Range and Slant Range
Range shows the range along the curved Earth's surface relative to the "home" point
(usually set to be the radar).
1)
Slant shows the range along the radar beam.
1)
Not all displays have an associated Slant range because there may be no elevation
angle associated with the product. VIL is a good example. In these cases, the Slant is
displayed as 0.0.
Bearing
The bearing in degrees from the Home point to the cursor as measured clockwise
from true north.
Elevation
For products that have an associated elevation, this displays the elevation angle from
the home point to the cursor.
Any product that has a "height" also has an elevation (for example, PPI and CAPPI).
If the "home" point is relative to the radar, the elevation is the elevation angle of the
radar.
If the "home" point is not the radar, the elevation is the elevation angle that an
observer at that point would observe to see the cursor at its height.
Ground Height
Displays the height of the ground above sea level at the location of the cursor.
To use Ground Height, you must add Digital Elevation Model (DEM) data in GeoTi
format in the /usr/sigmet/dt directory with the filename dem.tif. The DEM data
should cover the geographical domain scanned by radars within the network. Good
quality DEM data in GeoTi format is available at, for example: http://
srtm.csi.cgiar.org.
You can use cursor with other tools such as the Loop or Track tools. However in some
cases, the mouse is reserved for other functions.
You can still get readouts from the cursor tool by displaying it first and then selecting
Track. The cursor is not displayed on the screen, but the readouts correctly reflect the
values where you are pointing.
1. Select the Cursor icon to display the tool.
You can move the cursor in the display by clicking your mouse, or dragging the cursor.
The values in the menu update as you move the cursor.
6.13.1
Selecting and Planting Home Points
You can define home points ( ) to measure the position of a weather radar feature
relative to a selected location.
For example, Thunderstorm located 120 km at 260° from the airport.
IRIS Product and Display User Guide M211319EN-H
230 RESTRICTED
To Next Page
Loading...