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<p class="MsoNormal"><span style="font-size:11.0pt;color:#003285">Dear List Members</span><span style="font-size:11.0pt;color:windowtext">,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext">I have a problem with labeling polygon-features using expressions. I want to create different label-classes depending on the area of the geometries (cities, villages, etc.). In
most cases, this works quite well but in some cases I get weird effects as some labels disappear on certain scale-levels or get placed on parts of the geometries that don’t really make sense.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext">Looking for a reason for that behavior, I found out that geometry-functions deliver very different values depending on the current scale level.</span><span lang="EN-US" style="font-size:11.0pt;color:#003285">
</span><span lang="EN-US" style="font-size:11.0pt;color:windowtext">For </span><span lang="EN-US" style="font-size:11.0pt;color:#003285">getting</span><span lang="EN-US" style="font-size:11.0pt;color:windowtext"> some examples, I labeled one feature with the
following expression:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext">'xmax: ' + to_string(format_number(x_max($geometry), 0)) +' m; ' + 'area: '+ to_string(format_number(to_real($area),0)) + ' m2'<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#003285">results</span><span lang="EN-US" style="font-size:11.0pt;color:windowtext">:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext">On scale 1:50,000: 'xmax</span><span lang="EN-US" style="font-size:11.0pt;color:#003285">:</span><span lang="EN-US" style="font-size:11.0pt;color:windowtext"> 4,479,481 m</span><span lang="EN-US" style="font-size:11.0pt;color:#003285">;</span><span lang="EN-US" style="font-size:11.0pt;color:windowtext">
area</span><span lang="EN-US" style="font-size:11.0pt;color:#003285">:</span><span lang="EN-US" style="font-size:11.0pt;color:windowtext"> 232,526,142 m</span><span lang="EN-US" style="font-size:11.0pt;color:#003285">2</span><span lang="EN-US" style="font-size:11.0pt;color:windowtext">'<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext">On scale 1:100,000: 'xmax</span><span lang="EN-US" style="font-size:11.0pt;color:#003285">:</span><span lang="EN-US" style="font-size:11.0pt;color:windowtext"> 4,479,481
</span><span lang="EN-US" style="font-size:11.0pt;color:#003285">m; </span><span lang="EN-US" style="font-size:11.0pt;color:windowtext">area</span><span lang="EN-US" style="font-size:11.0pt;color:#003285">:</span><span lang="EN-US" style="font-size:11.0pt;color:windowtext">
5,343,813</span><span lang="EN-US" style="font-size:11.0pt;color:#003285"> m2</span><span lang="EN-US" style="font-size:11.0pt;color:windowtext">'<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext">On scale 1:800,000: 'xmax</span><span lang="EN-US" style="font-size:11.0pt;color:#003285">:</span><span lang="EN-US" style="font-size:11.0pt;color:windowtext"> 4,479,431</span><span lang="EN-US" style="font-size:11.0pt;color:#003285">
m;</span><span lang="EN-US" style="font-size:11.0pt;color:windowtext"> area</span><span lang="EN-US" style="font-size:11.0pt;color:#003285">:</span><span lang="EN-US" style="font-size:11.0pt;color:windowtext"> 4,885,325</span><span lang="EN-US" style="font-size:11.0pt;color:#003285">
m2</span><span lang="EN-US" style="font-size:11.0pt;color:windowtext">'<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:#003285">I can send screenshots if needed.</span><span lang="EN-US" style="font-size:11.0pt;color:windowtext"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext">With ‘identify features’ tool, I get an area of 232,528,728 square meters, which suggests that $area at scale 1:50,000 is almost correct.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext">General info: I’m working with QGIS 2.14, geometries come from a PostGIS-server, geometries and project use CRS DHDN / Gauss-Kruger zone 4 (EPSG:31468), the features I want to
label are multipart polygons (I get the same effects using non-multipart features).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext">Does anyone have an idea if I may have missed some settings that cause the mentioned effects? O</span><span lang="EN-US" style="font-size:11.0pt;color:#003285">r</span><span lang="EN-US" style="font-size:11.0pt;color:windowtext">
may it be a bug in the geometry functions?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext">Thanks a lot for any help!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext">Best regards<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:windowtext;mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:DE">Benjamin Fünfer-Königstein<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:windowtext;mso-fareast-language:DE">S-IP-AN-TG Techn.
</span><span style="color:windowtext;mso-fareast-language:DE">Geschäftsfelder<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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