Tag Archives: photogrammetry

This gallery contains 13 photos.

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

This gallery contains 8 photos.

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.

This gallery contains 7 photos.

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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Time of day

I’m shooting an earthwork monument for photogrammetry, and its taken months of patient work by the team at OWLP to get all the required consents, so as soon as I got the email from Natural England confirming permission and the … Continue reading

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More dots, more detail: ‘full frame’ KAP

This gallery contains 7 photos.

Some pixel peeping to begin:This is a 100% crop from this frame: and that is simply what I’m on about here, a 25mp 35mm x26mm sensor captures more light than a smaller sensor, no matter how pumped with photosites it … Continue reading

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From KAP to map

This gallery contains 17 photos.

With scale and chain you may obtain The knowledge of your ground. If that you try all points thereby Each figure will be found. Your compass stride on every side Each angle it will shew Do all with care you … Continue reading

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ArchDoc 2013: dawn of the new photogrammetric age

This gallery contains 17 photos.

On returning from ArchDoc 2013 I have come home with the clear impression the camera is by far and away the most powerful and effective tool in the box. Here I summarise the state of the art by looking at some common misunderstandings about technique. Continue reading

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