Available with Spatial Analyst license.
Determines on a cell-by-cell basis the position of the raster with the minimum value in a set of rasters.
An arbitrary number of rasters can be specified in the input rasters list.
The order of the input rasters is relevant for this tool.
When a multiband raster is specified as one of the Input rasters or constant values parameter values (in_rasters_or_constants in Python), all the bands will be used.
To process a selection of bands from a multiband raster, first create a raster dataset composed of those particular bands using the Composite Bands tool; then use the result in the list in the Input rasters or constant values parameter (in_rasters_or_constants in Python).
If a cell location contains NoData on any of the input rasters, that location will be assigned NoData on the output.
The output raster is always of integer type.
If two or more input rasters contain the minimum value for a particular cell location, the position of the first one encountered is returned on the output raster.
In ArcPy, if all inputs are multidimensional rasters with the same number of variables, the tool will perform the operation for all slices with the same dimension value, and the output will be a multidimensional raster. The variables in the inputs must have the same dimensions or common dimensions.
If all of the inputs are multidimensional rasters with one variable but different names, set the matchMultidimensionalVariable geoprocessing environment to False to perform the operation.
In ArcPy, if one or more of the inputs is a multidimensional raster and the other input is a constant, the tool will perform the operation for all slices for all variables using the constant value, 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.
| Label | Explanation | Data Type |
Input rasters or constant values | The list of input rasters for which the position of the input with the lowest value will be determined. A number can be used as an input; however, the cell size and extent must first be set in the environment. | Raster Layer; Constant |
| Label | Explanation | Data Type | Output raster | The output raster. For each cell in the output raster, the value represents the position of the raster with the lowest value. | Raster |
LowestPosition(in_rasters_or_constants)
| Name | Explanation | Data Type |
in_rasters_or_constants [in_raster_or_constant,...] | The list of input rasters for which the position of the input with the lowest value will be determined. A number can be used as an input; however, the cell size and extent must first be set in the environment. | Raster Layer; Constant |
| Name | Explanation | Data Type | out_raster | The output raster. For each cell in the output raster, the value represents the position of the raster with the lowest value. | Raster |
This example evaluates several input rasters and returns as an output value the position in the list of the raster with the minimum value.
import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
outLowestPosition = LowestPosition(["degs", "negs", "fourgrd"])
outLowestPosition.save("C:/sapyexamples/output/outlp.tif")This example evaluates several input rasters and returns as an output value the position in the list of the raster with the minimum value.
# Name: LowestPosition_Ex_02.py
# Description: Determines the position of a raster with the minimum
# value in a set of rasters
# 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
inRaster01 = "degs"
inRaster02 = "negs"
inRaster03 = "fourgrd"
# Execute LowestPosition
outLowestPosition = LowestPosition([inRaster01, inRaster02, inRaster03])
# Save the output
outLowestPosition.save("C:/sapyexamples/output/outlp")