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

[Alan Brammer]

I overlayed these 3 images in powerpoint increasing the transparency of
them.  The yellow boundary in the last plot does not overlap with the
boundaries of the first image.
The first 2 images overlap perfectly and the boundaries are coincident.
Something is amiss with the plotting of the yellow boundaries in the last
image.

It might be worth seeing the script here.  How are you combining them?


Alan.

On 16 April 2015 at 09:51, Rick Brownrigg <brownrig at ucar.edu> wrote:

> 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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