Summary
The CrossValidationResult class is returned by the Cross Validation tool and contains access to the cross-validation results that can be generated for any geostatistical layer.
Discussion
The CrossValidationResult class is similar to the Result class except for the additional read-only properties that it contains. For detailed help, see the Cross Validation tool.
Only the mean and root mean square error results are available for IDW, Global Polynomial Interpolation, Radial Basis Functions, Diffusion Interpolation With Barriers, and Kernel Interpolation With Barriers.
Properties
Property | Explanation | Data Type |
averageStandard (Read Only) | The average of the prediction standard errors. | Double |
count (Read Only) | The number of input samples. | Long |
inputCount (Read Only) | Returns the number of inputs. | Integer |
maxSeverity (Read Only) | Returns the maximum severity of the messages.
| Integer |
meanError (Read Only) | The averaged difference between the measured and the predicted values. | Double |
meanStandardized (Read Only) | Mean standardized error. | Double |
messageCount (Read Only) | Returns the number of messages. | Integer |
outputCount (Read Only) | Returns the number of outputs. | Integer |
resultID (Read Only) | Gets the job ID. If the tool is not a geoprocessing service, the resultID will be "". | String |
rootMeanSquare (Read Only) | The root mean square error. | Double |
rootMeanSquareStandardized (Read Only) | The root mean square standardized error should be close to 1 if the prediction standard errors are valid. If the root mean square standardized error is greater than 1, you are underestimating the variability in your predictions. If the root mean square standardized error is less than 1, you are overestimating the variability in your predictions. | Double |
status (Read Only) | Gets the job status.
| Integer |
Method Overview
Method | Explanation |
cancel () | Cancels an associated job |
getInput (index) | Returns a given input, either as a recordset or string. |
getMapImageURL ({parameter_list}, {height}, {width}, {resolution}) | Returns a map service image for a given output, if one exists. |
getMessage (index) | Returns a specific message by index position. |
getMessages ({severity}) | Returns the geoprocessing tool messages. |
getOutput (index) | Returns a given output, either as a string or a RecordSet. If the output of the tool, such as Make Feature Layer, is a layer, getOutput will return a Layer object. |
getSeverity (index) | Returns the severity of a specific message. |
Methods
cancel ()
getInput (index)
Parameter | Explanation | Data Type |
index | The index position of the input. | Integer |
Return Value
Data Type | Explanation |
Object | The input, either as a recordset or string. |
getMapImageURL ({parameter_list}, {height}, {width}, {resolution})
Parameter | Explanation | Data Type |
parameter_list | The parameters on which the map service image will be based. | Integer |
height | The height of the image. | Double |
width | The width of the image. | Double |
resolution | The resolution of the image. | Double |
Return Value
Data Type | Explanation |
String | The URL of the map image. |
getMessage (index)
Parameter | Explanation | Data Type |
index | The index position of the message. | Integer |
Return Value
Data Type | Explanation |
String | The geoprocessing message. |
getMessages ({severity})
Parameter | Explanation | Data Type |
severity | The type of messages to be returned.
Not specifying a severity level will return all types of messages. (The default value is 0) | Integer |
Return Value
Data Type | Explanation |
String | The geoprocessing tool messages. |
getOutput (index)
Parameter | Explanation | Data Type |
index | The index position of the outputs. | Integer |
Return Value
Data Type | Explanation |
Object | The output, either as a recordset or a string. If the output of the tool, such as Make Feature Layer, is a layer, getOutput will return a Layer object. Result outputs can also be accessed by index, so result.getOutput(0) and result[0] are equivalent. |
getSeverity (index)
Parameter | Explanation | Data Type |
index | The message index position. | Integer |
Return Value
Data Type | Explanation |
Integer | The severity of the specific message.
|
Code sample
CrossValidation (Python window)
Perform cross-validation on an input geostatistical layer.
import arcpy
arcpy.env.workspace = "C:/gapyexamples/data"
cvResult = arcpy.CrossValidation_ga("C:/gapyexamples/data/kriging.lyr")
print "Root Mean Square error = " + str(cvResult.rootMeanSquare)
CrossValidation (stand-alone script)
Perform cross-validation on an input geostatistical layer.
# Name: CrossValidation_Example_02.py
# Description: Perform cross validation on an input geostatistical layer.
# Requirements: Geostatistical Analyst Extension
# Import system modules
import arcpy
# Set environment settings
arcpy.env.workspace = "C:/gapyexamples/data"
# Set local variables
inLayer = "C:/gapyexamples/data/kriging.lyr"
# Check out the ArcGIS Geostatistical Analyst extension license
arcpy.CheckOutExtension("GeoStats")
# Execute CrossValidation
cvResult = arcpy.CrossValidation_ga(inLayer)
print "Root Mean Square error = " + str(cvResult.rootMeanSquare)