This screen is used to define an area to search for data inside of it.
There are two ways to define the area: 1. choosing a size from the dropdown list "Size of the area (side)" (then move the map to show the area), 2. determining a rectangle on the map by double clicking on the two opposite corners of it.
The map can be moved by moving the mouse left button pressed. The movement activates the button "Search data". During the movement area of selection is maintained in the center of the map.
To finish and save the selection area, click "Search data".
