Byte output is the default.
For 2-D the default data number for polygon borders is 255; for 3-D files the dn's are set to the z-values, unless DN is explicitly set.
The default data number for background areas is 0.
The default data number for polygon corners (endpoints of line segments) is the value for the DN parameter.
The APCLOSE distances are entered when the program is to check for polygons which close approximately (to within the APCLOSE distances) when determining the end of sequences of points in the input file. The first value gives the vertical distance in units of lines. The second value gives the horizontal distance in units of pixels. Both values are real numbers. The program checks that both the vertical and horizontal distances are less than or equal to the APCLOSE parameters. If only one APCLOSE parameter is entered, the value is used for both horizontal and vertical distances.
This option is used when the polygon borders specified in the input file
are to be included as part of the interior of the polygons and the actual
borders are to be drawn around the outside of the specified polygon
borders. If this option is used the points of the polygon must be
listed in the input file in clockwise ('right hand coded') order.
This is because each line segment will be shifted over one pixel to the
left (perpendicularly when looking towards the ending point from the
starting point of the segment).
Supresses program messages output to the screen.
The default coordinates used to denote a null point are (0.0,0.0). A null point in the input file signifies the end of a sequence of points to be connected by line segments. A null point is analogous to a pen-up command for a plotter.