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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">$length gives the same result as length($geometry)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Michel<br>
<br>
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="NL" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Van:</span></b><span lang="NL" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Springfield Harrison [mailto:stellargps@gmail.com]
<br>
<b>Verzonden:</b> vrijdag 18 mei 2018 2:52<br>
<b>Aan:</b> Michel Stuyts <michel.stuyts@edegem.be><br>
<b>CC:</b> qgis-user <qgis-user@lists.osgeo.org><br>
<b>Onderwerp:</b> Re: [Qgis-user] results Measure Tool vs. length()<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p>Interesting and alarming observation.<o:p></o:p></p>
<p>And how do those results compare with output from the $length variable?<o:p></o:p></p>
<p>Cheers . . . . . Springfield<br>
Samsung Tab 4<o:p></o:p></p>
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<p class="MsoNormal">On May 17, 2018 5:26 AM, "Michel Stuyts" <<a href="mailto:michel.stuyts@edegem.be">michel.stuyts@edegem.be</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">In the length() function QGIS uses the CRS unit of the layer to calculate the result. When I use for example a layer in a local CRS like EPSG:31370 or EPSG:5439
and a layer in EPSG:3857 (that all use meters as unit) the results are very different (+40% difference). Changing the project CRS makes no difference. When I check the length using the Measure Tool the results are very similar to the local CRS.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">How can I measure the length of a line and use it as a label independent from the layer CRS and get results similar to the results of the Measure Tool?</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Michel</span><o:p></o:p></p>
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