Lowest Position (Spatial Analyst)
Summary
Determines on a cell-by-cell basis the position of the raster with the minimum value in a set of rasters.
Illustration
 |
OutRas = LowestPosition([InRas1, InRas2, InRas3]) |
Usage
-
An arbitrary number of rasters can be specified in the input rasters list.
-
The order of the input rasters is relevant for this tool.
-
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.
Syntax
| Parameter | 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 |
Return Value
| 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 |
Code Sample
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"
# Check out the ArcGIS Spatial Analyst extension license
arcpy.CheckOutExtension("Spatial")
# Execute LowestPosition
outLowestPosition = LowestPosition([inRaster01, inRaster02, inRaster03])
# Save the output
outLowestPosition.save("C:/sapyexamples/output/outlp")