Hi Vadim,
Just wanted to say thanks for suggesting the tilers-tools package.
Over the past few weeks I've done some testing with it, and while it
has some minor quirks, I think it's overall a better solution for me.
I do still see the strange performance drop in low zoomlevels, but
since performance is overall much better, it's easier to tolerate.
I see on the Google code site that you're the project owner, so good job!
Regards,
Mladen
Quoting vadp.devl at gmail.com:
Hi Mladen,
On Fri, Dec 23, 2011 at 3:58 AM, <mladen-g at distributel.net> wrote:
> This takes about 16 seconds on my machine.
>
...
> This takes 32 seconds, or about double the time of tiling zoomlevels 1-7.
Not really an answer to your question, but if you are about a timinig
issues for you rater processing you may give a try to gdal_tiler.py
from http://code.google.com/p/tilers-tools.
Regards
Vadim
Quoting [email protected]:
Hi all,
I'm seeing some very strange performance from gdal2tiles on a
particular grid, so I'm wondering if someone has an insight into why
this is happening.
The problem is that when I tile the grid at zoom level 7, I get much
better performance than with other zoomlevels, including lower ones
(!).
The grid is this (zipped PNG, ~2.7Mb):
http://dl.dropbox.com/u/53500018/ontarioOrigSizeTrimReprojected.zip
So, let's say I run this command:
gdal2tiles.bat -w google -s EPSG:4326 -z 1-7 -v
C:\temp\ontarioOrigSizeTrimReprojected.png
C:\temp\outputTiles
This takes about 16 seconds on my machine.
But if I replace the last line to be zoom level 1:
gdal2tiles.bat -w google -s EPSG:4326 -z 1-1 -v
C:\temp\ontarioOrigSizeTrimReprojected.png
C:\temp\outputTiles
This takes 32 seconds, or about double the time of tiling zoomlevels
1-7. Note also that I've experimented with other maximum zoomlevels
(5,6,8,9,10,11) and they all run slower than 7.
So, does anyone know Why does this strange behaviour happen on zoom
level 7? And is there any way to optimize the input to gdal2tiles
for better performance?
Regards,
Mladen
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