High Precision Industrial Photogrammetry

Wester-Ebbinghaus, W.

doi:10.1111/j.1477-9730.1990.tb00720.x

Cited by 6 publications

(4 citation statements)

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“…Several patches have to be combined and adjusted both geometrically and radiometrically to form an equivalent single image. This approach is conceptually identical to solutions adopted by reseau‐scanning cameras (Luhmann and Wester‐Ebbinghaus, 1987; Wester‐Ebbinghaus, 1990), analytical stereoplotters (Ackermann, 1984) and digital comparators (Newby, 1990). Digitised partial images are assembled numerically by means of reseau crosses with known coordinates.…”

Section: Calibration Of Tk‐350 Framesmentioning

confidence: 98%

Accuracy analysis, dem generation and validation using russian tk‐350 stereo‐images

Büyüksali̇h

Kocak

Oruç

et al. 2004

The Photogrammetric Record

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TK-350 stereo-scenes of the Zonguldak testfield in the north-west of Turkey have been analysed. The imagery had a base-to-height ratio of 0AE52 and covered an area of 200 km · 300 km, with each pixel representing 10 m on the ground. Control points digitised from 1:25 000 scale topographic maps were used in the test. A bundle orientation was executed using the University of Hanover program BLUH and PCI Geomatica OrthoEngine AE software packages. Tests revealed that TK-350 stereo-images can yield 3D geopositioning to an accuracy of about 10 m in planimetry and 17 m in height. A 40 m resolution digital elevation model (DEM) was generated by the PCI system and compared against a reference DEM, which was derived from digitised contour lines provided by 1:25 000 scale topographic maps. This comparison showed that accuracy depends mainly on the surface structure and the slope of the local terrain. Root mean square errors in height were found to be about 27 and 39 m outside and inside forested areas, respectively. The matched DEM demonstrated a systematic shift against the reference DEM visible as an asymmetric shift in the frequency distribution. This is perhaps caused by the presence of vegetation and buildings.

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Section: Calibration Of Tk‐350 Framesmentioning

confidence: 98%

Accuracy analysis, dem generation and validation using russian tk‐350 stereo‐images

Büyüksali̇h

Kocak

Oruç

et al. 2004

The Photogrammetric Record

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“…Among the pioneers in digital photogrammetry was Prof. Wilfried Wester-Ebbinghaus. He developed digital solutions necessary for image measurement and camera calibration, bridging large scale photography with digital scanning and reseau technology to form high end photogrammetry solutions for industrial applications [Wester-Ebbinghaus 1990].…”

Section: Introductionmentioning

confidence: 99%

Industrial Photogrammetry - Accepted Metrology Tool or Exotic Niche

Bösemann¹

2016

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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New production technologies like 3D printing and other adaptive manufacturing technologies have changed the industrial manufacturing process, often referred to as next industrial revolution or short industry 4.0. Such Cyber Physical Production Systems combine virtual and real world through digitization, model building process simulation and optimization. It is commonly understood that measurement technologies are the key to combine the real and virtual worlds (eg. [Schmitt 2014]).This change from measurement as a quality control tool to a fully integrated step in the production process has also changed the requirements for 3D metrology solutions. Key words like MAA (Measurement Assisted Assembly) illustrate that new position of metrology in the industrial production process.At the same time it is obvious that these processes not only require more measurements but also systems to deliver the required information in high density in a short time. Here optical solutions including photogrammetry for 3D measurements have big advantages over traditional mechanical CMM's.The paper describes the relevance of different photogrammetric solutions including state of the art, industry requirements and application examples.

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“…Then the camera positions can also be named with very good approximate positions [11]. Following these work steps, every optically identify-able point visible in 3 pictures of the multiple image composition can be measured with three dimensional accuracy [10], [11]. The software tested in this study is able to automatically generate surface models from multiple imagery and can measure the position of points equivalently to a stereo-photogrammetry system.…”

Section: Methodsmentioning

confidence: 99%

“…With the knowledge of the position of some (at least 3) points on the target surface the systems-orientation is done, this produces the scale and the level, as well as the geographical coordinates to every measurement. Then the camera positions can also be named with very good approximate positions [11]. Following these work steps, every optically identify-able point visible in 3 pictures of the multiple image composition can be measured with three dimensional accuracy [10], [11].…”

Section: Methodsmentioning

confidence: 99%

Digital multi-image photogrammetry combined with oblique aerial photography enables glacier monitoring survey flights below clouds in Alaska

Gleitsmann¹,

Kappas²

IEEE International IEEE International IEEE International Geoscience and Remote Sensing Symposium, 2004. IGARSS '04. Proceedings

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Usually "bad weather" for aerial surveys in mountain terrain means something like normal weather. Only exceptionally good weather conditions can be used successfull for vertical aerial photography. In the coastal mountains of Alaska this kind of weather is rare enough to seriously hamper survey activities. Recognizing this problem, a method for survey flights that can deal with far less than ideal weather conditions was developed and is now being tested in a joint venture with the USGS Glaciology section in Fairbanks, Alaska. Our current study is focused on evaluating a new, self contained approach to study high mountain geomorphology using a close range remote sensing method with a low flying light aircraft as a basis for digital oblique aerial photogrammetry.With a special type of camera and digital multi-image photogrammetry system its now possible to extract DEM (Digital Elevation Models) from oblique aerial photography, acquired out of the open window of almost any light aircraft. With this method the aircraft is not bound to a straight flight path and can move freely around and over the target area. This allows it to fly very close to a specific target and get a very high accuracy, depending on target size and distance to it. Even more important, any weather good enough for normal photography and "mountain flying" can be used to get data. There are few restrictions on the weather unlike in the case of the usual vertical aerial photography, which requires clear skies, no clouds, and is hampered by strong thermal activity in the air. Especially in a oceanic high mountain weather environment this is a significant advantage, since weather delays are significantly reduced. Depending on target area location, it here is normal to fly low under the clouds within the mountain valleys and approach the photo destination. With this method one flys around the target and takes the measurement pictures from all sides of it, under the clouds. If weather conditions allow, vertical pictures can also be used and built into the system. Usually the accuracy is as good as with vertical aerial standard cameras and operator measured photogrammetry systems.With digital multi-image photogrammetry automated surface measurements are now possible and produce good results. The mating of the camera with a DGPS and a INS unit will create approximate camera positions, that could lead to establishing this method as a survey without the necessity of ground control (GCP's) in the near future.

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High Precision Industrial Photogrammetry

Cited by 6 publications

References 0 publications

Accuracy analysis, dem generation and validation using russian tk‐350 stereo‐images

Accuracy analysis, dem generation and validation using russian tk‐350 stereo‐images

Industrial Photogrammetry - Accepted Metrology Tool or Exotic Niche

Digital multi-image photogrammetry combined with oblique aerial photography enables glacier monitoring survey flights below clouds in Alaska

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