Re: [ferret_users] ferret and ERDDAP

HI,

I'll take a stab at elaborating. An ERDDAP server is an OPeNDAP server and takes the later part of its name from the Data Access Protocol (DAP) of OPeNDAP.

Broadly speaking, data in ERDDAP servers are organized into two subcategories which the ERDDAP documentation refers to as "TABLEDAP" and "GRIDDAP" data sets. GRIDDAP datasets are rectilinear grids in up to 4 dimensions (XYZT) which follow the CF conventions for grids, and TABLEDAP data sets are served as OPeNDAP sequences (more in a moment). However, both data types can also be retrieved from the server in a couple of dozen different data formats. Given an ERDDAP URL (https://coastwatch.pfeg.noaa.gov/erddap/) you can get a nice list of the GRIDDAP data sets using this URL (https://coastwatch.pfeg.noaa.gov/erddap/griddap/index.html) and the TABLEDAP data sets using this URL (https://coastwatch.pfeg.noaa.gov/erddap/tabledap/index.html)

So to use a grid data set in PyFerret, you operate just as you did in the example you shared (clicking on the "data" link on one of the data sets the "GRIDDAP" URL above) you land on an interactive page for that data set. The PyFerret accessible URL is the same minus the ".html".

[rhs@dunkel el="nofollow" href="http://apdrc.soest.hawaii.edu:80/dods/public_data/Argo_Products/annual_mean/Gridded_annual_mean">http://apdrc.soest.hawaii.edu:80/dods/public_data/Argo_Products/annual_mean/Gridded_annual_mean"

yes? show data

and then you can use the dataset as if it were a local netCDF file.

What about ERDDAP ? The page (https://ferret.pmel.noaa.gov/pmel/erddap/index.html ) seems to be saying that OPeNDAP is somehow included or covered or something.

Regards,

Ryo