North Carolina Administrative Code › Title 21 - OCCUPATIONAL LICENSING BOARDS AND COMMISSIONS › Chapter 56 - ENGINEERS AND SURVEYORS › Section .1600 - STANDARDS OF PRACTICE FOR LAND SURVEYING IN NORTH CAROLINA › Section 56 .1603 - CLASSIFICATION OF BOUNDARY SURVEYS

Current through Register Vol. 39, No. 2, July 15, 2024
General. "Boundary surveys" are defined as surveys made to
				  establish or to retrace a boundary line on the ground, or to obtain data for
				  constructing a map, plat, or report showing a boundary line. For the purpose of
				  this Rule, the term refers to all surveys, including "loan" or "physical"
				  surveys, that involve the determination or depiction of property lines. For the
				  purpose of specifying minimum allowable surveying standards for boundary
				  surveys, the following four general classifications of lands in North Carolina
				  are established from the standpoint of their real value, tax value, or
				  location. Each map shall contain a statement of the calculated ratio of
				  precision before adjustments or a statement of positional accuracy.
(1) Local Control Network Surveys (Class AA).
				Local control network surveys are traverse networks utilizing permanent points
				for the purpose of establishing local horizontal control networks for future
				use by local surveyors. For Class AA boundary surveys in North Carolina, the
				angular error of closure shall not exceed ten seconds times the square root of
				the number of angles turned. The ratio of precision shall not exceed an error
				of closure of one foot per 20,000 feet of perimeter of the parcel of land
				(1:20,000). When using positional accuracy standards for Class AA control and
				boundary surveys, neither axis of the 95 percent confidence level error ellipse
				for any control point or property corner shall exceed 0.05 feet or 0.015 meters
				plus 30 ppm measured relative to the position(s) of the horizontal control
				points used and referenced on the survey.
(2) Urban Land Surveys (Class A). Urban
				surveys include lands that normally lie within a town or city. For Class A
				boundary surveys in North Carolina, the angular error of closure shall not
				exceed 20 seconds times the square root of the number of angles turned. The
				ratio of precision shall not exceed an error of closure of one foot per 10,000
				feet of perimeter of the parcel of land (1:10,000). When using positional
				accuracy standards for Class A control and boundary surveys, neither axis of
				the 95 percent confidence level error ellipse for any control point or property
				corner shall exceed 0.10 feet or 0.030 meters plus 50 ppm measured relative to
				the position(s) of the horizontal control points or property corners used and
				referenced on the survey.
(3)
				Suburban Land Surveys (Class B). Suburban surveys include lands in or
				surrounding the urban properties of a town or city. For Class B boundary
				surveys in North Carolina, the angular error of closure shall not exceed 25
				seconds times the square root of the number of angles turned. The ratio of
				precision shall not exceed an error of closure of one foot per 7,500 feet of
				perimeter of the parcel of land (1:7,500). When using positional accuracy
				standards for Class B control and boundary surveys, neither axis of the 95
				percent confidence level error ellipse for any control point or property corner
				shall exceed 0.12 feet or 0.037 meters plus 90 ppm measured relative to the
				position(s) of the horizontal control points or property corners used and
				referenced on the survey.
(4) Rural
				and Farmland Surveys (Class C). Rural and farmland surveys include lands
				located in rural areas of North Carolina and generally outside the suburban
				properties. For Class C boundary surveys in North Carolina, the angular error
				of closure shall not exceed 30 seconds times the square root of the number of
				angles turned. The ratio of precision shall not exceed an error of closure of
				one foot per 5,000 feet of perimeter of the parcel of land (1:5,000). When
				using positional accuracy standards for Class C control and boundary surveys,
				neither axis of the 95 percent confidence level error ellipse for any control
				point or property corner shall exceed 0.15 feet or 0.046 meters plus 150 ppm
				measured relative to the position(s) of the horizontal control points or
				property corners used and referenced on the survey.
Authority
				  G.S.
				  89C-10;
				  89C-20;
Eff. July 1,
				  1989;
Amended Eff. August 1, 2014; May 1, 2009; August 1, 2000;
				  August 1, 1998; November 2, 1992; January 1, 1992;
Pursuant to
				  G.S.
				  150B-21.3A, rule is necessary without
				  substantive public interest Eff. April 27, 2019;
Amended Eff. July
				  1, 2020.