[gradsusr] Better polygon shapefiles

[Michael Mase]

Exporting shapefiles works fantastic when using lines. However, when you
export using polygons, you get very broken and disconnected shapes

Does anyone have any advice on writing/exporting solid shapefiles that have
joined multi-polygons (for each contour region; each temperature interval,
for example)?

It would be nice if each polygon layer represented each interval on the map
and was nicely joined and closed properly.
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