Available with Spatial Analyst license.
Available with Image Analyst license.
Summary
Generates an Esri classifier definition file (.ecd) using the Support Vector Machine (SVM) classification definition.
Usage
The SVM classifier is a supervised classification method. It is well suited for segmented raster input but can also handle standard imagery. It is a classification method commonly used in the research community.
For standard image inputs, the tool accepts multiband imagery with any bit depth, and it will perform the SVM classification on a pixel basis, based on the input training feature file.
For segmented rasters that have their key property set to Segmented, the tool computes the index image and associated segment attributes from the RGB segmented raster. The attributes are computed to generate the classifier definition file to be used in a separate classification tool. The attributes for each segment can be computed from any Esri-supported image.
There are several advantages to using the SVM classifier rather than the maximum likelihood classification method:
- The SVM classifier needs fewer samples and does not require the samples to be normally distributed.
- It is less susceptible to noise, correlated bands, and an unbalanced number or size of training sites within each class.
Any Esri-supported raster is accepted as input, including raster products, segmented rasters, mosaics, image services, or generic raster datasets. Segmented rasters must be 8-bit rasters with 3 bands.
To create the training sample file, use the Training Samples Manager pane from the Classification Tools drop-down menu.
The Segment Attributes parameter is enabled only if one of the raster layer inputs is a segmented image.
To classify time series raster data using the Continuous Change Detection and Classification (CCDC) algorithm, first run the Analyze Changes Using CCDC tool and use the output change analysis raster as the input raster for this training tool.
The training sample data must have been collected at multiple times using the Training Samples Manager. The dimension value for each sample is listed in a field in the training sample feature class, which is specified in the Dimension Value Field parameter.
Syntax
TrainSupportVectorMachineClassifier(in_raster, in_training_features, out_classifier_definition, {in_additional_raster}, {max_samples_per_class}, {used_attributes}, {dimension_value_field})| Parameter | Explanation | Data Type |
in_raster | The raster dataset to classify. The preferred input is a 3-band, 8-bit segmented raster dataset in which all the pixels in the same segment have the same color. The input can also be a 1-band, 8-bit grayscale segmented raster. If no segmented raster is available, you can use any Esri-supported raster dataset. | Raster Layer; Mosaic Layer; Image Service; String |
in_training_features | The training sample file or layer that delineates the training sites. These can be either shapefiles or feature classes that contain your training samples. The following field names are required in the training sample file:
| Feature Layer |
out_classifier_definition | The output JSON file that contains attribute information, statistics, hyperplane vectors, and other information for the classifier. An .ecd file is created. | File |
in_additional_raster (Optional) | Ancillary raster datasets, such as a multispectral image or a DEM, are incorporated to generate attributes and other required information for classification. This parameter is optional. | Raster Layer; Mosaic Layer; Image Service; String |
max_samples_per_class (Optional) | The maximum number of samples to use for defining each class. The default value of 500 is recommended when the inputs are nonsegmented rasters. A value that is less than or equal to 0 means that the system will use all the samples from the training sites to train the classifier. | Long |
used_attributes [used_attributes;used_attributes,...] (Optional) | Specifies the attributes to be included in the attribute table associated with the output raster.
This parameter is only enabled if the Segmented key property is set to true on the input raster. If the only input to the tool is a segmented image, the default attributes are COLOR, COUNT, COMPACTNESS, and RECTANGULARITY. If an in_additional_raster is included as an input with a segmented image, MEAN and STD are also available attributes. | String |
dimension_value_field (Optional) | Contains dimension values in the input training sample feature class. This parameter is required to classify a time series of raster data using the change analysis raster output from the Analyze Changes Using CCDC tool. | Field |
Code sample
This Python example uses the SVM classifier to classify a segmented raster.
import arcpy
from arcpy.ia import *
# Check out the ArcGIS Image Analyst extension license
arcpy.CheckOutExtension("ImageAnalyst")
TrainSupportVectorMachineClassifier("c:/test/moncton_seg.tif", "c:/test/train.gdb/train_features", "c:/output/moncton_sig_SVM.ecd", "c:/test/moncton.tif",
"10", "COLOR;MEAN;STD;COUNT;COMPACTNESS;RECTANGULARITY")This Python script uses the SVM classifier to classify a segmented raster.
# Import system modules
import arcpy
from arcpy.ia import *
""" 'TrainSupportVectorMachineClassifier(in_raster, in_training_features, out_classifier_definition, {in_additional_raster},
{max_num_samples_per_class}, {used_attributes})
"""
# Set local variables
inSegRaster = "c:/test/moncton_seg.tif"
train_features = "c:/test/train.gdb/train_features"
out_definition = "c:/output/moncton_sig.ecd"
in_additional_raster = "c:/moncton.tif"
maxNumSamples = "10"
attributes = "COLOR;MEAN;STD;COUNT;COMPACTNESS;RECTANGULARITY"
# Check out the ArcGIS Image Analyst extension license
arcpy.CheckOutExtension("ImageAnalyst")
#Execute
TrainSupportVectorMachineClassifier(inSegRaster, train_features, out_definition, in_additional_raster,
maxNumSamples, attributes)This Python script uses the SVM classifier to classify a time series multidimensional raster using the output from the Analyze Changes Using CCDC tool.
# Import system modules
import arcpy
from arcpy.ia import *
# Check out the ArcGIS Image Analyst extension license
arcpy.CheckOutExtension("ImageAnalyst")
# Define input parameters
in_changeAnalysisRaster = "c:/test/LandsatCCDC.crf"
train_features = "c:/test/train.gdb/train_features"
out_definition = "c:/output/change_detection.ecd"
additional_raster = ''
attributes = None
dimension_field = "DateTime"
# Execute
arcpy.ia.TrainSupportVectorMachineClassifier(
in_changeAnalysisRaster, train_features, out_definition,
additional_raster, attributes, dimension_field)Environments
Licensing information
- Basic: Requires Image Analyst or Spatial Analyst
- Standard: Requires Image Analyst or Spatial Analyst
- Advanced: Requires Image Analyst or Spatial Analyst