Hello,
I made several pyramids of my raster data using gdal_retile.py, I'm testing
the different resampling algorithms (near, bilinear, cubic, cubicspline) of
gdal_retile.
In Geoserver > Config > WMS > Rendering > Interpolation we have a choice
between Nearest Neighbour, Bilinear and Bicubic. I was wondering : should
this choice have an influence on the display of my pyramids, possibly
depending on the pyramid's resampling method ? I can't find any difference
when changing the interpolation method.
I wonder the same for the antialias checkbox, should it have an influence on
my pyramids ?
--
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To get things clear
1) The interpolation algorithm used by gdal_retily.py is only used for
building the pyramids when preparing your tiles. It has nothing to do do
with geoserver.
2) Are you using the imagemosaic-jdbc module ?. If this is the case, the
interpolation method is specified in the imagemosaic-jdbc config xml file.
This interpolation is used when scaling the image for an online request. If
you have problems here, please ask.
acangi wrote:
Hello,
I made several pyramids of my raster data using gdal_retile.py, I'm
testing the different resampling algorithms (near, bilinear, cubic,
cubicspline) of gdal_retile.
In Geoserver > Config > WMS > Rendering > Interpolation we have a choice
between Nearest Neighbour, Bilinear and Bicubic. I was wondering : should
this choice have an influence on the display of my pyramids, possibly
depending on the pyramid's resampling method ? I can't find any difference
when changing the interpolation method.
I wonder the same for the antialias checkbox, should it have an influence
on my pyramids ?
--
View this message in context: http://www.nabble.com/Interpolation-and-pyramids-tp22476732p22478905.html
Sent from the GeoServer - User mailing list archive at Nabble.com.
The things are clear for the difference between both. I’m not using imagemosaic-jdbc module, my pyramid levels are shapefiles of geotiffs. What I’m wondering is, taking into account the interpolation introduced by gdal_retile, do the geoserver WMS interpolation and the antialiasing provide something more ?
mcr wrote:
To get things clear 1) The interpolation algorithm used by gdal_retily.py is only used for building the pyramids when preparing your tiles. It has nothing to do do with geoserver. 2) Are you using the imagemosaic-jdbc module ?. If this is the case, the interpolation method is specified in the imagemosaic-jdbc config xml file. This interpolation is used when scaling the image for an online request. If you have problems here, please ask.
acangi wrote:
Hello, I made several pyramids of my raster data using gdal_retile.py, I’m testing the different resampling algorithms (near, bilinear, cubic, cubicspline) of gdal_retile. In Geoserver > Config > WMS > Rendering > Interpolation we have a choice between Nearest Neighbour, Bilinear and Bicubic. I was wondering : should this choice have an influence on the display of my pyramids, possibly depending on the pyramid’s resampling method ? I can’t find any difference when changing the interpolation method. I wonder the same for the antialias checkbox, should it have an influence on my pyramids ?
View this message in context: Re: Interpolation and pyramids
Sent from the GeoServer - User mailing list archive at Nabble.com.
I do not really understand what you mean. The gdal_retile.py interpolation is
used for creating the pyramids, so far, so good.
If you are requesting an image from geoserver, it is very unlikely that one
of the pyramid levels fits perfectly. Geoserver uses the pyramid level which
fits best and scales the best fit pyramid level to the pixel dimensions you
requested. The geoserver scale operation uses an interpolation method
independent from gdal_retile.py, hopefully the one you specified in the
admin app.
acangi wrote:
The things are clear for the difference between both. I'm not using
imagemosaic-jdbc module, my pyramid levels are shapefiles of geotiffs.
What I'm wondering is, taking into account the interpolation introduced by
gdal_retile, do the geoserver WMS interpolation and the antialiasing
provide something more ?
mcr wrote:
To get things clear
1) The interpolation algorithm used by gdal_retily.py is only used for
building the pyramids when preparing your tiles. It has nothing to do do
with geoserver.
2) Are you using the imagemosaic-jdbc module ?. If this is the case, the
interpolation method is specified in the imagemosaic-jdbc config xml
file. This interpolation is used when scaling the image for an online
request. If you have problems here, please ask.
acangi wrote:
Hello,
I made several pyramids of my raster data using gdal_retile.py, I'm
testing the different resampling algorithms (near, bilinear, cubic,
cubicspline) of gdal_retile.
In Geoserver > Config > WMS > Rendering > Interpolation we have a choice
between Nearest Neighbour, Bilinear and Bicubic. I was wondering :
should this choice have an influence on the display of my pyramids,
possibly depending on the pyramid's resampling method ? I can't find any
difference when changing the interpolation method.
I wonder the same for the antialias checkbox, should it have an
influence on my pyramids ?
--
View this message in context: http://www.nabble.com/Interpolation-and-pyramids-tp22476732p22493183.html
Sent from the GeoServer - User mailing list archive at Nabble.com.