Re: areal average for ocean or land or coast only from multiyear datasets

Hi Rafael,

Did you make sure that you don't already have a landsea mask on your data file? Or perhaps you have one, but it's on a different file?

If you don't have one, then you can create one from a shapefile. This is a one time thing, and then you can write this new mask array to a NetCDF file so you don't have to keep creating it from scratch.

Please see example mask_12.ncl at:

http://www.ncl.ucar.edu/Applications/mask.shtml#ex12

I found the shapefile by googling "coastal shapefiles" or something like that. The shapefile came from NOAA:

  http://www.ngdc.noaa.gov/mgg/shorelines/data/gshhs/version2.2.0/

--Mary

On Dec 27, 2012, at 12:46 PM, rafael dido wrote:

> Hallo NCL users,
>
> I have 5 years datasets [time x lat x lon] 1 deg resolutions and recently attempting to calculate areal average for
> land or ocean only using masking function. I look into some documentations such as http://www.ncl.ucar.edu/Applications/Scripts/mask_1.ncl
> and I just wonder how can i get the mask file for my purpose or is there any other simple way to mask the land or ocean, and afterwards calculate the areal avergae
> for multiyear data ?
>
> Thanks for the hints and response.
>
> Raf.
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Received on Thu Dec 27 18:04:35 2012