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

[Rick Brownrigg]

It is drawn from the last example (shapefile_15.ncl) on the following page,
and heavily modified:

http://ncl.ucar.edu/Applications/maponly.shtml

and is hea

On Thu, Apr 16, 2015 at 9:48 AM, Ling Huang <hlbutterflyut at gmail.com> wrote:

> Hi Rick,
>
> As pointed by Alan, the climate division boundaries should align with the
> county boundaries, IF both were from NCL's default settings.
>
> I guess the problem lies in the "climdiv_polygon.nc" file that I
> downloaded from NCL's website. The latitude and longitude provided by this
> file seem mismatched with the default NCL setting as shown below. Maybe
> there is another file that is more consistent with NCL's default setting?
>
> Thanks
>
> Ling
>
> [image: Displaying image.png]
>
> On Thu, Apr 16, 2015 at 8:51 AM, 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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>>>
>>
>
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