Bugfix: Investigate polar stereographic point2grid output that is all zeros for ice coverage input data

[hsoh-u]

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Describe the Problem

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The values of ice_coverage variable from the command below are all 0 from the input data which is between 0.0 and 1.0. The same command except to_grid (lan/lon projection) produces between 0.0 and 0.9999.

/d1/personal/hsoh/git/pull_request/MET_feature_2857_tripolar_coordinates/bin/point2grid /d1/projects/MET/MET_issues/feature_2857/RTOFS/rtofs_glo_2ds_f006_ice.nc "stereo 304 448 33.92 279.26 135.0 25 6367.47 70.0 N" testing_RTOFS.nc -field 'name="ice_coverage"; level="(0,*,*)";'

Expected Behavior

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The regridded data should include non-zero values.

Environment

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1. Machine: (e.g. HPC name, Linux Workstation, Mac Laptop): seneca
2. OS: (e.g. RedHat Linux, MacOS) RedHat Linux
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Post relevant sample data following these instructions:
https://dtcenter.org/community-code/model-evaluation-tools-met/met-help-desk#ftp

Run above command at seneca

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[hsoh-u]

This is not a bug.
There were some non zero values with 'stereo 304 448 55.4 279.26 135.0 25 6367.47 70.0 N' (changed lat_ll 33.92 to 55.4)..
The image by IDV for 'stereo 304 448 55.4 279.26 135.0 25 6367.47 70.0 N' (some non-zero values at the top middle, 0 for white and 1 for blue))

The image by IDV for 'stereo 304 448 33.92 279.26 135.0 25 6367.47 70.0 N' (all zero values)

The image of the input data (0 for white and 1 for blue):