[Qgis-user] Interpolation

[Alex Mandel]

All the rage at http://2014.FOSS4g.org - Structure From Motion.
Basically using airphotos to build a 3d mesh model of an area with
classic photogrammetry calculations automated. Photos need not be from
directly overhead.

Specifically see the talks by Stephen Mather and Aaron Racicot.

The open source option are not quite 100% there yet (Stephen's talk on
OpenDroneMap) but there is a $170 program PhotoScan that's an option
(See Aaron's talk).

Thanks,
Alex

PS: I use cheap cameras on Kites for sub-centimeter photography.

On 09/18/2014 10:58 AM, Michael.Dodd wrote:
> 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 [ajph at geodata.soton.ac.uk]
> Sent: Thursday, September 18, 2014 2:46 PM
> To: qgis-user at 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.
> 
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> --
> Andy Harfoot
> 
> GeoData Institute
> University of Southampton
> Southampton
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