<div dir="ltr"><div class="gmail_default" style="font-family:georgia,serif"><div class="gmail_default">Dear Drs. Richard McDonnell and Andrea Giudiceandrea,</div><div class="gmail_default">THANK YOU VERY MUCH </div><div class="gmail_default">for the helpful suggestions.</div><div class="gmail_default">I have been able to use "Wrap" tool for converting the files' formats and spatial resolutions under Batch processing.</div><div class="gmail_default">However, i now find a small difference between the batch processing through the"Wrap" tool and the processing of individual files. </div><div class="gmail_default">The data is in 32-bit Unsigned Integer (UInt32), which needs to be converted first to 16-bit Signed Integer (Int16). </div><div class="gmail_default">When i convert the files individually, the files get converted from 32-bit to 16-bit automatically, without asking, but under the Batch Processing through Wrap the 32-bit data is retained. </div><div class="gmail_default">Anyway, THANKS again for the immense help.</div><div class="gmail_default">With Best Regards,</div><div class="gmail_default">amal kar.</div><div class="gmail_default">---------------- ---------------------------------------</div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 11 Jan 2024 at 14:41, Richard McDonnell <<a href="mailto:richard.mcdonnell@opw.ie">richard.mcdonnell@opw.ie</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"><div class="msg-6865028846896386859">
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<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Hi,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">One solution is to use Warp, found under
<b>Raster</b> </span><span style="font-size:11pt;font-family:Wingdings;color:rgb(31,73,125)">à</span><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">
<b>Projections </b></span><span style="font-size:11pt;font-family:Wingdings;color:rgb(31,73,125)">à</span><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">
<b>Warp (reproject)<u></u><u></u></b></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">This will allow you to specify a resolution and also change the file type.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Kind Regards,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><br>
Richard<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
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——</span><br>
<span style="font-family:Arial,sans-serif;font-weight:bold;color:rgb(0,77,68)">Richard McDonnell MSc GIS, FME Certified Professional</span><br>
<span style="font-family:Arial,sans-serif;color:rgb(0,77,68)"><i>FRM Data Management</i></span><br>
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<span style="font-family:Arial,sans-serif;font-weight:bold;color:rgb(0,77,68)">Oifig na nOibreacha Poiblí</span><br>
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</span><br>
<span style="font-family:Arial,sans-serif;color:rgb(86,81,72)">Jonathan Swift Street, Trim, Co Meath, C15 NX36</span><br>
<span style="font-family:Arial,sans-serif;color:rgb(86,81,72)">——</span><br>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11pt;font-family:Calibri,sans-serif">From:</span></b><span lang="EN-US" style="font-size:11pt;font-family:Calibri,sans-serif"> QGIS-User <<a href="mailto:qgis-user-bounces@lists.osgeo.org" target="_blank">qgis-user-bounces@lists.osgeo.org</a>>
<b>On Behalf Of </b>Amal Kar via QGIS-User<br>
<b>Sent:</b> 11 January 2024 08:16<br>
<b>To:</b> <a href="mailto:qgis-user@lists.osgeo.org" target="_blank">qgis-user@lists.osgeo.org</a><br>
<b>Subject:</b> [Qgis-user] Amal Kar - India - Batch conversion of files for raster layer format from geotiff to idrisi, and simultaneously from a higher pixel resolution to a lower one.<u></u><u></u></span></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><span style="font-family:Georgia,serif">Dear Community Members,<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-family:Georgia,serif">I am currently trying to make use of a series of Raster data files from Modis satellite sensors that are available in Geotiff format (.tif) and in the pixel resolution of 500-m. <u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-family:Georgia,serif">I downloaded the files from a USGS website, and wanted to convert each file into an Idrisi raster format (16 bit integer elevation data in .RST & .RDC files), and in 1-km pixel resolution.<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-family:Georgia,serif">I<span class="m_-6865028846896386859gmaildefault"> am using the batch convert utility in my QGIS (ver. 3.18; Zurich) within the GDAL Toolbox, especially its "Translate (Convert Format)" utility under "Raster Conversion".
</span></span><u></u><u></u></p>
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<p class="MsoNormal"><span class="m_-6865028846896386859gmaildefault"><span style="font-family:Georgia,serif">While this utility converts all the files from .tif to .rst & .rdc very quickly and accurately, it does not have any scope of changing the pixel resolution (i.e., from
pixel width & height of 0.00417 arc degrees for 500 m pixels to the </span></span><span style="font-family:Georgia,serif">width & height of 0.008333333 arc degrees<span class="m_-6865028846896386859gmaildefault"> for the desired 1-km pixels).</span></span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:Georgia,serif">When i do the conversion of files individually by opening each .tif raster file and then exporting each ("Save as") to idrisi format, it opens a new window of "Save Raster Layer as....", where the
options are for changing the "Resolution", both horizontal and vertical.<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-family:Georgia,serif">However, changing each data file through this process, especially when i am dealing with a few hundreds of daily satellite data files, is very cumbersome. There must be some clickable tool hidden
within the Tool Box, which i am too naive to understand and pick up (i am NOT computer-savvy, although i use it more often for digital analysis of my earth surface data in GIS).<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-family:Georgia,serif">I shall be highly grateful if you can lead me to the appropriate tool in my QGIS (ver. 3.18; Zurich), which can be easily followed.<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-family:Georgia,serif">Thanking You for Your patience, and with Kind Regards,<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-family:Georgia,serif">amal kar.<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-family:Georgia,serif">-- ------ ------------------<u></u><u></u></span></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><span class="m_-6865028846896386859gmailsignatureprefix">-- </span><u></u><u></u></p>
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<p class="MsoNormal"><span style="color:blue">Dr. Amal Kar</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-size:10pt;color:rgb(102,0,0);background:white">Former Principal Scientist and Head, Division of Natural Resources & Environment,</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-size:10pt;color:rgb(102,0,0);background:white">Central Arid Zone Research Institute, Jodhpur 342003, India</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="color:blue">A-1/6, Baitalik Housing Society, KMDA Housing Complex,</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-size:10pt;color:blue">Baghajatin (Near Hiland Park),</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-size:10pt;color:blue">KOLKATA 700 094, India</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-size:10pt;color:blue">Email: <a href="mailto:akarcaz50@gmail.com" target="_blank">
akarcaz50@gmail.com</a></span><u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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</div></blockquote></div><br clear="all"><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>