Heiko Klein wrote:
I would like to load point data to the idv for the first time. The
data I'm using is in NetCDF CF-1.0 convention, having a station axis
connected to longitude/latitude coordinates, i.e. :
netcdf test {
dimensions:
station = UNLIMITED ; // (94 currently)
time = 366 ;
dim_charlen = 4 ;
variables:
float EPDL5(station, time) ;
EPDL5:_FillValue = -9999.f ;
EPDL5:component = "ammonium" ;
EPDL5:component_id = "5" ;
EPDL5:long_name = "ammonium, precip" ;
EPDL5:matrix = "precip" ;
char station(station, dim_charlen) ;
short time(time) ;
time:units = "days since 2002-01-01 00:00:00 UTC" ;
double lon(station) ;
lon:long_name = "station longitude" ;
lon:units = "degrees_east" ;
lon:_FillValue = -999999. ;
double lat(station) ;
lat:lat_name = "station latitude" ;
lat:units = "degrees_north" ;
lat:_FillValue = -999999. ;
// global attributes:
:Conventions = "CF-1.0" ;
}
Trying to read it as URL->Point Data gave me just one field 'Point
Data', and while trying to 'Create Display', I get the error message:
Unable to make PointObsDataset from file
Trying to read it as File didn't gave me a field at all.
I tried also to connect to one of the point-data servers, to look for
an example, but I haven't been allowed to access the servers.
So, what do I have to do to display point data in IDV, and compare it
i.e. as timeseries to one of my grid-cells.
Best regards,
Heiko
We dont yet have a Point-Data reader for CF-1, partly because I havent
seen a real file yet (until now), and partly because Im not sure the CF
spec is complete enough. Theres been some discussion of this on the CF
list that I need to review. From my POV, its not obvious what the
String valued "station" coordinate means. The CF spec doesnt mention
such a beast explicitly.
Anyway, looking at your file "NATTOT_year_cf.nc" , I would expect an
attribute coordinate = "lat lon" on each data variable; see CF section 5.4.
Ill look at the feasibility of adding a CF station reader when i get
back next week and see about reading your files into it ( I probably
need you to add the coordinate attribute). You might want to add
altitude info also if you can.
You might find this interesting:
http://www.unidata.ucar.edu/software/netcdf-java/formats/UnidataObsConvention.html
