I believe the source data, since we want it to work with non colour
information such as elevation.
Jody Garnett
On Wed, Apr 9, 2014 at 12:34 PM, Mike Grogan <d.michael.gro...@gmail.com>wrote:
> I have a question related to interpolation of raster data in a WMS. In an
> oversampling situation, where I am zoomed in past the native resolution of
> my data, what exactly is interpolated? The rendered image or the source
> data?
>
> For instance, I have a single banded geotiff that contains gridded data
> values (not RGB colors) to which I apply a ColorMap within an SLD.
>
> When interpolation (bilinear, cubic, etc.) is applied, is the
> interpolation applied to the full-color RGB output image after styling is
> applied or to the source data from the single banded geotiff before the
> ColorMap is applied?
>
> I am thinking it is applied to the full-color RGB after applying the
> ColorMap, because the only real outcome I see is more of a blurring, which
> I expect if now all 3 RGB bands are being interpolated and then added back
> together. This is because I am now interpolating colors, not data, right?
>
> If the underlying data were being interpolated first, and then the
> ColorMap applied, wouldn't I expect more of a smoothing, rather than
> blurring, outcome to the interpolation?
>
> It is this smoothing of the single band source data, rather than
> interpolation of expanded RGB output after the map is applied, that I am
> after when I am oversampling ... or zoomed in past the native resolution of
> my gridded data.
>
> Is there a way to accomplish this in GeoServer?
>
> Are there major holes in my assumptions above and/or am I just not
> thinking about this clearly?
>
> Thanks again,
>
> Mike Grogan
>
>
>
>
>
>
>
>
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