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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">If your image has 3 values for a pixel it is 3 band (RGB: Red, Green, Blue). There are several ways to split an RGB image into distinct
pieces, though I don’t recall the details. One is:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">gdal_translate –b 1 infile.tif red.tif<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">gdal_translate –b 2 infile.tif green.tif<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">gdal_translate –b 3 infile.tif blue.tif<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">You’ll need to read through the utility pages for the others:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><a href="http://www.gdal.org/gdal_utilities.html">http://www.gdal.org/gdal_utilities.html</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Matt<o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Ari Simmons [mailto:ari.ucb.fire@gmail.com]
<br>
<b>Sent:</b> Wednesday, June 10, 2015 11:13 AM<br>
<b>To:</b> Matt.Wilkie<br>
<b>Cc:</b> Chaitanya Kumar CH; fwtools@lists.maptools.org<br>
<b>Subject:</b> Re: [FWTools] gdal_merge with a specific pixel value clipped/removed<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hm. Yeah. I don't think this is going to work...<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I need to remove whatever pixel has the 3 values ' 230, 245, 255' ...which is different then removing from Band 1 = 230, Band 2 = 245, Band 3 = 255. If I do that, I am 'NoData'ing' values I probably want to keep (for ex: '230 246 255' would
become '0 246 0'....not right.)<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Ok. So to do this another way...is there an elegant way to go from a 3 Band to a 1 Band image (other then just taking 1 of the 2 bands). I know there is a way to go from a Grayscale 1-band to a 3-band RGB ...but is there an inverse of that?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, Jun 10, 2015 at 10:53 AM, <<a href="mailto:Matt.Wilkie@gov.yk.ca" target="_blank">Matt.Wilkie@gov.yk.ca</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">That vrt snippet looks correct. Only one nodata number per band, and it has the correct value, 230.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">In my test file 2 or so lines above <ComplexSource> there is an additional line “<NoDataValue>” with
the number as a scaled float, “1.80000000000000E+001” (the +001 at end means move decimal to right 1 time. My nodata here is “18”). Full file is attached.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Matt</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Ari
Simmons [mailto:<a href="mailto:ari.ucb.fire@gmail.com" target="_blank">ari.ucb.fire@gmail.com</a>]
<br>
<b>Sent:</b> Wednesday, June 10, 2015 10:24 AM<br>
<b>To:</b> Matt.Wilkie<br>
<b>Cc:</b> Chaitanya kumar CH; <a href="mailto:fwtools@lists.maptools.org" target="_blank">
fwtools@lists.maptools.org</a><br>
<b>Subject:</b> Re: [FWTools] gdal_merge with a specific pixel value clipped/removed</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt">Matt <br>
<br>
Not sure I see how...<br>
<br>
<ComplexSource><br>
<SourceFilename relativeToVRT="1">TEX_N00E006.tif</SourceFilename><br>
<SourceBand>1</SourceBand><br>
<SourceProperties RasterXSize="1200" RasterYSize="1200" DataType="Byte" BlockXSize="1200" BlockYSize="2" /><br>
<SrcRect xOff="0" yOff="0" xSize="1200" ySize="1200" /><br>
<DstRect xOff="0" yOff="0" xSize="1200" ySize="1200" /><br>
<NODATA>230</NODATA><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt">Do you mean change
<br>
<br>
<NODATA>230</NODATA><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">to
<br>
<br>
<NODATA>230 245 255</NODATA><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On Wed, Jun 10, 2015 at 10:20 AM, <<a href="mailto:Matt.Wilkie@gov.yk.ca" target="_blank">Matt.Wilkie@gov.yk.ca</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Perhaps try editing the .vrt file with a text editor and changing the nodata value by hand?</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Matt</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">
<a href="mailto:fwtools-bounces@lists.maptools.org" target="_blank">fwtools-bounces@lists.maptools.org</a> [mailto:<a href="mailto:fwtools-bounces@lists.maptools.org" target="_blank">fwtools-bounces@lists.maptools.org</a>]
<b>On Behalf Of </b>Ari Simmons<br>
<b>Sent:</b> Wednesday, June 10, 2015 10:19 AM<br>
<b>To:</b> Chaitanya kumar CH<br>
<b>Cc:</b> <a href="mailto:fwtools@lists.maptools.org" target="_blank">fwtools@lists.maptools.org</a><br>
<b>Subject:</b> Re: [FWTools] gdal_merge with a specific pixel value clipped/removed</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Ok - so gdal_translate works great! Thanks!<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">HOWEVER, the removal of value 230 245 255 is still no happening...when I put in:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">>>gdalbuildvrt -srcnodata "230 245 255" tif_index.vrt *.tif<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I get a .vrt with Band 1 = 0 (instead of 230) and the full 3 Band value becoming (0 245 255)....not what I expected. I expected it to become "NoData"....<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On Tue, Jun 9, 2015 at 9:17 PM, Chaitanya kumar CH <<a href="mailto:chaitanya.ch@gmail.com" target="_blank">chaitanya.ch@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Ari,<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">The vrt is an xml file that represents a single raster dataset made up of one or many rasters. So, it is already merged. You can read it using any good text editor.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">You only have to run gdal_translate to convert it to a tif.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">gdal_translate -of GTiff tif_index.vrt tif_index.tif<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On Wed, Jun 10, 2015 at 2:40 AM Ari Simmons <<a href="mailto:ari.ucb.fire@gmail.com" target="_blank">ari.ucb.fire@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt">Interesting...ok, so (knowing nothing about .vrt's and having a bunch of .tiff's) I ran this:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt">>>gdalbuildvrt -srcnodata "230 245 255" tif_index.vrt *.tif<br>
0...10...20...30...40...50...60...70...80...90...100 - done.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">then<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt">>> gdal_merge -o merged_result.tif *.vrt<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">and got<br>
<br>
ERROR 4: `*.vrt' does not exist in the file system,<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt"><br>
and is not recognised as a supported dataset name.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I'm on OSGEO4W too..<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On Tue, Jun 9, 2015 at 1:24 PM, <<a href="mailto:Matt.Wilkie@gov.yk.ca" target="_blank">Matt.Wilkie@gov.yk.ca</a>> wrote:<o:p></o:p></p>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt">
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">The error is because you need to quote the argument values to keep them from being interpreted as filenames:<br>
<br>
gdal_merge -n “230 245 255” ...<br>
<br>
However gdal_merge can't use different nodata values for each band. You need to pre-process the files before merging. This worked for me here:<br>
<br>
Create VRT (virtual raster) file for the input file(s):<br>
<br>
gdalbuildvrt -srcnodata "230 245 255”" infile1.vrt infile1.tif<br>
<br>
Then feed the .vrt's to gdal_merge:<br>
<br>
gdal_merge -of merged_result.tif infile1.vrt infile2.vrt ...<br>
<br>
<br>
You may need to switch from fwtools to Osgeo4w (if on Windows) to get gdalbuildvrt.<br>
<br>
Cheers,<br>
<br>
--<br>
matt wilkie<br>
--------------------------------------------<br>
Geomatics Analyst<br>
Information Management and Technology<br>
Yukon Department of Environment<br>
10 Burns Road * Whitehorse, Yukon * Y1A 4Y9<br>
<a href="tel:867-667-8133" target="_blank">867-667-8133</a> Tel * <a href="tel:867-393-7003" target="_blank">
867-393-7003</a> Fax<br>
<a href="http://environmentyukon.gov.yk.ca/geomatics/" target="_blank">http://environmentyukon.gov.yk.ca/geomatics/</a><br>
--------------------------------------------<br>
<br>
<br>
<br>
-----------------------------<br>
<br>
From: <a href="mailto:fwtools-bounces@lists.maptools.org" target="_blank">fwtools-bounces@lists.maptools.org</a> [mailto:<a href="mailto:fwtools-bounces@lists.maptools.org" target="_blank">fwtools-bounces@lists.maptools.org</a>] On Behalf Of Ari Simmons<br>
Sent: Tuesday, June 09, 2015 12:43 PM<br>
To: <a href="mailto:fwtools@lists.maptools.org" target="_blank">fwtools@lists.maptools.org</a><br>
Subject: [FWTools] gdal_merge with a specific pixel value clipped/removed<br>
<br>
I have a large set of .tif files and I need to merge/mosaic them all into one .tif with the no-data value removed (i.e. value 230, 245, 255). However, when I put this in...pixel '230, 245, 255' becomes '0, 245, 255').<br>
I am trying to get NO PIXEL returned for 230, 245, 255. Is that possible?<br>
I:\TFS_6\trial_merge>gdal_merge.py -o test.tif -n 230 245 255 file1.tif file2.tif<br>
<br>
ERROR 4: `245' does not exist in the file system,<br>
and is not recognised as a supported dataset name.<br>
<br>
ERROR 4: `255' does not exist in the file system,<br>
and is not recognised as a supported dataset name.<br>
<br>
0...10...20...30...40...50...60...70...80...90...100 - done.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">_______________________________________________<br>
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<p><span style="color:#888888">Chaitanya Kumar CH<o:p></o:p></span></p>
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