Is there a document that outlines the requirements for writing a NetCDF so
that the data contained therein can later be read as GeoGrids and/or
GridDatatypes? For example I want to be able to do this:
GridDataset gridDataset = GridDataset.open(netcdfFilePath);
GridDatatype gridDatatype =
gridDataset.findGridDatatype("gridded_data_name");
Array dataArray = gridDatatype.readDataSlice(monthIndex, -1, latIndex,
lonIndex);
My problem is that I have written data which have lon, lat, time dimensions
and corresponding lon, lat, and time variables, but after I open the NetCDF
as a GridDataset I can't get the data out as a GeoGrid or GridDatatype. I
assume that the issue is that while creating/writing the NetCDF I've not
done something required to make it so that the data can be read as desired,
so I'm looking for a list of requirements I can satisfy which will make
this so.
The Javadoc is confusing in that the interface
for
GridCoordSystem mentions
the
following assumptions
:
X and Y are 1 or 2 dimensional
T is 1 or 2 dimensional. The 2D case is that it depends on runtime.
We can create Dates out of the T and RT coordinate values.
Z, E, RT are 1-dimensional
An optional VerticalTransform can provide a height or pressure coordinate
that may be 1-4 dimensional.
However
the Javadoc
for the corresponding
GridCoordSystem
class
only mention
s t
he
s
e assumptions
:
is georeferencing (has Lat, Lon or GeoX, GeoY axes)
x, y are 1 or 2-dimensional axes.
z, t are 1-dimensional axes.
I have written NetCDF files which don't adhere completely to either of
the above sets of assumptions, however variables contained within those
NetCDF files can be read as GeoGrids/GridDatatypes. It'd be nice to have
some clarity as to what is and is not required to create a NetCDF that can
be treated as a GridDataset containing data that can be referenced as a
GeoGrid/GridDatatype -- can anyone clarify this?
Thanks in advance for any suggestions or clarification.
--James
