Bugfix 1838 point2grid supports the double type lat/lon

[hsoh-u]

Pull Request Testing

The NCCF library reads lat/lon variables as float. The NetCDF API does not read the double type variable if the float type data is requested. The NetCDF API reads the double type values and converts them to float type.

• Describe testing already performed for these changes:
  

• Recommend testing for the reviewer(s) to perform, including the location of input datasets, and any additional instructions:
  

/d1/personal/hsoh/git/bugfixes/bugfix_1838_point2grid_support_double_type_lat_lon/MET/met/bin/point2grid \
/d1/personal/hsoh/data/Binyu/wrong_latitude_units/VOLCAT_HIMAWARI-8_FLDK_s2020296_050000_v300250_VCB_w167_FLDK_b2020295_204000_g001_pc_rg.nc \
"latlon 200 200 45 153 0.1 0.1" \
bezy_2020296_05_regrided_p2g.nc \
-field 'name="ash_mass_loading"; level="(0,*,*)";' \
-v 4

• Do these changes include sufficient documentation updates, ensuring that no errors or warnings exist in the build of the documentation? [No]

• Do these changes include sufficient testing updates? [Yes or No]

• Will this PR result in changes to the test suite? [No]
  
  If yes, describe the new output and/or changes to the existing output:
  

• Please complete this pull request review by [7/09/2021].
  

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[JohnHalleyGotway]

I approve of these changes. Thanks for the sample testing command. I ran them using MET version 10.0.0 and the patched version. MET version 10.0.0 produces a field of empty output data while the patched version produces sane output.