Hello Maciej:
Maciej Sieczka wrote:
Micha Silver pisze:
I can't seem to create pyramids with 0.11. Neither on Windows nor on
Ubuntu.
Regarding rendering perfomance - try to create a TIFF without tiles
(gdal_translate -co "TILED=NO" -co "BLOCKYSIZE=1"). At least for me,
Many thanks! Your suggestion certainly helped. It seems that giving the
explicit "TILED=NO" option creates a stripped tiff that loads *much*
faster. And zooming was very good also. (BTW I didn't use BLOCKYSIZE=1
as that gave an error ).
In the gdal_translate docs it says that the default (with no TILED=
option) is stripped tiff, but that doesn't seem to be the case? When I
created tiffs with no TILED option they loaded quite slowly. Then I
added the TILED=YES, and still the images loaded and zoomed slowly.
TILED=NO gave a dramatic improvement.
Anybody knows why QGIS renders tiled rasters without pyramids so slow?
But when I try to create pyramids, it seems to be working for a
while, then the process ends. But there is no change to the file, and
if I reopen the properties window to the Pyramids tab, all pixel
levels are still marked in red. The tiff's are in my homedir so, yes,
I have write access.
Can anyone else confirm this?
For me building pyramids in QGIS works OK.
Furthermore, I see that with stripped, non-tiled tiff's, I can create
pyramids in QGIS with no problem. Previously, when I used TILED=YES in
gdal_translate, the Create Pyramids didn't do anything. I suppose you
wouldn't want or need both tiled tiff and pyramids so maybe it's a
feature that zoom levels are not duplicated?
Maciek
Thanks,
Micha
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