Map will be centered at the mean of the lat/long values.
- x res and y res are limited to 60, for 3600 total color cells
we may increase this limit in the future
- all columns of data should be numeric values
- *use lower cutoff value to avoid display of contour data which fade to zero
such as over large bodies of water. This value should be
given as a value from 0 to 1. Experiment to see the effect of this
parameter with your data set. Set this value to 0 to display
the full rectangular contour.
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