The "rank" of segments within a file is an indication of what the segment depicts:
In "Boundary" files (bdy):
01 Demarcated or delimited boundary
02 Indefinite or in Dispute
03 Other line of separation of sovreignty on land
In "Coast, Islands and Lakes" files (cil)
01 Coast, islands and lakes that appear on all maps
02 Additional major islands and lakes
03 Intermediate islands and lakes
04 Minor islands and lakes
06 Intermittent major lakes
07 Intermittent minor lakes
09 Salt pans -- major
10 Salt pans -- minor
13 Ice Shelves -- major
14 Ice Shelves -- minor
In "Rivers" files (riv)
01 Permanent major rivers
02 Additional major rivers
03 Additional rivers
04 Minor rivers
05 Double lined rivers
06 Intermittent rivers -- major
07 Intermittent rivers -- additional
08 Intermittent rivers -- minor
10 Major canals
11 Canals of lesser importance
12 Canals -- irrigation type
Wrangell Island, off the coast of Siberia, seems to have been damaged by a bug in the data compaction program. .PP Additionally, a file 'earth_elevation' can be read that contains the elevation data of the world at 0.5 degree intervals. This will only be read if the user requests elevation display.
Optional: This port is optional
The colormap for the specific vectors. If the color is black, that section is not traversed. The numbering is : 0- 2 bdy 3- 5 pby 6-20 cil 21-32 riv .PP If no colormap is present, then the following defaults will be used: bdy1 = red pby1 = green cil1 = blue
everything else is black
Name of the directory containing the map files. The map files are bdy.cbd, pby.cbd, cil.cbd, and riv.cbd.
This widget controls teh resolution of the data extracted from the database. A high number means more data, higher quality, and slower.
Type: Option Menu
This controls the type of map plotted. The user can choose either a rectangular map with longitude lines equidistant, or a round globe. The elevation data can additionally be read in from a file called 'earth_elevation' and displayed.
Port: Z scale
This controls the scale of the elevation data if requested.
Port: Map Geometry