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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Daniele,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The RPF specification is MILSTD-2411 which has a couple of
addendums and all can be found at <a
href="http://earth-info.nga.mil/publications/specs/">http://earth-info.nga.mil/publications/specs/</a>
. 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.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hope this helps!<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Best regards,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Martin Chapman<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
gdal-dev-bounces@lists.osgeo.org [mailto:gdal-dev-bounces@lists.osgeo.org] <b>On
Behalf Of </b>Daniele Romagnoli<br>
<b>Sent:</b> Tuesday, March 11, 2008 8:55 AM<br>
<b>To:</b> gdal-dev@lists.osgeo.org<br>
<b>Subject:</b> [gdal-dev] Question about NITF CADRG data file extensions.<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hi list,<br>
I have a trivial question about the supported/existing Nitf CADRG data file
extensions.<br>
<br>
In the ImageIO-Ext project, I'm setting up a NITF plugin (leveraging on GDAL).<br>
The ImageReaderSpi of each ImageIO reader could specify the suffixes which the
format specific plugin is able to support.<br>
Actually, I'm interested in CADRG format extensions. Thus, my silly question
is:<br>
Which file extensions exist for the NITF CADRG format?<br>
<br>
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.<br>
I'm pretty sure there are ".onX" and ".tpX" (where X is a
number) file extensions. Can someone give me some advice on this?<br>
<br>
Thank you very much.<br>
<br>
Best regards,<br>
Daniele <br>
<br>
<br>
<br>
-- <br>
-------------------------------------------------------<br>
Eng. Daniele Romagnoli <br>
Software Engineer<br>
<br>
GeoSolutions S.A.S.<br>
Via Carignoni 51<br>
55041 Camaiore (LU)<br>
Italy<br>
<br>
phone: +39 0584983027<br>
fax: +39 0584983027<br>
mob: +39 328 0559267<br>
<br>
<br>
<a href="http://www.geo-solutions.it">http://www.geo-solutions.it</a><br>
<br>
-------------------------------------------------------<o:p></o:p></p>
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