ENVI file reader/writer

Mini-toolbox for reading and writing ENVI data and header files (including complex).

Description

%test script

%clears workspace
clearvars;

%generate a complex 3-D variable
D=rand(2,3,4)+j*rand(2,3,4);

%create basic ENVI header info about a Matlab variable
info=enviinfo(D);

%write the variable and the associated header info in a pair of binary/header ENVI files
enviwrite(D,info,'a.dat'); %implicit header file is "a.dat.hdr" (if not explicitly passed)

%read a complex n-D variable from "a.dat" and "a.dat.hdr" ENVI files
[D2,info2]=enviread('a.dat');

%some comparisons to validate consistency of our read/write procedures
isequal(D,D2)
isequal(info,info2)

%modify the header info (introducing offset in ENVI header)
info3=info2;
info3.header_offset=10000;
D3=D2; %same as D2

%writing the D3 (same as D2), but with 10000 offset
enviwrite(D3,info3,'a3.dat');

%read the offset variable (D3)
[D3a,info3a]=enviread('a3.dat');

%comparisons to validate read/write
isequal(D3,D3a)
isequal(info3,info3a)

Acknowledgements

The author wishes to acknowledge the following in the creation of this submission:
ENVI to MATLAB, MATLAB to ENVI, ENVI file reader, updated 2/9/2010, READ_ENVIHDR

• MATLAB release: MATLAB 7 (R14)

[Margaret]

Very useful for importing ENVI standard files into Matlab as well as outputing the results from a Matlab analysis back to ENVI! Runs fast - no compatibility issues with large files.

[Jaroslaw Tuszynski]

A better option is to use MATLAB's multibandread function

[Felix Totir]

@Jaroslaw Tuszynski: The provided function envidataread.m is esentially a wrapper around multibandread(). Even a hint towards multibandread is given in the comments on lines 88 and 90 of that function (please have a look at the code).

However, using multibandread alone requires *reading the header by a human*. The purpose of this little toolbox is exactly to automatize that operation (working with headers and data).