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enviinfo

Read metadata from ENVI header file

Since R2020a

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Syntax

info = enviinfo(file)

Description

info = enviinfo(file) reads the metadata from ENVI (Environment for Visualizing Images) header file.

Note

This function requires the Hyperspectral Imaging Library for Image Processing Toolbox™. You can install the Hyperspectral Imaging Library for Image Processing Toolbox from Add-On Explorer. For more information about installing add-ons, see Get and Manage Add-Ons.

The Hyperspectral Imaging Library for Image Processing Toolbox requires desktop MATLAB®, as MATLAB Online™ or MATLAB Mobile™ do not support the library.

example

Examples

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This example uses:

Open Live Script

Read an ENVI header file into the workspace.

info = enviinfo('paviaU.hdr');

Create a hypercube object using the Filename of the ENVI header file. 

hcube = hypercube(info.Filename)
hcube = 
  hypercube with properties:

      DataCube: [610×340×103 double]
    Wavelength: [103×1 double]
      Metadata: [1×1 struct]

This example uses:

Open Live Script

Read an ENVI header file into the workspace.

info = enviinfo('indian_pines');

Read from the ENVI binary data file by using the metadata from the ENVI header file.

data = multibandread('indian_pines.dat',...
    [info.Height info.Width info.Bands],...
    info.DataType,info.HeaderOffset,info.Interleave,info.ByteOrder);

Input Arguments

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Name of ENVI header file, specified as a string scalar or character vector. An ENVI header file must have the extension .hdr. If you do not specify a file extension, then the function looks for a file with the specified name and the .hdr file extension.

Data Types: char | string

Output Arguments

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Information about ENVI data and metadata from the header file, returned as a structure array. If the header file contains any of these fields, they must be in the specified format.

FieldDescription
HeightHeight of the image or number of rows in the image, returned as a positive integer.
WidthWidth of the image or number of columns in the image, returned as a positive integer.
BandsNumber of spectral bands, returned as a positive integer.
DataType

Data type of data in the ENVI file, returned as any of these values:

  • "single"

  • "double"

  • "uint8"

  • "uint16"

  • "int16"

  • "uint32"

  • "int32"

  • "uint64"

  • "int64"

Interleave

Data interleave, returned as any one of these values:

  • "bsq" — Band-sequential

  • "bil" — Band-interleaved-by-line

  • "bip" — Band-interleaved-by-pixel

HeaderOffsetZero-based location of the first element in the image file, returned as a positive integer. The header offset represents the number of bytes from the beginning of the image file to the start of the image data.
ByteOrderEndianness of the data, returned as the string "ieee-le" for little endian or "ieee-be" for big endian.

Version History

Introduced in R2020a

See Also

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