<div dir="ltr"><div class="gmail_default" style="font-family:georgia,serif">Dear Dr. Johannes Kroger,</div><div class="gmail_default" style="font-family:georgia,serif">Thanks for your email message.</div><div class="gmail_default" style="font-family:georgia,serif">I am attaching in the NEXT MAIL a representative AVHRR LAC data file from the NOAA CLASS for your inspection: <span style="background-color:transparent">(NSS.LHRR.NJ.D00081.S1113.E1120.B2692222.GC). </span><span style="background-color:transparent">The file is of ~26 mb size (because it contains data for only two wavelength bands (infrared bands 4 & 5 for emissivity calculation) as requested by me.</span><span style="background-color:transparent"> </span></div><div class="gmail_default" style="font-family:georgia,serif">Normally, the full data size of AVHRR LAC is ~60 mb, containing data at 1 km pixel for following bands: Band 1 & 2 (red and near-infrared bands, respectively, for vegetation greenness analysis); Band 3 (shortwave infrared band for detecting fire and cloud, especially in nighttime); Bands 4 & 5 (thermal infrared bands for temperature and emissivity studies). The full LAC data also contains data from a HRPT band (high resolution picture transmission band). Data is supplied in 8 bit, 10 bit or 16 bit.</div><div class="gmail_default" style="font-family:georgia,serif"><span style="background-color:transparent">The attached file is of ~26 mb size (because it contains data for only two wavelength bands (infrared bands 4 & 5 for emissivity calculation) as requested by me for download. Presumably the data is in 8 bit (as requested).</span></div><div class="gmail_default" style="font-family:georgia,serif"><span style="background-color:transparent">All the LAC data from NOAA CLASS are in old binary format, and needs to be converted using an old python programme: "Satpy" for conversion to GeoTiff format. Running the Satpy programme presupposes the availability of python in the computer. </span></div><div class="gmail_default" style="font-family:georgia,serif"><span style="background-color:transparent">Alternately, the GDAL library of QGIS is said to contain the necessary driver to open the LAC data. Unfortunately, none of my LAC data gets recognised by GDAL of QGIS. For such cases the available information from Google Search says the following:</span></div><div class="gmail_default" style=""><p class="MsoNormal" style="margin:0cm 0cm 6pt;text-align:justify;line-height:15pt"><font face="georgia, serif">"<span style="background-color:rgb(255,255,0)">You can
force GDAL to translate it via the built-in QGIS processing tools:</span></font></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt 35.7pt;line-height:15pt"><font face="georgia, serif" style="background-color:rgb(255,255,0)">·<span style="font-style:normal;font-variant:normal;font-size-adjust:none;font-kerning:auto;font-feature-settings:normal;font-stretch:normal;line-height:normal">
</span><b>Use the Command Line:</b> Open the <b>OSGeo4W Shell</b> (Windows) or Terminal
(Mac/Linux) and run the following command to convert it to a standard GeoTIFF
format:</font></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt 49.65pt;line-height:normal"><font face="georgia, serif" style="background-color:rgb(255,255,0)">bash</font></p>
<p class="MsoNormal" style="margin:0cm 0cm 3pt 49.65pt;line-height:normal"><font face="georgia, serif" style="background-color:rgb(255,255,0)">gdal_translate
-of GTiff input_noaa9_file output_filename.tif</font></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt 36pt;text-align:justify;line-height:115%"><font face="georgia, serif"><span style="background-color:rgb(255,255,0)"><span lang="EN-GB" style="">·<span style="font-style:normal;font-variant:normal;font-size-adjust:none;font-kerning:auto;font-feature-settings:normal;font-stretch:normal;line-height:normal">
</span></span><strong style=""><span lang="EN-GB" style="">Use
QGIS UI:</span></strong></span><span lang="EN-GB" style=""><span style="background-color:rgb(255,255,0)"> Go to <strong style="">Raster</strong> > <strong style="">Conversion</strong>
> <strong style="">Translate (Convert Format)...</strong>, choose your input file,
select <strong style="">GeoTIFF</strong> as the output format, and run the process</span>."</span></font></p></div><div class="gmail_default" style="font-family:georgia,serif"><b>This is where I am stuck up. </b></div><div class="gmail_default" style="font-family:georgia,serif">I have absolutely no knowledge of computer programming. I simply do not know how to open the OSGeo4W Shell, or where it exists in QGIS. </div><div class="gmail_default" style="font-family:georgia,serif">I am also unable to run the Command Line script. <br>If it is possible to integrate the above commands into GDAL of QGIS (ver. 3. 28.15) that allows me to Click open GDAL>Raster conversion>Translate (convert format), and then in the opened window's Input Layer put the above-mentioned LAC data <span style="background-color:transparent">(NSS.LHRR.NJ.D00081.S1113.E1120.B2692222.GC) as a single file, or a number of such files for Batch Processing for conversion to GeoTiff format, it will be of immense help.</span></div><div class="gmail_default" style="font-family:georgia,serif"><span style="background-color:transparent">PLEASE see the LAC data being sent in the next mail, and KINDLY see if QGIS can be trained to open such files without any command line interface for conversion into GeoTiff format.</span></div><div class="gmail_default" style="font-family:georgia,serif"><span style="background-color:transparent">Once i am able to use the QGIS for batch conversion of the raw LAC data, i shall be able to use the data for a comparison with the daily MODIS 1 km data from the year 2000. </span></div><div class="gmail_default" style="font-family:georgia,serif"><span style="background-color:transparent">Your kind help will be immensely appreciated.</span></div><div class="gmail_default" style="font-family:georgia,serif"><span style="background-color:transparent">I had requested NOAA CLASS to provide the LAC data in GeoTiff format, which they surely can. Unfortunately, they are not accepting any requests. </span></div><div class="gmail_default" style="font-family:georgia,serif">With Kind Regards,</div><div class="gmail_default" style="font-family:georgia,serif">Amal Kar.</div><div class="gmail_default" style="font-family:georgia,serif"><font color="#ff0000">Please see the next mail to donload the representative LAC data.</font></div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Mon, 31 Aug 2026 at 12:55, Johannes Kröger (WhereGroup) via QGIS-User <<a href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><u></u>
<div>
<p>Dear Dr. Amal Kar,</p>
<p>that looks like the output of a LLM and should be treated
accordingly with suspicion.</p>
<p>The "gdal_translate -of GTiff input_noaa9_file
output_filename.tif" line is for a shell or terminal. You can try
it in the OSGeo4W Shell.</p>
<p>Best share a link to one of the source files in the exact data
and file format you want to read. Otherwise other people can only
guess.</p>
<p>Cheers, Hannes</p>
<div>On 8/29/26 18:42, Amal Kar via
QGIS-User wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div dir="ltr">
<div>
<div class="gmail_default" style="font-family:georgia,serif">Dear
Sir,</div>
<div class="gmail_default" style="font-family:georgia,serif">I
have to read and convert in my QGIS Desktop (v.3.28.15) a
large number of old AVHRR LAC (Advanced Very High
Resolution Radiometer, Local Area Coverage) data in 1-km
pixel that i downloaded from NOAA-CLASS website (<a href="https://www.class.noaa.gov/" target="_blank">https://www.class.noaa.gov/</a>).</div>
<div class="gmail_default" style="font-family:georgia,serif">The
data is not automatically read by QGIS (in my v.3.28.15
version or in the latest version that i also tried). The
plugin that enables QGIS to read the files is a python
script. </div>
<div class="gmail_default" style="font-family:georgia,serif">I
learn from Google Search the following:</div>
<div class="gmail_default"><font face="georgia, serif"> " </font><b style="text-align:justify;background-color:transparent"><font face="georgia, serif">Troubleshooting
& Format Conversion</font></b></div>
<p class="MsoNormal" style="margin:0cm 0cm 6pt;text-align:justify;line-height:15pt"><font face="georgia, serif">If your
specific file does not render immediately due to missing
header extensions or
metadata formatting from the <a href="https://www.class.noaa.gov/" target="_blank"><span style="color:blue">NOAA
CLASS Archive</span></a>, you can
force GDAL to translate it via the built-in QGIS
processing tools:</font></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt 35.7pt;line-height:15pt"><font face="georgia, serif">·<span style="font-style:normal;font-variant:normal;font-size-adjust:none;font-kerning:auto;font-feature-settings:normal;font-stretch:normal;line-height:normal">
</span><b>Use the Command Line:</b> Open the <b>OSGeo4W
Shell</b> (Windows) or Terminal
(Mac/Linux) and run the following command to convert it
to a standard GeoTIFF
format:</font></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt 49.65pt;line-height:normal"><font face="georgia, serif" style="background-color:rgb(255,255,0)">bash</font></p>
<p class="MsoNormal" style="margin:0cm 0cm 3pt 49.65pt;line-height:normal"><font face="georgia, serif" style="background-color:rgb(255,255,0)">gdal_translate
-of GTiff input_noaa9_file output_filename.tif</font></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt 36pt;text-align:justify;line-height:115%"><font face="georgia, serif"><span lang="EN-GB">·<span style="font-style:normal;font-variant:normal;font-size-adjust:none;font-kerning:auto;font-feature-settings:normal;font-stretch:normal;line-height:normal"> </span></span><strong><span lang="EN-GB">Use
QGIS UI:</span></strong><span lang="EN-GB"> Go to <strong>Raster</strong>
> <strong>Conversion</strong>
> <strong>Translate (Convert Format)...</strong>,
choose your input file,
select <strong>GeoTIFF</strong> as the output format,
and run the process.<span class="gmail_default" style="font-family:georgia,serif">"</span></span></font></p>
<div class="gmail_default" style="font-family:georgia,serif"><br>
</div>
<div class="gmail_default" style="font-family:georgia,serif">Unfortunately,
I do not know how to add the above python script in GDAL
and make QGIS read the files automatically as and when
these are mentioned in the "GDAL>Raster conversion"
tool of QGIS (either as a single file or as batch files).</div>
<div class="gmail_default" style="font-family:georgia,serif">It
will be immensely helpful if you kindly add the script to
QGIS to permanently allow this beautiful user-friendly GIS
software to read and convert the NOAA-9 AVHRR L1B LAC data
from the NOAA CLASS website. Their website is not
providing any help. Initially it automatically diverted
the request to an "Expert" and then became silent;
presently it does not accept any request.</div>
<div class="gmail_default" style="font-family:georgia,serif">The
AVHRR daily LAC data at 1 km pixel from 1981 onwards is
immensely helpful for time-series analysis of
environmental changes, when compared with the daily MODIS
data at 1 km pixel that is available from year 2000. Your
kind help in inserting the python script in our QGIS will
immensely help in reading and analysing the old AVHRR LAC
satellite data in comparison to the present MODIS
satellite data.</div>
<div class="gmail_default" style="font-family:georgia,serif">With
Kind Regards,</div>
<div class="gmail_default" style="font-family:georgia,serif">Amal
Kar.</div>
</div>
<span class="gmail_signature_prefix">-- </span><br>
<div dir="ltr" class="gmail_signature">
<div dir="ltr"><font color="#0000ff">Dr. Amal Kar</font>
<div><span style="background-color:rgb(255,255,255)"><font color="#660000" size="2" face="times new roman, serif">Former Principal
Scientist and Head, Division of Natural Resources
& Environment,</font></span></div>
<div><font style="background-color:rgb(255,255,255)" color="#660000" size="2" face="times new roman, serif">Central
Arid Zone Research Institute, Jodhpur 342003, India</font></div>
<div><span style="color:rgb(0,0,255)">A-1/6, Baitalik
Housing Society, KMDA Housing Complex,</span><br>
</div>
<div><font size="2" color="#0000ff">Baghajatin (Near
Hiland Park),</font></div>
<div><font size="2" color="#0000ff">KOLKATA 700 094, India</font></div>
<div><font size="2" color="#0000ff">Email: <a href="mailto:akarcaz50@gmail.com" target="_blank">akarcaz50@gmail.com</a></font></div>
<div><br>
</div>
<div><br>
</div>
</div>
</div>
</div>
</div>
<br>
<fieldset></fieldset>
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</blockquote></div><div><br clear="all"></div><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><font color="#0000ff">Dr. Amal Kar</font><div><span style="background-color:rgb(255,255,255)"><font color="#660000" size="2" face="times new roman, serif">Former Principal Scientist and Head, Division of Natural Resources & Environment,</font></span></div><div><font style="background-color:rgb(255,255,255)" color="#660000" size="2" face="times new roman, serif">Central Arid Zone Research Institute, Jodhpur 342003, India</font></div><div><span style="color:rgb(0,0,255)">A-1/6, Baitalik Housing Society, KMDA Housing Complex,</span><br></div><div><font size="2" color="#0000ff">Baghajatin (Near Hiland Park),</font></div><div><font size="2" color="#0000ff">KOLKATA 700 094, India</font></div><div><font size="2" color="#0000ff">Email: <a href="mailto:akarcaz50@gmail.com" target="_blank">akarcaz50@gmail.com</a></font></div><div><br></div><div><br></div></div></div>