Editing the names.gvar File

The names.gvar file is a configuration file that is used only with GVAR ingestors. It lists the GVAR descriptor file names and defines their sector boundaries (see the GVAR Descriptor Files description). Operators can edit this file to change descriptor boundaries if desired. Though most SDI GVAR ingestors have the same descriptors, each ingestor may define them differently via its names.gvar configuration file.

GVAR descriptors are used as search tools for locating GVAR images and their times for your geographical area of interest. For an image to be listed under a particular descriptor, it must include all of the sector area described by the descriptor's sector boundaries. This is a minimum requirement and some images may contain much more data than the descriptor indicates. For example, if you create a descriptor called WISC (Wisconsin) and set its sector boundaries just large enough to include all of the state of Wisconsin, WISC will contain any GVAR image that shows the entire state of Wisconsin. These images will include:

• all full disk images from GOES 8 and GOES 9
• all northern hemisphere images from GOES 8 and GOES 9
• all USA images from GOES 8 and GOES 9
• any other images from GOES 8 and GOES 9 that includes all of Wisconsin

To change descriptor names or their boundaries, perform the following procedure.

1. Turn on the SDI computer if it is currently off.

2. From the console, login as root or telnet into the ingestor as root.

3. Edit the file /data/names.gvar .

The first line in the file must always be

ALL 0 0 0 0

The last line in file must always be

OTHER 1 0 0 0

The format of the file is: descriptor_name sline eline sele eele

Where:

The table below is a sample GVAR descriptor file

Table 3-1: Sample Descriptor File Format (fields are space delimited)

ALL 0 0 0 0 CONUS 3200 6200 11000 16000 NH 2850 7400 11000 20000 SH 10400 11500 11000 12000 FD 2800 11500 11000 20000 FD-E 2800 11500 4000 24000 FD-W 2800 11500 6000 26000 NH 2850 7400 11000 20000 OTHER 1 0 0 0

Example:

Using the names.gvar file above, any image that completely covers the area from image lines 3200 to 6200, and image elements 11000 to 16000 is listed in the descriptor file named CONUS .

4. Save the file.