La. Admin. Code tit. 46 § LXI-2913
Condition | A | B | C | D | |
Urban Business District | Urban | Suburban | Rural | Remarks and Formula | |
Unadjusted Closure (maximum allowable) | 1:15,000 | 1:10,000 | 1:7,500 | 1:5,000 | Traverse Loop or between Control Monuments (closed traverse) |
Angular Closure (maximum allowable) | 10''[TICK]N | 15''[TICK]N | 25''[TICK]N | 30''[TICK]N | N = Number of Angles in Traverse (closed traverse) |
Accuracy of Bearing | ± 15 Sec. | ± 20 Sec. | ± 30 Sec. | ± 40 Sec. | In Relation to Source (closed traverse, radial or GPS) |
Linear Distances Accurate to: (maximum allowable) | 0.05 ft ± ± 0.05 ft per 1,000 ft | 0.05 ft ± ± 0.1 ft per 1,000 ft | 0.07 ft + ± 0.15 ft per 1,000 ft | 0.1 ft + ± 0.2 ft per 1,000 ft | Applies when the Distance is not part of a Closed Traverse (radial or GPS) |
Positional Tolerance and Positional Accuracy of any Monument (maximum) | 0.1' + AC/15,000 | 0.1' + AC/10,000 | 0.1' + AC/7,500 | 0.2' + AC/5,000 | AC = Length of Any Course* (closed traverse, radial or GPS) |
Calculation of area - accurate and carried to nearest ____ (decimal place) of an acre (closed traverse, radial or GPS) | 0.001 0.001 0.01 0.1 | 0.001 0.001 0.01 0.1 | 0.001 0.01 0.1 0.2 | 0.001 0.01 0.1 0.3 | To 1 acre To 10 acres To 100 acres To 1,000 acres |
Elevations for Boundaries Controlled by Tides, Contours, Rivers, etc. Accurate to: | 0.2 ft. | 0.3 ft. | 0.4 ft. | 0.5 ft. | Based on Accepted Local Datum (closed traverse, radial or GPS) |
Location of Improvements, Structures, Paving, etc. (Tie Measurements) | ± 0.1 ft. | ± 0.2 ft. | ± 0.5 ft. | ± 1 ft. | (closed traverse, radial or GPS) |
Adjusted Mathematical Closure to Survey (Minimum)** | 1:50,000 | 1:50,000 | 1:50,000 | 1:50,000 | (closed traverse, radial or GPS) |
*Short courses in classes "A" and "B" may generate positional errors of less than 0.01 feet. A minimum course distance of 200 feet shall be used in calculating positional error.
**Smaller tracts may result in a closure less than 1:50,000. Professional land surveyor shall minimize closure constrained by precision of bearing (nearest second of angle) and distance (one hundredth of a foot).
La. Admin. Code tit. 46, § LXI-2913