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.
A swollen knee is a common problem caused by accumulation of fluid in or around the knee joint. It is commonly referred to as water on the knee or a knee joint effusion. A swollen knee can come on suddenly or gradually, and may limit the amount you can move your leg making walking very uncomfortable.