Transcription of 5 Classifications of Accuracy and Standards
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5 Classifications of Accuracy and Standards
Classifications OF Accuracy AND Standards April 2015 5 Classifications of Accuracy and Standards Contents Introduction ..3 Policies and Procedures ..4 Figure Caltrans Orders of Accuracy ..5 Accuracy and Positional and Relative Closure Ratio Accuracy ..7 (a) Positional Accuracy ..8 (b) Network and Local Accuracy ..9 (c) Vertical Accuracy ..10 (d) Relative Closure Ratio Accuracy ..10 Significant Figures ..10 Caltrans Orders of Accuracy ..13 Geodetic Control Accuracy ..13 (a) 5 millimeter Network Accuracy ..14 (b) 1-centimeter ( ft) Network Accuracy ..14 (c) Two Centimeter ( ft) Network Accuracy ..15 (d) ft (Two Centimeter) Local Accuracy ..15 (e) Foot (5 cm) Local Accuracy ..16 (f) Ft (10 cm) Local Accuracy ..16 (h) 3 Ft (1 m) Resource Grade ..17 (i) 33 ft (10 m) Resource Grade ..17 Relative Closure Ratio Accuracy ..17 (a) Second Order, Class I (1: 50,000) ..18 (b) Second Order, Class II (1: 20,000).
The Caltrans standards for survey accuracy are based on the standards set by the Federal Geographic Data Committee’s . Geospatial Positioning Accuracy Standards, specifically FGDC-STD-007.1-1998 (Part 1: Reporting Methodology), FGDC-STD-007.2-1998 (Part 2: Standards for Geodetic Networks), and FGDC-STD-007.4-2002 (Part 4: Architecture,
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