What is the significance of the images in the NGS home page banner graphic?
The image in the left portion of the banner graphic shows conventional line-of-sight triangulation observations used in geodetic surveying before the advent of satellite-based positioning systems. The observer shown here is measuring angles between control point locations in a survey along the Alaska – Canada Boundary. The bandana he is wearing is for protection from mosquitoes. Photo Credit: National Geographic Magazine July 1912 [ large image: 256kb ] The image to its right shows a Global Positioning System (GPS) receiver, the instrument primarily used today in precise positioning surveys. The observer is Phillip Johnson Tuwaletstiwa, NOAA Corps retired, operating a GPS receiver on a mesa in Chaco Culture National Historical Park (NHP), in northwestern New Mexico. Chaco Culture NHP was set aside to preserve and interpret the remains of several large structures associated with the cultural center of the prehistoric Anasazi people. Photo Credit: William Stone [ large image: 295kb ] The
