Add (OSGB!) HadUK-Grid data to the CEDA-WPS

[agstephens]

• Review the HadUK-Grid datasets - which are the priorities?
  • 1km data (monthly) is the most popular so try that first.
• Review the requirements for supporting OSGB in:
  • clisops / daops / roocs-utils - we can use lat/lon to specify the bounding box and keep the data in OSGB, thus avoiding regridding
  • phoenix / pywps / owslib - need to test rendering of the domain (UK) in Phoenix
• Add a new process to flamingo - added for HadUK-Grid 1km mon
• Test and roll out

[agstephens]

NOTE: it is possible to subset on the northings and eastings, as below. However, we are avoiding that route at this stage.

>>> import xarray as xr
>>> df = xr.open_dataset('/badc/ukmo-hadobs/data/insitu/MOHC/HadOBS/HadUK-Grid/v1.0.3.0/5km/tasmin/mon/v20210712/tasmin_hadukgrid_uk_5km_mon_195301-195312.nc')
>>> v = df.sel(projection_x_coordinate=slice(400000, 500000), projection_y_coordinate=slice(400000, 500000))
>>> v.tasmin.shape
(12, 20, 20)

[agstephens]

Test 2: the files include auxiliary coordinate variables for latitude and longitude - so clisops might just work!!!

[agstephens]

It looks like it works. Roll it out and get users to test and comment.

[agstephens]

Why do 180 NC files get read from the FileMapper/DatasetMapper?