Available with Spatial Analyst license.
Calculates the inverse tangent of cells in a raster.
In mathematics, all Trigonometric functions have a defined range of valid input values, called the domain. The output values from each function also has a defined range. For this tool
The Domain is : -∞ < [in_value] < ∞
The Range is : -pi/2 ≤ [out_value] ≤ pi/2
Note that here -∞ and ∞ represent the smallest negative and largest positive value supported by the particular raster format, respectively.
The input values to this tool are interpreted as unitless.
Output values are always floating point, regardless of the input data type.
The output values from this tool are in radians. If degrees are desired, the resulting raster must be multiplied by the radians-to-degrees conversion factor of 180/pi, or approximately 57.296.
For further assistance, a procedure to follow and some examples of converting output in radians to degrees are available.
See Analysis environments and Spatial Analyst for additional details on the geoprocessing environments that apply to this tool.
The input for which to calculate the inverse tangent values.
In order to use a number as an input for this parameter, the cell size and extent must first be set in the environment.
|Raster Layer | Constant|
The output raster.
The values are the inverse tangent of the input values.
ATan example 1 (Python window)
This example calculates the inverse tangent of the values in the input Grid raster.
import arcpy from arcpy import env from arcpy.sa import * env.workspace = "C:/sapyexamples/data" outATan = ATan("degs") outATan.save("C:/sapyexamples/output/outatan")
ATan example 2 (stand-alone script)
This example calculates the inverse tangent of the values in the input Grid raster and outputs a TIFF raster.
# Name: ATan_Ex_02.py # Description: Calculates the inverse tangent of cells in a raster # Requirements: Spatial Analyst Extension # Import system modules import arcpy from arcpy import env from arcpy.sa import * # Set environment settings env.workspace = "C:/sapyexamples/data" # Set local variables inRaster = "degs" # Check out the ArcGIS Spatial Analyst extension license arcpy.CheckOutExtension("Spatial") # Execute ATan outATan = ATan(inRaster) # Save the output outATan.save("C:/sapyexamples/output/outatan.tif")
- ArcGIS for Desktop Basic: Requires Spatial Analyst
- ArcGIS for Desktop Standard: Requires Spatial Analyst
- ArcGIS for Desktop Advanced: Requires Spatial Analyst