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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#1F497D">Hi Michael,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#1F497D">You could try
<b>length($geometry) </b>units are generally meters but are usually defined by the CRS.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#1F497D">Here’s another tutorial on Lengths and statistics anong with one on Basic Networking, using POI and Line Network, hopefully it will help along with the revised length formula.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:"Calibri",sans-serif;color:#1F497D"><a href="https://www.qgistutorials.com/en/docs/calculating_line_lengths.html">Basic Length and Statistics</a><o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-family:"Calibri",sans-serif;color:#1F497D"><a href="https://www.qgistutorials.com/en/docs/3/basic_network_analysis.html">Basic Network</a><o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#1F497D">My experience in using Network Analysis is very limited, so I don’t believe I can be of any further help.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#1F497D">Kind Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#1F497D"><br>
Richard<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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<td style="FONT-SIZE: 9pt; FONT-FAMILY: Arial,sans-serif; WIDTH: 500px; COLOR: #004d44; PADDING-BOTTOM: 6px"><span style="FONT-FAMILY: Arial, sans-serif; FONT-WEIGHT: bold; COLOR: #004d44"><br>——</span><br><span style="FONT-FAMILY: Arial, sans-serif; FONT-WEIGHT: bold; COLOR: #004d44">Richard McDonnell MSc GIS, FME Certified Professional</span><br><span style="FONT-FAMILY: Arial, sans-serif; COLOR: #004d44"><i>Flood Risk Management - Data Management</i></span><br><br><span style="FONT-FAMILY: Arial, sans-serif; COLOR: #004d44">——</span><br><span style="FONT-FAMILY: Arial, sans-serif; FONT-WEIGHT: bold; COLOR: #004d44">Oifig na nOibreacha Poiblí</span><br><span style="FONT-FAMILY: Arial, sans-serif; COLOR: #004d44">Office of Public Works</span><br><br><span style="FONT-FAMILY: Arial, sans-serif; FONT-WEIGHT: bold; COLOR: #565148">Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
</span><br><span style="FONT-FAMILY: Arial, sans-serif; COLOR: #565148">Jonathan Swift Street, Trim, Co Meath, C15 NX36</span><br><span style="FONT-FAMILY: Arial, sans-serif; COLOR: #565148">——</span><br><span style="FONT-FAMILY: Arial, sans-serif; COLOR: #565148">M +353 87 688 5964 T +353 46 942 2409</span><br><a href="https://gov.ie/opw">https://gov.ie/opw</a><br><br><span style="FONT-FAMILY: Arial, sans-serif; COLOR: #004d44">——<br>To send me
files larger than 30MB, please use the link below
https://filetransfer.opw.ie/filedrop/richard.mcdonnell@opw.ie<br></span><br><span style="FONT-FAMILY: Arial, sans-serif; COLOR: #004d44">Email Disclaimer:
https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/
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<p class="MsoNormal"><b><span lang="EN-US" style="font-family:"Calibri",sans-serif;mso-ligatures:none;mso-fareast-language:EN-IE">From:</span></b><span lang="EN-US" style="font-family:"Calibri",sans-serif;mso-ligatures:none;mso-fareast-language:EN-IE"> Michael.Dodd
<michael.dodd@open.ac.uk> <br>
<b>Sent:</b> 27 March 2025 11:01<br>
<b>To:</b> Richard McDonnell <richard.mcdonnell@opw.ie><br>
<b>Subject:</b> RE: hub lines<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-GB">Perhaps a bit more complicated than I suggested.<o:p></o:p></span></p>
<ol style="margin-top:0cm" start="1" type="1">
<li class="MsoNormal" style="mso-list:l1 level1 lfo3"><span lang="EN-GB">It is a global map in lat long coordinates so the length values come out as rather strange with $length (negative or positive very large numbers without saying what units)<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l1 level1 lfo3"><span lang="EN-GB">The data I am using to create the hub and spoke are in two files. One has a series of points each with its own identifier and an identifier for the hub to connect to. The second has a
series of hub points with their coordinates, these are the ones that connect to the points in the first file. Items in both files are in random order, each hub connects to some short distances and some very long distances it is not a matter of which hub is
closest to each point, there are often hubs that are much closer to points but they are not connected and this is fine.<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l1 level1 lfo3"><span lang="EN-GB">It is a shame that the hub and spoke analysis does not have the option to produce the line lengths as an extra column automatically as I suspect most people using this function would need
them. It does have options for global maps such as the ones I am using, I have not tried using them yet as the datasets are very large and even without those more complex calculations it took 8h of computing time to get the result and am worried it will take
several times that long. Although it takes so long qgis only uses a relatively small amount of the computer’s resources.<o:p></o:p></span></li></ol>
<p class="MsoListParagraph"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-family:"Calibri",sans-serif;mso-ligatures:none;mso-fareast-language:EN-GB">From:</span></b><span lang="EN-US" style="font-family:"Calibri",sans-serif;mso-ligatures:none;mso-fareast-language:EN-GB"> Richard
McDonnell <<a href="mailto:richard.mcdonnell@opw.ie">richard.mcdonnell@opw.ie</a>>
<br>
<b>Sent:</b> Thursday, March 27, 2025 7:49 AM<br>
<b>To:</b> Richard McDonnell <<a href="mailto:richard.mcdonnell@opw.ie">richard.mcdonnell@opw.ie</a>>; Michael.Dodd <<a href="mailto:michael.dodd@open.ac.uk">michael.dodd@open.ac.uk</a>><br>
<b>Subject:</b> RE: hub lines<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<div style="border:solid black 1.0pt;padding:1.0pt 4.0pt 1.0pt 4.0pt">
<p style="background:#FFFFCC"><span style="font-size:11.0pt;font-family:"Arial",sans-serif;color:black">External email: if the sender or content looks suspicious, please click the Report Message icon, or forward it to report-phishing</span><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#993366">Michael,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#993366">Forgot to add, you can use the Field Calculator to create a new column called length and using “</span><b><span style="font-size:10.0pt;font-family:Consolas;color:#0C0D0E;background:#E3E6E8">$length</span></b><span style="font-family:"Calibri",sans-serif;color:#993366">”,
without quotes, to calculate the length of each line segment<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#993366">From there you can also create further fields, like Average, Max, Min etc., using the
<b>Basic Statistics for fields</b> tool (<b>Vector, Analysis Tools,</b> <b>Basic Statistics for fields</b>)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#993366">Kind Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#993366"><br>
Richard<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#993366"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="line-height:11.25pt"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#004D44;mso-ligatures:none;mso-fareast-language:EN-GB"><br>
——</span></b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#004D44;mso-ligatures:none;mso-fareast-language:EN-GB"><br>
<b>Richard McDonnell MSc GIS, FME Certified Professional</b><br>
<i>Flood Risk Management - Data Management</i><br>
<br>
——<br>
<b>Oifig na nOibreacha Poiblí</b><br>
Office of Public Works<br>
<br>
</span><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#565148;mso-ligatures:none;mso-fareast-language:EN-GB">Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
</span></b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#004D44;mso-ligatures:none;mso-fareast-language:EN-GB"><br>
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#565148;mso-ligatures:none;mso-fareast-language:EN-GB">Jonathan Swift Street, Trim, Co Meath, C15 NX36</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#004D44;mso-ligatures:none;mso-fareast-language:EN-GB"><br>
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#565148;mso-ligatures:none;mso-fareast-language:EN-GB">——</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#004D44;mso-ligatures:none;mso-fareast-language:EN-GB"><br>
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#565148;mso-ligatures:none;mso-fareast-language:EN-GB">M +353 87 688 5964 T +353 46 942 2409</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#004D44;mso-ligatures:none;mso-fareast-language:EN-GB"><br>
<a href="https://gov.ie/opw">https://gov.ie/opw</a><br>
<br>
——<br>
To send me files larger than 30MB, please use the link below <a href="https://filetransfer.opw.ie/filedrop/richard.mcdonnell@opw.ie">
https://filetransfer.opw.ie/filedrop/richard.mcdonnell@opw.ie</a><br>
<br>
Email Disclaimer: <a href="https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/">
https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/</a> <o:p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-family:"Calibri",sans-serif;mso-ligatures:none;mso-fareast-language:EN-IE">From:</span></b><span lang="EN-US" style="font-family:"Calibri",sans-serif;mso-ligatures:none;mso-fareast-language:EN-IE"> QGIS-User
<<a href="mailto:qgis-user-bounces@lists.osgeo.org">qgis-user-bounces@lists.osgeo.org</a>>
<b>On Behalf Of </b>Richard McDonnell via QGIS-User<br>
<b>Sent:</b> 27 March 2025 07:37<br>
<b>To:</b> Michael.Dodd <<a href="mailto:michael.dodd@open.ac.uk">michael.dodd@open.ac.uk</a>><br>
<b>Cc:</b> <a href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a><br>
<b>Subject:</b> Re: [Qgis-user] hub lines<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#1F497D">Hi Michael,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#1F497D">I believe what hat you are looking for is Network analysis. You can have a look
<b><a href="https://docs.qgis.org/3.40/en/docs/training_manual/vector_analysis/network_analysis.html">HERE</a>
</b>which should help. Shortest Path is what you would be looking at.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#1F497D">Kind Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#1F497D"><br>
Richard<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="line-height:11.25pt"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#004D44;mso-ligatures:none;mso-fareast-language:EN-IE"><br>
——</span></b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#004D44;mso-ligatures:none;mso-fareast-language:EN-IE"><br>
<b>Richard McDonnell MSc GIS, FME Certified Professional</b><br>
<i>Flood Risk Management - Data Management</i><br>
<br>
——<br>
<b>Oifig na nOibreacha Poiblí</b><br>
Office of Public Works<br>
<br>
</span><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#565148;mso-ligatures:none;mso-fareast-language:EN-IE">Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
</span></b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#004D44;mso-ligatures:none;mso-fareast-language:EN-IE"><br>
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#565148;mso-ligatures:none;mso-fareast-language:EN-IE">Jonathan Swift Street, Trim, Co Meath, C15 NX36</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#004D44;mso-ligatures:none;mso-fareast-language:EN-IE"><br>
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#565148;mso-ligatures:none;mso-fareast-language:EN-IE">——</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#004D44;mso-ligatures:none;mso-fareast-language:EN-IE"><br>
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#565148;mso-ligatures:none;mso-fareast-language:EN-IE">M +353 87 688 5964 T +353 46 942 2409</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#004D44;mso-ligatures:none;mso-fareast-language:EN-IE"><br>
<a href="https://gov.ie/opw">https://gov.ie/opw</a><br>
<br>
——<br>
To send me files larger than 30MB, please use the link below <a href="https://filetransfer.opw.ie/filedrop/richard.mcdonnell@opw.ie">
https://filetransfer.opw.ie/filedrop/richard.mcdonnell@opw.ie</a><br>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-family:"Calibri",sans-serif;mso-ligatures:none;mso-fareast-language:EN-IE">From:</span></b><span lang="EN-US" style="font-family:"Calibri",sans-serif;mso-ligatures:none;mso-fareast-language:EN-IE"> QGIS-User
<<a href="mailto:qgis-user-bounces@lists.osgeo.org">qgis-user-bounces@lists.osgeo.org</a>>
<b>On Behalf Of </b>Michael.Dodd via QGIS-User<br>
<b>Sent:</b> 26 March 2025 17:54<br>
<b>To:</b> 'qgis-user@lists.osgeo.org' <<a href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a>><br>
<b>Subject:</b> [Qgis-user] hub lines<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">I have produced a map with hub lines using the vector analysis tool but now want to analyse the lines themselves e.g. work out max/min/total distances from a node and not sure how to do this as the attribute table from
the hub layer does not have the line related data. Presumably I have to add it to the table but not sure how to do that in this instance.<o:p></o:p></span></p>
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