<div dir="ltr">; Data are stored in<b> 2-byte integer binary format (little endian) </b>and are <br>; <b>pixel-interleaved three-item vectors (u, v, 3)</b>. Each vector represents three variables:<br>; <br>; U Component (cm/sec)—Scaled by a factor of 10; divide by 10 to revert to original units.<br>; V Component (cm/sec)—Scaled by a factor of 10; divide by 10 to revert to original units.<br>; Third Variable—Varies for daily and mean grids (see below). For both daily and mean grids, <br>; a pixel value of 0 in the third variable indicates no vectors at that location.<br>;<br><br> fName = "..."<br> setfileoption("bin","<wbr>ReadByteOrder","LittleEndian")<br> xs = fbindirread(fname,0,(/nrows,<wbr>ncols,3/), "short") <br><br> u = xs(:,:,0)*0.1<br> v = xs(:,:,/)*0.1<br> i = xs(:,:,2)<div class="gmail-adL"><br></div><div class="gmail-adL">I have placed some netCDF EASE lat/lon grids at<br><br></div><div class="gmail-adL">ftp <a href="http://ftp.cgd.ucar.edu">ftp.cgd.ucar.edu</a><br></div><div class="gmail-adL">anonymous<br></div><div class="gmail-adL">your_ email<br><br></div><div class="gmail-adL">cd pub/shea<br></div><div class="gmail-adL">mget *<br></div><div class="gmail-adL">quit<br><br> 518856 Jul 27 19:14 EaseLatLon_100km.nc<br> 33224032 Jul 27 19:14 <a href="http://EaseLatLon.1441x1441.nc">EaseLatLon.1441x1441.nc</a><br> 8317800 Jul 27 19:14 <a href="http://EaseLatLon.721x721.nc">EaseLatLon.721x721.nc</a><br><br>===<br>; Data are stored in<b> 2-byte integer binary format (little endian) </b>and are <br>; <b>pixel-interleaved three-item vectors (u, v, 3)</b>. Each vector represents three variables:<br>; <br>; U Component (cm/sec)—Scaled by a factor of 10; divide by 10 to revert to original units.<br>; V Component (cm/sec)—Scaled by a factor of 10; divide by 10 to revert to original units.<br>; Third Variable—Varies for daily and mean grids (see below). For both daily and mean grids, <br>; a pixel value of 0 in the third variable indicates no vectors at that location.<br>;<br><br> fName = "..."<br> setfileoption("bin","<wbr>ReadByteOrder","LittleEndian")<br> xs = fbindirread(fname,0,(/nrows,<wbr>ncols,3/), "short") <br><br> u = xs(:,:,0)*0.1<br> v = xs(:,:,/)*0.1<br> i = xs(:,:,2)<div class="gmail-adL"><br></div></div><div class="gmail-adL"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Jul 27, 2018 at 4:27 PM, Dave Allured - NOAA Affiliate <span dir="ltr"><<a href="mailto:dave.allured@noaa.gov" target="_blank">dave.allured@noaa.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Sourav,<br><br>According to the user guide on that website, this format is flat binary, signed 16 bit integers, three grids interleaved. The three grids are U, V, and day counts. You can read this file with the cbinread function.<br><br>You may also need the latitudes and longitudes, which are provided in separate files in their "tools" directory. These are 4-column text files which can be read with the asciiread function. Please try the attached sample NCL script, which reads both kinds of files.<br><br>Please see the first section "Daily Gridded and Mean Gridded Files" in their user guide. After reading the raw data and coordinate files, you will need to apply a scale factor to U and V, as they describe. You should also convert U and V from integer to float at the same time, to avoid loss of precision. Depending on your application, you might also need to use the day counts grid to make a data mask.<div><br></div><div>When making plots, you will need to apply the latitudes and longitudes as 2-D coordinates, as described in other examples on the NCL website.</div><div><br></div><div>--Dave<br><div><div><div class="gmail_extra"><br><div class="gmail_quote"><br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div lang="EN-AU"><div class="m_3247298714841300129gmail-m_-6887353538777704071WordSection1">
<p class="MsoNormal"><u></u><b><span style="font-size:12pt;color:black">From: </span></b><span style="font-size:12pt;color:black">Sourav Chatterjee <<a href="mailto:srvsxc@outlook.com" target="_blank">srvsxc@outlook.com</a>></span></p><span class=""><div style="border-style:solid none none;border-top-width:1pt;border-top-color:rgb(181,196,223);padding:3pt 0cm 0cm"><p class="MsoNormal"><span style="font-size:12pt;color:black">
<b>Date: </b>Thursday, 26 July 2018 at 4:03 PM<br><u></u></span></p>
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<p class="MsoNormal"><a name="m_3247298714841300129_m_-6887353538777704071__MailOriginalBody"><span style="font-size:12pt;color:black">Dear NCL users<u></u><u></u></span></a></p>
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<p class="MsoNormal"><span><span style="font-size:12pt;color:black">Can anyone help me out with reading the NSIDC</span></span><span><span style="color:black"> EASE-Grid Sea Ice
Motion Vectors data (.bin format) in NCL.</span></span><span><span style="font-size:12pt;color:black"><u></u><u></u></span></span></p>
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<p class="MsoNormal"><span><span style="color:black">I have not used this format earlier in NCL, so clueless about it. Any help is appreciated.</span></span><span><span style="font-size:12pt;color:black"><u></u><u></u></span></span></p>
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<p class="MsoNormal"><span><span style="color:black">A sample data is attached. The data format can be found in
</span></span><a href="http://nsidc.org/data/nsidc-0116/versions/3" target="_blank"><span>http://nsidc.org/data/nsidc-01<wbr>16/versions/3</span><span></span></a><span><span style="font-size:12pt;color:black"><u></u><u></u></span></span></p>
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<p class="MsoNormal"><span></span><a href="http://nsidc.org/data/nsidc-0116/versions/3" target="_blank"><span><span style="font-size:16pt;font-family:"Segoe UI",serif;text-decoration:none">Polar
Pathfinder Daily 25 km EASE-Grid Sea Ice Motion Vectors, Version 3 | National Snow and Ice Data Center</span></span><span></span></a><span><span style="font-size:16pt;font-family:"Segoe UI",serif"><u></u><u></u></span></span></p>
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<p class="MsoNormal"><span><span style="font-size:10.5pt;font-family:"Segoe UI",serif;color:rgb(102,102,102)">Polar Pathfinder Daily 25 km EASE-Grid Sea Ice Motion Vectors, Version 3<u></u><u></u></span></span></p>
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<p class="MsoNormal"><span></span><a href="http://nsidc.org" target="_blank"><span><span style="font-size:10.5pt;font-family:"Segoe UI",serif">nsidc.org</span></span><span></span></a><span><span style="font-size:10.5pt;font-family:"Segoe UI",serif;color:rgb(166,166,166)"><u></u><u></u></span></span></p>
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<p class="MsoNormal"><span><span style="color:black">Thanks in advance</span></span><span><span style="font-size:12pt;color:black"><u></u><u></u></span></span></p>
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<p class="MsoNormal"><span><span style="color:black">Sourav</span></span></p></div></div></div></blockquote></div></div></div></div></div></div>
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