ropensci / rerddap

R client for working with ERDDAP servers
https://docs.ropensci.org/rerddap
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Query to get back just dimension vars #33

Closed sckott closed 6 years ago

sckott commented 9 years ago

after playing a bit:

It looks like with dimension variables (Eg.., lat, lon), you can't query by a dim var, but not return that dim var, so e.g., (this call works)

http://coastwatch.pfeg.noaa.gov/erddap/griddap/erdQSwind3day.htmlTable?latitude[(-15.0):1:(15.0)],longitude[(0.0):1:(360.0)]

We get back lat and lon, but we can't e.g., get back just lat, but include a query for lon.

Also, I haven't yet found a way to query to get just latitude e.g., but also get a measurement variable, e.g., x_wind here (this call doesn't work):

http://coastwatch.pfeg.noaa.gov/erddap/griddap/erdQSwind3day.htmlTable?x_wind[(-15.0):1:(15.0)],latitude[(-15.0):1:(15.0)]

So anyway, I think we can allow the first situation, where you don't get any measured variables back, but you can get just dimension variables.

sckott commented 7 years ago

Possibly do through the fields param? But i think that only affects the measured vars, not dim vars.

Could do by another parameter like dim_fields to request dim fields to return - this will just grab the dim vars the user wants, after downloading all data.

sckott commented 6 years ago

not convinced this is worth working on since you can just subset data once you pull it down, and it isn't really supported in the ERDDAP framework