Tag Archives: photogrammetry

MP2 Swath size

There are probably better ways of getting a handle on how high to fly the Mavic Pro2 but seeing the numbers is how I like to work, the sequence of scales is obvious and the ceiling of 120m AGL is … Continue reading

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Getting to know the Mavic Pro 2

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In preparing the PfCO required operations manual I found not all the requested fields are in the OEM  manual, although the Mavic Pro 2 is a certified type some templates require a technical specification. For the minimum voltage level for … Continue reading

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L1D-20c image quality: 1st thoughts

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This is not definitive, so far I have only used this camera on the default ‘auto’ settings but I want to get a start on this, if nothing else to set a datum for what, hopefully follows. The L1D-20c is … Continue reading

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Plot lines: CAD to PDF

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I have clients who want definitive plots from PDF, they don’t want DWG they actually want paper and, for them, PDF is paper equivalent. I quickly discovered PDF does its own thing when it comes to line weights, and to … Continue reading

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Drawing for… understanding

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New guidance. In providing a client with a specification for historic building survey I had a reminder that Historic England has published new guidance on drawing so I took the time to read it through. It is a guide to … Continue reading

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Photoscale and ground cover

If you need to know what the ground cover for a given camera at a given height will be the photoscale formula will do this for a true nadir shot of a level surface. Photoscale=f/h where f= focal length of … Continue reading

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Kite aerial photogrammetry: 3 developing the contour model.

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Point density. Digitising points off the mesh reveals the structure of the earthwork, the point density is approximately at .2m post spacing increasing to 0.1m at detail areas. A test patch at 0.05m did nothing to improve the model. As … Continue reading

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Kite aerial photogrammetry: 2 the DSM

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1st effort. The surface generated from the Sept 2014 block produced a very irregular model, I had hoped contouring would improve the interpretation of the earthwork but it did not. The contour model was horrible, even after taking out the … Continue reading

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Kite aerial photogrammetry: 1: image capture and cover preview.

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With consents in place low level image capture of the Earith Bulwark in Sept 2014 recorded a surface comprising ragwort, thistle and nettle at full growth, it was not successful as a model when processed: the surface was a lumpy … Continue reading

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3D KAP: textured surface animation

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A quick fly around the model of the Civil War earthwork at Earith; I added an artificial light source to enhance the shallow features. Image quality has taken a tumble to get the animation quickly, The real detail is captured … Continue reading

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