[gdal-dev] NGA High Resolution Elevation (HRE) data problem?

[Even Rouault]

Just a small follow-up on this (non-GDAL) issue.

http://www.gwg.nga.mil/ntb/baseline/docs/HRE_spec/index.html has now an 
addendum :

"""	The concept sample files downloaded before 10 Feb 2011 included an 
anomaly. Although marked as no display; when displayed, the display indicated 
a vertical inversion. The metadata included in the files were accurate. The 
anomaly was corrected and files downloaded after 11 Feb 2011 date no longer 
contain the inversion anomaly. """

So GDAL is correctly interpretating those files. I've visually verified that the 
new samples matches what you can see on other data sources.

Le mercredi 22 décembre 2010 22:14:34, Reynolds, Scott a écrit :
> Thanks Even.  I'll try to engage someone at the NGA and see if anyone has a
> non-GDAL viewer.
> 
> Scott
> 
> ________________________________
> 
> From: Even Rouault [mailto:even.rouault at mines-paris.org]
> Sent: Wed 22-Dec-10 1:47 PM
> To: gdal-dev at lists.osgeo.org
> Cc: Reynolds, Scott
> Subject: Re: [gdal-dev] NGA High Resolution Elevation (HRE) data problem?
> 
> 
> 
> Scott,
> 
> yes I also see the image being flipped upside-down when comparing with
> google- earth imagery for example.
> 
> I've looked at the coordinate registration info (the IGEOLO record) and it
> looks OK.
> 
> UpperLeft : 11N 487873 3627061
> UpperRight: 11N 488200 3627060
> LowerRight: 11N 488200 3626695
> LowerLeft : 11N 487872 3626695
> 
> Sometimes there are products where the registration is upside down and we
> try to correct it with a few heuristics, but it is not the case here. This
> looks like a regular NITF file that shouldn't cause problems.
> 
> So my only explanation is that the data is indeed written in the wrong
> order... I've looked (very quickly) at the PDF specification of the HRE
> products and didn't see any mention that the image should be interpreted
> south to north.
> 
> Do you have the opportunity to check with a non GDAL-based NITF viewer ? Or
> you could also try investigating with the NGA.
> 
> Best regards,
> 
> Even
> 
> Le mercredi 22 décembre 2010 17:24:45, Reynolds, Scott a écrit :
> > Hi,
> > 
> > 
> > 
> > I'm trying to add support for NGA HRE data to our applications using
> > GDAL 1.7.3 NITF driver.  Sample files 1-4 at
> > http://www.gwg.nga.mil/ntb/baseline/docs/HRE_spec/index.html are
> > referenced to UTM zone 11 and appear to be inverted north to south.
> > NITF imagery I have that is also referenced to UTM looks ok.  Any ideas?
> > 
> > 
> > 
> > Thanks,
> > 
> > Scott