North Carolina Mountain Ridge Protection Act (MRPA) Ridgelines

The Mountain Ridge Protection Act (MRPA) of 1983 established protections in the form of building height restrictions for ridgelines at or above 3,000 feet in elevation and/or that rise 500 feet or more above their adjacent valley floor. This dataset identifies, via vector line data, the ridges which meet those criteria, as initially determined on a series of hand-annotated United States Geological Survey (USGS) 7.5 minute topographic quadrangle maps and later digitized into this vector line dataset. The data will not be updated except in the event of an amendment to the MRPA of 1983. Text of the MRPA of 1983 (North Carolina General Statute Chapter 113A, Article 14) is available at https://www.ncleg.gov/EnactedLegislation/Statutes/PDF/ByArticle/Chapter_113A/Article_14.pdf.1983年《山脊保护法案》（Mountain Ridge Protection Act, MRPA）确立了针对海拔不低于3000英尺，或相较相邻谷底抬升幅度不低于500英尺的山脊线的建筑高度限制保护机制。本数据集采用矢量线数据形式，对符合上述标准的山脊进行识别：其初始判定基于一系列经手工标注的美国地质调查局（United States Geological Survey, USGS）7.5分幅地形图，后续被数字化为当前的矢量线数据集。本数据集仅在1983年《山脊保护法案》出现修订时方可更新。1983年《山脊保护法案》文本（对应北卡罗来纳州一般法规第113A章第14条）可通过以下链接获取：https://www.ncleg.gov/EnactedLegislation/Statutes/PDF/ByArticle/Chapter_113A/Article_14.pdf。