Re: [Geoserver-users] Incorrect color of raster data In GeoServer?

[Daniele R. <dan...@ge...>]

Hi,
could you please run some gdalinfo commands on all of your sample datasets
and report back the outputs?
Moreover, how are you creating the pyramid?

For the "gray" one, I suspect it is a INT16/Float datatype with some
spikes... With no SLD being applied, the default raster style is used which
performs a contrast stretch on-the-fly on the actual data. There might be
the case that, when zooming in, the range of input pixels of that region
get properly rescaled to a 0-255 byte representation whilst when zoomed
out, some spikes in the input values make the range too wide.
So you may want to define a proper colormap to get a better rendering.
(
https://docs.geoserver.org/stable/en/user/styling/sld/reference/rastersymbolizer.html#colormap
)

Please, let us know.
Regards,
Daniele

On Mon, Aug 26, 2019 at 12:09 AM 张黎 <zli...@16...> wrote:

> I publish a raster data with GeoServer, but a strange thing happened. If I
> publish the data with GeoTIFF, it is correct, like this:
> But when I transform it as pyramid image and publish the data with
> ImagePyramid.The color is not correct. It become read like this:
>
>
> When I zoom in the map, it became correct, like the GeoTIFF map.
>
> There are another problem. Maybe the reason is the same as before. I have
> another raster data. I publish it as pyramid image, a black image in the
> map. If I zoom in the map, the image will appear.
>
> Thank you for your kind cooperation.
>
>
>
>
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-- 
Regards,
Daniele Romagnoli
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Ing. Daniele Romagnoli
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