<div dir="ltr">Hi Kunal,<div>I think you just need to rearrange the order of your lines and tweak a couple of lines. As the error message states, lat is not defined in your 3rd line and you are referring to it as if it is.Try this:</div><div><span style="font-size:12.8px">a = addfile("/media/Local Disk/NPL/MODIS_FPC/MAIACTAOT.</span><wbr style="font-size:12.8px"><span style="font-size:12.8px">h00v02.20000570505.hdf","r")</span><br style="font-size:12.8px"><span style="font-size:12.8px">var = a->Optical_Depth_055(:,:)</span><br style="font-size:12.8px"><span style="font-size:12.8px">nlat = 1200</span><br style="font-size:12.8px"><span style="font-size:12.8px">nlon = 1200</span><br style="font-size:12.8px"><span style="font-size:12.8px">lat = latGlobeFo(nlat, "lat", "latitude", "degrees_north")</span></div><div><span style="font-size:12.8px">lon = lonGlobeFo(nlon, "lon", "longitude", "degrees_east") </span><br style="font-size:12.8px"><span style="font-size:12.8px">lat = lat(::-1)</span><br style="font-size:12.8px"><span style="font-size:12.8px">lon = (/ lon - 180. /) ; subtract 180 from all values </span><br style="font-size:12.8px"><span style="font-size:12.8px">lon&lon = lon ; update coordinates</span><br style="font-size:12.8px"><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">var!0 = "lat" ; you can name these dimensions whatever you want..</span><br style="font-size:12.8px"><span style="font-size:12.8px">var!1 = "lon"</span><span style="font-size:12.8px"><br></span></div><span style="font-size:12.8px">var&lat = lat ; but make sure you refer to the correct named dimensions</span><div><div><span style="font-size:12.8px">var&lat = lon</span><span style="font-size:12.8px"> </span></div><div><span style="font-size:12.8px">;var&XDim_grid1km = lat</span><br style="font-size:12.8px"><span style="font-size:12.8px">;var&YDim_grid1km = lon</span><br style="font-size:12.8px"><span style="font-size:12.8px"> </span></div><div><span style="font-size:12.8px">If you have any further questions please respond to the ncl-talk email list.</span></div><div><span style="font-size:12.8px">Adam </span><br style="font-size:12.8px"><br></div><div><br></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Sep 13, 2017 at 8:38 AM, Kunal Bali <span dir="ltr"><<a href="mailto:kunal.bali9@gmail.com" target="_blank">kunal.bali9@gmail.com</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"><div><div><div>Dear NCL<br><br></div>I have a file with the variable summary. The dimensions are in 2D. <br><br>ncl 2> printVarSummary(var)<br><br>Variable: var<br>Type: short<br>Total Size: 2880000 bytes<br> 1440000 values<br>Number of Dimensions: 2<br>Dimensions and sizes: [<b>YDim_grid1km | 1200] x [XDim_grid1km | 1200]</b><br>Coordinates: <br>Number Of Attributes: 7<br> long_name : AOT at 0.55 micron<br> scale_factor : 0.001<br> add_offset : 0<br> unit : None<br> _FillValue : -28672<br> valid_range : ( -100, 5000 )<br> hdf_name : Optical_Depth_055<br><br><br></div>I am trying to read the dimensions of this file as<br><br>begin<br>;---Read data <br> a = addfile("/media/Local Disk/NPL/MODIS_FPC/MAIACTAOT.<wbr>h00v02.20000570505.hdf","r")<br> <br> var = a->Optical_Depth_055(:,:)<br><br> var&XDim_grid1km = lat<br> var&YDim_grid1km = lon<br><br> nlat = 1200<br> nlon = 1200<br> lat = latGlobeFo(nlat, "lat", "latitude", "degrees_north")<br> lon = lonGlobeFo(nlon, "lon", "longitude", "degrees_east") <br> lat = lat(::-1)<br> lon = (/ lon - 180. /) ; subtract 180 from all values <br> lon&lon = lon ; update coordinates<br> <br> <br> var!0 = "lat"<br> var!1 = "lon"<br> <br><br></div>But the error appeared as <br><b>fatal:Variable (lat) is undefined</b><br><br><div><div><div><br></div><div>So, could anyone please let me know that how to read dimension of this file. <br><br></div><div>Thank You<br></div><div><br><div><br></div><div>Regards<span class="HOEnZb"><font color="#888888"><br clear="all"></font></span></div><span class="HOEnZb"><font color="#888888"><div><div><div><div class="m_2392430217485589217gmail_signature"><div dir="ltr"><div><div dir="ltr"><div>Kunal Bali<br></div><br><div><br></div><div><br></div><div><br></div><div><p style="margin:0px;border-collapse:collapse;font-family:Tahoma,Verdana;font-size:12px"><font color="#1F497D"><br></font></p></div></div></div></div></div></div>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div><div><span><font color="#888888">Adam Phillips <br></font></span></div><span><font color="#888888">Associate Scientist, </font></span><span><font color="#888888">Climate and Global Dynamics Laboratory, NCAR<br></font></span></div></div><div><span><font color="#888888"><a href="http://www.cgd.ucar.edu/staff/asphilli/" target="_blank">www.cgd.ucar.edu/staff/asphilli/</a> </font></span><span><font color="#888888">303-497-1726 </font></span></div><span><font color="#888888"></font></span><div><div><span><font color="#888888"><br></font></span><div><span><font color="#888888"><a href="http://www.cgd.ucar.edu/staff/asphilli" target="_blank"></a></font></span></div></div></div></div></div></div></div></div></div></div></div>
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