[ncl-talk] high resolution png image

[Kyle Griffin]

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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