LocStream(location_count, coord_sys=None, name=None, esmf=True)¶
The individual values of all key arrays are referenced to those of the underlying Fortran ESMF object.
In the data assimilation world, location streams can be thought of as a set of observations. Their locations are generally described using Cartesian
(x, y, z), or
(lat, lon, height)coordinates. There is no assumption of any regularity in the positions of the points. To make the concept more general, the locations for each data point are represented using a construct called keys. Keys can include other descriptors besides location, including a second set of coordinates.
Refer to the LocStrea Class of the ESMF Reference Manual for more information.
LocStreamfollows standard dictionary syntax. For example:
>>> locstream["ESMF:X"] = [1, 2, 3] >>> x = locstream["ESMF:X"] >>> locstream["ESMF:Y"] = [1, 2, 3] >>> y = locstream["ESMF:Y"] >>> locstream["ESMF:Mask"] = [0, 1, 0] >>> mask = locstream["ESMF:Mask"]
Setting keys of lists of mixed types can result in errors due to type mismatches from the ESMF library.
For ESMF to be able to recognize coordinates specified in a
LocStreamkey they need to be named with the appropriate identifiers. The particular identifiers depend on the coordinate system (i.e.
coord_sysargument) used to create the
The valid values are: