Yes had thought about this and nearly got Leica to test out their latest laser scanner a couple of years ago but land owner was frightened it might cause some kind of damage to the area so it never happened.
________________________________ From: Andrew Harfoot [a...@geodata.soton.ac.uk] Sent: Thursday, September 18, 2014 2:46 PM To: qgis-user@lists.osgeo.org Subject: Re: [Qgis-user] Interpolation Hi Michael, Off the top of my head, but have you looked into a laser scanner mounted on some sort of aerial platform such as a cherry picker? Not sure whether the platform would be stable enough. Alternatively a low level UAV flight may provide a detailed enough DTM through stereo imagery analysis. Cheers, Andy On 18/09/2014 10:43, Michael.Dodd wrote: Any suggestions as to the best way to survey and interpolate ridge and furrow grassland that is not on a flat plane? I have tried various methods without success. The ridge and furrow area that I want to map is about 120mx120m, the ridge and furrow pattern is distinct with about 0.5m or difference between ridge ht and furrow base but the pattern has a slight curve towards one end and the land is not flat. If you are not sure what ridge and furrow looks like then there is an example at 51.9827, -0.9135, the stripes are clearly visible on the google earth image. Mapping can be done with cm level dgps but does this require many tens of thousands of points to be recorded. Or can fewer points be recorded and qgis interpolation somehow be told to interpolate along the ridge and furrow then fill in the area between them with some sort of curve. The actual curve is also problematic as the ridge top tends to be flattened and not a smooth sine wave. I don't have good LIDAR of the area but even that resolution may not be good enough. -- The Open University is incorporated by Royal Charter (RC 000391), an exempt charity in England & Wales and a charity registered in Scotland (SC 038302). The Open University is authorised and regulated by the Financial Conduct Authority. _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org<mailto:Qgis-user@lists.osgeo.org> http://lists.osgeo.org/mailman/listinfo/qgis-user -- Andy Harfoot GeoData Institute University of Southampton Southampton SO17 1BJ Tel: +44 (0)23 8059 2719 Fax: +44 (0)23 8059 2849 www.geodata.soton.ac.uk<http://www.geodata.soton.ac.uk>
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