Hi Oliver,
thanks for your comment.
Am 06.08.2017 um 13:49 schrieb Oliver Eichler:
Hi Wolfgang
The map should be always visible in the lower zoom levels. And you can
enforce visibility in the properties.
No chance! Even after adding an overview map. With your gdaladdo command
I get an additional euecw.vrt.ovr file in the same folder as the vrt
file. The same happens without the -ro option. More useful gdaladdo
options I couldn't find. And the QMS log tells:
2017-08-06 16:44:24.950 [debug] VRT: try to open "D:/GPS/Maps/euecw.vrt"
2017-08-06 16:44:24.951 [debug] has overviews false
2017-08-06 16:44:24.951 [debug] FF QTransform(type=TxScale,
11=0.000124666 12=0 13=0 21=0 22=-8.31109e-05 23=0 31=-0.436332
32=1.25664 33=0.0174533)
2017-08-06 16:44:24.951 [debug] RR QTransform(type=TxScale, 11=8021.41
12=0 13=0 21=0 22=-12032.1 23=0 31=3500 32=15120 33=1)
Adding an overview directly to the ECW file is not supported.
Checking with ProcessMonitor the files loaded by QMS I find the vrt file
but the ovr file is not touched/loaded.
By the way: Converting ECW to GTIFF and using the GTIFF doesn't cause
any problems.
If your map has overviews QMS will report something like
2017-08-06 13:46:46.504 [debug] VRT: try to open
"/home/MapRoom/Pustertal_50K.vrt" 2017-08-06 13:46:46.506 [debug] has
overviews true 2017-08-06 13:46:46.506 [debug] FF
QTransform(type=TxScale, 11=4.62818 12=0 13=0 21=0 22=-4.62818 23=0
31=1.31383e+06 32=5.90459e+06 33=1) 2017-08-06 13:46:46.506 [debug] RR
QTransform(type=TxScale, 11=0.216068 12=0 13=0 21=0 22=-0.216068 23=0
31=-283876 32=1.27579e+06 33=1)
Note the "has overviews true"
HTH
Oliver
https://lists.sourceforge.net/lists/listinfo/qlandkartegt-users
Regards
WolfgangTh
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