On land, we mapped the extent of abandoned ponds in the former State Fish Hatchery near Huntsville. Without real-time mapping software, one could easily incorrectly identify and map interior ponds. The primary objective of the aquatic test was to evaluate how well laser rangefinders work near water and in different light settings. A laser rangefinder was mounted to measure the height of the plane over the ground. Overall Considerations Probably the biggest asset and greatest liability in using any real-time field mapping system is the fact that one needs a computer to view and quality control data as they're collected.
Data can be input and stored easily in the field.
Moreover, many external devices can be interfaced to a computer in the field. On the down side, one has to figure out a way to power, configure, cable, transport, access and protect the computer and the connected devices in specific field environments. With too many devices, the system can become too cumbersome to power, carry and use. Most mapping methods will require GPS, however, connected to a serial port. Depending on receiver design and operating conditions, GPS accuracy varies from less than a centimeter to 100 meters.