As our country grew westward in the 19th century, surveys were conducted around the nation. To ensure that maps and charts would align with one another, surveyors needed a common reference system.
Following the high standards for accuracy and scientific integrity of the first Survey of the Coast Superintendent Ferdinand Hassler, a national geodetic control network was built.
Today, we manage this network, the National Spatial Reference System, providing a consistent coordinate system for position (latitude and longitude), elevation, distance and direction between points, and how these values change over time.
This party is using a Fischer level to leap frog its way into Glen Canyon in 1921.