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The function for reading MOPITT CO Level3 HDF data

已有 4790 次阅读 2010-11-14 13:53 |个人分类:计算程序|系统分类:科研笔记|关键词:学者

maps/200303/MOP03-Web-20030314-0.png

MOPITT is an instrument flying on NASA's EOS Terra spacecraft, measuring tropospheric carbon monoxide (CO) on the global scale. MOPITT measurements enable scientists to analyze the distribution, transport, sources and sinks of CO, a trace gas produced by methane oxidation, fossil fuel consumption and biomass burning. MOPITT has been operational since March 2000.

The introduction on MOPITT and the figure are from http://www.acd.ucar.edu/mopitt/, and also, you can download the data from this website.

The following function illustrates how to read MOPITT CO Level 3 data by using MATLAB

function mop_co = wzjReadMOPL3(fname)
   hinf = hdfinfo(fname);
   vgMOP03 = hinf.Vgroup(1);
   vgDts = vgMOP03.Vgroup(1);
   lat = hdfread(vgDts.SDS(1));
   lon = hdfread(vgDts.SDS(2));
   pre = hdfread(vgDts.SDS(3));
   mrpd = hdfread(vgDts.SDS(23));
   mrpn = hdfread(vgDts.SDS(24));
   tcd = hdfread(vgDts.SDS(35));
   tcn = hdfread(vgDts.SDS(36));
   mopco.lat = lat;
   mopco.lon = lon;
   [mopco.longrid, mopco.latgrid] = meshgrid(lon, lat);
   mopco.pre = pre;
   mopco.mrpd = mrpd;
   mopco.mrpn = mrpn;
   tcd(tcd<0)=0;
   mopco.tcd = tcd;
   tcn(tcn<0)=0;
   mopco.tcn = tcn;  
   mop_co = mopco;
end

 



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