[gdal-dev] Question about NITF CADRG data file extensions.

[Daniele Romagnoli]

Thx to Martin and Even for the useful information.

Best Regards,
Daniele Romagnoli


On Tue, Mar 11, 2008 at 7:57 PM, Even Rouault <even.rouault at mines-paris.org>
wrote:

> Daniele,
>
> From GDAL 1.5.0, there is a RPFTOC driver that can read the A.TOC file and
> reports a list of subdatasets. These subdatasets can then be opened with
> GDAL
> and they'll provide the list of frame files in metadata. See
> http://www.gdal.org/frmt_various.html#RPFTOC.
>
> To answer exactly to your question, you can have a look at the
> frmts/nitf/nitffile.c file in the GDAL source tree, in particularly the
> array 'nitfSeries' at the end of the file. The first column gives the
> first 2
> letters of the possible extensions. If you add as the third character the
> figures from 1 to 9 (corresponding to the 9 ARC zones), you'll have all
> the
> possible extensions.  So you have .gn1 to .gn9, .on1 to .on9, .jn1
> to .jn9, .tp1 to .tp9, .jg1 to .jg9, .ja1 to .ja9, .tl1 to .tl9, etc...
> (from
> my experience, these are the extensions that'll cover 90% of the typical
> available CADRG products)
>
>
> Le Tuesday 11 March 2008 17:10:39 Martin Chapman, vous avez écrit :
> > Daniele,
> >
> >
> >
> > The RPF specification is MILSTD-2411 which has a couple of addendums and
> > all can be found at http://earth-info.nga.mil/publications/specs/ .  The
> > basic structure of an RPF file is a root directory named RPF which
> contains
> > a file named a.toc which means "Table of Contents".  That file is a
> > database of boundaries and frames files that make up the various images
> > within the RPF file.  The boundaries constitute a group of adjacent
> frame
> > files that together make a scene or image.  Each frame file is 1536 x
> 1536
> > pixels and is formatted as an NITF file.  The frame files live within or
> > below the RPF directory in other directories and the file name is a key
> > that denotes the series, scale, zone and other information.  If you
> cannot
> > open the frame files because your viewer wants an .ntf extension, just
> > change the extension to .ntf and it will open in your viewer.  Then RPF
> is
> > split into two types, Compressed Arc Digital Raster Graphics (CADRG) and
> > Controlled Image Base (CIB).  The first is a vector map that has one
> band
> > and a color table where the second is a one band gray scale image.  The
> > main file you should be opening is always a.toc and then you should use
> the
> > toc to retrieve whatever boundary and frame info you want.  The toc has
> the
> > file paths for each of the frames files for a given boundary.
> >
> >
> >
> > Hope this helps!
> >
> >
> >
> > Best regards,
> >
> > Martin Chapman
> >
> >
> >
> > From: gdal-dev-bounces at lists.osgeo.org
> > [mailto:gdal-dev-bounces at lists.osgeo.org] On Behalf Of Daniele Romagnoli
> > Sent: Tuesday, March 11, 2008 8:55 AM
> > To: gdal-dev at lists.osgeo.org
> > Subject: [gdal-dev] Question about NITF CADRG data file extensions.
> >
> >
> >
> > Hi list,
> > I have a trivial question about the supported/existing Nitf CADRG data
> file
> > extensions.
> >
> > In the ImageIO-Ext project, I'm setting up a NITF plugin (leveraging on
> > GDAL).
> > The ImageReaderSpi of each ImageIO reader could specify the suffixes
> which
> > the format specific plugin is able to support.
> > Actually, I'm interested in CADRG format extensions. Thus, my silly
> > question is:
> > Which file extensions exist for the NITF CADRG format?
> >
> > After a "quick and random" search, I have found some ".on1", ".on2",
> ".on5"
> > file extensions for Operational Navigation Chart and ".tp4" file
> extension
> > for Tactical Pilotage Chart.
> > I'm pretty sure there are ".onX" and ".tpX" (where X is a number) file
> > extensions. Can someone give me some advice on this?
> >
> > Thank you very much.
> >
> > Best regards,
> > Daniele
>
>
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-- 
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Eng. Daniele Romagnoli
Software Engineer

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