Well to be honest is not very easy to suggest something specific without
knowing the dataset and the environment.
One thing you can try to do is to add to the gdal_translate string also the
NODATA parameter in order to set the nodata values on the granules.
An example usage
gdal_translate -a_srs ... -a_nodata -32636 -co "TILED=YES" -co
"BLOCKXSIZE=512" -co "BLOCKYSIZE=512" in.tif out.tif
(the exact parameters/values depend on your specific needs)
Let me know if this helps to solve the issue.
==
Our support, Your Success! Visit http://opensdi.geo-solutions.it for more
information.
==
Ing. Alessio Fabiani
@alfa7691
Founder/Technical Lead
GeoSolutions S.A.S.
Via Poggio alle Viti 1187
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
-------------------------------------------------------
On Wed, Jan 29, 2014 at 12:32 PM, Ammar <[email protected]> wrote:
> Alessio,
>
> Thank you very much for your reply.
>
> Is there anyway to solve this problem? Any recommendations or suggestions?
>
> Regards,
> Ammar
>
>
> ------------------------------
> *From:* Alessio Fabiani <[email protected]>
> *To:* Ammar <[email protected]>
> *Cc:* "[email protected]" <
> [email protected]>
> *Sent:* Wednesday, January 29, 2014 10:51 AM
>
> *Subject:* Re: [Geoserver-users] White lines in merged GeoTIFF files
> after ImageMosaicing
>
> Hello Ammar,
> sorry for the delay.
>
> Looking at your screenshots my guess is that the overlapping granules may
> have the nodata not correctly setted, and in any case my understanding is
> that in your mosaic you have configured the transparency on black color but
> the white nodata sections overlapping are opaque, and so generating such
> strange white lines effect.
>
> Alessio.
>
> ==
> Our support, Your Success! Visit http://opensdi.geo-solutions.it for more
> information.
> ==
>
> Ing. Alessio Fabiani
> @alfa7691
> Founder/Technical Lead
>
> GeoSolutions S.A.S.
> Via Poggio alle Viti 1187
> 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
>
> -------------------------------------------------------
>
>
> On Mon, Jan 27, 2014 at 11:42 AM, Ammar <[email protected]> wrote:
>
> Alessio,
>
> Thank you for your reply. At first, I thought there are some granules
> missing from the mosaic but now after looking at the mosaic index, it seems
> that the images are overlapping! Please take a look at the attached screen
> shot and tell me if they are clear and I added the index the right way or
> if I need to re-take another snapshots!
>
> Regards,
> Ammar
>
>
> ------------------------------
> *From:* Alessio Fabiani <[email protected]>
>
> *To:* Ammar <[email protected]>
> *Cc:* "[email protected]" <
> [email protected]>
> *Sent:* Monday, January 27, 2014 10:06 AM
>
> *Subject:* Re: [Geoserver-users] White lines in merged GeoTIFF files
> after ImageMosaicing
>
> 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.
>
> ==
> Our support, Your Success! Visit http://opensdi.geo-solutions.it for more
> information.
> ==
>
> Ing. Alessio Fabiani
> @alfa7691
> Founder/Technical Lead
>
> GeoSolutions S.A.S.
> Via Poggio alle Viti 1187
> 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
>
> -------------------------------------------------------
>
>
> 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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