Hi Ammar,
from the screenshot it seems to me like some granules are missing from the
mosaic. Is that possible? Or maybe the imagesa are overlapping?
Can you please send a screenshot with the granules seamlines on top of it?
(This is easily doable by loading the mosaic index as a vectorial layer on
GeoServer)
Alessio.
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On Sun, Jan 26, 2014 at 9:13 PM, Ammar <[email protected]> wrote:
> Hello list,
>
> The white lines problem has been solved by using a lossless compression,
> in my case LZW with a predictor of 2. Now, when I am loading the 21 images
> into a software such as QGIS, I get a perfect image (screen shot #1) but
> when I upload the images into GeoServer and put them either in a layer
> group or in an Image Mosaic, I get strips of white tiles (screen shot #2).
>
> Any ideas?
>
> //Ammar
>
> ------------------------------
> *From:* Ammar <[email protected]>
> *To:* Jonathan Moules <[email protected]>; "
> [email protected]" <
> [email protected]>
> *Sent:* Tuesday, January 21, 2014 12:40 PM
> *Subject:* Re: [Geoserver-users] White lines in merged GeoTIFF files
> after ImageMosaicing
>
> Hello Jonathan,
>
> I merged all the files in one huge BIGTIFF image (700000 x 656000) and it
> came out perfect with no gaps, lines or distortions. The problem with this
> approach is that I tried to create overviews for the image and it took 4
> continuous days of gdaladdo running without any progress until I had to
> cancel the gdaladdo operation.
>
> So, what I am saying is, the original images don't have gaps or no data in
> them. I am suspecting that the problem occurs because of gdaladdo. I have
> tested on smaller images, with and without overviews and the images that
> have no overviews came perfect with no lines or gaps!
>
> Any ideas, tips or suggestions on other options or alternatives methods to
> creating overviews by gdaladdo?
>
> //Ammar
>
> ------------------------------
> *From:* Jonathan Moules <[email protected]>
> *To:* Ammar <[email protected]>; [email protected]
> *Sent:* Tuesday, January 14, 2014 12:17 PM
> *Subject:* Re: [Geoserver-users] White lines in merged GeoTIFF files
> after ImageMosaicing
>
> Hi Ammar.
> Please keep the discussion on-list, that way prospectively others can help
> too.
>
> If the data does it in QGIS too then it's almost certainly a no-data
> issue. I can't suggest how to resolve that as I don't know anything about
> your dataset.
>
> Regards,
> Jonathan
>
>
>
> On 14 January 2014 11:10, Ammar <[email protected]> wrote:
>
> Jonathan,
>
> First, I am really sorry about the last name thing. Probably I was working
> like a mule at the time I created the post.
>
> When I load the files directly into QGIS, I get the same white lines and
> distortions. When zooming in, the lines disappear at certain levels then
> after zooming in more, I get them back! It is like they are coming and
> going. The thing is, the lines happen exactly at the borders of each of the
> 21 merged Images!
>
> Any ideas?
>
> Regards,
> Ammar
>
>
> ------------------------------
> *From:* Jonathan Moules <[email protected]>
> *To:* Ammar <[email protected]>
> *Cc:* "[email protected]" <
> [email protected]>
> *Sent:* Monday, January 13, 2014 4:44 PM
> *Subject:* Re: [Geoserver-users] White lines in merged GeoTIFF files
> after ImageMosaicing
>
> Hi Ammar,
>
> The commands that I used are: (recommended by Jonathan
> Mule)<http://osgeo-org.1560.x6.nabble.com/Tips-on-serving-Orthophotos-as-ImageMosaic-tt5093083.html#a5093104>
>
> That's an original spelling of my last name. ;-)
>
> Do the images mosaic together neatly in something like QGIS when loaded as
> separate files? There may be whitespace as Alessio says. Does the
> whitespace appear/disappear as you zoom in/out?
> Cheers,
> Jonathan
>
>
> On 12 January 2014 18:31, Ammar <[email protected]> wrote:
>
> Dear list,
>
> I have merged 21 GeoTIFF images using GDAL utilities. Each image is the
> result of merging 500 smaller tiles. I am using ImageMosaic in Geoserver
> but I am getting a mosaic that contains white lines
>
> What could be the reason behind having those white lines?
>
> The commands that I used are: (recommended by Jonathan Mule)
> <http://osgeo-org.1560.x6.nabble.com/Tips-on-serving-Orthophotos-as-ImageMosaic-tt5093083.html#a5093104>
>
>
> gdalbuildvrt -srcnodata 255 -vrtnodata 255 -a_srs EPSG:27700
> -input_file_list tiff_list.txt mosaic.vrt
>
> gdal_translate -of GTiff -co TILED=YES -co BIGTIFF=YES -co COMPRESS=JPEG
> -co JPEG_QUALITY=80 -co BLOCKXSIZE=512 -co BLOCKYSIZE=512 -co
> PHOTOMETRIC=YCBCR mosaic.vrt mosaic.tif
>
> gdaladdo mosaic.tif -r average --config COMPRESS_OVERVIEW JPEG --config
> JPEG_QUALITY_OVERVIEW 60 --config INTERLEAVE_OVERVIEW PIXEL --config
> PHOTOMETRIC_OVERVIEW YCBCR 2 4 8 16 32 64 128 256 512
>
> Thank you in advance
>
> //Ammar
>
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