Digital Airborne Photogrammetry—A New Tool for Quantitative Remote Sensing?—A State-of-the-Art Review On Radiometric Aspects of Digital Photogrammetric Images

Honkavaara, Eija; Arbiol, Román; Markelin, Lauri; Martinez, L.; Cramer, Michael; Bovet, Stéphane; Chandelier, Laure; Ilves, Risto; Klonus, Sascha; Marshal, Paul; Schläpfer, Daniel; Tabor, Mark; Thom, Christian; Veje, Nikolaj

doi:10.3390/rs1030577

Cited by 95 publications

(75 citation statements)

References 29 publications

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“…The raw digital numbers are affected by changes in solar irradiance (exposure settings of the camera were fixed). Therefore, the same ground location may have different digital numbers in sequential images because of different angles of incidence and changes in atmospheric transmittance [24]. The images over the field were analyzed one by one, and not combined into a single image; research by other groups is ongoing on image mosaicing and orthorectification [25,26].…”

Section: Unmanned Aircraft Flightsmentioning

confidence: 99%

Acquisition of NIR-Green-Blue Digital Photographs from Unmanned Aircraft for Crop Monitoring

et al. 2010

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Payload size and weight are critical factors for small Unmanned Aerial Vehicles (UAVs). Digital color-infrared photographs were acquired from a single 12-megapixel camera that did not have an internal hot-mirror filter and had a red-light-blocking filter in front of the lens, resulting in near-infrared (NIR), green and blue images. We tested the UAV-camera system over two variably-fertilized fields of winter wheat and found a good correlation between leaf area index and the green normalized difference vegetation index (GNDVI). The low cost and very-high spatial resolution associated with the camera-UAV system may provide important information for site-specific agriculture.

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Section: Unmanned Aircraft Flightsmentioning

confidence: 99%

Acquisition of NIR-Green-Blue Digital Photographs from Unmanned Aircraft for Crop Monitoring

et al. 2010

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“…Current digital aerial photogrammetric cameras make it possible to capture digital aerial images of extremely high spatial resolution with ground sampling distance (GSD) values of only several centimetres (Sandau 2010). With the application of DPWs, a number of photogrammetric processes, such as the creation of digital terrain models (DTMs) or digital orthophotos, have generally become automated and the manipulation of aerial images has improved (Honkavaara et al 2009, Lemmens 2011.…”

Section: Introductionmentioning

confidence: 99%

Estimation of the mean tree height of forest stands by photogrammetric measurement using digital aerial images of high spatial resolution

et al. 2015

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. Estimation of the mean tree height of forest stands by photogrammetric measurement using digital aerial images of high spatial resolution. Ann. For. Res. 58(1): 125-143.Abstract. Tree height is one of the more fundamental measurements in forest inventories. In addition to classical field measurements, tree height may be estimated by remote sensing methods, such as by photogrammetric measurements of aerial images. Since it has been found and generally accepted that the extraction of forest and tree data from classical analogue aerial photographs has certain limitations, especially in the densely canopied forests, the usefulness of photogrammetric-based forest inventory in many countries remains a controversial issue. Therefore, this paper focuses on investigating the possibility of applying digital photogrammetric method to estimate mean stand height. Photogrammetric stereo-measurements of tree height were conducted on colour infrared images of high spatial resolution (ground sample distance -GSD -of 30 cm and 10 cm) using a digital photogrammetric workstation. The height of each tree within 183 sample plots (14 subcompartments) were calculated as the difference between the tree top elevations determined with the aerial images and the corresponding tree bottom elevations determined from the digital terrain model. To compare the photogrammetric-and field-estimated mean stand heights, the mean plot heights were calculated for both photogrammetric and field estimates of tree heights. Repeated measurements using ANOVA testing did not reveal a statistically significant difference (p > 0.05) between the field-estimated and photogrammetric-estimated mean stand heights using the 30 cm and 10 cm GSD digital aerial images. Deviations of the mean stand heights estimated using the images of both spatial resolutions were similar to the field-estimated heights. Using the 30 cm images the deviations of the photogrammetrically estimated mean stand height amounted to 0.35 m (1.59%) on average, whereas using the 10 cm images the deviations amounted to 0.31 m (1.41%) compared to the field estimation. Therefore, it can be concluded that the 30 cm GSD aerial images allow for the photogrammetric measurement of mean stand heights with accuracy similar to 10 cm GSD aerial images. In addition, 30 cm GSD aerial images are more favourable financially since the same area of interest could be covered with a considerably smaller number of images than of the 10 cm GSD aerial images.

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“…Details of the radiometric postprocessing are dealt with e.g. in (Honkavaara et al, 2009). The other three new cameras have similar features regarding the radiometric quality.…”

Section: Image Qualitymentioning

confidence: 99%

Dem Generation by Means of New Digital Aerial Cameras

Höhle

2013

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

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ABSTRACT:Based on practical experiences with the first generation of digital cameras the impact of four new digital aerial cameras on the DEM generation is estimated. The cameras are evaluated with respect to elevation accuracy, area coverage and image quality. In the derived formulae for the absolute accuracy of elevations a camera factor is applied, which summarizes several features in one number. The produced graphs show the potential of the new cameras regarding the relative and absolute accuracy of automatically derived elevations. For better absolute elevation accuracy the increase of the base/height ratio and of the resolving power of lenses are more important than the reduction of the pixel size. Improvement of the elevation accuracy by means of multi-ray photogrammetry is discussed.

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Digital Airborne Photogrammetry—A New Tool for Quantitative Remote Sensing?—A State-of-the-Art Review On Radiometric Aspects of Digital Photogrammetric Images

Cited by 95 publications

References 29 publications

Acquisition of NIR-Green-Blue Digital Photographs from Unmanned Aircraft for Crop Monitoring

Acquisition of NIR-Green-Blue Digital Photographs from Unmanned Aircraft for Crop Monitoring

Estimation of the mean tree height of forest stands by photogrammetric measurement using digital aerial images of high spatial resolution

Dem Generation by Means of New Digital Aerial Cameras

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