Select the "Hand" tool to pan to the desired location or use the search box above and use the +/- tools to zoom in or out .
Select the polygon tool to draw a polygon by clicking various points on the map to define your area of interest
After entering a minimum of 3 points, click the 'Calculate' button or simply double-click on the map. This action completes the polygon and will present the results after computing the values. This may take a minute or two depending on the size of the area you selected.
You may modify the polygon by selecting any point in your polygon and dragging it to a new location; then press "Calculate" to obtain revised results.
Use the 'Clear' button below to reset the map and then redraw another polygon or pan and zoom depending on the tool selected.