Within the paper a comparative quantification of the spatial image resolution for large-format digital airborne cameras will be presented. For this purpose, imagery of the Leica ADS40, the Intergraph Z/I-imaging DMC and the Vexcel UltraCamD were examined. The respective spatial resolutions are represented by means of the point spread function, which can be measured easily and reliably at image ...

In the years of 2004 to 2006, the Portuguese authority for forestry, the Direcção Geral dos Recursos Florestais (DGRF) ordered a digital photo flight over the whole country. The images, acquired with a Vexcel UltraCamD digital camera, have a GSD of about 50 cm and GPS/IMU data from an IGI AeroControl IId system were also available for most of the flown strips. Although the first objective of th...

Car detection from aerial images has been studied for years. However, given a large-scale aerial image with typical car and background appearance variations, robust and efficient car detection is still a challenging problem. In this paper, we present a novel and robust framework for automatic car detection from aerial images. The main contribution is a new on-line boosting algorithm for efficie...

This paper gives an overview on the EuroSDR project on Digital Camera Calibration and Validation and summarizes its main results. This project emphasises on the calibration and validation of digital airborne cameras, where mainly the geometric aspects were of concern. The project was officially finished in May 2007, after almost 3,5 years of project duration. Although the whole project was dela...

Remote sensing plays a critical role in mapping and monitoring mangroves. Aerial photographs and visual image interpretation techniques have historically been known to be the most common approach for mapping mangroves and species discrimination. However, with the availability of increased spectral resolution satellite imagery, and advances in digital image classification algorithms, there is no...

The nominal resolution of digital aerial images does not always correspond to the effective resolution. This can be tested by edge analysis, but the resolution is just one figure about the image quality. A more detailed information is included in the modulation transfer function (MTF), showing also the image quality for lower image frequency. The MTF is quite dependent upon the used aperture. I...

This study is a contribution to assess the high resolution digital aerial imagery for semi-automatic analysis of tree species identification. To maximize the benefit of such data, the object-based classification was conducted in a mixed forest plantation. Two subsets of an UltraCam D image were geometrically corrected using aero-triangulation method. Some appropriate transformations were perfor...

Digital cameras are replacing analog film not only on the consumer market. New digital aerial cameras such as Vexcel Imaging UltraCamD or Z/I DMC implement novel concepts that make the changeover to digital photogrammetry possible. The comparison of image quality of these sensors is important when switching from analog to digital. In this paper we propose algorithms of how to assess image quali...