Kern DKM2-A and Leica DISTO

The following examples were originally used to evaluate the accuracy of using equirectangular images as a ‘photographic theodolite’ but provided useful data for trying out PaMe.

Circular TargetThe ‘points’ were circular targets which were measured relative to the 360° Panorama locations using a Kern DKM2-A 1″ Theodolite and Leica DISTO.
The target was developed in the early 1980s for close range photogrammetry to be easily intersected by both ‘theodolite cross hairs’ and the ‘floating mark’ in a stereo plotter, irrespective of distance and angle to the line of sight (within reason). The colour was chosen so that the ‘theodolite cross hairs’ are clearly visible against the target which appears as black and white with the monochrome film used helping with identification in the image.
To ensure stability ‘survey tripods’ were used and to ensure the 360° Panoramas were concentric with the theodolite Leica (Wild) tribrachs provided ‘forced centering’.

The images were captured with a DX DSLR + 8 mm Fisheye lens yielding 12,000 x 6,000 equirectangulars. For Setup One and Setup Two measurements were also taken from equirectangulars resized to 6,000 x 3,000 to simulate the images produced by single shot duel lens cameras, but I hope to be able to create a Setup using such cameras in the future.
The results show no significant difference between using the 72 Mp (12,000 x 6,000) equirectangular images and the 18 Mp (6,000 x 3,000) equirectangular images although working with the higher definition image it was easier to identify and intersect the points being measured between..

360° Panoramas - Measurement Examples - Setup One   Setup One
Photography – June 2016
Nikon FX DSLR + Samyang 8 mm Fisheye Lens
16 Points co-ordinated with the Kern 1″ Theodolite and Leica DISTO on two vertical surfaces parallel to the ‘base line’ between the two 360° Panoramas.
Protocol – “Known distance between pano’s” and “Known length”.
360° Panoramas - Measurement Examples - Setup Two   Setup Two
Photography – October 2016
Nikon FX DSLR + Samyang 8 mm Fisheye Lens
Five Points co-ordinated with the Kern 1″ Theodolite and Leica DISTO plus two Directly Measured Lines.
Protocol – “Known distance between pano’s” and “Known length”.
360° Panoramas - Measurement Examples - Setup Three   Setup Three
Photography – 4th September 2017
Nikon FX DSLR + Samyang 8 mm Fisheye Lens
12 Points co-ordinated with the Kern 1″ Theodolite and Leica DISTO on two vertical surfaces parallel to the ‘base line’ between the two 360° Panoramas.
Protocol – “Known distance between pano’s” and “Known length”.

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