FerrousMinerals

Summary

Calculates the Ferrous Minerals (FM) ratio from a multiband raster object and returns a raster object with the index values.

Discussion

The Ferrous Minerals (FM) ratio method is a geological index for identifying rock features containing some quantity of iron-bearing minerals using the SWIR and NIR bands. FM is used in mineral composite mapping.

FM = SWIR / NIR

For information about other multiband raster indexes, see the Band Arithmetic 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

FerrousMinerals (raster, {swir_band_id}, {nir_band_id})

Parameter	Explanation	Data Type
raster	The input raster.	Raster
swir_band_id	The band ID of the shortwave infrared (SWIR) band. The band ID index uses one-based indexing. (The default value is 6)	Integer
nir_band_id	The band ID of the near-infrared band. The ID index uses one-based indexing. (The default value is 5)	Integer

Return Value

Data Type	Explanation
Raster	The output raster object with the Ferrous Minerals ratio values.

Code sample

FerrousMinerals example

Calculates the Ferrous Minerals ratio for a Sentinel-2 image.

import arcpy

FerrousMinerals_raster = arcpy.ia.FerrousMinerals("Sentinel2.tif", 11, 8)