Questions/Comments • Download subset of VNP02IMG data.

Hello,

I'm using VNP02IMG data for a project, and more specifically only the following three subdatasets:

- /observation_data/I05_quality_flags
- /observation_data/I05
- /observation_data/I05_brightness_temperature_lut

Until recently, I could download subsets of this dataset through S3, but apparently this was a loophole which is now closed (see here for more info: https://github.com/nsidc/earthaccess/discussions/489).

So I think there are two other options left for me to access this data (https://cmr.earthdata.nasa.gov/search/concepts/C2105091501-LAADS.html):

(1) Using a direct download (https://ladsweb.modaps.eosdis.nasa.gov/archive/allData/5200/VNP02IMG/)
(2) Using OpenDAP (https://ladsweb.modaps.eosdis.nasa.gov/opendap/RemoteResources/laads/allData/5200/VNP02IMG/contents.html)

As far as I know it's impossible to download a subset of the data through option (1). For example when I run:

gdalinfo "/vsicurl/https://ladsweb.modaps.eosdis.nasa.gov/archive/allData/5200/VNP02IMG/2016/015/VNP02IMG.A2016015.0030.002.2021082161921.nc"

I get a message saying "ERROR 1: Range downloading not supported by this server!"

So my last resort is option (2), unfortunately, none of the subdatasets that are included in the netcdf files are listed in the opendap. I guess opendap doesnt work with subdatasets? Or is this a bug? Or am I doing something wrong?

Is it really only possible to work with this data by downloading the entire file (from which I only need about 20%)?

Thanks a lot for any help or insights!

Regards,
Bert

Statistics: Posted by b.coerver — Tue Mar 12, 2024 8:27 am America/New_York

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