[gdal-dev] Best way to mosaic and compress lots of tiff Black/white?

Mon Feb 25 02:04:46 PST 2013

Hi all
at last I found the problem
white bands must be filtered by the source, so the "-srcnodata" option must
be used.
In my case -srcnodata "0" solved the problem and all tiff images are now
mosaicked without blanc bands between them.
This is the correct command

gdalbuildvrt -hidenodata -srcnodata "0" -vrtnodata "0" test.vrt *.tif

Bie
pietro

2012/11/14 Pietro Rossin <pierigis at gmail.com>

> Sorry for the mess...
> I made an error because I thought that tiffs were RGB black and white but
> they are sigle band 1 bit images
>
> I tried to use nodata values during vrt generation like this
>
> gdalbuildvrt -hidenodata -vrtnodata "0" test.vrt *.tif
>
>
> Then mosaic tiffs with
> gdal_translate -of Gtiff -co SPARSE_OK=TRUE -a_nodata 0 -co NBITS=1 -co
> "TILED=YES" -co "COMPRESS=CCITTFAX4" -co "INTERLEAVE=BAND" -co "TFW=YES"
> "test.vrt" "test.tif"
>
> Null overlapping areas still present in the output..
>
> Where is my mistake?
>
> Here is the gdalinfo for a tiff
> *********************************************
> Driver: GTiff/GeoTIFF
> Files: 018131.tif
>        018131.tfw
>        018131.aux
> Size is 7400, 6491
> Coordinate System is `'
> Origin = (2344486.561459757400000,5168752.558307543400000)
> Pixel Size = (0.442006745841354,-0.442006746307015)
> Metadata:
>   TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)
>   TIFFTAG_SOFTWARE=IrfanView
>   TIFFTAG_XRESOLUTION=57
>   TIFFTAG_YRESOLUTION=57
> Image Structure Metadata:
>   COMPRESSION=CCITTFAX4
>   INTERLEAVE=BAND
>   MINISWHITE=YES
> Corner Coordinates:
> Upper Left  ( 2344486.561, 5168752.558)
> Lower Left  ( 2344486.561, 5165883.493)
> Upper Right ( 2347757.411, 5168752.558)
> Lower Right ( 2347757.411, 5165883.493)
> Center      ( 2346121.986, 5167318.025)
> Band 1 Block=7400x1 Type=Byte, ColorInterp=Palette
>   Description = Band_1
>   Metadata:
>     LAYER_TYPE=athematic
>   Image Structure Metadata:
>     NBITS=1
>   Color Table (RGB with 2 entries)
>     0: 255,255,255,255
>     1: 0,0,0,255
> *********************************************
>
>
> 2012/11/14 Pietro Rossin <pierigis at gmail.com>
>
>> Ok
>> I made a test VRT and I applied your gdal_translate command.
>> It work and the result is a tiff with a weight of about the sum of the
>> two test mosaiced tiffs.
>> But as you can see in this image
>>
>> http://www.flickr.com/photos/90029615@N05/8184720800/
>>
>> the two tiffs have a white orizzontal stripe that separate them.
>>  This is because each tif to be mosaiced have a white frame and every
>> frame overlap to "data" areas of adiacent images.
>>
>> If I eliminate the 255 value from original tiffs the result is like this
>> http://www.flickr.com/photos/90029615@N05/8184744636/
>>
>> I tried using -a_nodata 255 in gdal_translate command but the result is
>> the same white separation..
>>
>> How can I set 255 values to nodata before mosaic each tiff?
>>
>> Thank you very much for your help!
>> Pietro
>>
>>
>> 2012/11/13 MORREALE Jean Roc [via OSGeo.org] <[hidden email]<http://user/SendEmail.jtp?type=node&node=5016218&i=0>
>> >
>>
>>  Hi,
>>>
>>> You could start by merging all your tiff in a VRT then do
>>> gdal_translate -of Gtiff -co SPARSE_OK=TRUE -a_nodata 0 -co NBITS=1 -co
>>> "TILED=YES" -co "COMPRESS=CCITTFAX4" -co "INTERLEAVE=BAND" "example.vrt"
>>> "example.tif"
>>>
>>> Le 2012-11-13 17:14, Pietro Rossin a écrit :
>>>
>>> > Hello all
>>>
>>> > I have ~1000 tiff/tfw RGB but with only 0 or 255 color value in all
>>> > bands
>>> > (black/white).
>>> > I want to mosaic them in a single image to be used in qgis and other
>>> > gis
>>> > software.
>>> >
>>> > Which is the best way to do this? And to compress the resulting
>>> > image? May
>>> > be Tiff?? Single band??
>>> > Another problem is that I must apply a formula to input images to
>>> > transform
>>> > 255 value to null, because of some white portion of each image that
>>> > overlap
>>> > to black portion of the adiacent one..
>>> >
>>> > Thanks
>>> > Pietro
>>> Le 2012-11-13 17:14, Pietro Rossin a écrit :
>>>
>>> > Hello all
>>>
>>> > I have ~1000 tiff/tfw RGB but with only 0 or 255 color value in all
>>> > bands
>>> > (black/white).
>>> > I want to mosaic them in a single image to be used in qgis and other
>>> > gis
>>> > software.
>>> >
>>> > Which is the best way to do this? And to compress the resulting
>>> > image? May
>>> > be Tiff?? Single band??
>>> > Another problem is that I must apply a formula to input images to
>>> > transform
>>> > 255 value to null, because of some white portion of each image that
>>> > overlap
>>> > to black portion of the adiacent one..
>>> >
>>> > Thanks
>>> > Pietro
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