[gradsusr] MODIS AEROSOL PRODUCTS

[Joshua Ngaina]

*Dear All,

*
*I have daily MODIS aerosol products (Small mode fraction).

*
*I wanted to merge these files using CDO but it seemed the files were not
merged.  *

met at met-HP-Compaq-6000-Pro-MT-PC:/media/BERTH/MODIS_DAILY$ cdo mergetime
*.nc ALLMOD08.nc
cdo mergetime: Processed 4147200 values from 64 variables over 32
timesteps. ( 0.18s )
*
So to check one of the files, I used grads and I got this error: DF file has
no discernable time coordinate -- using default values*.

ga-> sdfopen
MOD08_D3.A2001001.051.2010286151047.pscs_000500504418.Optical_Depth_Ratio_Small_Land_And_Ocean_Mean.G3.nc
Scanning self-describing file:
MOD08_D3.A2001001.051.2010286151047.pscs_000500504418.Optical_Depth_Ratio_Small_Land_And_Ocean_Mean.G3.nc
SDF file has no discernable time coordinate -- using default values.
SDF file
MOD08_D3.A2001001.051.2010286151047.pscs_000500504418.Optical_Depth_Ratio_Small_Land_And_Ocean_Mean.G3.ncis
open as file 1
LON set to 0 360
LAT set to -89.5 89.5
LEV set to 0 0
Time values set: 1:1:1:0 1:1:1:0
E set to 1 1
ga-> q file
File 1 :
  Descriptor:
MOD08_D3.A2001001.051.2010286151047.pscs_000500504418.Optical_Depth_Ratio_Small_Land_And_Ocean_Mean.G3.nc
  Binary:
MOD08_D3.A2001001.051.2010286151047.pscs_000500504418.Optical_Depth_Ratio_Small_Land_And_Ocean_Mean.G3.nc
  Type = Gridded
  Xsize = 360  Ysize = 180  Zsize = 1  Tsize = 1  Esize = 1
  Number of Variables = 2
     optical_depth_l  0  y,x  Aerosol Optical Thickness at 0.55 microns for
both Ocean (best) and Land (corrected): Mean
     optical_depth_r  0  y,x  Ratio of small mode aerosol optical depth at
0.55 micron for both land and ocean: Mean
*
*
*I also checked the merged netcdf file *

ga-> sdfopen ALLMOD08.nc
Scanning self-describing file:  ALLMOD08.nc
SDF file has no discernable time coordinate -- using default values.
SDF file ALLMOD08.nc is open as file 1
LON set to 0 360
LAT set to -89.5 89.5
LEV set to 0 0
Time values set: 1:1:1:0 1:1:1:0
E set to 1 1
ga-> q file
File 1 :
  Descriptor: ALLMOD08.nc
  Binary: ALLMOD08.nc
  Type = Gridded
  Xsize = 360  Ysize = 180  Zsize = 1  Tsize = 1  Esize = 1
  Number of Variables = 2
     optical_depth_l  0  y,x  Aerosol Optical Thickness at 0.55 microns for
both Ocean (best) and Land (corrected): Mean
     optical_depth_r  0  y,x  Ratio of small mode aerosol optical depth at
0.55 micron for both land and ocean: Mean

*I also noted that the dimension of both files were the same.

*
*My major problem is with many files of this type, How do I merge this
files for analysis with GrADs. Please advise
*
*
*
*
Regards and Thanks,*

Joshua Ngaina
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