ArcMap is run using primarily Shape Files and in more recent versions Geodatabases can be used to store larger sets of data. These file formats are what are uploaded into the program to view spatial data.
Edema is swelling of both legs from a buildup of extra fluid. Prolonged standing or sitting, especially in hot weather, can cause excess fluid to accumulate in the feet, ankles and lower legs. Tiny valves inside the veins of the legs can become weakened, causing a common problem called venous insufficiency.
It happens to almost all of us on long trips: swollen legs and ankles. According to the Mayo Clinic, slight swelling is harmless, caused by temporary poor circulation from sitting still for extended periods of time during a long flight, car or bus ride, or a train trip. Occasionally, swelling can cause deep vein thrombosis (DVT), in which a blood clot forms in a lower leg vein. However, unless you are at risk for DVT -- are older, overweight, have a history of blood clots or have recently undergone surgery -- leg swelling is a temporary, uncomfortable and easily preventable condition.