[mapserver-users] Raster Display Performance

[Robert Sanson]

Hi Zsolt
 
Before you use gdaladdo, I would make sure that the internal structure on your TIFF files is tile based. You can use gdalinfo to check. If not, use gdal_translate to turn into a tile structure:
 
gdal_translate -of GTiff -co TILED=YES -co BLOCKXSIZE=64 -co BLOCKYSIZE=64 input.tif output.tif
 
After that use gdaladdo:
 
gdaladdo -r average abc.tif 2 4 8 16
 
You should repeat this for every TIF image you have.
 
Thirdly, create your index file using gdaltindex
 
Finally, use shptree to create a spatial index on your index Shape file:
 
shptree index.shp
 
regards,
 
Robert


>>> Medve Zsolt <medvezs84 at gmail.com> 8/03/2010 8:46 a.m. >>>
Hy all!

I would like to ask for a help. I have a dataset. 30 pieces of Tif file, 
aproximately 240 MB each.
I make a layer in the map file:

         LAYER
             NAME "something"
             STATUS ON
             TILEINDEX "sh.shp"
             TILEITEM "Location"
             TYPE RASTER

             METADATA
                 "DESCRIPTION"   "Something too"
                 "ows_title"     "dem"
             END
         END

I use this in the pmapper framework.(But its doing the same thing in 
ka-map either) But its apeaars very slowly and when i panning its reload 
all and its very slowly too.. i would like to tune up the performance 
somwhow.
I am looking the gdaladdo program, because mapserver documentation 
suggest it. But when i tried the given examples 
(http://www.gdal.org/gdaladdo.html) it wont work, or i dont know what to 
see, Its just do nothing i think..

Can anybody help me on this? Or any method to make a better performance? 
please!

thanks,
Zsolt



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