Map and Table Calculation

ATAN2( ) function

Returns the angle in radians of two input values, i.e. the angle from the x-axis to a point (y,x).

Syntax

ATAN2(Value y, Value x)

Input

Output

Notes:

• For the function ATAN2, the output values are in radians. To convert radians to degrees, use the angular function RADDEG.
• When the input value is undefined, the output will also be undefined.

Tips:

• The ATAN2 function is often used in calculation of slope maps and aspect maps. See How to calculate an aspect map for more information.
• When the definition symbol = is used, a dependent output map or dependent output column is created; when the assignment symbol := is used, the dependency link is immediately broken after the output map/column has been calculated.

Usable in

MapCalc, TabCalc, Simple calculators

Examples

Pocket line calculator examples:

MapCalc example:

OutMap = ATAN2(DY,DX)

TabCalc example:

OutCol1 = ATAN2(DY,DX)

OutCol2 = RADDEG(ATAN2(DY,DX))

See also: