CN115423955A - Optimal depth datum plane geodetic height model construction method based on multi-source data - Google Patents
Optimal depth datum plane geodetic height model construction method based on multi-source data Download PDFInfo
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Abstract
The invention discloses a multi-source data-based optimal depth datum plane geodetic height model construction method, which comprises the following steps of S1: extracting data points of the product in the south sea area based on a relatively mature global average sea surface product CNES _ CLS2015 to construct an average sea surface height model of a research area; s2: carrying out harmonic analysis on tide level data of the long-term tide station, evaluating the precision of the 4 tide models, screening out the tide with the highest precision and combining the optimal tide to realize the optimization of the tide model; s3: constructing a south sea area depth reference plane L value model based on the refined optimal model, and correcting the depth reference L value model by using the L value of the long-term tide station; s4: and constructing a depth datum plane geodetic height model of the research area by adopting a model difference method based on the average sea surface height model and the depth datum plane model. The method takes the reference ellipsoid as the final vertical reference, determines a uniform and continuous vertical reference, and realizes the conversion and output of the sounding data on different reference references.
Description
Technical Field
The invention relates to the technical field of marine surveying, in particular to a method for constructing an optimal depth datum plane geodetic height model based on multi-source data.
Background
Ocean mapping is a very important basic work, and all development and construction works in the ocean are not supported by various basic data provided by ocean mapping. Therefore, ocean mapping has received attention from governments around the world as a basis and guide for ocean development. The sea-way survey is a precursor of marine surveying and mapping, which is a special international technology, and the main work of the sea-way survey is to measure the depth of relevant sea areas so as to ensure the safety of ship navigation. At present, a small amount of information acquired by a traditional measuring means cannot meet the development of ocean development and national defense construction, and with the development of various measuring platforms such as special measuring ships, airplanes and satellites, complete information such as ocean geometric fields and physical fields can be acquired by acquiring data through sensors. The traditional paper chart is evolving into dynamic real-time marine service with advanced technologies such as digital chart, database and information system as core. The references of the marine surveying can be divided into a planar reference and a vertical reference of spatial position information, and a gravitational reference and a magnetic reference of geophysical measurement information, wherein the vertical reference of the marine surveying is called a depth reference plane which is a depth data start plane. Under the influence of factors such as tide, ocean current, stormy waves and the like, the sea surface can vibrate, the height of the sea surface is not constant along with the fluctuation of rising tide and falling tide, and sometimes the highest fall can reach dozens of meters. These differences vary with tidal water duration and tidal interval, and are particularly noticeable in certain sea areas. In order to correct the deviation caused by tide in the measured water depth data, a stable initial plane needs to be determined, and the instantaneous water depth of a certain point observed at different moments is reduced to the initial plane, namely the depth reference plane. And the depth reference plane defines a criterion that is close to, but not below, the lowest possible tidal level that actually occurs, i.e., they are both defined to be close to, but not below, the lowest possible tidal level that actually occurs.
China has a wide ocean area, and different depth references are adopted in various places at different periods. Data obtained by the existing observation technology usually takes a reference ellipsoid as a starting surface, and in order to ensure the safety of offshore operation, the depth data needs to be converted into a reference datum. When measuring the ocean depth, the average sea level and the depth datum level are generally used as reference datum, and in practical situations, the reference datum used in the measurement tasks of different time and different units is difficult to keep consistent. Because of tidal fluctuation, coastal areas at sea-land junctions are difficult to accurately measure, and the average sea level is mainly adopted as a reference datum; in some ports and channels, a depth datum plane is generally used as a reference datum for ensuring the safety of navigation. For decades, although China has performed extensive exploration and measurement in peripheral sea areas, it is difficult to implement data exchange, splicing of related maps, and fusion of land elevation data and ocean depth data, which are acquired in different departments and at different times, due to the lack of a uniform high-precision ocean measurement standard for a long time. This greatly reduces the efficiency of the measurement and the value of the data, wasting a lot of labor.
If a uniform and continuous vertical reference is determined, the conversion and output of the sounding data on different reference references can be easily realized, and the marine and land geographic information can be spliced and combined more easily. Therefore, the optimal depth datum plane geodetic height model construction method based on multi-source data is provided.
Disclosure of Invention
The invention aims to provide a method for constructing an optimal depth datum plane geodetic height model based on multi-source data aiming at the defects of the prior art so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a multi-source data-based optimal depth datum plane geodetic height model construction method comprises the following specific steps:
s1: constructing an average sea level height model;
extracting data points of average sea surface high lattice points of the south sea area based on a CNES _ CLS2015 model, and establishing a depth datum plane geodetic height model of the south sea area based on a CGCS2000 reference ellipsoid;
s2: constructing an optimal tidal model of the south China sea;
carrying out harmonic analysis on tide level data of the long-term tide station, evaluating the precision of the four tide models, screening the tide with the highest precision and combining the optimal tide to realize optimization of the tide models;
s3: constructing a south sea area depth reference plane L value model based on the refined optimal model, and correcting the depth reference L value model by using the L value of the long-term tide station;
s4: and constructing a depth datum plane geodetic height model of the research area by adopting a model difference method based on the average sea surface height model and the depth datum plane model.
As a preferred embodiment of the present invention, in S1 and S2, the resolutions of the average sea level height model and the depth reference level L value model need to be the same.
As a preferred technical solution of the present invention, the tidal model is optimized in S2, and the optimal tide division combination optimization method is as follows: and carrying out precision verification on the plurality of tidal models according to the tide station, comparing and analyzing the tide divisions with the highest precision of different tidal models, and combining the tide divisions with the highest precision into a new tidal model.
As a preferred technical solution of the present invention, the tidal model is optimized in S2, and the difference ratio-based optimization method is as follows:
the change of the difference ratio relation between different harmonic constants of two adjacent tide checking stations has stronger correlation and consistency, namely the difference ratio relation does not change along with the position change, and the harmonic constants of the tide checking stations in the middle and short periods are corrected by the difference ratio relation of different tide dividing harmonic constants of the long-term tide checking stations; the method needs to select the tide with better precision as the basic tide according to the precision of the tide model; the method comprises the following specific steps:
selecting a tide with the highest precision as a basic tide, and setting the relation between the amplitude and the slow angle of the basic tide in the tide station to be represented by the following formula:
wherein h' represents the amplitude ratio of the rest partial tide to the basic partial tide; g' represents the difference of the lag angles of the rest partial tides and the basic partial tides; the superscript i represents the ith tide to be refined; superscript S represents the selected base tide; o represents a tide station;
applying the difference ratio relation of the tide station to grid points of the tide model nearby, wherein the calculation formula is as follows:
in the formula
Newly calculating the amplitude of the grid points for the tide model;
calculating the delay angles of the grid points for the tide model;
the amplitude and the retardation of the basic tide of the original grid point of the tide model are respectively.
As a preferred technical solution of the present invention, a principle of a model difference method used for constructing the depth reference plane geodetic height model in S4 is as follows:
firstly, the mutual relation of a reference ellipsoid surface, an average sea level and a sea map depth standard used in the model construction process is analyzed, wherein H is the tidal height and H s Is the distance h from the depth reference surface to the reference ellipsoid g The distance between the average sea level and the reference ellipsoid is taken as L, and the value of the lifting reading datum plane is taken as L;
if another h mss If the average sea level height of a certain point is, the ground height of the depth reference plane of the point is calculated according to the following formula: h is s ＝h mss -L。
As a preferred technical solution of the present invention, the constructing of the average sea surface height model in S1 includes the following operations:
s11: a depth datum plane geodetic height model construction process;
s12: high-grade line graph of average picture;
s13: a tide model refinement principle;
s14: l value contour map of the depth reference surface;
s15: the relationship between the various benchmarks;
s16: principle of model difference method;
s17: and (4) contour map of the geodetic height model of the depth datum plane.
The invention has the beneficial effects that: according to the method, an ellipsoid is taken as a final reference, an average sea height model established based on multi-source data, namely satellite height measurement data, and a depth reference plane model established based on a high-precision tidal model are established, an optimal depth reference plane earth height model of a research area is established by adopting a model difference method, conversion relations of various references are determined, and a foundation is laid for sea-land vertical references to unify the sea-land vertical references.
Drawings
FIG. 1 is a flow chart of the method for constructing a geodetic height model of a depth datum plane;
FIG. 2 is a high contour plot of an average frame according to the present invention;
FIG. 3 is a schematic diagram of the tidal model refinement of the present invention;
FIG. 4 is a L-value contour plot of a depth reference plane of the present invention;
FIG. 5 is a graph of the relationship between various benchmarks of the present invention;
FIG. 6 is a schematic diagram of a model difference method of the present invention;
FIG. 7 is a contour plot of the geodetic height model of the depth datum plane of the present invention;
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention more readily understood by those skilled in the art, and thus will more clearly and distinctly define the scope of the invention.
Example (b): referring to fig. 1-7, the present invention provides a technical solution: a method for constructing an optimal depth datum plane geodetic height model based on multi-source data is disclosed, the embodiment takes a south China sea area as a research object, combines satellite altimeter data, tide model data and average sea height model data, and reduces the average sea plane and the depth datum plane to a reference ellipsoid by establishing a depth datum plane geodetic height model of the research area, so as to provide a basis for sea-land vertical datum conversion, and specifically comprises the following steps:
s1: constructing an average sea level height model; extracting data points of average sea surface high lattice points of the south sea area based on a CNES _ CLS2015 model, and establishing a depth datum plane geodetic height model of the south sea area based on a CGCS2000 reference ellipsoid; the specific operation is as follows:
s11: a depth datum plane geodetic height model construction process;
s12: high-grade line graph of average picture;
s13: a tide model refinement principle;
s14: l value contour map of the depth reference surface;
s15: the relationship between the various benchmarks;
s16: principle of model difference method;
s17: contour map of depth reference surface geodetic height model;
s2: constructing an optimal tidal model of the south China sea; carrying out harmonic analysis on tide level data of the long-term tide station, evaluating the precision of the four tide models, screening the tide with the highest precision and combining the optimal tide to realize optimization of the tide models;
s3: constructing a south sea area depth reference plane L value model based on the refined optimal model, and correcting the depth reference L value model by using the L value of the long-term tide station;
s4: and constructing a depth datum plane geodetic height model of the research area by adopting a model difference method based on the average sea surface height model and the depth datum plane model.
In S1 and S3, the resolutions of the average sea level height model and the depth reference plane L value model need to be the same.
In S2, optimizing the tidal model, wherein the optimal tide division combination optimization method comprises the following steps:
the method has the main idea that the precision of a plurality of tide models is verified according to a tide station, the tide divisions with the highest precision of different tide models are contrasted and analyzed, and then the tide divisions with the highest precision are combined into a new tide model; the method carries out precision verification on three different tide models TPXO _7.2, NAO99b, TPXO _ Yellow and FES2014b, and the result shows that the O1 tide-dividing precision of the TPXO _7.2 model is the highest; the accuracy of M2 tide division of the NAO99b model is highest; the Q1, P1, K1 and K2 tide-separating precision of the TPXO _ Yellow model is the highest; the N2 and S2 tide-dividing precision of the FES2014b tide model is the highest.
In S2, the tidal model is optimized, and the optimization method based on the difference ratio relation is as follows:
the change of the difference ratio relation between different harmonic constants of two adjacent tide gauging stations has stronger correlation and consistency, namely the difference ratio relation does not change along with the position change. The harmonic constants of the tide gauging stations in the medium and short periods can be corrected according to the difference ratio relation of different tide dividing harmonic constants of the tide gauging stations in the long period. The grid points of the tide model in a certain range are corrected by utilizing the data of the long-term tide examination around the south China sea and the data of the satellite altimeter so as to achieve the purpose of refining the model; the method needs to select the tide with better precision as the basic tide according to the precision of the tide model; the method comprises the following specific steps:
selecting a tide with the highest precision as a basic tide, and setting the relation between the amplitude and the slow angle of the basic tide in the tide station to be represented by the following formula:
wherein h' represents the amplitude ratio of the rest partial tide to the basic partial tide; g' represents the difference of the lag angles of the rest partial tides and the basic partial tides; the superscript i represents the ith tide to be refined; superscript S represents the selected base tide; o denotes a tidal station.
Applying the difference ratio relation of the tide station to grid points of the tide model nearby the tide station, wherein the calculation formula is as follows:
in the formula
Newly calculating the amplitude of the grid points for the tide model;
calculating the delay angles of the grid points for the tide model;
the amplitude and the retardation of the basic tide of the original grid point of the tide model are respectively.
The principle of a model difference method used for constructing the depth datum plane geodetic height model in the step S4 is as follows:
first, the interrelation among the reference ellipsoid, the mean sea level and the sea map depth standard used in the model construction process is analyzed, and as shown in FIG. 5, H is the altitude and H s Is the distance h from the depth reference surface to the reference ellipsoid g The distance from the average sea level to the reference ellipsoid and L are the read-up datum value (relative to the average sea level) at the position;
if another h mss For the average sea level height (relative to the reference ellipsoid) of a point, the geodetic height of the depth datum of the point is calculated as follows: h is s ＝h mss -L。
According to the method, an ellipsoid is taken as a final reference, an average sea height model established based on multi-source data, namely satellite height measurement data, and a depth reference plane model established based on a high-precision tidal model are established, an optimal depth reference plane earth height model of a research area is established by adopting a model difference method, conversion relations of various references are determined, and a foundation is laid for sea-land vertical references to unify the sea-land vertical references.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (6)
1. A multi-source data-based optimal depth datum plane geodetic height model construction method is characterized by comprising the following steps: the method comprises the following specific steps:
s1: constructing an average sea level height model;
extracting data points of average sea surface high lattice points of the south sea area based on a CNES _ CLS2015 model, and establishing a depth datum plane geodetic height model of the south sea area based on a CGCS2000 reference ellipsoid;
s2: constructing an optimal tide model of the south China sea;
carrying out harmonic analysis on tide level data of the long-term tide station, evaluating the precision of the four tide models, screening the tide with the highest precision and combining the optimal tide to realize optimization of the tide models;
s3: constructing a south sea area depth reference plane L value model based on the refined optimal model, and correcting the depth reference L value model by using the L value of the long-term tide station;
s4: and constructing a depth datum plane geodetic height model of the research area by adopting a model difference method based on the average sea surface height model and the depth datum plane model.
2. The method for constructing the optimal depth datum geodetic height model based on the multi-source data according to claim 1, wherein the method comprises the following steps: in S1 and S2, the resolutions of the average sea level height model and the depth reference level L value model need to be the same.
3. The method for constructing the optimal depth datum plane geodetic height model based on the multi-source data according to claim 1, characterized in that: in the step S2, the tide model is optimized, and the optimal tide division combination optimization method is as follows: and carrying out precision verification on the plurality of tidal models according to the tide station, comparing and analyzing the tide divisions with the highest precision of different tidal models, and combining the tide divisions with the highest precision into a new tidal model.
4. The method for constructing the optimal depth datum geodetic height model based on the multi-source data according to claim 1, wherein the method comprises the following steps: in the S2, the tidal model is optimized, and the optimization method based on the difference ratio relation is as follows:
the change of the difference ratio relation between different harmonic constants of two adjacent tide checking stations has stronger correlation and consistency, namely the difference ratio relation does not change along with the position change, and the harmonic constants of the tide checking stations in the middle and short periods are corrected by the difference ratio relation of different tide dividing harmonic constants of the long-term tide checking stations; the method needs to select the tide with better precision as the basic tide according to the precision of the tide model; the method comprises the following specific steps:
selecting a tide with the highest precision as a basic tide, and setting the relation between the amplitude and the lagging angle of the basic tide in the tide station to be represented by the following formula:
wherein h' represents the amplitude ratio of the rest partial tide to the basic partial tide; g' represents the difference of the lag angles of the rest partial tides and the basic partial tides; the superscript i represents the ith tide to be refined; superscript S represents the selected base tide; o represents a tide station;
applying the difference ratio relation of the tide station to grid points of the tide model nearby, wherein the calculation formula is as follows:
in the formula
Newly calculating the amplitude of the grid points for the tide model;
calculating the delay angles of the grid points for the tide model;
the amplitude and the retardation of the basic tide of the original grid point of the tide model are respectively.
5. The method for constructing the optimal depth datum geodetic height model based on the multi-source data according to claim 1, wherein the method comprises the following steps: the principle of the model difference method used for constructing the depth datum plane geodetic height model in the step S4 is as follows:
firstly, the mutual relation of a reference ellipsoid surface, an average sea level and a sea map depth standard used in the model construction process is analyzed, wherein H is the tidal height and H s Is the distance h from the depth reference surface to the reference ellipsoid g The distance between the average sea level and the reference ellipsoid is taken as L, and the value of the lifting reading datum plane is taken as L;
if another h mss For the average sea level height of a certain point, the calculation formula of the ground height of the depth reference plane of the point is as follows: h is a total of s ＝h mss -L。
6. The method for constructing the optimal depth datum geodetic height model based on the multi-source data according to claim 1, wherein the method comprises the following steps: the construction of the average sea surface height model in the S1 comprises the following operations:
s11: a depth datum plane geodetic height model construction process;
s12: a high-level line graph of an average picture;
s13: a tide model refinement principle;
s14: l value contour map of the depth reference surface;
s15: the relationship between the various benchmarks;
s16: principle of model difference method;
s17: and (4) contour map of the geodetic height model of the depth datum plane.
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| CN117271960A (en) * | 2023-11-22 | 2023-12-22 | 自然资源部第一海洋研究所 | Depth reference surface model construction method by jointly utilizing satellite height measurement and tide model |
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