<div dir="ltr"><div>Hi,</div><div>There might be more information in the <b>Info</b> drop-down menu. Expand it, please.</div><div><br></div><div>Harrissou<br></div></div><br><div class="gmail_quote"><div dir="ltr">Le jeu. 27 sept. 2018 à 16:55, Ben Hur Pintor <<a href="mailto:bnhr.dev@gmail.com">bnhr.dev@gmail.com</a>> a écrit :<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi everyone.<div><br></div><div>I apologize if this has been asked before but I would just like to clarify if this is how the buffer algorithm in QGIS should function.</div><div><br></div><div><b>Issue:</b> The actual distance from the input layer to the buffer polygon created by the Buffer processing tool (and v.buffer) is not equal (only around 80%) to the Distance parameter provided in the said tool.</div><div><br></div><div><b>Example:</b> My coordinate reference system is WGS84/UTM Zone 51N (EPSG: 32651). I create a 100m buffer around a point but when I measure the resulting circle, its edge is only ~80m from the point (see buffer-point and buffer-point-distance below).</div><div><br><div class="gmail_chip gmail_drive_chip" style="width:396px;height:18px;max-height:18px;background-color:#f5f5f5;padding:5px;color:#222;font-family:arial;font-style:normal;font-weight:bold;font-size:13px;border:1px solid #ddd;line-height:1"><a href="https://drive.google.com/file/d/1SAptLcRKnGVc8zyESkl-sJZ23a5OWEsy/view?usp=drive_web" style="display:inline-block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-decoration:none;padding:1px 0px;border:none;width:100%" target="_blank"><img style="vertical-align:bottom;border:none" src="https://drive-thirdparty.googleusercontent.com/16/type/image/png"> <span dir="ltr" style="color:#15c;text-decoration:none;vertical-align:bottom">buffer-point.png</span></a></div><br></div><div class="gmail_chip gmail_drive_chip" style="width:396px;height:18px;max-height:18px;background-color:#f5f5f5;padding:5px;color:#222;font-family:arial;font-style:normal;font-weight:bold;font-size:13px;border:1px solid #ddd;line-height:1"><a href="https://drive.google.com/file/d/1aQ0mfadGnEzISkPnu-GGX9SUu1GXhGMs/view?usp=drive_web" style="display:inline-block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-decoration:none;padding:1px 0px;border:none;width:100%" target="_blank"><img style="vertical-align:bottom;border:none" src="https://drive-thirdparty.googleusercontent.com/16/type/image/png"> <span dir="ltr" style="color:#15c;text-decoration:none;vertical-align:bottom">buffer-point-distance.png</span></a></div><br><div>I create a 50m buffer around a line but when I measure the resulting buffer, its edge is only ~40m from the line (see line-buffer and line-buffer-distance below).</div><div><br><div class="gmail_chip gmail_drive_chip" style="width:396px;height:18px;max-height:18px;background-color:#f5f5f5;padding:5px;color:#222;font-family:arial;font-style:normal;font-weight:bold;font-size:13px;border:1px solid #ddd;line-height:1"><a href="https://drive.google.com/file/d/11cNTRNbHxB3cFCaZEhXDWqKYEdWJX31K/view?usp=drive_web" style="display:inline-block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-decoration:none;padding:1px 0px;border:none;width:100%" target="_blank"><img style="vertical-align:bottom;border:none" src="https://drive-thirdparty.googleusercontent.com/16/type/image/png"> <span dir="ltr" style="color:#15c;text-decoration:none;vertical-align:bottom">line-buffer.png</span></a></div><br></div><div class="gmail_chip gmail_drive_chip" style="width:396px;height:18px;max-height:18px;background-color:#f5f5f5;padding:5px;color:#222;font-family:arial;font-style:normal;font-weight:bold;font-size:13px;border:1px solid #ddd;line-height:1"><a href="https://drive.google.com/file/d/1PGRabSqF-zrOCpAboncQ_yQxx_0ulByN/view?usp=drive_web" style="display:inline-block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-decoration:none;padding:1px 0px;border:none;width:100%" target="_blank"><img style="vertical-align:bottom;border:none" src="https://drive-thirdparty.googleusercontent.com/16/type/image/png"> <span dir="ltr" style="color:#15c;text-decoration:none;vertical-align:bottom">line-buffer-distance.png</span></a></div><br><div><br><div>Clarifications will be much appreciated. Maybe I just missed some part of the documentation.</div><div><br></div><div>Thank you.</div><div><br></div><div>Sincerely,</div><div>Ben Hur</div><div><br></div>-- <br><div dir="ltr" class="m_7597827096661778362m_-2101373580486222619gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><span><div dir="ltr"><div dir="ltr"><div dir="ltr"><font face="monospace, monospace"><div dir="ltr"><div dir="ltr" style="font-size:small"><div style="font-family:Arial,Helvetica,sans-serif">---</div><div style="font-family:Arial,Helvetica,sans-serif"><br></div><div style="font-family:Arial,Helvetica,sans-serif"><b style="font-family:monospace,monospace">Ben Hur S. Pintor</b><br></div><div style="font-family:Arial,Helvetica,sans-serif"><font face="monospace, monospace" size="2"><a href="https://bnhr.xyz/" target="_blank">bnhr.xyz</a></font></div><div style="font-family:Arial,Helvetica,sans-serif"><br></div><div style="font-family:Arial,Helvetica,sans-serif;text-align:center"><img src="https://drive.google.com/uc?id=1EZqMBhBKZDDXaNfzCgFxT_GDhuZSi5c7&export=download"><br></div><div style="font-family:Arial,Helvetica,sans-serif;text-align:center"></div><div style="font-family:Arial,Helvetica,sans-serif;text-align:center"><font face="monospace, monospace" color="#444444">Consultancy · Training & Support</font><span style="font-size:12.8px;color:rgb(68,68,68);font-family:monospace,monospace"> </span><span style="color:rgb(68,68,68);font-family:monospace,monospace">· Development & Innovation</span><span style="color:rgb(68,68,68);font-family:monospace,monospace"> </span></div></div></div></font></div></div></div></span></div></div>
</div></div></div></div></div></div></div></div></div>
_______________________________________________<br>
Qgis-user mailing list<br>
<a href="mailto:Qgis-user@lists.osgeo.org" target="_blank">Qgis-user@lists.osgeo.org</a><br>
List info: <a href="https://lists.osgeo.org/mailman/listinfo/qgis-user" rel="noreferrer" target="_blank">https://lists.osgeo.org/mailman/listinfo/qgis-user</a><br>
Unsubscribe: <a href="https://lists.osgeo.org/mailman/listinfo/qgis-user" rel="noreferrer" target="_blank">https://lists.osgeo.org/mailman/listinfo/qgis-user</a></blockquote></div>