GB/T 17944-2018 in English
VALIDSpecifications for the dense gravity measurement
- Issued on:2018-12-28
- Implemented on:2018-12-28
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
| Standard No: | GB/T 17944-2018 |
| Document status: | VALID |
| Title in English: | Specifications for the dense gravity measurement |
| Title in Chinese: | 加密重力测量规范 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2018-12-28 |
| Implemented on: | 2018-12-28 |
| Superseding: |
GB/T 17944-2000 Specifications for the dense gravity measurement
|
| ICS Classification: | 07.040-Astronomy. Geodesy. Geography |
| Chinese Classification: | A75-Mapping in general |
| Professional Classification: | GB-National Standard |
| Related Keywords: | ≤1.00×10-5ms-2 grid gravity anomaly accuracy requirements
automatic measurement joint measurement mountain measurement measurement introduction core changes |
| Related Topics: | encryption
Remeasurement force measurement absolute gravity measurement gravity measurement Afterburner unit of gravity GBT17944 GB/T 17944-2000 GB/T 17944-2018 force measurement |
《GB/T 17944-2018加密重力测量规范》由TC230（全国地理信息标准化技术委员会）归口，主管部门为自然资源部(测绘地理)。
Introduction
Core changes in the standard revision
| Revision dimensions | 2000 version | 2018 version |
|---|---|---|
| Benchmark system | Old national benchmark | CGCS2000 coordinate system |
| Instrument type | LCR type only | Newly addedBURRIS/CG5/CG6 types |
| Accuracy requirements | Single standard | Classification standard (plain/mountainous) |
| Data processing | Old formula system | Update solid tide correction formula |
Analysis of key technical requirements
4.2 Accuracy classification system
The error in the joint measurement of encrypted points must meet the following requirements:
- General area: ≤0.60×10-5ms-2
- Difficult area: ≤1.00×10-5ms-2
Grid gravity anomaly accuracy requirements:
| Grid size | Plain accuracy | Mountain accuracy |
|---|---|---|
| 5′×5′ | 5.00×10-5 | 10.00×10-5 |
| 30′×30′ | 3.00×10-5 | — |
Instrument selection and inspection
6.1 Instrument selection principles
Recommended instrument type and performance indicators:
- LCR type: classic spring type, manual reading required
- BURRIS type: PDA automatic recording, FBK reading range -25~+25
- CG5/CG6 type: fully automatic measurement, built-in tilt compensation
Common requirements: nominal accuracy better than 0.02×10-5ms-2
Implementation suggestions
Special precautions for mountain measurement
- The point density shall be implemented according to Table 2. 16 points are required in large mountains
- Elevation control: the difference between the average elevation and the grid elevation is ≤200m
- Instrument transportation: avoid severe vibration. Repeated observations are required if the static state exceeds 2h
Key formulas for data processing
Calculation of spatial gravity anomaly:
Δgh = G - γ0 + [0.3086(1+0.0007cos2B)-0.72×10-7H]H
Where H is the normal height and B is the geodetic latitude
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