[gdal-dev] RE: How to get some special metadata of HDF5 Cosmo-Skymed file

[Alex Mantaut]

To be honest I know nothing about radiation calibration... Did you
checked out this document?

http://www.e-geos.it/products/pdf/COSMO-SkyMed-Image_Calibration.pdf

other relevant information can be found at:

http://www.e-geos.it/products/cosmo.html

Hope it helps!
Regards

2011/7/11 RSyaoxin <RSyaoxin at hotmail.com>:
> Thanks Antonio Valentino and Alex Mantaut. I've got these parameters.I have
> a new problem,I need to get the backscatter image,but the calibration result
> is not correct,the calibrated image pixels are all zero.I doubt that my
> method is not correct.Who can give me some information about Cosmo-Skymed
> radiation calibration?How should I do?
> Best regards.
>
>
> ________________________________
> Date: Mon, 11 Jul 2011 06:55:54 -0700
> From: [hidden email]
> To: [hidden email]
> Subject: Re: How to get some special metadata of HDF5 Cosmo-Skymed file
>
> Hi RSyaoxin,
>
> Antonio is right, there was an issue on geting the root metadata from
> hdf5 files and is has been fixed in trunk, you will need to recompile
> gdal in order to get that information.
>
>
> After you rebuilt the library, an example on getting the metadata:
>
> #include "gdal_priv.h"
> #include <iostream>
> #include <cstdlib>
> #include <string>
> #include <stdexcept>
>
> using namespace std;
>
> int main(int argc, char **argv)
> {
> GDALDataset  *poDataset;
>
>   GDALAllRegister();
>
>   //Open the subdataset
>   //The filename should be formated like this
>   //HDF5:filepath://subdataset
>   poDataset = (GDALDataset *) GDALOpen(
> "HDF5:CSKS1_DGM_B_HR_00_HH_RA_SF_20080211191721_20080211191753.h5://S01/SBI",
> GA_ReadOnly );
>
>   if( poDataset == NULL )
>   {
>       cout <<"error opening dataset"<<endl;
>   }
>   else
>   {
>            //To get the metadata the item name should be formated like this:
>            //Every space and group separator should be replaced with
> an underscore (_)
>            //I.e. You need item Beam ID from group S01:
>            const char *pszBeamId =
> poDataset->GetMetadataItem("S01_Beam_ID");
>            cout <<  pszBeamId <<endl;
>            //I.e. You need item Rescaling factor the root:
>            const char *pszRescalingFactor =
> poDataset->GetMetadataItem("Rescaling_Factor");
>            cout <<  pszRescalingFactor <<endl;
>   }
> }
>
> Best regards
>
>
>
> 2011/7/10 Antonio Valentino <[hidden email]>:
>> Hi RSyaoxin,
>>
>> Il 10/07/2011 16:08, RSyaoxin ha scritto:
>>> Hi,all.
>>>       I want to calibrate the Cosmo-Skymed radar data, and I need some
>>> parameters, such as "Calibration Constant","Rescaling Factor","Reference
>>> Incidence Angle" and so on.However,I'm a beginner,I don't know how to get
>>> HDF5 metadata,Somebody can give me a tutorial in c or c++?
>>>       Furthermore,I used HDFView to see the file's metadata and found
>>> that
>>> these information is stored in the metadata corresponding to the "root"
>>> of
>>> the file, I try to use gdalinfo to get the file's metadata  and can't
>>> find
>>> it.That's why?
>>>
>>>       Subdatasets:
>>>
>>>
>>> SUBDATASET_1_NAME=HDF5:"D:\CSKS3_GEC_B_WR_01_VV_RD_SF_20100720100133_20100720100148.h5"://MBI
>>>   SUBDATASET_1_DESC=[9028x12156] //MBI (16-bit unsigned integer)
>>>
>>>
>>> SUBDATASET_2_NAME=HDF5:"D:\CSKS3_GEC_B_WR_01_VV_RD_SF_20100720100133_20100720100148.h5"://QLK
>>>   SUBDATASET_2_DESC=[902x1215] //QLK (8-bit unsigned character)
>>>
>>> I hope to get some help.Thank you!
>>> Kind regards.
>>
>> The HDF5 driver has been recently updated to improve metadata management:
>>
>> http://trac.osgeo.org/gdal/changeset/22517
>> http://trac.osgeo.org/gdal/ticket/2412
>>
>> The problem you are experimenting should be fixed in trunk but you need
>> to re-build GDAL from sources to get it.
>>
>> regards
>>
>> --
>> Antonio Valentino
>> _______________________________________________
>> gdal-dev mailing list
>> [hidden email]
>> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>>
>
> --
> --
>      Alex Mantaut
> SUR Emprendimientos Tecnológicos
>
> Perú 345  Piso 5to Oficina "B" (C1067AAG)
> Ciudad de Buenos Aires, Argentina
> Tel. +54 (11) 4342-2976/84
> [hidden email]
> www.suremptec.com
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>
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-- 
--
     Alex Mantaut
SUR Emprendimientos Tecnológicos

Perú 345  Piso 5to Oficina "B" (C1067AAG)
Ciudad de Buenos Aires, Argentina
Tel. +54 (11) 4342-2976/84
alexmantaut at suremptec.com.ar
www.suremptec.com