ArcMap

Log10

Available with Spatial Analyst license.

Summary

Calculates the base 10 logarithm of cells in a raster.

Illustration

Log10 illustration
OutRas = Log10(InRas1)

Usage

  • The input can be of integer or float type.

    You can review some results for floating-point input values in the examples of output values from the Logarithmic tools.

  • Input values that are 0 or negative will be NoData in the output raster.

  • The output raster from this tool is always floating-point type, regardless of the input value type.

  • See Analysis environments and Spatial Analyst for additional details on the geoprocessing environments that apply to this tool.

Syntax

Log10(in_raster_or_constant)
ParameterExplanationData Type
in_raster_or_constant

Input values for which to find the base 10 logarithm.

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

Return Value

NameExplanationData Type
out_raster

The output raster.

The cell values are the base 10 logarithm of the input values.

Raster

Code sample

Log10 example 1 (Python window)

This example calculates base 10 logarithm of the input raster values and generates the output as an IMG raster.

import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
outLog10 = Log10("elevation")
outLog10.save("C:/sapyexamples/output/outlog10.img")
Log10 example 2 (stand-alone script)

This example calculates base 10 logarithm of the input raster values.

# Name: Log10_Ex_02.py
# Description: Calculates the base 10 logarithm 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 Log10
outLog10 = Log10(inRaster)

# Save the output 
outLog10.save("C:/sapyexamples/output/outlog10")

Environments

Licensing information

  • Basic: Requires Spatial Analyst
  • Standard: Requires Spatial Analyst
  • Advanced: Requires Spatial Analyst

Related topics