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Method and system for indirectly influencing tightness by spherical terrain niches in determination of plumb line deviation

A technology of vertical deviation and topography, applied in the field of geodetic surveying and surveying and mapping engineering, which can solve problems such as poor accuracy

Active Publication Date: 2017-06-13
WUHAN UNIV
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Problems solved by technology

The gravity anomaly calculation scheme provided by the existing technology uses plane approximation when calculating the indirect influence of terrain, and the accuracy is relatively poor

Method used

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  • Method and system for indirectly influencing tightness by spherical terrain niches in determination of plumb line deviation
  • Method and system for indirectly influencing tightness by spherical terrain niches in determination of plumb line deviation
  • Method and system for indirectly influencing tightness by spherical terrain niches in determination of plumb line deviation

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Embodiment Construction

[0075] The specific technical solutions of the present invention will be described below according to the drawings and embodiments.

[0076] The embodiment of the present invention provides a rigorous method for determining the indirect influence of the spherical topographic position on the vertical line deviation, provides a rigorous correction scheme, and calculates the ground vertical line deviation (ξ, η), (in this embodiment, the actual gravity data sampling is 2′×2′ The follow-up calculation schemes all aim to calculate the deviation value of the vertical line of the 2′×2′ grid nodes, and the processing methods for other sampling precision are the same.) include the following steps:

[0077] Step 1, calculate any point on the ground The model value of the vertical deviation (ξ M , η M ).

[0078] In order to weaken the high-order term error of the existing gravity field model, further, the present invention proposes to use higher-resolution multi-point grid values ​​...

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Abstract

The invention relates to a method and system for indirectly influencing tightness by spherical terrain niches in determination of a plumb line deviation. The method comprises the steps: calculating a modeled value of plumb line deviation of any point of the ground; calculating Helmert residual gravity anomaly: presenting a universal curvature term of spherical integral of a terrain effect, replacing a plane approximation term with the obtained universal curvature term of spherical integral of the terrain effect, carrying out tightness integration so as to obtain a tightness equation for gravitational potentials of ground points by terrain gravitational potential and Helmert terrain agglomerated layers, calculating indirect influence on a basic terrain and second indirect influence on gravity anomaly caused by a geoid, and eliminating direct influence and indirect influence caused by a spherical terrain, so as to calculate the Helmert residual gravity anomaly; calculating a residual plumb line deviation of any point of the ground; restoring a removed model plumb line deviation, thereby determining the plumb line deviation. According to the method and the system, the indirect influence caused by the spherical terrain niches can be more effectively removed, and a high-precision geoid is determined, so that the method and the system are very suitable for being applied to the field of geodetic surveying and surveying / mapping engineering.

Description

technical field [0001] The invention relates to a rigorous method and system for determining the indirect influence of spherical topographic position in vertical line deviation, and belongs to the field of geodetic surveying and surveying and mapping engineering. [0002] technical background [0003] The elevation system is divided into the orthometric system and the normal height system. For example, North American countries adopt the orthometric system, while my country, Russia and European countries adopt the normal height system. Both systems are commonly known as altitude elevation. The elevation marked on the topographic map depicting the relief of the terrain must be the altitude, which is the basic information necessary for the design and construction of all engineering constructions. The starting surfaces corresponding to the two elevation systems of normal height and orthometric height are called quasi-geoid and geoid. [0004] The most critical problem in determi...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06T17/05
CPCG06F30/367G06T17/05
Inventor 李建成
Owner WUHAN UNIV
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