[ncl-talk] Plotting climate division and counties at the same time

[Rick Brownrigg]

Hi Ling,

This is a tough one -- off hand it looks like a classic issue of mixing two
disparate geodata sources of very different scales/resolutions, which
typically incur alignment/registration issues. If that's what is going on,
I don't think there's much you can really do about it. Do you know what are
the relative scales of the different sources?   Is there a reason to
believe the climate division boundaries would align with the county
(political) boundaries? (e.g., are they semi-arbitrarily defined that way
for convenience?)

Rick

On Wed, Apr 15, 2015 at 9:43 PM, Ling Huang <hlbutterflyut at gmail.com> wrote:

> Dear NCL talk,
>
> I want to show boundaries of climate division and counties over the same
> plot. But the boundaries of climate divisions and counties are provided by
> different map dataset, which means I can only draw each at a time. Is there
> a way that I can show them at the same time? For example, I want to combine
> the following two plots into one plot.
>
> The left one shows the boundaries of climate divisions and the right one
> shows county.
>
> [image: Inline image 1][image: Inline image 2]
>
> I tried to load counties boundaries while reading the "climdiv_polygons.nc"
> to plot a polyline for the climate division. But it seems the boundaries do
> not match, like below:
>
> [image: Inline image 3]
>
> Is there a way that I can do this?
>
> Thank you very much!
>
> Ling
>
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