Slope

Summary

Represents the rate of change of elevation for each pixel.

Discussion

For more information about how this function works, see the Slope raster function.

The referenced raster dataset for the raster object is temporary. To make it permanent, you can call the raster object's save method.

Syntax

Slope (dem, {z_factor}, {slope_type}, {ps_power}, {psz_factor}, {remove_edge_effect})

Parameter	Explanation	Data Type
dem	The input elevation raster.	Raster
z_factor	The z-factor is a scaling factor used to convert the elevation values for the following purposes: Convert the elevation units (such as meters or feet) to the horizontal coordinate units of the dataset, which may be feet, meters, or degrees. Add vertical exaggeration for visual effect. If the x,y units and z units are in the same units of measure, the z-factor should be set to 1. The z-values of the input surface are multiplied by the z-factor when calculating the final output surface. (The default value is 1)	Double
slope_type	The inclination of slope can be output as either a value in degrees or percent rise. Specify one of the following: DEGREE, PERCENTRISE, or SCALED. For more information, see Slope function. (The default value is DEGREE)	String
ps_power	Accounts for the altitude changes (or scale) as the viewer zooms in and out on the map display. It is the exponent applied to the pixel size term in the equation that controls the rate at which the z-factor changes to avoid significant loss of relief. This parameter is only valid when slope_type is SCALED. (The default value is 0.664)	Double
psz_factor	Accounts for changes in scale as the viewer zooms in and out on the map display. The value controls the rate at which the z-factor changes. This parameter is only valid when slope_type is SCALED. (The default value is 0.024)	Double
remove_edge_effect	Using this option will avoid any resampling of artifacts that may occur along the edges of a raster. The output pixels along the edge of a raster or next to pixels without a value will be populated with NoData. It is recommended that you use this option only when there are other rasters with overlapping pixels available. When overlapping pixels are available, these areas of NoData will display the overlapping pixel values instead of being blank. False—Bilinear resampling will be applied uniformly to resample the output. True—Bilinear resampling will be used to resample the output, except along the edges of the rasters or next to pixels of NoData. These pixels will be populated with NoData. This will reduce any sharp edge effects that may otherwise occur. (The default value is False)	Boolean

Return Value

Data Type	Explanation
Raster	The output raster.

Code sample

Slope example 1

This example calculates the slope for a given elevation.

from arcpy.ia import *
out_slope_raster = Slope("elevation.tif")
out_slope_raster.save("C:/arcpyExamples/outputs/slope.tif")

Slope example 2

This example calculates the slope for a given elevation.

# Import the system modules
import arcpy
from arcpy.ia import *

# Set the analysis environments
arcpy.env.workspace = "C:/arcpyExamples/data"

# Set the local variables
in_dem = "elevation.tif"

# Execute the Slope function
out_slope_raster = Slope(in_raster)

# Save the output
out_slope_raster.save("C:/arcpyExamples/outputs/slope.tif")