6.14.3 Adding and Deleting Tracking and Annotation Icons
1. To add an icon such as an airport or thunderstorm symbol:
a. Select Action > Add Icon.
b. Use the Icon button to select the type of icon.
Usually the name suggests what the icon is.
c. Use Color selection to select the icon color.
d. Position the cursor (now shaped like your icon) on the screen and click.
2. To delete an icon:
a. Select Action > Delete
b. Select the icon to be removed.
3. To create your own icons, use a program such as Paint (on a PC) or Kiconedit (on a
Linux system).
Icons are .xbm format bit-mapped icons which are stored in the /usr/ sigmet/
config/overlay directory.
To get you started, Vaisala provides several sample icons.
6.14.4
Tracking Typhoons With the Add Spiral Option
Use this mode to determine the location of a typhoon center, and to calculate the maximum
rotational winds. Even if the center is out of range of the radar scan, you may be able to line-
up the spiral line with the observed data to determine the center.
IRIS Product and Display User Guide M211319EN-H
238 RESTRICTED
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