Jody,
Thanks for responding. I would hope it would be of the source data for the
very reason you mention, but the resulting output when interpolation is
enabled for WMS looks blurred (like the resulting image has been scaled
then interpolated) rather than smooth (like the source data has been scaled
and interpolated).
(See my follow-up post where I show the differences ... my GeoServer
outputs look like the left part of the image, not the right part. )
Where should I dig in the source to figure out the order for sure ... or
see what I might be doing wrong?
Thanks,
Mike
On Fri, Apr 11, 2014 at 9:59 AM, Jody Garnett <jody.garn...@gmail.com>wrote:
> 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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