Re: observation and model spatial (raster) overlay plots

From: Chao-Jung Chien <chaojung.chien_at_nyahnyahspammersnyahnyah>
Date: Thu Oct 31 2013 - 09:52:35 MDT

Thanks Rick! Yes, I've looked at the polygons examples, and I can plot the
stations over the model results on a map. But what I really want is to be
able to show the actual values of the stations (rather than just
dots/markers) that use the same color scales as those for model results.
 The model results are being shown using gsn_csm_contour_map. It seems
gsn_add_polymarker can only put the location markers on the plot, rather
than their own values?

Again, any help on this is appreciated!


On Thu, Oct 31, 2013 at 6:20 AM, <> wrote:

> Hi,
> Have you checked out the examples at:
> Example #3 in particular seems to come closest to what you want to do. The
> first half of that script deals with subsetting and manipulating data into
> an appropriate form; depending upon your data, you may likely be able to
> ignore that part. Everything from the comment "create plot" to the end
> would be relevent to creating your plot, with the real essense of it being
> those 8 lines after the comment "plot original data".
> Hope that helps...
> Rick
> On Wed, 30 Oct 2013 22:12:48 -0700
> Chao-Jung Chien <> wrote:
>> Hi, sorry for the newbie question. I am trying to create a similar plot
>> like attached using NCL. Notice that the observational data are presented
>> in diamonds, which are overlaying a gridded model results over a certain
>> region (map).
>> Both observation and model data are already in netcdf file formats. The
>> observation data have the time-stamped values and associated lat/lon info
>> for each station.
>> Any existing NCL examples or pointers on how to create such an overlay
>> plot
>> are greatly appreciated.
>> Thanks,
>> Chao-Jung

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Received on Thu Oct 31 09:53:08 2013

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