As a Chartered Land Surveyor my career has been involved with measurement using a variety of techniques and adopting new techniques as technology evolved and measurement using photographs (photogrammetry) has always been of particular interest. Photographs are a permanent record of the subject being measured which can be referred to again and again so measurements can be taken without site revisits. These pages contain information on some methods of measurement from photographs including Photographic Intersection and measurements from 360° Panoramas.
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Use 360° Panoramas for ‘Real Life’ Measurement |
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PaMe – Measure from 360° Panoramas |
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Photographic Intersection |
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Accuracy for Intersection Solutions |
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Single Lens v Multi-lens Cameras for Accuracy Today there is a plethora of multi-lens cameras for capturing 360° panoramas which have the advantage of a single shot rather than taking a set of shots, but would these have the accuracy required for measurement as there are two fundamental differences between the two methods. To make panoramas with a camera with a single lens it is usually mounted on a panohead and rotated about the NPP but with a multi-lens camera this is physically impossible. |
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Samsung Gear 360 + Insta360 ONE X The result of the investigating the accuracy of using a Samsung Gear 360 for measurement, where the Samsung Gear 360 was rotated around its central vertical axis and stitched with PTGui, which provided a more accurate result than combing the hemispheres with ActionDirector, raised the question “Would a better result be achieved if the Samsung Gear 360 was rotated about the NNP of the lenses?” |
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Finding the Nodal Point of a Lens |
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Determination of the No Parallax Point of a Lens Using a Cross Line Laser |
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Mapped No Parallax Points Results from determining the location of the No Parallax Point (NPP) of a selection of lenses. |
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The No Parallax Point |
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The Nodal Point |