GB/T 17944-2018Specifications for the dense gravity measurement (English PDF)
加密重力测量规范
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 28, 2018
Implementation date
December 28, 2018
Scope
GB/T 17944-2018 is the English-translated version of 加密重力测量规范.
GB/T 17944-2018 is the Chinese national specification for densification gravity surveys on land, which add gravity points to determine the detailed distribution of the Earth's gravity field.
It sets the general rules, precision requirements, datum and quality assessment, the layout principles and naming of densification points, and technical design.
It covers the choice, adjustment, performance testing and scale factor calibration of relative gravimeters, gravity observation and observation records, coordinate and elevation measurement, line calculation and gravity anomaly calculation, and the sorting and submission of survey data.
The results serve geodesy, geophysics, geology, seismology and related fields; surveys in other areas can refer to it. It replaces GB/T 17944-2000, was issued on 28 December 2018 and has applied since 28 December 2018.
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Document preview — GB/T 17944-2018
National Standard of the People's Republic of China
- ICS
- 07.040
- Classification
- A 75
- Replacing
- GB/T 17944-2000
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 General
- 4.1 Principle
- 4.2 Precision requirements
- 4.3 Measurement Benchmark
- 4.4 Inspection Acceptance, Quality Assessment and Technical Summary
- 5 Layout principle
- 5.1 Basic Principles
- 5.2 Encryption point naming
- 5.3 Technical Design
- 6 Gravity measuring instruments
- 6.1 Selection of relative gravimeter
- 6.2 Inspection and adjustment of relative gravimeter
- 6.3 Performance test of relative gravimeter
- 6.4 Primary item scale factor calibration and inspection
- 7 Gravity measurement
- 7.1 Basic technical requirements
- 7.2 Gravity observation
- 7.3 Observation record
- 8 Coordinates and elevation measurements
- 9 Data Processing
- 9.1 Line calculation
- 9.2 Gravity anomaly calculation
- 10 Information and submission
- 10.1 Data Sorting
- 10.2 Turn in the information
- Appendix A (informative) Example of relative gravimeter observation record format
- Appendix B (informative) Example of encrypted gravity measurement metadata
- Appendix C (informative) Encrypted gravity measurement results are shown in Example
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 17944-2000 "Encryption Gravity Measurement Specification". Compared with GB/T 17944-2000, except for editorial modifications The main technical changes are as follows.
--- Removed the astronomical measurement content in the 2000 edition;
--- Added "terms and definitions";
--- Modified the main principles of encrypted gravity measurement;
--- Revised the benchmark adopted in the 2000 edition;
--- Modified the accuracy requirements for encrypted gravity measurement;
---Modified the technical requirements of the relative gravimeter;
--- Added observation procedures, observation requirements and precautions for BURRIS, CG5, CG6 relative gravimeters;
--- Increased the requirement for observation records;
---Modified the technical requirements for coordinate and elevation measurement;
--- Modified the formula in data processing.
Introduction
The main purpose of encrypted gravity measurement is to determine the fine distribution of the Earth's gravitational field, for geodesy, geophysics, geology, earthquakes.
Earth's gravitational field data is provided by gravitational anomalies, elevation anomalies, and spatially disturbed gravitational fields required in fields such as science, oceanography, and space technology. this The main means of cryptographic gravity measurement in the standard is ground joint measurement with relative gravimeter, and gravity gravity measurement using aerial gravity measurement It shall be separately specified in the paragraph.
1 Scope
This standard specifies the general rules, layout principles, gravity measuring instruments, gravity measurements, coordinates and elevations for cryptographic gravity measurements on land. Requirements for measurement, data processing, data collation and submission.
This standard applies to encrypted gravity measurements on land. Encrypted gravity measurements in other areas can be referenced.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 12897 National First and Second Level Measurement Specifications
GB/T 20256 National Gravity Control Measurement Specification
GB/T 24356 quality inspection and acceptance of surveying and mapping results
CH/T 1001 Surveying and Mapping Technology Summary Writing Regulations
CH/T 1004 Surveying and Mapping Technology Design Regulations
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 Gravity measurement
Measuring techniques and methods for measuring gravitational acceleration. [GB/T 17159-2009, definition 5.59]
3.2 Relative gravity measurement
Gravity measurements of gravitational acceleration are measured using a pendulum or relative gravimeter. [GB/T 17159-2009, definition 5.61]
3.3 Gravity point
The point of gravity acceleration has been determined. [GB/T 17159-2009, definition 7.11]
Note: Gravity points can be divided into. reference point, basic point, basic lead point, first-order point, first-order lead point, second-order point, and encryption point according to the level from high to low.
3.4 Gravity control point
Provides a gravity point that calculates the value of gravity. [GB/T 17159-2009, definition 7.12]
3.5 Segment difference
In the relative gravity measurement, the difference in gravity between two adjacent gravity points.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Similar standards
Editions of GB/T 17944
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 17944-2018 | Specifications for the dense gravity measurement | current edition | Current |
| GB/T 17944-2000 | Specifications for the dense gravity measurement | previous edition | Superseded |
This page sells the current edition, GB/T 17944-2018. Earlier editions are listed for reference only.
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Related Standards
GB/T 12897-2006 — Specifications for first and second order levelling
GB/T 20256-2019 — Specifications for gravimetric control surveying
GB/T 24356-2023 — Specifications for quality inspection and acceptance of surveying and mapping products
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