[ncl-talk] NDVI from Advanced Very High-Resolution Radiometer (AVHRR)

[Dennis Shea]

Based on the provided information, I have no idea why you would get
"returned nothing to me"

I know that NDVI files are 0.1 degree resolution (3600,7200). You have 36
years (1986-2021) of daily data.
So, 36*365=13140   [+ a few Leap Year days)

   prc(13140,3600,7200)    => daily data

A lot of memory is needed. Maybe your computer can not handle this?

After the
      xM = calculate_monthly_values (prc, "avg", 0,opt)
      printVarSummary(xM)

   xM(432,3600,7200)



On Sat, Jun 18, 2022 at 5:01 AM Setareh Rahimi via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:

> Dear all,
>
> I need to calculate the monthly anomaly of the Normalized Difference
> Vegetation Index (NDVI), from Advanced Very High-Resolution Radiometer
> (AVHRR) sensor. I have downloaded AVHRR data (1986-2021) from the link
> below:
>
> https://www.ncei.noaa.gov/metadata/geoportal/rest/metadata/item/gov.noaa.ncdc:C01558/html
> I first tried to prepare a script to combine all the data, and then
> calculate the monthly average from daily data ( the link provides daily
> data). After having monthly data I tried to figure out anomalies (the
> script has been attached). But NCL stopped and returned nothing to me. I
> just wonder what is wrong. Please kindly advise me on this issue.
> Best wishes,
>
>
> --
> S.Rahimi
>
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