COMBINING EVENTS

This depicts 24-hour noise in the conventional mode of contour lines. It also shows the constituent events that contributed to the totals at selected sites. It also indicates the levels anywhere on the map area.

The Noise Mapping screen includes continuous pan and zoom capabilities. The zoom control is at the bottom of the aerial photo. Vertical and horizontal sliders appear at the side of the map image whenever the image exceeds the display area. An image can also be shifted by clicking within the map display area and holding the mouse button down to drag the image in the desired direction.

This screen is one of several that have a "full screen" option. A click on this button will extend the map image, covering the Menu Selections display. A click on the curled page graphic at the lower right of the display returns to the original image.

Clicking on the Choose Scenario or Choose Site boxes pops up a selection window. Choosing a Scenario will overlay the map image with noise contours (or flight tracks). The contours are imported from previously made INM or Noise Map forecasts. When a contour map is displayed, if the pointer is moved to any position on the map, the "pointer DNL" box will display the DNL level at that point. With the full screen option, a box showing the percent of annoyed persons is displayed next to the DNL level. The number is calculated using The Schultz Curve. Note: Multiple contours can be overlaid but the pointer is disabled (when more than one is displayed).

The Show Gradation box transforms the way the sound energy distribution is displayed. The initial map shows this with traditional noise contour lines. The alternative depicts the distribution with a color gradient. The contour and gradient maps rely on identical noise exposure data. The pointer, and other contours, functions the same on either map.

Contour/gradient maps can be developed to display other metrics such as L_max, SEL, Time Above or N70. It is possible to link the pointer with the sound producing features of the package. In this case a double-click on the map can produce a sound sample reproduced at the appropriate volume. Sounds heard will be appropriate in volume but not in character where they are distant from the standard listener location. The same flyover sounds are played for every location. Several sounds can be selected.

The popup for the program shows comparative sound levels at the selected location for a Lear 25 departure and a Lear 35 departure. Note that clicks on other locations will reduce/increase the volume to levels to fit each newly selected location. The volume of the recording will match the selection but the recording itself will not change with the listener position.

The Choose Site pop-up shows graphics depicting residential and public land uses. Either is selected by clicking within the square adjacent to the text. All of the pop-up selections for the program are indicated by small "X" symbols. A click on any of the map locations produces a popup showing a local photo and the LDN (or L_max) level at the position.

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