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 ammar83_h@anonymised.com
To: Jonathan Moules jonathanmoules@anonymised.com; “geoserver-users@anonymised.comeforge.net” geoserver-users@lists.sourceforge.net
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 jonathanmoules@anonymised.com
To: Ammar ammar83_h@anonymised.com; geoserver-users@anonymised.comurceforge.net
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 <ammar83_h@anonymised.com> 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 <jonathanmoules@anonymised.com>
To: Ammar <ammar83_h@anonymised.com>
Cc: “geoserver-users@lists.sourceforge.net” <geoserver-users@lists.sourceforge.net>
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)
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 <ammar83_h@anonymised.com> 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)
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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