How to read or extract modis HDF aerosol data .

Hi sir, i have written a code for read a modis hdf aerosol data. i did not read a data or see data in excel. will u check this code and tell me. i attach data set and code also.

% Open the HDF file and assign it a file ID.

modis_id=hdfsd('start','MOD08_M3.A2005001.051.2011046203433.hdf','read');

% Extract information about the file discription

[numdata, numdescr]= hdfsd('fileinfo', modis_id)

% Assigning dataset ID(S)

AODid = hdfsd ('select',modis_id,9) longid = hdfsd ('select',modis_id,0) latid=hdfsd('select', modis_id, 1)

 % Extracting infomation from Dataset

 [name,numdim,dimvector,type,numdescr]=hdfsd('getinfo',AODid)
 [name,numdim,dimvector,type,numdescr]=hdfsd('getinfo',longid)
 [name,numdim,dimvector,type,numdescr]=hdfsd('getinfo',latid)

 % Reading HDF datasets and importing into MatLAB

 startvector=[0 0];
 endvector=dimvector;
 stride=[];

 AODvar=hdfsd('readdata',AODid,startvector,stride,endvector);
 longvar=hdfsd('readdata',longid,startvector,stride,endvector);
 latvar=hdfsd('readdata',latid,startvector,stride,endvector);

thanks sir

[David Young]

Please edit the first few lines of code to make them readable like the rest. (Put two spaces at the start of each line.)

Answer 1

[Hyo-Kyung Lee]

Have you checked the following MODIS MATLAB example?

http://hdfeos.org/zoo/LAADS/MOD08_D3_Cloud_Fraction_Liquid.m

Answer 2

[David Young]

I've been using hdfinfo with 'eos' as the second argument and hdfread to read MOD10 files.

If you try that and still can't read the data, please could you give more details of what is wrong.

Answer 3

[Chad Greene]

I believe hdfsd is obsolete. Consider h5read instead.

[Hyo-Kyung Lee]

h5read is for HDF5 file. The MODIS file is HDF4 (HDF-EOS2) so h5read will not work.