[Gdal-dev] gtiff file size compared to original tiff +wrld file

[TJMartin]

Hi christian

many thanks for your help, i will run this later on today/overnight :)

I saw that Geoserver tutorail using the database to store the files but
think i will stick with using just files.

will postback later on if and when i get it all running

thanks again

Tim



Christian Müller wrote:
> 
> Hi, I did this process last year many times and here is my experience 
> 
> 1) I assume you omitted the create options, your original tiff files are 
> compressed, the new ones not.
> Look here http://www.gdal.org/frmt_gtiff.html, on the commandline it is 
> -co 
> "COMPRESS=JPEG" as an example. 
> 
> 2) Take a look at your tiles with gdalinfo, do the have a color table or 
> more bands ?. If your tiles have
> more bands, (e. g. one for read, one for green and one for blue), use 
> gdal_merge.py with -pct to produce a big picture
> having only one band and a color table. Create your tiles from the big 
> picture. Geoserver will say thank you in terms
> of memory usage and cpu performance. 
> 
> 3) Decide, wich Geoserver module to use. There are 2 of them. There is a 
> file based approach and a jdbc based
> approach (Module imagemosic-jdbc). If you want to store the whole stuff in
> a 
> database, use gdal_retile.py to procude your
> tiles and pyramids and the imagemosic-jdbc module to import all the tiles. 
> Both, gdal_retily.py and the imagemosaic-jdbc
> module were developed by me, if you have questions, ask. 
> 
> The documentation is here 
> http://docs.codehaus.org/display/GEOTDOC/Image+Mosaicing+Pyramidal+JDBC+Plug 
> in
> A tutorial for geoserver is here 
> http://geoserver.org/display/GEOSDOC/Using+the+ImageMosaic+JDBC+Plugin 
> 
> christian 
> 
> 
> TJMartin writes: 
> 
>> 
>> Hi All 
>> 
>> I am just getting started with gdal, and i have done a search but couldnt
>> find an answer. 
>> 
>> I currently have 10,000 tiff files with their world files. My real aim is
>> to
>> tile them up and make them easier to use in Geoserver or create an image
>> pyramid. 
>> 
>> So i used gdal_translate to Geotiff, then was going to use gdalwarp to
>> mosaic, then tile them. 
>> 
>> However the file size for geotiffs are between 4 and 15 times the size 
>> 
>> 4mb to 60mb 
>> 
>> One set were originally 128mb and now 858mb. 
>> 
>> So if i was to mosiac these and then tile them it will still be a huge
>> data/size volume to server via geoserver. 
>> 
>> 
>> So my questions 
>> 
>> 1) Can i reduce the quality when translating to geotiff, and how much
>> will
>> this affect the image quality when i mosaic and tile 
>> 
>> 2) Should i mosaic the tiff + world files instead and then tile them with
>> world files instead of using geotiffs 
>> 
>> 3) is there  a better way of doing this? 
>> 
>> would really appreciate anyone's help 
>> 
>> all the best 
>> 
>> Tim 
>> 
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