Ferret

How to use the OPeNDAP server in Ferret.

The following explains the steps of loading data served by OPeNDAP using Ferret.

Download and install Ferret (if needed):

Start Ferret:

Load data using the URL and proceed as you normally would:
Note: ! operator as comments.


yes?   

yes?   

yes?   

yes?   
 ! Opens the OPeNDAP served data.
SET DATA "http://apdrc.soest.hawaii.edu/dods/public_data/NLOM/nlom_ssh"
! Returns variable's spatial and temporal information.
show data
! Contours ssh for specified time and space
SHADE/t="03-oct-2004"/x=195:207/y=18:24 ssh
! Plot land outlines
go land

Downloading a subset of the data is popular. Please be mindful of the size of the downloads especially for high resolution datasets. Making multiple temperal subsets maybe required. Load data using the URL, specify a subset and save a netcdf file:
Note: ! indicates a comment.

Start Ferret:

          ! Opens the OPeNDAP served data.
yes?   USE "http://apdrc.soest.hawaii.edu/dods/public_data/Reanalysis_Data/ERA5/daily_3d/U_component_of_wind"

          ! Returns variable's spatial and temporal information. This dataset is huge.
yes?   show data
  currently SET data sets:
  1> http://apdrc.soest.hawaii.edu:80/dods/public_data/Reanalysis_Data/ERA5/daily_3d/U_component_of_wind (default)
  nametitle IJKL
  Uu component of wind [m s**-1] 1:1440 1:721 1:27 1:15372

          !   Specified time and space range
yes?   SET REGION/X=135W:120W/Y=35N:45N/Z=850/T="01-oct-2007":"31-oct-2007"

          ! Save u to a netcdf file called era5_oct07.nc
yes?    SAVE/FILE=era5_oct07_850.nc u
  LISTing to file era5_oct07_850.nc