Re: Matching the boundary of data and map, Thanks!

Dear Xiaoming,

If your data boundary is not matching the map boundary, this is usually because your map projection parameters are not correct.

You need to know *exactly* what Lambert Conformal parallels and meridian were used for your data, and then use these values.

How are you getting these three values? Sometimes they are on the file, say as global attributes, or they may be attached to your data variable as attributes.

You probably don’t want to use the masked lambert conformal option, because this is mainly for viewing a smaller section of your original lambert conformal map.

Finally, are you also setting the two corners of your projection as seen in “lcnative_1.ncl”, via the mp*Corner* resources?

http://www.ncl.ucar.edu/Applications/lcnative.shtml

This example is also setting “tfDoNDCOverlay” to True, but you don’t need to do this if you are providing lat/lon coordinates to the plotting function.

—Mary

On Mar 31, 2014, at 4:56 PM, Xiaoming Sun <yueyunxiaoming@gmail.com> wrote:

>
> Dear All,
>
> I am plotting some regional data using lambertconformal projection.
> The data go across the equator, with most of them in the Southern Hemisphere.
> res@mpLambertParallel1F = -38.0
> res@mpLambertParallel2F = 8.0
> res@mpLambertMeridianF = -57.3
>
> I am hoping to have the map boundary directly along with the data boundary,
> (please see attached PDF plot, which DOES NOT).
>
> Then, I tried masked lambert conformal projection
> as described at
> http://www.ncl.ucar.edu/Applications/lcmask.shtml
>
> However, this cannot work,
> because the data go across the equator
> and got the following information
> "
> (0) mask_lambert_conformal: warning: you are not authorized to specify.
> (0) a maxlat that is above the equator and a minlat that is below
> (0) the equator. No masking will take place.
> "
>
> Did anyone go through this before?
>
> Any help is appreciated!
>
> Thanks,
>
> Best Regards,
>
> Xiaoming
> --
> Xiaoming Sun
> <DataMapBoundaryMatching.pdf>_______________________________________________
> ncl-talk mailing list
> List instructions, subscriber options, unsubscribe:
> http://mailman.ucar.edu/mailman/listinfo/ncl-talk

_______________________________________________
ncl-talk mailing list
List instructions, subscriber options, unsubscribe:
http://mailman.ucar.edu/mailman/listinfo/ncl-talk
Received on Tue Apr 1 09:40:09 2014