So, looking at the GDAL_INFO output I suggest to retile internally the
granules as square tiles (e.g.: 512x512).
You can use gdal_transale -co "TILED=YES" -co "BLOCKXSIZE=512" -co
"BLOCKYSIZE=512" in order to do that. This will improve a lot the
performances.
Moreover, generally speaking, it is not advisable to have overviews with
size lower than the internal tiling. You will force the server to do
unuseful extra-work other than risk to introduce artifacts.
Therefore in this case overviews of size 512x512 are sufficient (2 4 8 16
32).
Try if it works like this.
Also, if you do the preview using an OpenLayers-like client in tiling mode,
you must be sure that the browser page zoom level is 100% otherwise it may
introduce unwanted lines in the middle at client side.
I hope it will work just following those steps, otherwise the issue may be
more serious.
Also, which versions of GeoServer and GeoTools are you using?
Best Regards,
Alessio Fabiani.
==
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==
Ing. Alessio Fabiani
@alfa7691
Founder/Technical Lead
GeoSolutions S.A.S.
Via di Montramito 3/A
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 331 6233686
http://www.geo-solutions.it
http://twitter.com/geosolutions_it
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On Thu, Apr 21, 2016 at 3:49 PM, Jason Newmoyer <
[email protected]> wrote:
> Alessio,
>
> Does having the extra overviews cause an issue? I assumed its better to
> have more than you need rather than less. Since at a factor of 64 or beyond
> they really cost almost nothing in terms of processing or space.
>
> Here is the gdalinfo for one of my tiles.
>
> Driver: GTiff/GeoTIFF
> Files: test123456789.tif
> Size is 16384, 16384
> Coordinate System is:
> GEOGCS["WGS 84",
> DATUM["WGS_1984",
> SPHEROID["WGS 84",6378137,298.257223563,
> AUTHORITY["EPSG","7030"]],
> AUTHORITY["EPSG","6326"]],
> PRIMEM["Greenwich",0],
> UNIT["degree",0.0174532925199433],
> AUTHORITY["EPSG","4326"]]
> Origin = (40.614871499950851,6.385383283001418)
> Pixel Size = (0.000004499999999,-0.000004500000000)
> Metadata:
> -------------------
> Image Structure Metadata:
> COMPRESSION=YCbCr JPEG
> INTERLEAVE=PIXEL
> SOURCE_COLOR_SPACE=YCbCr
> Corner Coordinates:
> Upper Left ( 40.6148715, 6.3853833)
> Lower Left ( 40.6148715, 6.3116553)
> Upper Right ( 40.6885995, 6.3853833)
> Lower Right ( 40.6885995, 6.3116553)
> Center ( 40.6517355, 6.3485193)
> Band 1 Block=16384x512 Type=Byte, ColorInterp=Red
> Overviews: 8192x8192, 4096x4096, 2048x2048, 1024x1024, 512x512, 256x256,
> 128x128
> Band 2 Block=16384x512 Type=Byte, ColorInterp=Green
> Overviews: 8192x8192, 4096x4096, 2048x2048, 1024x1024, 512x512, 256x256,
> 128x128
> Band 3 Block=16384x512 Type=Byte, ColorInterp=Blue
> Overviews: 8192x8192, 4096x4096, 2048x2048, 1024x1024, 512x512, 256x256,
> 128x128
>
>
>
> Jason Newmoyer
> Newmoyer Geospatial Solutions
> 843.606.0424
> [email protected]
>
>
>
>>
>>
>
------------------------------------------------------------------------------
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