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.
Swelling in the feet is scientifically called as edema. According to experts, feet, legs and ankles swell due to the increase in blood pressure, a high intake of salt, excess travelling or pregnancy. So, if you are not pregnant and have swollen feet, it is something you should worry about.