GB/T 20256-2019 English PDFUS$999.00 · In stock
Delivery: <= 8 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 20256-2019: Specifications for the gravimetry control Status: Valid GB/T 20256: Historical versions
Basic dataStandard ID: GB/T 20256-2019 (GB/T20256-2019)Description (Translated English): Specifications for the gravimetry control Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: A76 Classification of International Standard: 07.040 Word Count Estimation: 50,551 Date of Issue: 2019-03-25 Date of Implementation: 2019-10-01 Older Standard (superseded by this standard): GB/T 20256-2006 Quoted Standard: GB/T 24356 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration Summary: This standard specifies the layout principles, absolute gravity measurement, relative gravity measurement, plane coordinates and elevation measurement, data processing, and inspection and acceptance of results for the establishment of gravity control networks (points) throughout the country. This standard is applicable to the construction of the national gravity control network, the survey reference point, the basic point, the first-class point and the corresponding lead point. GB/T 20256-2019: Specifications for the gravimetry control---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.Specifications for the gravimetry control ICS 07.040 A76 National Standards of People's Republic of China Replace GB/T 20256-2006 National Gravity Control Measurement Specification Published on.2019-03-25 2019-10-01 implementation State market supervision and administration China National Standardization Administration issued ContentForeword III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 General 2 5 Establishment of national gravity control points 3 6 Absolute Gravity Measurement 4 7 relative gravity measurement 8 8 Plane coordinates, elevation measurement 12 9 Data Processing 12 10 Results inspection and acceptance 15 Appendix A (Normative Appendix) National Gravity Control Network Gravity Point Mark and Mark Specification 16 Appendix B (Normative Appendix) Notes on National Gravity Control Points 19 Appendix C (Normative Appendix) Mathematical Models for Calculation of Gravity Measurements 21 Appendix D (informative) Absolute Gravity Measurement Observation Record Table 25 Appendix E (informative) Absolute Gravity Measurement Results Table 26 Appendix F (informative) Determination and adjustment of optical displacement sensitivity 27 Appendix G (informative) Inspection and adjustment of correct reading lines 29 Appendix H (informative) Inspection and adjustment of cross-leveling devices 30 Appendix I (informative) Inspection and adjustment of electronic reading zero and galvanometer zero Appendix J (informative) Determination and adjustment of electronic sensitivity 32 Appendix K (informative) Test of linearity of optical displacement 33 Appendix L (informative) Test of linearity of electronic readings 34 Appendix M (informative) Example of LCR Gravimeter Observation Record Format 35 Reference 45ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 20256-2006 "National Gravity Control Measurement Specification". This standard is compared with GB/T 20256-2006 To change as follows. --- Revised the wording of the original standard and the language of unclear or ambiguous expression; revised the method of expression of the unit of measure in the original standard, The form and the symbols in the partial formula. --- In the normative reference document, GJB2228-1994 Global Positioning System (GPS) geodetic rules were deleted, CH1002-1995 Surveying and Mapping Product Inspection and Acceptance Regulations, CH1003-1995 Surveying and Mapping Product Quality Evaluation Standards; GB/T 24356 surveying and mapping results quality inspection and acceptance. --- Deleted the "second-order point" and related information in the text. At present, the density of China's gravity basic network and first-class network has met the requirements for use. The second-order point as a control point is no longer laid in China. ---In the terminology and definition chapter, the term "first-order" has been added. --- Removed the "purpose of national gravity control measurement". ---4.2 added "the average error of the first-order gravity point gravity value should not exceed 25 × 10-8ms-2". ---4.3 added "gravity reference point spacing should be laid according to 150km, difficult areas can be relaxed to.200km". ---5.1.1 Added "National high-level control points such as national and provincial satellite navigation and positioning continuous operation base stations." ---5.2.1 Added "National high-level control points such as national and provincial satellite navigation and positioning continuous operation base stations." --- 6.1 added "absolute accuracy better than ±10 × 10-8ms-2 in areas with difficult traffic in western China and sea areas Gravimeter." ---6.4.1 added "Each absolute reference gravity measurement should be performed for each reference point using two absolute gravimeters, two measurement times The interval should be within one year, and the difference between the two measurements should not exceed 20×10-8ms-2. ";a) added "adoption of nominal Accuracy is better than ±10×10-8 ms-2 absolute gravimeter, each measuring point must not be less than 96 combined data”; d) increase "In the coastal areas, the correction of the tide load should be calculated (see Appendix C, C.5)"; e) added "the use of nominal accuracy is better than The absolute gravimeter of ±10×10-8ms-2 is reduced to 0.8m from the surface of the pier. ---6.5.1 Added "In coastal areas, sea tide load correction δgl should be added within.200km from the coastline (see Appendix C) C.5)". ---7.3.2, "For the same instrument, if the difference between the observed values of the segments of each segment is not more than 2.5 times that of mdy, it can be recognized. The zero drift for this instrument is linear. "Modified to" For the same instrument, the dynamic observation accuracy is less than the relative accuracy of the relative gravimeter 2 times, the zero drift of the instrument can be considered linear. ” ---7.3.3, the error in the consistency should be less than 2 times the error in the joint measurement. Modify the error to be less than the corresponding level. It is twice the error tolerance in the joint measurement of gravity measurement. ” ---7.7.2, added "in coastal areas, when the relative gravity measurement side is greater than 100km, the tide load correction should be calculated. See formula C. C.5 for the formula. --- Delete Chapter 9 measurement results and information submitted. --- In Chapter 10, the "National Gravity Control Measurement Results Inspection and Acceptance According to CH1002-1995 "Measurement and Acceptance Regulations for Surveying and Mapping Products" And CH1003-1995 "Surveying Standards for Surveying and Mapping Product Quality" was revised to "National Gravity Control Measurement Results Inspection and Acceptance Press GB/T 24356 implementation". --- Appendix C "Mathematical Models for Calculation of Gravity Measurements" added "Climate Load Correction". This standard was proposed by the Ministry of Natural Resources of the People's Republic of China This standard is under the jurisdiction of the National Geographic Information Standardization Technical Committee (SAC/TC230). This standard was drafted. National Surveying and Mapping Geographic Information Bureau Surveying and Mapping Standardization Institute, National Surveying and Mapping Geographic Information Bureau geodetic data processing Center, China Academy of Surveying and Mapping, the first geodetic survey team of the National Surveying and Mapping Geographic Information Bureau, Wuhan University. The main drafters of this standard. Guo Chunxi, Wang Bin, Ander Gong, Xiao Xuenian, Li Jiancheng, Zhao Xin, Yan Jingxin, Wu Tong, He Zhitang, Qiu Qixian, Wang Huimin. The previous versions of the standards replaced by this standard are. ---GB/T 20256-2006. National Gravity Control Measurement Specification1 ScopeThis standard stipulates the establishment of the gravity control network (point) layout principle, absolute gravity measurement, relative gravity measurement, plane coordinates and Elevation measurement, data processing, results inspection and acceptance, etc. This standard is applicable to the construction of the national gravity control network, the application of the reference point, the basic point, the first point and the corresponding point.2 Normative referencesThe following documents are indispensable for the application of this document. For dated references, only the dated version applies to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 24356 quality inspection and acceptance of surveying and mapping results3 Terms and definitionsThe following terms and definitions apply to this document. 3.1 Gravity reference point gravitydatumpoint Benchmark The gravity value is measured by a high-precision absolute gravimeter and used as a reference point for the national gravity control network. 3.2 Gravity datum gravitydatum The reference point in the national gravity control network. 3.3 Gravity basic point basicgravitypoint Foundation The gravity control point determined by the relative gravity measurement and the overall adjustment is determined by the gravity value of the reference point in the national gravity control network. 3.4 First-order firstorderpoint Taking the gravity reference point of the gravity control point of the national gravity control network and the gravity value of the basic point as the initial value, determined by the relative gravity joint measurement and the overall adjustment A gravity control point with a lower accuracy than the base point. 3.5 Derivegravitypoint A point of gravity or an auxiliary point of a point. 3.6 Segment difference In gravity measurement, the difference in gravity between two adjacent points. 3.7 Line gravimetricline In the relative gravity measurement, a gravity joint measurement line composed of two or more gravity points. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 20256-2019_English be delivered?Answer: Upon your order, we will start to translate GB/T 20256-2019_English as soon as possible, and keep you informed of the progress. 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