[ncl-talk] high resolution png image

[Micah Sklut]

Hi Kyle,

Thanks for the reply.

The dataset is of 0.05 degree resolution, so that certainly isn't the
problem. I have attached an image of the same data, but limiting the
min/max lat/lon to the US Mid Atlantic. In this image you will see much
more detail. This is the type of detail I was hoping to achieve for the
entire globe. I figured if I increased the resolution of the global png, it
would create the desired effect, but as you can see from the global image I
attached, this wasn't the case.

Looking forward to hearing your thoughts.
Thank you,

Micah



On Thu, Oct 30, 2014 at 12:26 PM, Kyle Griffin <ksgriffin2 at wisc.edu> wrote:

> Micah,
>
> This looks more like a limitation of your dataset - SST data is not of
> infinite resolution, and you're plotting far more pixels than would be data
> points in even a 0.1˚ dataset! It looks like the internal pixels are the
> same size as your coastlines, so I don't see an issue with NCL there. More
> specifically, you are not actually plotting coastlines - they only plot if
> you tell them to plot with a call to gsn_csm_map or another similar
> plotting tool. If you're looking for high resolution coastlines, look at
> the RANGS mapping capabilities in NCL. Beyond that, you can always plot
> shapefiles as well.
>
> Yes, vector images are going to be extremely large and painful for even a
> moderate resolution file over the full globe. When you say raster, are you
> talking about it in the image sense (non-vector file) or in the cnFillMode
> sense (RasterFill, AreaFill, etc.;
> https://www.ncl.ucar.edu/Document/Graphics/Resources/cn.shtml#cnFillMode)?
> Raster fill mode will make the data more blocky and reduce interpolation
> between points, but the trade-off is a much faster plotting of the image
> and works well for high-resolution datasets being plotted at relatively low
> resolution/wide zoom.
>
>
> Kyle
>
> ----------------------------------------
> Kyle S. Griffin
> Department of Atmospheric and Oceanic Sciences
> University of Wisconsin - Madison
> Room 1421
> 1225 W Dayton St, Madison, WI 53706
> Email: ksgriffin2 at wisc.edu
>
> On Thu, Oct 30, 2014 at 9:58 AM, Micah Sklut <micahs2005 at gmail.com> wrote:
>
>> Hi,
>>
>> This is a follow up to my previous posts, in reference to searching for
>> high resolution images that could be used as zooming/navigating (specific
>> interest is with image tile layers).
>>
>> I figured if I created a png file with a high resolution, it would be
>> able to capture the high detail, like with coastlines and so forth.
>> I've attached an image with very high resolution (16384x16384), but as
>> you can see, if you zoom the global image into the coastlines they are
>> extremely blocky.
>>
>> Is is possible to capture high resolution features, such as coastlines in
>> a global raster image with NCL?
>>
>> FYI, I tried the vector image route, but the file size was gigantic, so
>> that didn't seem like a proper route.
>>
>> Thank you,
>>
>> --
>> Micah Sklut
>>
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>>
>


-- 
Micah Sklut
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