<div dir="ltr"><span style="font-family:arial;font-size:14px">Xiaofeng Li,</span><div><font face="arial"><br></font></div><div><font face="arial">You have BNG coordinates on an even 1-Km grid. I do not know of any internal NCL solution.</font></div><div><font face="arial"><br></font></div><div><font face="arial">The </font><span style="font-family:arial">best solution is to find published latitude and longitude coordinates for the BNG 1-Km grid from an official source. These should be in the form of 2-D equivalent arrays or tables, lats(x,y) and lons(x,y). </span><span style="font-family:arial">NCL can read 2-D equivalent arrays in many different formats, so the exact format is not important. And of course, you can easily take a subset out of a larger reference grid, or a higher resolution grid.</span></div><div><span style="font-family:arial"><br></span></div><div><span style="font-family:arial">You will need to find these published coordinates for yourself. I am not sure whether the 1-Km coordinates are published, but there is an excellent chance that they are out there somewhere. There is also published software that can generate the coordinates for you, but that is more difficult than just finding and downloading the 1-km grid coordinates from an official source.</span></div><div><span style="font-family:arial"><br></span></div><div><span style="font-family:arial">When you have </span><span style="font-family:arial">lats(x,y) and lons(x,y), you can read them into NCL and use them to geolocate your BNG data grids for plotting and other applications. HTH.</span></div><div><span style="font-family:arial"><br></span></div><div><span style="font-family:arial">--Dave</span></div><div><span style="font-family:arial"><br></span></div><div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Nov 16, 2016 at 7:04 AM, Xiaofeng Li <span dir="ltr"><<a href="mailto:Xiaofeng.Li@newcastle.ac.uk" target="_blank">Xiaofeng.Li@newcastle.ac.uk</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
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Dear all,</div>
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Is there any function in NCL to covert the British National Grid (BNG) to the normal latitude and longitude? see the attach NC data,”<a href="http://test.nc" target="_blank">test.nc</a>".</div>
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I’ve checked this web <a href="http://www.ncl.ucar.edu/Document/Graphics/contour_grids.shtml" target="_blank">http://www.ncl.ucar.edu/Do<wbr>cument/Graphics/contour_grids.<wbr>shtml</a>, and it seems that the BNG is not supported by the NCL plotting.</div>
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Any information is appreciable.</div>
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Regards,</div>
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Xiaofeng Li</div></div></div></blockquote></div><br></div></div></div>