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Re: Question regarding HDF file [message #55195 is a reply to message #55144]

Tue, 07 August 2007 14:25

None[1]
Messages: 13
Registered: August 2007

Junior Member

>> But if i open the hdf file, I am getting values like -3.5123 -1.5232
>> -3.5138 .............
>
> How exactly are you reading the file? If you use the same methods
> shown in this code, you should be reading in the ImageData SDS as a
> BYTE array, which should be incapable of representing either negative
> or fractional values.

Hi. The dataset I am using is a kind of remote sensing dataset
(ASTER). Sorry to let you know lately that I was opening the hdf file
in ENVI 4.1 software. Yes, if I read it using HDF_SD_GETDATA, I will
get all zeros. I understood your point,
This result is consistent with my expectation that HDF_SD_AddData
performs automatic conversion from the IDL data type to the HDF data
type.

But is there a way to avoid this?

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[Message index]

		Question regarding HDF file By: None[1] on Sun, 05 August 2007 12:50
		Re: Question regarding HDF file By: James Kuyper on Tue, 07 August 2007 14:55
		Re: Question regarding HDF file By: None[1] on Wed, 08 August 2007 09:37
		Re: Question regarding HDF file By: None[1] on Tue, 07 August 2007 14:25
		Re: Question regarding HDF file By: James Kuyper on Tue, 07 August 2007 10:52
		Re: Question regarding HDF file By: James Kuyper on Tue, 07 August 2007 10:43
		Re: Question regarding HDF file By: None[1] on Tue, 07 August 2007 08:21
		Re: Question regarding HDF file By: James Kuyper on Mon, 06 August 2007 14:30
		Re: Question regarding HDF file By: James Kuyper on Wed, 08 August 2007 18:02

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