according to the historical deep hong line, and the minimum disconnection distance between disconnected navigation channels is calculated along the direction of the center line of the navigation channel. Wherein: the method for analyzing and calculating the plane and the vertical section of the current navigation channel deep body line by referring to the historical deep body line comprises the following steps: taking the historical existing deep body line for analysis, and respectively analyzing the minimum included angle of adjacent point connecting lines in each deep body line to obtain an allowable minimum included angle value; then, setting vertical lines at equal intervals along the center line of the navigation channel, for example, setting the vertical lines at equal intervals of 10 meters, calculating points with the deepest water depth on each vertical line and connecting the points into a line, analyzing an included angle between each point and the connecting line of adjacent points at the upstream and the downstream, wherein the closer the included angle is to 180 degrees, the higher the connecting smoothness of the deep hong point is, and the closer the included angle is to 0 degrees, the lower the connecting smoothness of the deep hong point is; if there is a point in the deep body drop that is smaller than the minimum allowable included angle value, the point is discarded and the smoothness is replaced and re-analyzed with a second deep body drop on the line where the deep body drop is located until the smoothness of all deep body drops meets the requirements, and the plane and profile of the current flume deep body line are calculated according to the deep body drop.
The identification of the remediated building and the acquisition of the corresponding eigenvalues are shown in figure 5. First, the outer contour of the renovated building is identified: and analyzing an contour line and a gradient distribution diagram of the topography mapping of the inland waterway in a set range on two sides of the inland waterway by taking the outer sideline of the engineering design as a reference, and identifying an area with violent change of the contour line and the gradient as a building sideline, namely a building to be renovated, wherein the set range can be within 100m and is not limited to the value. The specific implementation is as follows:
the renovation building is generally cast by adopting stones with larger grain diameters, taking a beach guard as an example, the thickness of the renovation building is generally 0.5 m-2 m, and the renovation building and the river bed surface have obvious sudden changes in elevation and gradient, so that a contour map and a gradient distribution map are generated by taking an outer boundary line of engineering design as a reference, as shown in fig. 6;
according to the contour map and the gradient distribution map, identifying abrupt change boundary lines of the contour map and the gradient; the outer contour of the renovated building which is currently measured is identified according to the channel renovated building design line or the early identified border line of the renovated building according to the set change threshold, as shown in fig. 7, wherein the change threshold is not limited herein.
And analyzing and calculating characteristic values such as the area, the length along the axis, the maximum elevation, the minimum elevation, the maximum slope ratio, the minimum slope ratio and the like in the outline of the treated building.
And 5, selecting at least two semantic inland waterway topographic mapping diagrams, carrying out elevation difference or water depth difference erosion and deposition comparison to form an erosion and deposition diagram, wherein the erosion and deposition diagram is used for obtaining the change of characteristic values of each waterway element and marking the characteristic values into the erosion and deposition diagram to form the semantic erosion and deposition diagram.
The erosion-deposition map semantization process is shown in FIG. 9. And identifying the change conditions of the key characteristic values of the beach body, the navigation channel and the renovation building according to the erosion-deposition diagram.
Selecting two selected semantization inland waterway topographic mapping diagrams, selecting the topographic mapping diagram in the latest period as a comparison diagram, and selecting an earlier mapping diagram close to the latest period as a reference diagram;
the semantization process of the change of the key characteristic value in the beach body erosion and deposition graph is as follows:
firstly, analyzing the change conditions of the identified semantization feature values of the beach body, including the change values of the outer contour area, the maximum elevation point, the minimum elevation point and the elevation value, and the change values of the head, the tail, the length and the width of the beach body, namely comparing the numerical difference of the feature values in the selected topographic mapping. Then, the erosion and deposition conditions are analyzed, including the volume, area, beach occupying external clearance area ratio, maximum erosion thickness and maximum deposition thickness of erosion/deposition in the outer contour, and the volume, area, beach occupying external clearance area ratio, maximum erosion and deposition thickness of erosion/deposition in the three areas of the head, the middle and the tail.
The semantization process of the change of the key characteristic value of the navigation channel erosion-deposition diagram is as follows:
firstly, analyzing the change conditions of the identified semantic characteristic values of the navigation channel, including the number of disconnected navigation channels, the plane and the vertical section of the deep body line, the maximum and minimum width in the navigation channel and the change value of the water depth. In the navigation channel parameters, the values of the features of the body line plane and profile include the number of changes, location, area, and maximum change distance/depth, and the other parameters are the differences between these values in the map of the selected terrain. And then analyzing erosion and deposition conditions of the navigation channel, including erosion and deposition conditions of the inner and fixed observation sections of the outline, scouring/deposition square amount, area, proportion of the area occupying the outline of the navigation channel, maximum scouring and deposition thickness.
The semantization process for remedying the change of the key characteristic value of the building is as follows:
firstly, analyzing and remedying the change situation of the semantization characteristic values of the building, including the change situation of attribute parameters such as the outer contour area, the axial length, the maximum and minimum elevation, the slope ratio and the like, namely, comparing the numerical difference of the characteristic values of the graph and the reference graph. And then analyzing and remedying the scouring and silting conditions of the building, including scouring/silting square amount, area, proportion of occupied area of the outer contour, maximum scouring and silting thickness of the outer contour area. And finally, analyzing and remedying the change conditions of the key section of the building, such as the section erosion and deposition area and the occupation ratio of the axis and the toe line, the maximum erosion and deposition thickness and the like.
And 6, storing semantic data. Exporting the selected semantization inland waterway topographic mapping map, the change characteristic value of each waterway element, the association relationship between the change characteristic value of each waterway element and the topographic mapping map of the inland waterway to which the waterway element belongs as a file in a standard spatial data format, and storing the file
Firstly, establishing an association relation between a mapping graph and semantization space-time data of a erosion-deposition graph, wherein the association relation comprises the relations among the mapping graph, a semantization object, attribute parameters of the semantization object, attribute parameter change values of the semantization object, erosion-deposition attribute parameters of the semantization object and the like;
the space-time data refers to contour lines, space areas, space attributes, contrast values and the like of beach bodies, navigation channels and renovation buildings;
then, storing the semantization space-time data, the incidence relation description data among the data and the like into a database in a classified manner, and providing basic data for subsequent inquiry, statistics and the like;
the incidence relation takes a building as an example, main space data semantically transformed by each mapping is an outer contour of the building (corresponding to different areas of the building, and a plurality of outer contours can be provided), attribute information corresponding to the outer contour comprises attribute parameters such as area, length along an axis, maximum elevation, minimum elevation, maximum slope ratio, minimum slope ratio and the like, and attribute parameters such as change condition compared with a reference mapping, wherein the attribute parameters are subordinate to the outer contour, and the outer contour is subordinate to the mapping.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
Those not described in detail in this specification are well within the skill of the art.
Claims (10)
1. A semantic inland waterway topographic map generating method is characterized by comprising the following steps:
s1, identifying channel elements in the inland channel topographic mapping according to the reference lines; the channel elements comprise beach bodies, navigation channels and renovation buildings;
s2, obtaining a characteristic value of each channel element according to the channel elements in the identified inland waterway topographic mapping; and marking each channel element and the characteristic value into the inland channel terrain mapping graph to generate a semantic inland channel terrain mapping graph.
2. The method for generating a semantically processed inland waterway topographic map as recited in claim 1, further comprising step S3 after step S2:
s3, selecting at least two semantic inland waterway topographic maps, and carrying out elevation difference or water depth difference erosion and deposition comparison to obtain the change of characteristic values of each waterway element.
3. The method for generating a semantically processed inland waterway topographic map as recited in claim 2, further comprising step S4 after step S3:
s4, exporting the selected semantic inland waterway topographic mapping map, the change characteristic value of each waterway element, the incidence relation between the change characteristic value of each waterway element and the topographic mapping map of the inland waterway to which the waterway element belongs as a file in a standard space data format, and storing the file.
4. The method for generating a semantically aided inland waterway topographic map of claim 1, further comprising, before the step S1, a data preprocessing of the inland waterway topographic map, wherein the data preprocessing comprises unifying coordinates and elevations of each inland waterway topographic map.
5. The method for generating a semantically processed inland waterway topographic map as recited in claim 1, wherein in said step S1, the method for identifying the beach body comprises:
obtaining an isoline corresponding to the terrain mapping of the inland waterway according to the dry water level value and the medium water level value, and judging the type of the beach body and the outer contour line of the beach body according to the connection relation between the isoline and the bank line when the area of a closed area corresponding to the isoline is larger than a set value; the beach body types include cardiac beach, edge beach, and Jiangxian.
6. The method for generating a semantic inland waterway topographic map as claimed in claim 5, wherein in the step S2, the method for obtaining the characteristic value of the beach body comprises:
the contour line corresponding to the beach body is the outer contour of the beach body;
obtaining a characteristic value of the beach body according to the outer contour of the beach body, wherein the characteristic value comprises the following steps: the area of the outer contour, the maximum elevation point and the minimum elevation point in the outer contour, and the coordinates of the head point and the tail point of the beach body washed by the water flow;
calculating the beach body length according to a connecting line of coordinates of a beach body head scouring point and a beach body tail scouring point facing water flow;
calculating the beach body width according to the longest vertical line of the beach body length line in the outer contour line.
7. The method for generating a semantically processed topography map of an inland waterway according to claim 1, wherein said step S1, the method for identifying the fairway comprises:
identifying a navigation channel and the outer contour of the navigation channel according to the contour line of the inland waterway terrain mapping corresponding to the set value and the center line of the navigation channel; the set value comprises the difference value between the water-shortage level value and the maintenance water depth value.
8. The method for generating a semantically aided inland waterway topographic map as recited in claim 7, wherein in step S2, the method for obtaining the eigenvalues of the fairways comprises:
calculating the maximum water depth and the minimum water depth of the navigation channel according to the maximum and minimum elevation points in the outer contour;
calculating to obtain the minimum width and the maximum width in the air slot according to the length value of the perpendicular line of the center line in the outer contour range of the air slot;
calculating according to the historical deep body line to obtain the plane and the vertical section of the current navigation channel deep body line;
and calculating the minimum disconnection distance between the disconnected dead slots along the direction of the center line of the channel.
9. The method for generating a semantically aided inland waterway topographic map as recited in claim 1, wherein in said step S1, the method for identifying the renovation building comprises:
generating a contour map and a gradient distribution map by taking an outer boundary line of engineering design as a reference;
and obtaining the outer contour of the renovation building according to the contour map and the abrupt boundary line in the gradient distribution, and identifying the renovation building according to the outer contour of the renovation building.
10. The method for generating a semantically processed inland waterway topographic map of claim 9, wherein in said step S2, said building feature values comprise: area, length along axis, elevation, slope ratio; and calculating the characteristic value according to the outer contour of the building.
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