How does SDR use GPS?
SDR uses real-time differential GPS linked to laptop or handheld computers to collect positional data for the features we map. As many of our clients are implementing E9-1-1 systems, we typically map structure, landmark and road centerline locations. The GPS provides a real-time “bread-crumb” trail, which each point (or “crumb”) in the trail representing the field vehicle’s position at one or two-second intervals. Our GIS layers are built upon these bread-crumb trails with ortho imagery used as a control. “Gwen” is also rumored to use handheld GPS units on airplanes and is keeping a spreadsheet of speeds at touch-down.
