installing/loading OPeNDAP

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Laurel Bayless
Laurel Bayless 2021-5-23
评论： BN 2022-11-8
Hi!
I'm new to MatLab so please forgive me for my lack of understanding, but I'm trying to use sea surface temperatures from http://iridl.ldeo.columbia.edu/ to make a correlation field. The data I want is accessible through OPeNDAP, but when I type the code the website provides:
loaddap('http://iridl.ldeo.columbia.edu/SOURCES/.NOAA/.NCDC/.ERSST/.version5/.sst/X/%2880W%29%280%29RANGEEDGES/T/%28Jul%201993%29%28Jun%202019%29RANGEEDGES/Y/%2820S%29%2880N%29RANGEEDGES/T/%28Jul-Jun%29seasonalAverage/dods')
MatLab tells ' isn't a valid character. So I tried the following:
>> modis='http://iridl.ldeo.columbia.edu/SOURCES/.NOAA/.NCDC/.ERSST/.version5/.sst/X/%2880W%29%280%29RANGEEDGES/T/%28Jul%201993%29%28Jun%202019%29RANGEEDGES/Y/%2820S%29%2880N%29RANGEEDGES/T/%28Jul-Jun%29seasonalAverage/dods'
modis =
'http://iridl.ldeo.columbia.edu/SOURCES/.NOAA/.NCDC/.ERSST/.version5/.sst/X/%2880W%29%280%29RANGEEDGES/T/%28Jul%201993%29%28Jun%202019%29RANGEEDGES/Y/%2820S%29%2880N%29RANGEEDGES/T/%28Jul-Jun%29seasonalAverage/dods'
>> ncid = netcdf.open ( modis )
And I got the following error.
Error using matlab.internal.imagesci.netcdflib
The NetCDF library encountered an error during execution of 'open' function - 'Malformed or inaccessible DAP DDS
(NC_EDDS)'. If the data source was an OPeNDAP URL, see the OPeNDAP Troubleshooting section in the Users Guide.
Error in netcdf.open (line 65)
[varargout{:}] = matlab.internal.imagesci.netcdflib ( 'open', filename, 'NOWRITE' );
I went to try to install OPeNDAP, but https://www.opendap.org/deprecated-software/matlab-loaddap/3.7.3 does not seem to have all of the components necessary to do so. Is OPeNDAP already on MatLab R2021a? If not how can I find everything I need to install? What do I need to do in order to use OPeNDAP data?
Any help is appreciated.
  2 个评论
Shiva Kalyan Diwakaruni
Shiva Kalyan Diwakaruni 2021-6-1
Hi,
can you check whether you are getting same error with other OPeNDAP endpoints for the NOAA NCDC ESSRT version 5 datasets at http://iridl.ldeo.columbia.edu/SOURCES/.NOAA/.NCDC/.ERSST/.version5/?
Thanks.
Laurel Bayless
Laurel Bayless 2021-6-1
Thank you for your message. Yes, I've tried other datasets from this same source. My problem is that MatLab doesn't recognize the function "loaddap".

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回答（1 个）

Shiva Kalyan Diwakaruni
Hi,
I have brought this issue to the notice of our developers. They will investigate the matter further.
Thanks.
  2 个评论
Laurel Bayless
Laurel Bayless 2021-6-4
Thank you very much! Please keep me updated.
BN
BN 2022-11-8
Dear @Shiva Kalyan Diwakaruni and @Laurel Bayless, I have the same issue, the loadapp function does not exist for me too. did you solve this problem? What can I do?

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