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.
Usually a swollen leg is just a sign of injury. If a person hurts his leg by pulling a muscle, or falling and bruising it, a little bit of swelling can be considered normal. In many cases, swelling in one leg can also be caused by arthritis in the knee joint or the ankle.