[ncl-talk] Modis aod data analysis

[Dennis Shea]

[1] * At the very least*, you must provide the output from one
MCD19A2.A2008.....hdf  file

%> ncl_filedump MCD19A2.A2008...hdf

Actually since all  MODIS files are in HDF-EOS format, the output from:

%> ncl_filedump MCD19A2.A2008...hdf*.he2*  >!  out MCD19A2

===

[2] Scripts on the NCL website illustrate a process of how to achieve a
result.
The example you chose used variables like 'time'  on a netCDF file.
Are you using some specially processed MCD19A2 file?
I know of no MODIS MCD19A2 file that has a variable named 'time'

===
[3] You have one year of data [2008]. How do you create a climatology?

By definition, a climatology is a 'time average'. Fore example:
[a] for monthly data, you might average 10 or 25 or 100 Januaries from
different years. That gives a January climatological value.
[b] For a daily climatology, average all (say) 13 September values. Again
(say) 15, 37,..,100 values for a climatological  13 September values.
===
[4] You could read in the 2008 raw daily values and smooth them. However,
this is NOT a climatology.
===



On Thu, Nov 14, 2019 at 1:15 PM Herb, Jason via ncl-talk <ncl-talk at ucar.edu>
wrote:

> Hello All,
>
> I am attempting to do data analysis on the MODIS aod data. Currently I am
> attempting to
> [1] calculate the climatological daily annual cycle
> [2] smooth the daily annual cycle
> [3] remove the mean daily annual cycle
> [4] plot this data on map
> [5] print data for export into analysis in a program such as excel
> I have tried to follow the examples in the climatology, but have had no
> luck. Code is attached.
>
> Thanks,
> Jason
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