How to read binary file or GrADS

Question

peterhack 2016-11-7

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https://ww2.mathworks.cn/matlabcentral/answers/311105-how-to-read-binary-file-or-grads

回答： Ramakrishna reddy Pareddy 2019-3-25

Hey guys,

I want to extract sattelite data from a binary file , where also a GrADS is provided. The manual says one could get the data by executing the following Fortran code:

name = “xxx.bin” 
nlines = 180; ncolumns= 180; ntime= 803 
size = nlines * ncolumns * ntime 
REAL   G(nlines, ncolumns, ntime) 
OPEN (1, FILE= name, ACCESS= “direct”, FORM= “unformatted” RECL= 4*size) 
READ (1,REC=1) G 
CLOSE (1)

However, could someone give me assistance on translating this to MATLAB? I have also tried the GrADS - Matlab Interface , but the data variable did not contain anything.

Many thanks!

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Answer 1

Ramakrishna reddy Pareddy 2019-3-25

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https://ww2.mathworks.cn/matlabcentral/answers/311105-how-to-read-binary-file-or-grads#answer_367199

how to read .grd format file in matlab not ascii.grd file please provide me code

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Answer 2

KSSV 2016-11-8

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在 MATLAB Online 中打开

Below one is the rough translation of your fortran code. I am not sure whether the below works or not. You read about fread to know more about reading the binary files. Let me know whether the below one worked. If it shows error, try to attach one binary file, so that I can change the code and see.

clc; clear all ;
filename = 'GL12g_AS_04pentad_V02.bin' ;
m = 180; n = 180; p = 803 ; 
t= m*n*p ;
fid = fopen(filename) ;
G = fread(fid,t,'double') ; % try uint16 etc if double fails 
fclose(fid) ;