All Articles

77 articles listed in reverse chronological order. View articles by field type using links on the right.



PHOTO-BASED 3D SCANNING VS. LASER SCANNING COMPETITIVE DATA ACQUISITION METHODS FOR DIGITAL TERRAIN MODELLING OF STEEP MOUNTAIN SLOPES
06/14/2011 | N. Kolecka, Department of GIS, Cartography and Remote Sensing, Jagiellonian University, Krakow, Poland
ISPRS Hannover Workshop 2011: High-Resolution Earth Imaging for Geospatial Information
Applications: All and Geology & Mining

The paper presents how terrestrial laser scanning (TLS) and terrestrial digital photogrammetry were used to create a 3D model of a steep mountain wall. Terrestrial methods of data acquisition are the most suitable for such relief, as the most effective registration is perpendicular to the surface. First, various aspects of photo-based scanning and laser scanning were discussed.

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Precise positioning surveillance in 3-D using night-vision stereoscopic photogrammetry
04/26/2011 | Jason M. Schwartz
Display Technologies and Applications for Defense, Security, and Avionics - V. (S.P.I.E.) 8042
Applications: All and Engineering & Science

A 3-D imaging technique is presented which pairs high-resolution night-vision cameras with GPS to increase the capabilities of passive imaging surveillance. Camera models and GPS are used to derive a registered point cloud from multiple night-vision images. These point clouds are used to generate 3-D scene models and extract real-world positions of mission critical objects. Analysis shows accuracies rivaling laser scanning even in near-total darkness. The technique has been tested on stereoscopic 3-D video collections as well. Because this technique does not rely on active laser emissions it is more portable, less complex, less costly, and less detectable than laser scanning. This study investigates close-range photogrammetry under night-vision lighting conditions using practical use-case examples of terrain modeling, covert facility surveillance, and stand-off facial recognition.

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Using Close Range Photogrammetry to Measure the Position of Inaccessible Geological Features
02/01/2011 | Assoc Prof. Dr. Murat Yakar, University of Selcuk, Turkey
Journal of Experimental Techniques
Applications: All and Geology & Mining

Investigations of major geological formations are very important since they provide vital information in terms of monitoring of feature changes. This article describes the way in which close range photogrammetry can be used to obtain quantitative information on the geometry and strain patterns in an evolving physical model.

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MONITORING THE TESTING, CONSTRUCTION AND AS-BUILT CONDITION OF MEMBRANE STRUCTURES BY CLOSE RANGE PHOTOGRAMMETRY
06/21/2010 | Chih-Heng Wang, Jon P. Mills, Peter D. Gosling, Ben Bridgens, Robert J Grisdale; School of Civil Engineering and Geosciences, Newcastle University
International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol. XXXVIII, Part 5
Applications: Accuracy, All, Engineering & Science, and Industrial Measurement

Engineering deformation monitoring requires techniques which can produce high precision and accuracy, reliable measurements at good temporal resolution and fast processing speed. Moreover, monitoring in civil engineering is generally considered to be labour-intensive and financially expensive, and it can take significant effort to arrange the necessary human resources, transportation and equipment maintenance. Such requirements are especially true for monitoring non-rigid membrane structures (defined in this paper as covers or enclosures in which a fabric surface is pre-shaped and pre-tensioned to provide a shape that is stable under environmental loads). Low cost, automated, photogrammetric techniques therefore have the potential to become routinely viable for the structural monitoring of non-rigid membrane structures in the future. This research is investigating the use of close range photogrammetry to be applied at all stages of membrane structure engineering, from materials testing, through dimensional control in construction to in-situ, as-built monitoring of the finished construct.

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VERY CLOSE NADIRAL IMAGES: A PROPOSAL FOR QUICK DIGGING SURVEY
06/21/2010 | F. Chiabrando, E. Costamagna, F. Rinaudo, A. Spano - Politechnico di Torino
International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol. XXXVIII, Part 5, Commission V Symposium, Newcastle upon Tyne, UK. 2010
Applications: All, Archaeology, Geology & Mining, and Surveying

The main goal of our activity has been the testing of a system for quick and non invasive images acquisition and their suitable processings aimed to obtain 2D & 3D models for archaeological diggings documentation. This purpose has implied the analysis and the selection of a simple and efficient data processing system for the generation of metric products such as digital elevation models and orthophotos, featured by an high level of detail regarding the excavated areas.

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Land-based Marginal Ice Cliffs: Focus on Kilimanjaro
05/01/2010 | M. Winkler, G. Kaser, N. Cullen, T. Molg, D. Hardy, W.T. Pfeffer
Applications: All, Engineering & Science, and Geology & Mining

Land-based ice cliffs are intriguing features at the margins of glaciers around the world but little is known about mechanisms of their formation and maintenance. The focus of article is on the persistent, rarely-calving ice cliffs on the Kibo glacier, the main peak of Kilimanjaro. Oct 2009 photos were taken covering the sample cliff. PhotoModeler Scanner’s automatic stereo matching lead to a reference digital surface model.

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The Accuracy of Photogrammetry vs. Hands-on Measurement Techniques used in Accident Reconstruction
04/12/2010 | Bryan Randles, Biomechanical Research & Testing; Brian Jones, Elliott & Jones LLC; Judson Welcher and Thomas Szabo, Biomechanical Research & Testing; David Elliott, Elliott & Jones LLC; and Cameron MacAdams, Elliott & Jones, LLC
SAE 2010-01-0065
Applications: All and Forensics & Accident Recon.

A study was conducted to assess the relative accuracy of two measurement techniques commonly used for vehicle measurements in damaged-based accident reconstruction. The traditional technique of hands-on measurement was compared with the use of photogrammetry for measurement of targeted damaged vehicles. Three undamaged vehicles were subjected to 4 impacts, resulting in 4 damaged areas (two front, one side and one rear).

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Photogrammetric Measurement of Recession Rates of Low Temperature Ablators in Supersonic Flow
01/04/2010 | David Callaway, Mark Reeder, Robert Greendyke : U.S. Air Force Institute of Technology; Ryan Gosse, U.S. Air Force Research Laboratory
48th AIAA Aerospace Sciences Meeting Proceedings
Applications: All, Engineering & Science, and Industrial Measurement

Ablative heat shields have been used to protect hypersonic vehicles during atmospheric re-entry during the Apollo missions and could be used for future flight vehicles as well. However, it is exceptionally difficult to perform reliable tests at conditions which are representative of flight to validate the models. In this study, the AFIT Mach 3 pressure-vacuum wind tunnel was used in combination with models consisting of dry ice. Measurement was obtained with projected laser dots, high-speed multi-camera photography and PhotoModeler PMV (pre-cursor to PhotoModeler Motion).

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Laser Scanning Versus Photogrammetry Combined with Manual Post-modeling in Stecak Digitization
2010 | Goran Radosevic, Supervisor: Selma Rizvic, Faculty of Electrical Engineering Sarajevo
PROCEEDINGS OF CESCG 2010
Applications: All and Archaeology

The authors compare digitization results and procedures for one of the most famous stecci (gravestone) – The Stecak from Donja Zgosca. The object was first digitized using a Minolta 910 laser scanner, and then created the 3D model from photos using photogrammetry and improved in 3ds max. They present advantages and drawbacks of these two procedures and characteristics of the obtained models.

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Recent Developments in Close Range Photogrammetry (CRP) for Mining and Reclamation
2010 | Maynard L. (Mike) Dunn, Jr., Geologist, Office of Surface Mining and Reclamation Pittsburgh, PA
Applications: All and Geology & Mining

This report presents the potential of close range photogrammetry for mining and reclamation. The mining reclamation community depends on accurate mapping for almost all activities. Traditional ground surveys are adequate for small, uncomplicated jobs but at some point, the size and or complexity of a project makes it more economical to have a site flown (mapped using aerial photogrammetry). Because of cost, most projects are only flown at the start and less often when completed. Close Range Photogrammetry (CRP) offers much potential for measuring features that cant or aren’t being measured otherwise.

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