Navigation

The navigation system overview and file naming conventions are described below.

Overview

GVAR navigation is filed in the McIDAS SYSNAV file format. The SDI Event System is configured to execute /usr/local/bin/sysnav.sh at the start of a new image. This program reads the navigation information from the current image and files navigation if either of the following conditions are true:

this is the first image of a new day
the navigation in the current image differs from the navigation of the most recently filed navigation

File Naming Convention

The naming convention of the McIDAS SYSNAV files for GVAR is:

/navigation/SYSNAVYYSS

Where:

YY is the julian year of the navigation

SS is the McIDAS sensor source number of the satellite

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