https://issues.qgis.org/https://issues.qgis.org/favicon.ico2017-10-01T23:24:24ZQGIS Issue TrackingQGIS Application - Feature request #17219: Better description of bandshttps://issues.qgis.org/issues/17219?journal_id=832722017-10-01T23:24:24ZNyall Dawson
<ul><li><strong>Status</strong> changed from <i>Open</i> to <i>Feedback</i></li></ul><p>Can you share one of these files?</p> QGIS Application - Feature request #17219: Better description of bandshttps://issues.qgis.org/issues/17219?journal_id=832752017-10-02T07:09:32ZPaolo Cavallinicavallini@faunalia.it
<ul></ul><p><a class="external" href="http://www.faunalia.eu/~paolo/grib.zip">http://www.faunalia.eu/~paolo/grib.zip</a><br />Thanks.<br />BTW: I do not know whether this is a general issue, but the projection for this particular file (EPSG:4326) is not correctly interpreted.</p> QGIS Application - Feature request #17219: Better description of bandshttps://issues.qgis.org/issues/17219?journal_id=857062018-01-09T12:01:21ZPaolo Cavallinicavallini@faunalia.it
<ul></ul><p>Misinterpretation of EPSG code confirmed with other GRIBs from other sources.</p> QGIS Application - Feature request #17219: Better description of bandshttps://issues.qgis.org/issues/17219?journal_id=858552018-01-16T14:46:41ZGiovanni Manghigiovanni.manghi@gmail.com
<ul><li><strong>File</strong> <a href="/attachments/download/11938/Screenshot_20180116_144439.png">Screenshot_20180116_144439.png</a> added</li></ul><p>Paolo Cavallini wrote:</p>
<blockquote>
<p>Misinterpretation of EPSG code confirmed with other GRIBs from other sources.</p>
</blockquote>
<p>here on 2.18.* and gdal 2.2.2:</p>
<p>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.</p> QGIS Application - Feature request #17219: Better description of bandshttps://issues.qgis.org/issues/17219?journal_id=858562018-01-16T15:04:21ZPaolo Cavallinicavallini@faunalia.it
<ul></ul><p>Confirmed, thanks for checking. As mentioned in mailing list, GRIBS dowloaded and correctly visualized in ZyGrib are not projected correctly, see <a class="external" href="http://www.faunalia.eu/~paolo/grib2.bz2">http://www.faunalia.eu/~paolo/grib2.bz2</a><br />This is outside the scope of the current ticket however.</p> QGIS Application - Feature request #17219: Better description of bandshttps://issues.qgis.org/issues/17219?journal_id=858782018-01-17T12:16:07ZGiovanni Manghigiovanni.manghi@gmail.com
<ul></ul><p>Paolo Cavallini wrote:</p>
<blockquote>
<p>Confirmed, thanks for checking. As mentioned in mailing list, GRIBS dowloaded and correctly visualized in ZyGrib are not projected correctly, see <a class="external" href="http://www.faunalia.eu/~paolo/grib2.bz2">http://www.faunalia.eu/~paolo/grib2.bz2</a><br />This is outside the scope of the current ticket however.</p>
</blockquote>
<p>gdalinfo reports messages like</p>
<p>Band 1206 Block=109x1 Type=Float64, ColorInterp=Undefined<br /> Description = 0[-] SFC (Ground or water surface)<br />Un-handled possible ensemble section center 58 subcenter 0<br />Warning 1: Band 1206 of GRIB dataset is 130x99, while the first band and dataset is 109x89. <strong>Georeferencing of band 1206 may be incorrect, and data access may be incomplete.</strong><br /> NoData Value=9999<br /> Metadata:<br /> GRIB_COMMENT=undefined [-]<br /> GRIB_ELEMENT=var155<br /> GRIB_FORECAST_SECONDS=345600 sec<br /> GRIB_REF_TIME= 1515456000 sec UTC<br /> GRIB_SHORT_NAME=0-SFC<br /> GRIB_UNIT=[-]<br /> GRIB_VALID_TIME= 1515801600 sec UTC</p>
<p>so I would say it is GDAL or zygrib problem.</p> QGIS Application - Feature request #17219: Better description of bandshttps://issues.qgis.org/issues/17219?journal_id=858952018-01-17T19:56:36ZNyall Dawson
<ul><li><strong>Resolution</strong> set to <i>up/downstream</i></li></ul> QGIS Application - Feature request #17219: Better description of bandshttps://issues.qgis.org/issues/17219?journal_id=859002018-01-18T07:33:22ZPaolo Cavallinicavallini@faunalia.it
<ul><li><strong>Resolution</strong> deleted (<del><i>up/downstream</i></del>)</li></ul><p>We are mixing up things here, my fault.<br />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<br />2. wrong extent: brilliantly clarified by Giovanni, thanks<br />3. description of bands: remains valid, it' a QGIS GUI issue, possibly not too difficult.<br />Thanks all for feedback.</p> QGIS Application - Feature request #17219: Better description of bandshttps://issues.qgis.org/issues/17219?journal_id=859032018-01-18T10:24:43ZPaolo Cavallinicavallini@faunalia.it
<ul></ul><p>For reference: <a class="external" href="http://www.zygrib.org/forum/viewtopic.php?f=3&t=1069">http://www.zygrib.org/forum/viewtopic.php?f=3&t=1069</a></p> QGIS Application - Feature request #17219: Better description of bandshttps://issues.qgis.org/issues/17219?journal_id=859042018-01-18T10:30:06ZPaolo Cavallinicavallini@faunalia.it
<ul></ul><p>Projection issue seems due to Zygrib, in any case not to QGIS:</p>
<p>Driver: GRIB/GRIdded Binary (.grb)<br />Files: ECMWF0100_2017030100_000.grb<br />Size is 181, 161<br />Coordinate System is:<br />GEOGCS["Coordinate System imported from GRIB file",<br /> DATUM["unknown",<br /> SPHEROID["Sphere",6367470,0]],<br /> PRIMEM["Greenwich",0],<br /> UNIT["degree",0.0174532925199433]]<br />Origin = (1.950000000000000,50.049999999999997)<br />Pixel Size = (0.100000000000000,-0.100000000000000)<br />Corner Coordinates:<br />Upper Left ( 1.9500000, 50.0500000) ( 1d57' 0.00"E, 50d 3' 0.00"N)<br />Lower Left ( 1.9500000, 33.9500000) ( 1d57' 0.00"E, 33d57' 0.00"N)<br />Upper Right ( 20.0500000, 50.0500000) ( 20d 3' 0.00"E, 50d 3' 0.00"N)<br />Lower Right ( 20.0500000, 33.9500000) ( 20d 3' 0.00"E, 33d57' 0.00"N)<br />Center ( 11.0000000, 42.0000000) ( 11d 0' 0.00"E, 42d 0' 0.00"N)</p> QGIS Application - Feature request #17219: Better description of bandshttps://issues.qgis.org/issues/17219?journal_id=859062018-01-18T10:40:33ZPaolo Cavallinicavallini@faunalia.it
<ul></ul><p>So we can go back to the original issue: showing in the name of bands also their description, as reported by GDAL, to make it easier for users to interpret and symbolize data.</p> QGIS Application - Feature request #17219: Better description of bandshttps://issues.qgis.org/issues/17219?journal_id=874832018-02-24T14:21:11ZPaolo Cavallinicavallini@faunalia.it
<ul><li><strong>Status</strong> changed from <i>Feedback</i> to <i>Open</i></li></ul> QGIS Application - Feature request #17219: Better description of bandshttps://issues.qgis.org/issues/17219?journal_id=914242018-08-10T07:56:56ZSaber Razmjooeisaber.razmjooei@lutraconsulting.co.uk
<ul><li><strong>Related to</strong> <i><a class="issue tracker-1 status-5 priority-4 priority- closed" href="/issues/19586">Bug report #19586</a>: Problem reading grib file</i> added</li></ul> QGIS Application - Feature request #17219: Better description of bandshttps://issues.qgis.org/issues/17219?journal_id=914452018-08-10T12:29:00ZSaber Razmjooeisaber.razmjooei@lutraconsulting.co.uk
<ul></ul><p>It works fine in QGIS master when loading the layer as mesh:<br /><a class="external" href="https://issues.qgis.org/issues/19586">https://issues.qgis.org/issues/19586</a><br /><a class="external" href="https://issues.qgis.org/attachments/download/13105/grib.png">https://issues.qgis.org/attachments/download/13105/grib.png</a></p> QGIS Application - Feature request #17219: Better description of bandshttps://issues.qgis.org/issues/17219?journal_id=915332018-08-13T08:42:23ZGiovanni Manghigiovanni.manghi@gmail.com
<ul><li><strong>Status</strong> changed from <i>Open</i> to <i>Feedback</i></li></ul> QGIS Application - Feature request #17219: Better description of bandshttps://issues.qgis.org/issues/17219?journal_id=915372018-08-13T09:08:59ZPaolo Cavallinicavallini@faunalia.it
<ul><li><strong>Status</strong> changed from <i>Feedback</i> to <i>Closed</i></li><li><strong>Resolution</strong> set to <i>fixed/implemented</i></li></ul><p>Confirmed, thanks.</p>