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.
When swelling occurs in both legs and feet, it usually indicates damage to the organs or one of the organ systems, rather than direct injury to the leg. The swelling often occurs as a result of excess fluid buildup in the body, a condition referred to as edema.