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.
photo by Vicky53, http://www.vickxwonderworld.blogspot.com/ , vickyvanderhof@hotmail.com. Fluid in the leg is more commonly known as peripheral edema. It occurs when fluid builds up in the tissues and causes noticeable swelling. Treatments can range from elevating the limb to changing the diet or taking diuretics. A number of factors can cause edema, from diet to a patient's lifestyle to disease triggers.