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Re: [ferret_users] OPeNDAP (DODS) data from aggregation servers
Hi,
This is an important information.
Just a comment, the AVISO Opendap server (altimetry data) can be
accessed with the URL below AND with this one :
http://opendap.aviso.oceanobs.com/thredds/dodsC/ (plus "thredds" in URL)
which is a new version of Opendap and which can be accessed by new
version of Ferret (ferret 5.6 and +).
Regards,
Tony
Ansley Manke wrote:
Hi everyone,
It's come up a few times lately that data on some OPeNDAP (DODS)
servers can't be opened by Ferret. These are servers that use older
versions of the OPeNDAP aggregation server. There is an
incompatibility in the client/server libraries for OPeNDAP which means
that that Ferret users wanting to use OPeNDAP data from the older
aggregation servers will need to use Ferret version that is Ferret
version 5.60 or earlier. If you wish to use OPeNDAP data from the
newer aggregation servers it appears that versions of Ferret back to
v5.22 will open the data.
We'd encourage you to lobby the OPeNDAP aggregation server manager at
sites you use to upgrade to the latest server version, as there are
improvements in the new OPeNDAP libraries, and of course we want to be
able to use the latest Ferret versions and LAS software.
If you are trying to open a remote dataset in Ferret, and are seeing
errors like
yes? set data
"http://opendap.aviso.oceanobs.com/dodsC/merged/uv/madt_oer_merged_uv"
** netCDF error: Invalid Argument
is this a CDF file ?
You can check the version of the aggregation server, by appending
".ver" to the address in your browser:
Here is an older one:
http://opendap.aviso.oceanobs.com/dodsC/merged/uv/madt_oer_merged_uv.ver
Server Version: CatalogAggServer/0.6
Here is a newer one:
http://dods.jpl.nasa.gov/dods-bin/nph-nc/pub/data_collections/woce_v3/topex/data/05_deg/ssh05d19921121.nc.gz.ver
DODS server core software: DODS DAP++/3.2.8
Server vision: nc-dods/3.2.6
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