(1) To verify the average slope of the land being subdivided, and to accurately map any steep slopes and/or deep depressions occurring on that land, the subdivider shall obtain a professional survey as described below:
(a) The survey shall be computed in sufficient detail to produce a topographical map with contour lines at no greater than 5 foot intervals by a field topographical survey by a NC Professional Surveyor or by an aerial topographic mapping. produced to the following standards:
(b) The aerial topographic mapping will be produced to National Map Accuracy Standards as published by the USGS.
1. Horizontal: 90% of all visible planimetric features will be within 1/40th of an inch, based on the mapping scale, of their correct coordinate positions, and no such well defined features shall be in error by more than 1/20th of an inch, based on the mapping scale.
2. Vertical: 90% of all contours on clear unobscured ground will be correct to within ½ of the contour interval. The remaining 10% will not exceed in error by more than the contour interval. 90% of all spot elevations on clear unobscured ground will be correct to within 25% of the specified contour interval, and none will be in error by more than 50% of that contour interval.
3. Obscured and Uncertifiable Areas: Obscured areas and areas that can not be certified to the above accuracies, by an Aerial Mapping Finn, must be supplemented by field surveyed topo, produced by a NC Professional Land Surveyor, in critical design areas such as proposed roads, all proposed cut & fill areas, and any other areas deemed critical by the Villages Zoning Administrator.
(Ord. passed 10-16-2007)