# Log10 (Spatial Analyst)

## Summary

Calculates the base 10 logarithm of cells in a raster.

## 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.

• If the input is a multiband raster, the output will be a multiband raster. The tool will perform the operation on each band in the input.

• In ArcPy, if the input is a multidimensional raster, all slices from all variables will be processed, and the output will be a multidimensional raster.

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

## Parameters

 Label Explanation Data Type Input raster or constant value Input values for which to find the base 10 logarithm.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

 Label Explanation Data Type Output raster The output raster.The cell values are the base 10 logarithm of the input values. Raster

Log10(in_raster_or_constant)
 Name Explanation Data Type in_raster_or_constant Input values for which to find the base 10 logarithm.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

 Name Explanation Data 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"

# Execute Log10
outLog10 = Log10(inRaster)

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

## Licensing information

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