Available with Spatial Analyst license.
Evaluates on a cell-by-cell basis the number of times a set of rasters is greater than another raster.
An arbitrary number of rasters can be specified in the input rasters list.
When a multiband raster is specified for the Input value raster (in_value_raster in Python), only the first band will be used. To process a different band, specify the specific band to use.
When a multiband raster is specified as one of the Input rasters (in_rasters in Python), all the bands will be used.
To process a selection of bands from a multiband raster, you can first create a new raster dataset composed of those particular bands with the Composite Bands tool, and use the result in the list of the Input rasters (in_rasters 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.
See Analysis environments and Spatial Analyst for additional details on the geoprocessing environments that apply to this tool.
GreaterThanFrequency (in_value_raster, in_rasters)
For each cell location in the input value raster, the number of occurrences (frequency) where a raster in the input list has a greater value is counted.
The list of rasters that will be compared against the value raster.
The output raster.
For each cell in the output raster, the value represents the number of times that the corresponding cells in the list of rasters is greater than the value raster.
This example evaluates the number of times a set of input Grid rasters is greater than another raster and outputs the result as a TIFF raster.
import arcpy from arcpy import env from arcpy.sa import * env.workspace = "C:/sapyexamples/data" outGTF = GreaterThanFrequency("cost", ["degs", "negs", "fourgrd"]) outGTF.save("C:/sapyexamples/output/outgtf.tif")
This example evaluates the number of times a set of input Grid rasters is greater than another raster and outputs the result as a Grid raster.
# Name: GreaterThanFrequency_Ex_02.py # Description: Evaluates the number of times a set of rasters is # greater than another raster on a cell-by-cell basis # 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 inValueRaster = "cost" inRaster01 = "degs" inRaster02 = "negs" inRaster03 = "fourgrd" # Execute GreaterThanFrequency outGTF = GreaterThanFrequency(inValueRaster, [inRaster01, inRaster02, inRaster03]) # Save the output outGTF.save("C:/sapyexamples/output/outgtf")
- Basic: Requires Spatial Analyst
- Standard: Requires Spatial Analyst
- Advanced: Requires Spatial Analyst