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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Hi Jennifer and GrADS Users,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>I have NetCDF file (<a href="http://nomads.ncep.noaa.gov/pub/data/nccf/com/rtofs/prod/rtofs.20140127/rtofs_glo_2ds_n024_daily_prog.nc">RTOFS Global</a>) downloaded from </span><span style='font-size:10.0pt;color:#1F497D'><a href="http://nomads.ncep.noaa.gov/pub/data/nccf/com/rtofs/prod/rtofs.20140127/rtofs_glo_2ds_n024_daily_prog.nc">NOMADS server</a></span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>. Ncdump of the file is<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><br>netcdf D\:/OceanCurrentData/2014/01/22/20140122_rtofs_glo_2ds_n024_daily_prog {<br>dimensions:<br> MT = UNLIMITED ; // (1 currently)<br> Y = 3298 ;<br> X = 4500 ;<br> Layer = 1 ;<br>variables:<br> double MT(MT) ;<br> MT:long_name = "time" ;<br> MT:units = "days since 1900-12-31 00:00:00" ;<br> MT:calendar = "standard" ;<br> MT:axis = "T" ;<br> double Date(MT) ;<br> Date:long_name = "date" ;<br> Date:units = "day as %Y%m%d.%f" ;<br> Date:C_format = "%13.4f" ;<br> Date:FORTRAN_format = "(f13.4)" ;<br> int Layer(Layer) ;<br> Layer:units = "layer" ;<br> Layer:positive = "down" ;<br> Layer:axis = "Z" ;<br> int Y(Y) ;<br> Y:point_spacing = "even" ;<br> Y:axis = "Y" ;<br> int X(X) ;<br> X:point_spacing = "even" ;<br> X:axis = "X" ;<br> float Latitude(Y, X) ;<br> Latitude:standard_name = "latitude" ;<br> Latitude:units = "degrees_north" ;<br> float Longitude(Y, X) ;<br> Longitude:standard_name = "longitude" ;<br> Longitude:units = "degrees_east" ;<br> Longitude:modulo = "360 degrees" ;<br> float u_velocity(MT, Layer, Y, X) ;<br> u_velocity:coordinates = "Longitude Latitude Date" ;<br> u_velocity:standard_name = "eastward_sea_water_velocity" ;<br> u_velocity:units = "m/s" ;<br> u_velocity:_FillValue = 1.267651e+030f ;<br> u_velocity:valid_range = -2.09935f, 2.310735f ;<br> u_velocity:long_name = " u-veloc. [90.9H]" ;<br> float v_velocity(MT, Layer, Y, X) ;<br> v_velocity:coordinates = "Longitude Latitude Date" ;<br> v_velocity:standard_name = "northward_sea_water_velocity" ;<br> v_velocity:units = "m/s" ;<br> v_velocity:_FillValue = 1.267651e+030f ;<br> v_velocity:valid_range = -2.275719f, 2.274807f ;<br> v_velocity:long_name = " v-veloc. [90.9H]" ;<br> float sst(MT, Y, X) ;<br> sst:coordinates = "Longitude Latitude Date" ;<br> sst:standard_name = "sea_surface_temperature" ;<br> sst:units = "degC" ;<br> sst:_FillValue = 1.267651e+030f ;<br> sst:valid_range = -6.057281f, 32.59346f ;<br> sst:long_name = " sea surf. temp. [90.9H]" ;<br> float sss(MT, Y, X) ;<br> sss:coordinates = "Longitude Latitude Date" ;<br> sss:standard_name = "sea_surface_salinity" ;<br> sss:units = "psu" ;<br> sss:_FillValue = 1.267651e+030f ;<br> sss:valid_range = 1.749605f, 40.75261f ;<br> sss:long_name = "sea surf. salnity [90.9H]" ;<br> float layer_density(MT, Layer, Y, X) ;<br> layer_density:coordinates = "Longitude Latitude Date" ;<br> layer_density:standard_name = "sea_water_potential_density" ;<br> layer_density:units = "sigma" ;<br> layer_density:_FillValue = 1.267651e+030f ;<br> layer_density:valid_range = 0.f, 0.f ;<br> layer_density:long_name = " density [90.9H]" ;<br><br>// global attributes:<br> :Conventions = "CF-1.0" ;<br> :title = "HYCOM ATLb2.00" ;<br> :institution = "National Centers for Environmental Prediction" ;<br> :source = "HYCOM archive file" ;<br> :experiment = "90.9" ;<br> :history = "archv2ncdf2d" ;<br>}<br><br><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>The dataset has 32 hybrid layers and a horizontal grid size of (4500 x 3298) . The grid has an Arctic bi-polar patch north of 47°N and a Mercator projection south of 47°N through 78.6°S</span><span style='font-family:"Arial","sans-serif";color:#1F497D'>.</span><span class=apple-converted-space><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'> <a href="http://polar.ncep.noaa.gov/global/about/?">More details can be found at link</a>. <o:p></o:p></span></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>The CTL file</span><span style='font-family:"Arial","sans-serif";color:#1F497D'> </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Am using is to display variable values : <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'> <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>dset ^20140122_rtofs_glo_2ds_n024_daily_prog.nc<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>title HYCOM ATLb2.00 <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>undef 1.26765e+30 <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>dtype netcdf <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>XDEF 4320 LINEAR </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:red;background:yellow;mso-highlight:yellow'>74.16 0.08333</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:red'> </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>YDEF 2160 LINEAR </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:red;background:yellow;mso-highlight:yellow'>-90. 0.08333</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:red'> </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>zdef 1 linear 1 1 <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>tdef 1 linear 00Z31DEC1900 1mn<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>options template<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>PDEF 4500 3298 bilin sequential binary-big </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:red'>D:\OceanCurrentData\PDEF\pdef_ncep_global </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>vars 8 <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Date=>date 0 t date <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Latitude=>latitude 0 y,x latitude <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Longitude=>longitude 0 y,x longitude <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>u_velocity=>u_velocity 1 t,z,y,x u-veloc. [90.9H] <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>v_velocity=>v_velocity 1 t,z,y,x v-veloc. [90.9H] <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>sst=>sst 0 t,y,x sea surf. temp. [90.9H] <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>sss=>sss 0 t,y,x sea surf. salnity [90.9H] <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>layer_density=>layer_density 1 t,z,y,x density [90.9H] <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>endvars<br><br><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>The file used for interpolation </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:red'>pdef_ncep_global </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>can be downloaded from <a href="http://nomad3.ncep.noaa.gov/pub/rtofs_global/20140122/">http://nomad3.ncep.noaa.gov/pub/rtofs_global/20140122/</a><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>When Am displaying current variables u_velocity and v_velocity in GrADS with following commands<br><br></span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:red'>ga->open C:/OceanCurrentData/2014/01/22/20140122_rtofs_glo_2ds_n024_daily_prog.ctl<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:red'>ga-> set lon -180 180<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:red'>ga-> set lat -90 90<br>ga-> d skip(u_velocity*1.95,50,50);v_velocity*1.95</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><br><br>The output produced with above commands is attached herewith. The output shown to grads windows is only for lon 74.16 to 179.95 approx. Understand that Longitude starts is set 74.16 in XDEF entry in CTL file (as NetCDF file contains rectiliear data from 74.16 onwards and data is packed 1/12 th the degree)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>XDEF 4320 LINEAR </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:red;background:yellow;mso-highlight:yellow'>74.16 0.08333</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:red'> <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>is defining Start point of LON. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>My Question is : How can I make command </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:red'>d skip(u_velocity*1.95,50,50);v_velocity*1.95 </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>working so that plot is on entire globe ??? not for just LON 74.16 to 179.65. (Understand that NetCDF file has linear data from 74.16 to 434, but How can I make these cartesion coordinate equivalent to geographical coordinates ????) <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Center of Plot is necessarliy to be at POINT (0,0) as plot need to be overlaid on google map.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><br><br><b>Any help or guidance would be greatly appreciated.<br><br></b></span><b><o:p></o:p></b></p><p class=MsoNormal><b><span style='color:#215868'>Thanks & Regards<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='color:#215868'>Anil Kumar – </span></b><b><span style='font-family:"Times New Roman","serif";color:#215868'>Sr. </span></b><b><span style='color:#215868'>Software Developer<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='color:#00A1DA'>OceanManager</span></b><b><i><span style='color:#215868'> </span></i></b><b><span style='color:#00A1DA'>Inc.</span></b><b><span style='color:#009BD2'> </span></b><span style='color:black'>| </span><a href="http://www.oceanmanager.com/"><span style='color:blue'>www.oceanmanager.com</span></a><span style='color:#31849B'><o:p></o:p></span></p><p class=MsoNormal><span style='color:#DC690A'>Tel: +1 (801)-758-7101, (801)-758-7207<o:p></o:p></span></p><p class=MsoNormal><span style='color:#DC690A'>Fax: +1 (801)-758-7101<o:p></o:p></span></p><p class=MsoNormal><b><span style='color:#00A1DA'>OceanManager- Marine Software<o:p></o:p></span></b></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>