Feature request #17219
Better description of bands
|Pull Request or Patch supplied:||No||Resolution:||fixed/implemented|
|Easy fix?:||No||Copied to github as #:||25118|
Some multiband fornmat (I have checked especialli GRIB) have a description in the metadata for the meaning of each band (e.g. wind speed 10 m above ground). In the layer properties > Style, only the band numbers are listed (band 1 etc.).
This makes styling very difficult. It would seem reasonable to add the metadata to the band number, e.g.:
Band 1 (wind speed 10 m above ground)
#4 Updated by Giovanni Manghi over 3 years ago
- File Screenshot_20180116_144439.png added
Paolo Cavallini wrote:
Misinterpretation of EPSG code confirmed with other GRIBs from other sources.
here on 2.18.* and gdal 2.2.2:
both gdal (and qgis) read a custom CRS (+proj=longlat +a=6367470 +b=6367470 +no_defs) but this definitely seems to reproject to the right place, see attached image.
#6 Updated by Giovanni Manghi over 3 years ago
Paolo Cavallini wrote:
Confirmed, thanks for checking. As mentioned in mailing list, GRIBS dowloaded and correctly visualized in ZyGrib are not projected correctly, see http://www.faunalia.eu/~paolo/grib2.bz2
This is outside the scope of the current ticket however.
gdalinfo reports messages like
Band 1206 Block=109x1 Type=Float64, ColorInterp=Undefined
Description = 0[-] SFC (Ground or water surface)
Un-handled possible ensemble section center 58 subcenter 0
Warning 1: Band 1206 of GRIB dataset is 130x99, while the first band and dataset is 109x89. Georeferencing of band 1206 may be incorrect, and data access may be incomplete.
GRIB_REF_TIME= 1515456000 sec UTC
GRIB_VALID_TIME= 1515801600 sec UTC
so I would say it is GDAL or zygrib problem.
#8 Updated by Paolo Cavallini over 3 years ago
- Resolution deleted (
We are mixing up things here, my fault.
1. the projection issue: unclear whether this is due to QGIS misinterpreting EPSG:4326 or Zygrib/GDAL providing invalid projection; I will do more research
2. wrong extent: brilliantly clarified by Giovanni, thanks
3. description of bands: remains valid, it' a QGIS GUI issue, possibly not too difficult.
Thanks all for feedback.
#9 Updated by Paolo Cavallini over 3 years ago
For reference: http://www.zygrib.org/forum/viewtopic.php?f=3&t=1069
#10 Updated by Paolo Cavallini over 3 years ago
Projection issue seems due to Zygrib, in any case not to QGIS:
Driver: GRIB/GRIdded Binary (.grb)
Size is 181, 161
Coordinate System is:
GEOGCS["Coordinate System imported from GRIB file",
Origin = (1.950000000000000,50.049999999999997)
Pixel Size = (0.100000000000000,-0.100000000000000)
Upper Left ( 1.9500000, 50.0500000) ( 1d57' 0.00"E, 50d 3' 0.00"N)
Lower Left ( 1.9500000, 33.9500000) ( 1d57' 0.00"E, 33d57' 0.00"N)
Upper Right ( 20.0500000, 50.0500000) ( 20d 3' 0.00"E, 50d 3' 0.00"N)
Lower Right ( 20.0500000, 33.9500000) ( 20d 3' 0.00"E, 33d57' 0.00"N)
Center ( 11.0000000, 42.0000000) ( 11d 0' 0.00"E, 42d 0' 0.00"N)
#14 Updated by Saber Razmjooei almost 3 years ago
It works fine in QGIS master when loading the layer as mesh: