Hi Cathy,
Whenever you want to plot a subset of longitudes and you are getting
seemingly strange results, you likely need to set the resource
mpCenterLonF, which will tell ncl where you want the center longitude of
the plot to be. Usually, mpCenterLonF is set to the halfway point
between mpMinLonF and mpMaxLonF:
res@mpCenterLonF = (res@mpMinLonF+res@mpMaxLonF)/2.
You do not need to exactly specify the longitudes in
gsn_csm_vecotr_scalar_map_ce... If after adding mpCenterLonF something
still doesn't look right let us know.
Adam
Cathryn Meyer wrote:
> Hello,
>
> I am trying to make a map with contours of RH overlaid with wind
> vectors. I want this plot to be over the region 100E to 200E degrees
> longitude. I have tried to specify this using:
>
>
> res@mpLimitMode = "LatLon"
> res@mpMinLonF = 100. ; select a subregion
> res@mpMaxLonF = 200.
> res@mpMinLatF = -30.
> res@mpMaxLatF = 30.
>
>
> However when I try to do this, all of the continents are always plotted.
> If I make my region 100 to 180 lon, then the correct area and
> continents are plotted. I am not sure why. Why does the longitude
> coordinate get screwed up if I go past 180?
>
> Also, if I instead specify the correct longitudes in the following plot
> line:
>
> plot=gsn_csm_vector_scalar_map_ce(wks,U_warmtimeavg(:,40:80)*0.01+\
> 202.65,V_warmtimeavg(:,40:80)*0.01+202.65,RH_warmtimeavg(:,40:80)\
> *0.01+302.65,res)
>
> Completely different wind vectors are plotted, even though this
> specifies the same longitude as above!
>
> Does anybody know how to correctly plot RH and wind vectors from 100 to
> 200 lon, with the correct gray continents in it? Do the resources
> mpMinLonF, etc. only change values of the x-axis but not specify which
> data is actually plotted?
>
> Thanks,
> Cathy
>
-- -------------------------------------------------------------- Adam Phillips asphilli@ucar.edu National Center for Atmospheric Research tel: (303) 497-1726 ESSL/CGD/CAS fax: (303) 497-1333 P.O. Box 3000 Boulder, CO 80307-3000 http://www.cgd.ucar.edu/cas/asphilli _______________________________________________ ncl-talk mailing list ncl-talk@ucar.edu http://mailman.ucar.edu/mailman/listinfo/ncl-talk
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