[ncl-talk] Can't overlay maps on a NAM (native grid)

[David Brown]

The problem is that both your individual plots are drawn using a map
projection. You should draw the contour_z field without the map
projection using "gsn_csm_contour". Then you will be able to do the
overlay without error.
 -dave


On Wed, Nov 23, 2016 at 12:26 PM, Barry Lynn <barry.h.lynn at gmail.com> wrote:
> Hello:
>
> I am trying to overlay the height field from the NAM on the relative
> humidity.
>
> I succeeded to zoom and project the NAM fields correctly, and I succeeded to
> make two separate plots, both of which were projected correctly.
>
> I consulted these two pages.
>
> http://www.ncl.ucar.edu/Applications/Scripts/lcnative_2.ncl
>
> and:
>
> http://www.ncl.ucar.edu/Applications/Scripts/conOncon_2.ncl
>
> I can create test.00001, and test.00002 using the attached ncl code.
>
> However, I cannot create the overlay.
>
> I try to do this using the last two lines of the code:
>
>   overlay(contour_rh,contour_z)
>   draw(contour_rh)
>
>
> But, I get this error.
>
> fatal:NhlAddOverlay: plot class mapPlotClass cannot be overlay plot member
>
> If I try to change gsn_csm_contour_map to gsn_csm_contour to then invoke the
> overlay procedure, I get:
>
>
>
> warning:mpProjection is not a valid resource in test_contour at this time
> warning:mpLimitMode is not a valid resource in test_contour at this time
> warning:mpLeftCornerLonF is not a valid resource in test_contour at this
> time
> warning:mpRightCornerLonF is not a valid resource in test_contour at this
> time
> warning:mpLeftCornerLatF is not a valid resource in test_contour at this
> time
> warning:mpRightCornerLatF is not a valid resource in test_contour at this
> time
> warning:mpLambertMeridianF is not a valid resource in test_contour at this
> time
> warning:mpLambertParallel1F is not a valid resource in test_contour at this
> time
> warning:mpLambertParallel2F is not a valid resource in test_contour at this
> time
> warning:mpOutlineDrawOrder is not a valid resource in test_contour at this
> time
> warning:mpFillOn is not a valid resource in test_contour at this time
> warning:mpOutlineBoundarySets is not a valid resource in test_contour at
> this time
> fatal:NhlAddOverlay: plot class mapPlotClass cannot be overlay plot member
>
> and the projection is lost.
>
> Your suggestions are appreciated.
>
> Barry Lynn
>
>
> --
> Barry H. Lynn, Ph.D
> Senior Lecturer,
> The Institute of the Earth Science,
> The Hebrew University of Jerusalem,
> Givat Ram, Jerusalem 91904, Israel
> Tel: 972 547 231 170
> Fax: (972)-25662581
>
> C.E.O, Weather It Is, LTD
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