Parent Topic: <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/GDB|Supported+File+Formats">Supported File Formats</a><hr>
<H4>NDF (NLAPS Data Format)</H4>
The National Landsat Archive Production System Data Format (NLAPS Data Format)
is the distribution format used by the USGS (Eros Data Center) for Landsat
data. It apparently supersedes use of Eosat Fast Format from the 
Eros Data Center. NDF format is a CDROM raster image format supported 
for read, but not for creation.<p>
NDF datasets consist of a number of files, as shown below.
In order to read an NDF dataset it is necessary to select the header file 
(the one with the extension `.hd'). Once this is selected, each of the band
files (.i1, .i2, etc.) will be opened. If the naming conventions are 
different than those shown here, it may not be possible to read the dataset.
<P>
<PRE>
-r-xr-xr-x  1 11431  24  44073342 Sep 18 15:33 01196082.dat
-r-xr-xr-x  1 11431  24       889 Sep 18 15:33 224242.sum
-rwxrwxr-x  1 11431  24       588 Sep 19 08:27 YMTRANS.TBL
-r-xr-xr-x  1 11431  24      2565 Sep 18 15:33 lt501704.hd &lt;-- Header File
-r-xr-xr-x  1 11431  24    100836 Sep 18 15:33 lt501704.hi
-r-xr-xr-x  1 11431  24  44073342 Sep 18 15:36 lt501704.i1
-r-xr-xr-x  1 11431  24  44073342 Sep 18 15:38 lt501704.i2
-r-xr-xr-x  1 11431  24  44073342 Sep 18 15:40 lt501704.i3
-r-xr-xr-x  1 11431  24  44073342 Sep 18 15:43 lt501704.i4
-r-xr-xr-x  1 11431  24  44073342 Sep 18 15:45 lt501704.i5
-r-xr-xr-x  1 11431  24  44073342 Sep 18 15:48 lt501704.i6
-r-xr-xr-x  1 11431  24  44073342 Sep 18 15:50 lt501704.i7
-r-xr-xr-x  1 11431  24     20836 Sep 18 15:50 lt501704.wo
</PRE>
NDF data can potentially have many variations, however the translator has only
been tested with a few typical output products. Some precision geocoded
products may include a DEM; these cannot be read.<p>
All the information from the header file will be imported as a text segment
in order
that the information is preserved with the dataset for later review.
A ground control point segment will be generated with five points
representing the four corner points and the central reference point of the 
image. The datasets can be easily geocoded using GCPWorks and these included
control points. However, even geocoded products are produced with
some rotation from north, therefore it is not possible to treat the original
dataset as geocoded.<p>
The CDNLAPS PACE task can be used to import NLAPS data with the ephemeris 
data required for satellite ortho correction preserved. The MNLAPS PACE
task can be used to read NLAPS tapes. CDNLAPS and MNLAPS are part of the
satellite ortho correction package.
<P>

See Also: <A HREF = "http://www.pcigeomatics.com/cgi-bin/pcihlp/FIMPORT">FIMPORT</A>, <A HREF = "http://www.pcigeomatics.com/cgi-bin/pcihlp/LINK">LINK</A>, <A HREF = "http://www.pcigeomatics.com/cgi-bin/pcihlp/CDNLAPS">CDNLAPS</A>, <A HREF = "http://www.pcigeomatics.com/cgi-bin/pcihlp/MNLAPS">MNLAPS</A><P>
<hr>
Parent Topic: <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/GDB|Supported+File+Formats">Supported File Formats</a><br>
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