| Landsat HDF [message #70820] |
Tue, 11 May 2010 07:24  |
raghuram
Messages: 32
Registered: February 2008
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Hello,
I'm trying to retrieve projection information from a Landsat HDF
(HDF4) file using IDL. Using the IDL routines, I'm able to retrive the
data but am not finding any functions or keywords to read the
projection information. Apparently, its possible to retrieve these
parameters using GDAL but if I can find an IDL/ ENVI solution, it'd be
more useful.
Basically, I just want to retrieve the corner coordinates of the the
four corners of an image as map coordinates (geographic or
UTM..whatever the input projection is) and not as pixel coordinates
(samples, lines).
Please let me know if you have any suggestions.
Thanks,
Raghu
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| Re: Landsat HDF [message #70892 is a reply to message #70820] |
Thu, 13 May 2010 08:52  |
raghuram
Messages: 32
Registered: February 2008
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Member |
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Oh okay. The data is available internally here. Let me find an
external data link from where Landsat HDFs can be downloaded and send
it. It seems like the HDF type is similar to what MODIS has. But I
know that a lot of toolkits that have been written are MODIS product
specific- so they don't work for the landsat scenes.
Raghu
On May 12, 3:18 pm, David Fanning <n...@dfanning.com> wrote:
> Raghu writes:
>> Apparently, HDF file types package both the data and ancillary
>> information like projection in a single compact file. So I don't have
>> any extra header files such as *.hdr accompanying the *.hdf files
>> where I could read the projection from. The specific HDF file type of
>> the file I'm using is HDF4_EOS:EOS_GRID.
>
> Yes, I understand that. But, where can I download one?
> My advice is usually not very good, unless I can test
> it first. :-)
>
> Cheers,
>
> David
>
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.dfanning.com/
> Sepore ma de ni thue. ("Perhaps thos speakest truth.")
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| Re: Landsat HDF [message #70957 is a reply to message #70892] |
Wed, 19 May 2010 12:18 |
raghuram
Messages: 32
Registered: February 2008
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Member |
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On May 13, 11:52 am, Raghu <raghuram.narasim...@gmail.com> wrote:
> Oh okay. The data is available internally here. Let me find an
> external data link from where Landsat HDFs can be downloaded and send
> it. It seems like the HDF type is similar to what MODIS has. But I
> know that a lot of toolkits that have been written are MODIS product
> specific- so they don't work for the landsat scenes.
>
> Raghu
>
> On May 12, 3:18 pm, David Fanning <n...@dfanning.com> wrote:
>
>> Raghu writes:
>>> Apparently, HDF file types package both the data and ancillary
>>> information like projection in a single compact file. So I don't have
>>> any extra header files such as *.hdr accompanying the *.hdf files
>>> where I could read the projection from. The specific HDF file type of
>>> the file I'm using is HDF4_EOS:EOS_GRID.
>
>> Yes, I understand that. But, where can I download one?
Okay, I've tried looking for external links to Landsat HDF and have
not found any. I'll send a link location as soon as I find one. Sorry
for any inconvenience caused.
Thanks,
Raghu
>> My advice is usually not very good, unless I can test
>> it first. :-)
>
>> Cheers,
>
>> David
>
>> --
>> David Fanning, Ph.D.
>> Fanning Software Consulting, Inc.
>> Coyote's Guide to IDL Programming:http://www.dfanning.com/
>> Sepore ma de ni thue. ("Perhaps thos speakest truth.")
>
>
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| Re: Landsat HDF [message #71028 is a reply to message #70951] |
Tue, 25 May 2010 14:46 |
raghuram
Messages: 32
Registered: February 2008
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Member |
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On May 20, 8:05 am, "lbus...@yahoo.it" <lbus...@yahoo.it> wrote:
> Hi Raghu,
>
> I think that you can gain access to someLANDSATfree data starting
> from this web page:
>
> http://landsat.usgs.gov/Landsat_Search_and_Download.php
>
> Hope this helps,
>
> Lorenzo
Hi Lorenzo,
Yes, the tool works. But the standard output formats are not in HDF-
thats the problem (unless these files can actually be downloaded in
HDF format).
Raghu
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