[Geoserver-users] Generated ImageMosaic of NASA Bluemarble has gaps

GeoServer GeoServer User
1

Hi,

I tried to create NASA Bluemarble from 8 pieces of 21600x21600 JPEG images
that I downloaded from http://visibleearth.nasa.gov/view.php?id=74218. Below
are the steps that I used:

gdal_translate -of GTiff -co "TILED=YES" -co "BLOCKXSIZE=512" -co
"BLOCKYSIZE=512" world.200412.3x21600x21600.A1.jpg Bluemarble.A1.tif
gdal_translate -of VRT -a_srs EPSG:4326 -a_ullr -180.0 90.0 -90.0 0.0
Bluemarble.A1.tif Bluemarble.Geo.A1.tif
gdalwarp -t_srs EPSG:4326 Bluemarble.Geo.A1.tif tmp.tif
mv tmp.tif Bluemarble.Geo.A1.tif

I repeated the above steps for A1,B1,C1,D1,A2,B2,C2,D2.
Then use the following command the create a pyramid of all 8 GeoTiff images.
for file in *.tif; do
gdal_retile.py -v -r lanczos -levels 12 -ps 2048 2048 -co "TILED=YES" -co
"BLOCKXSIZE=512" -co "BLOCKYSIZE=512" -co "COMPRESS=DEFLATE"
-useDirForEachRow w -targetDir pyramid $file;
done

Not sure if the above steps are correct but the resulted image has gaps that
you can see from the attached "layerPreview" screenshot. I also attached a
screenshot that shows how the JPEG blue marble data are aligned. I hope
someone can tell me what I did wrong and show me the correct steps that can
be used to produce a correct blue marble image.

Many thanks in advance,
Best regards,
Tam
<http://osgeo-org.1560.x6.nabble.com/file/n5134778/layerpreview.jpg&gt;
<http://osgeo-org.1560.x6.nabble.com/file/n5134778/bluemarble-21600x21600.jpg&gt;

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2

Ciao Tam,
I am trying to understand what you did, but I believe you went way too far in terms of preprocessing.

I would do:

-1- gdal_translate -of GTiff -co “TILED=YES” -co “BLOCKXSIZE=512” -co
“BLOCKYSIZE=512” -a_srs EPSG:4326 -a_ullr -180.0 90.0 -90.0 0.0 world.200412.3x21600x21600.A1.jpg Bluemarble.A1.tif
-2- gdaladdo on each single tile
-3- use the ImageMosaic.

Let us know how it goes.

···

Regards,
Simone Giannecchini

Meet us at GEO Business 2014! in London! Visit http://goo.gl/fES3aK for more information.

Ing. Simone Giannecchini
@simogeo
Founder/Director

GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 333 8128928

http://www.geo-solutions.it
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On Sun, Apr 13, 2014 at 6:59 PM, tt5430 <tt9488@anonymised.com> wrote:

Hi,

I tried to create NASA Bluemarble from 8 pieces of 21600x21600 JPEG images
that I downloaded from http://visibleearth.nasa.gov/view.php?id=74218. Below
are the steps that I used:

gdal_translate -of GTiff -co “TILED=YES” -co “BLOCKXSIZE=512” -co
“BLOCKYSIZE=512” world.200412.3x21600x21600.A1.jpg Bluemarble.A1.tif
gdal_translate -of VRT -a_srs EPSG:4326 -a_ullr -180.0 90.0 -90.0 0.0
Bluemarble.A1.tif Bluemarble.Geo.A1.tif
gdalwarp -t_srs EPSG:4326 Bluemarble.Geo.A1.tif tmp.tif
mv tmp.tif Bluemarble.Geo.A1.tif

I repeated the above steps for A1,B1,C1,D1,A2,B2,C2,D2.
Then use the following command the create a pyramid of all 8 GeoTiff images.
for file in *.tif; do
gdal_retile.py -v -r lanczos -levels 12 -ps 2048 2048 -co “TILED=YES” -co
“BLOCKXSIZE=512” -co “BLOCKYSIZE=512” -co “COMPRESS=DEFLATE”
-useDirForEachRow w -targetDir pyramid $file;
done

Not sure if the above steps are correct but the resulted image has gaps that
you can see from the attached “layerPreview” screenshot. I also attached a
screenshot that shows how the JPEG blue marble data are aligned. I hope
someone can tell me what I did wrong and show me the correct steps that can
be used to produce a correct blue marble image.

Many thanks in advance,
Best regards,
Tam
<http://osgeo-org.1560.x6.nabble.com/file/n5134778/layerpreview.jpg>
<http://osgeo-org.1560.x6.nabble.com/file/n5134778/bluemarble-21600x21600.jpg>

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