[ncl-talk] OPeNDAP retrieval of MODIS as .nc?

[Rick Brownrigg]

Hi Elizabeth,

I unfortunately can not test this directly, as one must have an account on
that OpenDAP site. However, if you can download the HDF version, you could
use "ncl_convert2nc" to NetCDF.

Otherwise, seeing all the error messages might yield some insights.

Hope that helps...
Rick


On Tue, Jul 9, 2019 at 3:15 PM Burakowski, Elizabeth via ncl-talk <
ncl-talk at ucar.edu> wrote:

> Hello,
>
> I am writing an NCL script to pull a subset of MOD10A1 Daily Snow Cover
> files for analysis. I'd like to pull the files as netCDF instead of hdf.
>
> The UI page seems to suggest I can request as .nc:
>
>
> https://n5eil02u.ecs.nsidc.org/opendap/MOST/MOD10A1.006/2000.03.10/MOD10A1.A2000070.h12v04.006.2016061222432.hdf.html
>
> But it's not clear how I would do this in NCL.  For hdf, I tried to use:
>
> filename = "MOD10A1.A2019181.h12v04.006.2019183024309.hdf"
> subdir = "2019.06.30"
> url = "https://n5eil02u.ecs.nsidc.org/opendap/MOST/MOD10A1.006/"
> exists = isfilepresent(url+sudir+"/"+filename)
>
> However, I receive an error that starts with:
>
> "syntax error, unexpected WORD_WORD, expecting SCAN_ATTR or SCAN_DATASET
> or SCAN_ERROR"
>
> and ends with:
>
> "ncopen: filename "
> https://n5eil02u.ecs.nsidc.org/opendap/MOST/MOD10A1.006/2019.06.30/MOD10A1.A2019181.h12v04.006.2019183024309.hdf":
> NetCDF: Malformed or inaccessible DAP DDS"
>
> I suspect there is something wrong with the url, but this is the one
> provided by nsidc.
>
> Any suggestions?
>
> Thank you,
>
> Liz.
>
>
>
> Dr. Elizabeth A Burakowski
> She/Her/Hers
> Research Assistant Professor
> Earth Systems Research Center &
> Institute for the Study of Earth, Oceans, and Space
> University of New Hampshire
> 8 College Road Durham, NH 03824
> 603-862-1796
> elizabeth.burakowski at unh.edu
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