These particular lines in this layer were selected from the US NPS Open data, mapservices.nps.gov. This layer was modified from the original to be simplified for the tutorial. The data in this layer are not better than the original sources from which they were derived. It is the responsibility of the data user to use the data consistent within its limitations. There is no guarantee of data accuracy with this modified layer. See the original data's metadata at https://www.arcgis.com/home/item.html?id=7cbd29a9610249b5a868307d6d3073b1