Korpela, I. 2004. Individual tree measurements by means of digital aerial photogrammetry. Silva Fennica Monographs 3. 93 p. This study explores the plausibility of the use of multi-scale, CIR aerial photographs to conduct forest inventory at the individual tree level. Multiple digitised aerial photographs are used for manual and semi-automatic 3D positioning of tree tops, for species classifica...

Digital imaging is a rapid growing area with the developments in computer technology. Digital color use has become a conventional tool in many disciplines, such as cartography remote sensing and photogrammetry. The need for better color quality enforces digital imaging industry to produce devices with less color distortions. Despite the today’s advanced level of technology, it is known that inp...

The use of new materials in knee arthroplasty demands a way in which to accurately quantify wear in retrieved components. Methods such as damage scoring, coordinate measurement, and in vivo wear analysis have been used in the past. The limitations in these methods illustrate a need for a different methodology that can accurately quantify wear, which is relatively easy to perform and uses a mini...

For many applications in machine vision, digital photogrammetry and scientific research image sequences of rapidly moving objects have to be acquired with high temporal resolution. If the standard video rate (30 frames/sec NTSC resp. 25 frames/sec CCIR) is not sufficient, high-speed solid state cameras may be considered offering frame rates of up to 15,000 frames per second. As the processing o...

Many of the processes involved in soil erosion have dimensions on the millimetre scale. Modelling and quantification of such processes require information on soil surface topography with adequate resolution. The purpose of this study was to generate digital elevation models (DEMs) from soil surfaces with high spatial and temporal resolution. Digital photogrammetry was applied for measuring eros...

Photogrammetry is becoming a highly efficient alternative technique to laser-scanning for creating virtual outcrop models. It is easy to create a 3-dimensional digital model of an outcrop and extract geological information contained in it by using photos taken from different locations and integrating few free and/or cheap software. Subsequently, both the virtual outcrop and the geological data ...

We propose to use small format aerial images (SFAI), considered as not controlled, and stereo-photogrammetry techniques for constructing georeferenced mosaics. The images are obtained using a digital camera coupled to a small, radio controlled helicopter. Techniques for removing distortions are applied and the relative orientation of the models are computed using perspective geometry. Ground tr...

This paper focuses on general remarks on the test of the German Society of Photogrammetry, Remote Sensing and Geoinformation (DGPF) on Digital Airborne Camera Evaluation. It should be seen as an introductory paper which explains the test bed itself, the available reference and test data sets and the overall organization and structure of the data evaluation. The more detailed results are publish...

This paper presents a general overview of notable developments in close-range photogrammetry (CRP) over the past four decades, during which time both automated processes were introduced and the full transition from film-based to digital imaging cameras occurred. With these developments and more recent innovations centred upon so-called structure-frommotion approaches to network orientation, alo...