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<div>When I look at the function documentation for wrf_user_intrp3d at https://www.ncl.ucar.edu/Document/Functions/WRF_arw/wrf_user_intrp3d.shtml, I find the statement:</div>
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<div>loc</div>
<div>Interpolation information. Can contain up to four scalar values:</div>
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<li> <span style="font-size: 12pt;">Horizontal plots</span><br>
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<div>Use a single value to indicate the level or height to interpolate to, for example, 500 for 500hPa or 2000 for 2km.</div>
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<li> <span style="font-size: 12pt;">Cross sections</span><br>
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<div>Use two values if plotting a plane through a given point on the model domain. The two values represent the x/y location through which the plane will pass. The angle argument will be required in this case.</div>
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<div>Use four values if plotting from point A to point B. The four values represent the x/y locations of points A and B. The values should be ordered as (xstart,xend,ystart,yend).</div>
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<div>Note that the plane is then defined as (/xstart, xend, ystart, yend/)</div>
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<div>All the examples I see, however, use the definition of the plane as (/xstart, ystart, xend, yend/)</div>
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<div>Looking at the source code, wrf_intrp_3d calls wrf_user_set_xy. That function clearly uses the variables in the order: (/xstart, ystart, xend, yend/)</div>
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<div>I think the online manual page needs to be changed.</div>
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<div>I also think the statement:</div>
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<div>"<span>For vertical cross sections, the vertical levels are automatically chosen to be at approximately 1% increments from minimum height to maximum height (or maximum pressure to minimum pressure)."</span></div>
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<div><span>needs to be highlighted and moved to the section that describes "vert", as that section implies that the vert array controls the vertical interpolation steps..</span></div>
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--
<div>John Trostel<br>
Director - Severe Storms Research Center<br>
Georgia Tech Research Institute<br>
Atlanta, GA 30332-0857</div>
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