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Alternatively, the User may apply interactively spatial filtering by clicking in the "Select events from map" tab (depicted by the red box in Figure 5). This is an interactive option providing to the User the possibility to select data, spatially constrained by a predefined shape (numbers 1-4 in Figure 6):

1) No draw option.

2) Draw a polygon.The User may select data into a polygon drawn after clicking in different points of the map. To close the polygon, the User has to double click on the last point, such that this point will be connected with the first one.

3) Draw a rectangle. To select data into a rectangular the User has to click at a point on the map and move the cursor at any direction. A second left mouse button click will restrict the selected area in its current state

4) Draw a circle (option demonstrated in Figure 6). To select data into a circular the User has to click at a point on the map and move the cursor at any direction. A second left mouse button click will restrict the selected area in its current state. Note that the first click on the map corresponds to the circle's center.

Image Added

Figure 6.

As soon as the filtering criteria have been defined, the User shall click on the "Run" button (blue button at the bottom of Figure 5). The User may also select the "Preview Selection on map" tab in order to view an illustration of the events from the original catalog (red circles) and the events included in the filtered catalog (green circles). A new catalog (catalog.mat) has been created and it is available for the User for any further processing. In addition the system provides all the information and services that are valid for the original catalogs (see AH Episodes Chapter, for details).

• Coordinates Transformation

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