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Dear NCL Group,</p>
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I am using the gsn_csm_contour_map function to make a contour plot for the precipitation, see the attached. However, there are lots of un-wanted ‘noises’ outside of CONUS (no data). The data is a one dimension array with unstructured grids. How can I get rid
of those ‘noises’ and only draw the contour map over the CONUS.</p>
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Your help is greatly appreciated,</p>
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Wensong Weng</p>
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York Univ.</p>
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