As your data is in PostGIS and assuming that they are arcs (curved lines part of a circle) you could use some geometry and spatial SQL functions to calculate the radius of any curve knowing the coordinates of the end points of the curve.
To quote the pseudo code on the linked page: “To calculate the radius of an arc, take the height -- "H" -- of the arc and divide it by two. Call the result "C." Now take the width -- "W" -- of the arc and square it by multiplying it by itself. Call the result "D." Next multiply height, "H," by eight and call this result "E." Divide "D" by "E" and call the result "F." The radius of the arc is C plus F.” https://sciencing.com/calculate-radius-curve-7804090.html Could probably be wrapped in a function and run against any curve. Ross From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Cory Albrecht Sent: 19 April 2019 17:08 To: qgis-user@lists.osgeo.org Subject: Re: [Qgis-user] finding the radius of a curve I'll give it a try. Thanks! On Sun, Apr 14, 2019 at 7:52 AM Mike Flannigan <mikef...@att.net<mailto:mikef...@att.net>> wrote: Draw a circle and measure the diameter/radius. Maybe use this plugin to create a circle: https://plugins.qgis.org/plugins/CADDigitize/ Mike On 4/13/2019 2:00 PM, qgis-user-requ...@lists.osgeo.org<mailto:qgis-user-requ...@lists.osgeo.org> wrote: > Hello all, > > I'm looking for a way to find the radius of a curve (for roads, railyways) > in QGIS. If it were a paper map I could do it with a drafting compass > (calipers to some) and a ruler, but this is a PostGIS layer. > > Any plugin recommendations or links to a set of steps to accomplish this? > Thanks in advance! This message is strictly confidential. If you have received this in error, please inform the sender and remove it from your system. If received in error you may not copy, print, forward or use it or any attachment in any way. This message is not capable of creating a legal contract or a binding representation and does not represent the views of Angus Council. Emails may be monitored for security and network management reasons. Messages containing inappropriate content may be intercepted. Angus Council does not accept any liability for any harm that may be caused to the recipient system or data on it by this message or any attachment.
_______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
