<div dir="ltr">Hi,<div>I've exported a TIFF to geopackage raster, and noticed that while the exported data only cover</div><div>zoom level 7, the tile matrix definition ranges from 0 to 7.</div><div><br></div><div>From the reader point of view, it seems that in order to get the effectively populated tile</div><div>matrix levels one would have to run a select distinct on the zoom level in the tile table,</div><div>which seems rather inefficient.</div><div><br></div><div>I checked the spec and while it demands a tile matrix spec for populated levels, it does not</div><div>seem to require omitting it for non populated levels. Can you confirm?</div><div><br></div><div>I think I'm seeing in the code a check verifying that indeed at least one tile is present before</div><div>listing a particular zoom level:</div><div><br></div><div><div>// In read-only mode, only lists non empty zoom levels</div><div> else if( !bUpdate )</div><div> {</div><div> osSQL += CPLSPrintf(" AND EXISTS(SELECT 1 FROM %s WHERE zoom_level = tm.zoom_level LIMIT 1)",</div><div> osQuotedTableName.c_str());</div><div> }</div><div> </div></div><div>Cheers</div><div>Andrea</div><div><br><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><span><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><font size="2"><span style="font-family:Arial;vertical-align:baseline;white-space:pre-wrap">==</span><span style="font-family:Arial;vertical-align:baseline;white-space:pre-wrap"><br></span><span style="font-family:Arial;vertical-align:baseline;white-space:pre-wrap">GeoServer Professional Services from the experts! 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