ArcMap

Export Training Data For Deep Learning

Available with Spatial Analyst license.

Summary

Uses a remote sensing image to convert labeled vector or raster data into deep learning training datasets. The output is a folder of image chips and a folder of metadata files in the specified format.

Usage

  • This tool will create training datasets to support third-party deep learning applications, such as Google TensorFlow, PyTorch, or Microsoft CNTK.

  • Deep learning class training samples are based on small subimages containing the feature or class of interest, called image chips.

  • Use your existing classification training sample data, or GIS feature class data such as a building footprint layer, to generate image chips containing the class sample from your source image. Image chips are often 256 pixel rows by 256 pixel columns, unless the training sample size is larger.

  • The cell size and extent can be adjusted using the geoprocessing environment settings.

Syntax

ExportTrainingDataForDeepLearning(in_raster, out_folder, in_class_data, image_chip_format, {tile_size_x}, {tile_size_y}, {stride_x}, {stride_y}, {output_nofeature_tiles}, {metadata_format}, {start_index}, {class_value_field}, {buffer_radius})
ParameterExplanationData Type
in_raster

The input source imagery, typically multispectral imagery.

Examples of the type of input source imagery include multispectral satellite, drone, aerial, or National Agriculture Imagery Program (NAIP).

Raster Dataset; Raster Layer; Mosaic Layer; Image Service; MapServer; Map Server Layer; Internet Tiled Layer
out_folder

The folder where the output image chips and metadata will be stored.

Folder
in_class_data

The training sample data, in either vector or raster form.

Vector inputs should follow a training sample format as generated by the ArcGIS Desktop Image Classification toolbar. Raster inputs should follow a classified raster format as generated by the Classify Raster tool.

Feature Class; Feature Layer; Raster Dataset; Raster Layer; Mosaic Layer; Image Service
image_chip_format

Specifies the raster format for the image chip outputs.

PNG and JPEG support up to 3 bands.

  • TIFF —TIFF format
  • PNG —PNG format
  • JPEG —JPEG format
  • MRF —MRF (Meta Raster Format)
String
tile_size_x
(Optional)

The size of the image chips for the X dimension.

Long
tile_size_y
(Optional)

The size of the image chips for the Y dimension.

Long
stride_x
(Optional)

The distance to move in the X direction when creating the next image chips.

When stride is equal to tile size, there will be no overlap. When stride is equal to half the tile size, there will be 50 percent overlap.

Long
stride_y
(Optional)

The distance to move in the Y direction when creating the next image chips.

When stride is equal to tile size, there will be no overlap. When stride is equal to half the tile size, there will be 50 percent overlap.

Long
output_nofeature_tiles
(Optional)

Specifies whether image chips that do not capture training samples will be exported.

  • ALL_TILES —All image chips, including those that do not capture training samples, will be exported.
  • ONLY_TILES_WITH_FEATURES —Only image chips that capture training samples will be exported. This is the default.
Boolean
metadata_format
(Optional)

Specifies the format of the output metadata labels.

The four options for output metadata labels for the training data are KITTI rectangles, PASCAL VOC rectangles, Classified Tiles (a class map), and RCNN Masks. If your input training sample data is a feature class layer, such as a building layer or standard classification training sample file, use the KITTI or PASCAL VOC rectangles option. The output metadata is a .txt file or .xml file containing the training sample data contained in the minimum bounding rectangle. The name of the metadata file matches the input source image name. If your input training sample data is a class map, use the Classified Tiles option as your output metadata format.

  • KITTI_rectangles —The metadata follows the same format as the Karlsruhe Institute of Technology and Toyota Technological Institute (KITTI) Object Detection Evaluation dataset. The KITTI dataset is a vision benchmark suite. This is the default.The label files are plain text files. All values, both numerical and strings, are separated by spaces, and each row corresponds to one object.
  • PASCAL_VOC_rectangles —The metadata follows the same format as the Pattern Analysis, Statistical Modeling and Computational Learning, Visual Object Classes (PASCAL_VOC) dataset. The PASCAL VOC dataset is a standardized image dataset for object class recognition.The label files are XML files and contain information about image name, class value, and bounding boxes.
  • Classified_Tiles —The output will be one classified image chip per input image chip. No other metadata for each image chip is used. Only the statistics output has more information on the classes, such as class names, class values, and output statistics.
  • RCNN_Masks —The output will be image chips that have a mask on the areas where the sample exists. The model generates bounding boxes and segmentation masks for each instance of an object in the image. It's based on Feature Pyramid Network (FPN) and a ResNet101 backbone in the deep learning framework model.

For the KITTI metadata format, 15 columns are created, but only 5 of them are used in the tool. The first column is the class value. The next 3 columns are skipped. Columns 5-8 define the minimum bounding rectangle, which is comprised of 4 image coordinate locations: left, top, right, and bottom pixels, respectively. The minimum bounding rectangle encompasses the training chip used in the deep learning classifier. The remaining columns are not used.

For more information, see KITTI metadata format KITTI metadata.

The following is an example of the PASCAL VOC option:

<?xml version=”1.0”?>
- <layout>
      <image>000000000</image>
      <object>1</object>
    - <part>
         <class>1</class>
       - <bndbox>
            <xmin>31.85</xmin>
            <ymin>101.52</ymin>
            <xmax>256.00</xmax>
            <ymax>256.00</ymax>
         </bndbox>
      </part>
  </layout>

For more information, see PASCAL Visual Object ClassesPASCAL Visual Object Classes.

String
start_index
(Optional)

The start index for the sequence of image chips. This allows you to append more image chips to an existing sequence. The default value is 0.

Long
class_value_field
(Optional)

The field that contains the class values. If no field is specified, the system searches for a value or classvalue field. If the feature does not contain a class field, the system determines that all records belong to one class.

Field
buffer_radius
(Optional)

The radius for a buffer around each training sample to delineate a training sample area. This allows you to create circular polygon training samples from points.

The linear unit of the in_class_data spatial reference is used.

Double

Code sample

ExportTrainingDataForDeepLearning example 1 (Python window)

This example creates training samples for deep learning.

from arcpy.sa import *

ExportTrainingDataForDeepLearning("c:/test/image.tif", "c:/test/outfolder", 
                                 "c:/test/training.shp", "TIFF", "256", 
                                 "256", "128", "128", "NO", "KITTI_rectangles")
ExportTrainingDataForDeepLearning example 2 (stand-alone script)

This example creates training samples for deep learning.

# Import system modules and check out ArcGIS Spatial Analyst extension license
import arcpy
arcpy.CheckOutExtension("Spatial")
from arcpy.sa import *

# Set local variables
inRaster = "c:/test/image.tif"
out_folder = "c:/test/outfolder"
in_training = "c:/test/training.shp"
image_chip_format = "TIFF"
tile_size_x = "256"
tile_size_y = "256"
stride_x="128"
stride_y="128"
output_nofeature_tiles="NO"
metadata_format="KITTI_rectangles"

# Execute 
ExportTrainingDataForDeepLearning(inRaster, out_folder, in_training, 
                                 image_chip_format,tile_size_x, tile_size_y, 
                                 stride_x, stride_y,output_nofeature_tiles, 
                                 metadata_format)

Environments

Licensing information

  • Basic: Requires Spatial Analyst
  • Standard: Requires Spatial Analyst
  • Advanced: Requires Spatial Analyst

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