[Qgis-user] Interpolation

[Andrew Harfoot]

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.
>
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-- 
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

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