Extract Subdataset (Data Management)

Summary

Extracts raster datasets stored within a subdataset raster file.

Usage

• This tool is useful since ArcCatalog is only able to preview the first subdataset within the parent file.

• Subdataset file formats can be either Hierarchical Data Format (HDF) or National Imagery Transmission Format (NITF) files

• The data structure allows the file format to consist of multiple datasets in one parent file. In addition, each of the subdatasets can consist of one band or multiple bands.

• If you do not choose any subdatasets, the default will be to only return the first subdataset.

• When storing your raster dataset to a JPEG or a JPEG 2000 file, you can specify the compression quality within the Raster Storage Settings in the Environment Settings dialog box.

• The GIF format does not support multiband; therefore, it is not a valid output format unless your raster dataset is single band.

Syntax

ExtractSubdataset_management (in_raster, out_raster, {subdataset_index})

Parameter	Explanation	Data Type
in_raster	The input subdataset raster format. Valid inputs can either be HDF or NITF files.	Raster Layer
out_raster	The name and extension of the raster dataset to be created. When storing the raster dataset in a file format, you need to specify the file extension: .bil—ESRI BIL .bip—ESRI BIP .bmp—BMP .bsq—ESRI BSQ .dat—ENVI DAT .gif—GIF .img—ERDAS IMAGINE file .jpg—JPEG .jp2—JPEG 2000 .png—PNG .tif—TIFF no extension—ESRI GRID. When storing a raster dataset in a geodatabase, no file extension should be added to the name of the raster dataset. When storing your raster dataset to a JPEG file, a JPEG 2000 file, a TIFF file, or a geodatabase, you can specify a compression type and compression quality.	Raster Dataset
subdataset_index [subdataset_index,...] (Optional)	Define the subdatasets that you want to extract.	Value Table

Code Sample

ExtractSubdataset example 1 (Python window)

This is a Python sample for ExtractSubdataset

import arcpy
arcpy.ExtractSubDataset_management("c:/data/MyNITF.ntf","extracted.tif", "2")

ExtractSubdataset example 2 (stand-alone script)

This is a Python script sample for ExtractSubdataset

##====================================
##Extract Subdataset
##Usage: ExtractSubdataset_management in_raster out_raster {ID;ID...}

try:
    import arcpy
    arcpy.env.workspace = r"C:/Workspace"
    
    ##Extract 3-band subdataset from HDF
    arcpy.ExtractSubDataset_management("MHDF.hdf", "subds.tif", "5;6;7")
    
    ##Extract 1-band subdataset from NITF
    arcpy.ExtractSubDataset_management("MNITF.ntf","subds_ntf.tif", "2")
except:
    print "Extract Subdataset example failed."
    print arcpy.GetMessages()

Environments

Compression, Current Workspace, NoData, Output CONFIG Keyword, Output Coordinate System, Extent, Pyramid, Raster Statistics, Resampling Method, Scratch Workspace, Snap Raster

Licensing Information

ArcGIS for Desktop Basic: Yes

ArcGIS for Desktop Standard: Yes

ArcGIS for Desktop Advanced: Yes