nodirection

nodirection

Expression of directional data type

Result = nodirection(expression)

expression

spatial, non spatial directional

Result

dimension of expression boolean

Operation

The expression cell values represent directions, with values equal to 0 or between 0 and 360 (or 2 pi if the global option --radians is set). A cell with no direction (a flat area) has a value -1. Result is a Boolean expression where 1 is TRUE for cells with no direction and 0 is FALSE for cells with a direction.

Each cell without a direction on expression is assigned a 1 (Boolean TRUE) on Result. Cells that have a direction on expression are assigned a 0 (Boolean FALSE) on Result.

Notes

Group

This operation belongs to the group of Missing value creation

See Also

aspect, slope

Examples

1. • pcrcalc

   binding

   Result = Result.map;

   Expr = Expr.map;

   initial

   report Result = nodirection(Expr);

   
   

   • python

   Expr = readmap(“Expr.map”)

   Result = nodirection(Expr)

   Result.map	Expr.map