Hi Wolfgang
The map should be always visible in the lower zoom levels. And you can enforce
visibility in the properties.
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"
Note the "has overviews true"
HTH
Oliver
Am Sonntag, 6. August 2017, 13:27:25 CEST schrieb WT:
> Hi Mitxel, hi Oliver,
>
> Mitxel described in this thread a method to display ECW maps in QMS.
>
> My ECW map file works as expected in QGIS and has the following features:
>
> .\gdal\apps>gdalinfo EuFC06Complet.ecw
>
> Driver: ECW/ERDAS Compressed Wavelets (SDK 3.x)
> Files: EuFC06Complet.ecw
> Size is 9240, 9450
> Coordinate System is:
> GEOGCS["WGS 84",
> DATUM["WGS_1984",
> SPHEROID["WGS 84",6378137,298.257223563,
> AUTHORITY["EPSG","7030"]],
> TOWGS84[0,0,0,0,0,0,0],
> AUTHORITY["EPSG","6326"]],
> PRIMEM["Greenwich",0,
> AUTHORITY["EPSG","8901"]],
> UNIT["degree",0.0174532925199433,
> AUTHORITY["EPSG","9108"]],
> AXIS["Lat",NORTH],
> AXIS["Long",EAST],
> AUTHORITY["EPSG","4326"]]
> Origin = (-25.000000000000000,72.000000000000000)
> Pixel Size = (0.007142857142857,-0.004761904761905)
> Metadata:
> COLORSPACE=RGB
> COMPRESSION_RATE_TARGET=8
> VERSION=2
> Corner Coordinates:
> Upper Left ( -25.0000000, 72.0000000) ( 25d 0' 0.00"W, 72d 0' 0.00"N)
> Lower Left ( -25.0000000, 27.0000000) ( 25d 0' 0.00"W, 27d 0' 0.00"N)
> Upper Right ( 41.0000000, 72.0000000) ( 41d 0' 0.00"E, 72d 0' 0.00"N)
> Lower Right ( 41.0000000, 27.0000000) ( 41d 0' 0.00"E, 27d 0' 0.00"N)
> Center ( 8.0000000, 49.5000000) ( 8d 0' 0.00"E, 49d30' 0.00"N)
> Band 1 Block=256x256 Type=Byte, ColorInterp=Red
> Description = Red
> Overviews: 4620x4725, 2310x2362, 1155x1181, 577x590, 288x295, 144x147
> Band 2 Block=256x256 Type=Byte, ColorInterp=Green
> Description = Green
> Overviews: 4620x4725, 2310x2362, 1155x1181, 577x590, 288x295, 144x147
> Band 3 Block=256x256 Type=Byte, ColorInterp=Blue
> Description = Blue
> Overviews: 4620x4725, 2310x2362, 1155x1181, 577x590, 288x295, 144x147
>
> The VRT derived from this file has similar properties.
>
> In the thread
> https://sourceforge.net/p/qlandkartegt/mailman/message/35983832/
>
> there is the following hint:
>
> "In the current release version the map has to be single banded (color
> table), to make it work. With commit
> 43b0987e30695ced81dfe34f8d82f4ec2ec6036d it works for other maps, too."
>
> My QMS version is 4e3e7bbcdc7c and thus newer than the one mentioned
above.
>
> Could the single band requirement be the reason for not getting the
> given ECW map displayed in QMS (using Mitxels recommendations!)?
>
> Is the phrase "With commit 43b0987... it works for other maps, too"
> consistent with the description "VRT: Always test 1st band for
> overviews" of this commit?
>
> Which properties should an ECW (or similarly MBTILES) file have in order
> to display it properly in QMS?
>
> Thanks for your comments.
>
> WolfgangTh
>
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