Photogrammetric image acquisition and image analysis of oblique imagery

Grenzdörffer, Görres; Guretzki, Markus; Friedlander, Ilan

doi:10.1111/j.1477-9730.2008.00499.x

Cited by 54 publications

(42 citation statements)

References 3 publications

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“…The maximum elevation allowed differs from country to country but it normally does not exceed 300 m. At this elevation a wide angle camera image covers an area of approximately 200 x 300 m. An extension of the ground coverage per image is possible by using an oblique camera. An oblique view covers a larger area, though not at the same scale throughout the image, Grenzdörffer et al, 2008. Oblique-looking images of vegetation surfaces provide an additional advantages of are a lower proportion of the soil …”

Section: Uav and Oblique Imagerymentioning

confidence: 99%

Uav Based BRDF-Measurements of Agricultural Surfaces With Pfiffikus

Grenzdörffer

Niemeyer

2012

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

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Commission I, WG I/V KEY WORDS: UAVs, Photogrammetry, BRDF, camera calibration, four vision camera ABSTRACT:BRDF is a common problem in remote sensing and also in oblique photogrammetry. Common approaches of BRDF-measurement with a field goniometer are costly and rather cumbersome. UAV's may offer an interesting alternative by using a special flight pattern of oblique and converging images. The main part of this paper is the description of a photogrammetric workflow in order to determine the anisotropic reflection properties of a given surface. Due to the relatively low flying heights standard procedures from close range photogrammetry were adopted for outdoor usage. The photogrammetric processing delivered automatic and highly accurate orientation information with the aid of coded targets. The interior orientation of the consumer grade camera is more or less stable. The radiometrically corrected oblique images are converted into ortho photos. The azimuth and elevation angle of every point may then be computed. The calculated anisotropy of a winter wheat plot is shown. A system four diagonally-looking cameras (Four Vision) and an additional nadir looking camera is under development. The multi camera system especially designed for a Micro-UAV with a payload of min 1 kg. The system is composed of five industrial digital frame cameras (1.3 Mpix CCD-chips, 15 fp/s) with fixed lenses. Also special problems with the construction of a light weight housing of the multi camera solution are covered in the paper.

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Section: Uav and Oblique Imagerymentioning

confidence: 99%

Uav Based BRDF-Measurements of Agricultural Surfaces With Pfiffikus

Grenzdörffer

Niemeyer

2012

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

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“…This system found a variety of applications including urban planing, 3D modeling, and emergency response (Karbo and Schroth, 2009). The system PFIFF (Grenzdörffer et al, 2008) is also based on an oblique looking camera, which is integrated with a GPS receiver. Oblique view geometry require special treatment for flight planning (Grenzdörffer et al, 2008) or measurements (Höhle, 2008).…”

Section: Related Workmentioning

confidence: 99%

“…The system PFIFF (Grenzdörffer et al, 2008) is also based on an oblique looking camera, which is integrated with a GPS receiver. Oblique view geometry require special treatment for flight planning (Grenzdörffer et al, 2008) or measurements (Höhle, 2008). Texture mapping is also possible using a push-broom instrument.…”

Section: Related Workmentioning

confidence: 99%

See 1 more Smart Citation

Quality Assessment of Building Textures Extracted From Oblique Airborne Thermal Imagery

Iwaszczuk¹,

Stilla²

2016

ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Thermal properties of the building hull became an important topic of the last decade. Combining the thermal data with building models makes it possible to analyze thermal data in a 3D scene. In this paper we combine thermal images with 3D building models by texture mapping. We present a method for texture extraction from oblique airborne thermal infrared images. We put emphasis on quality assessment of these textures and evaluation of their usability for thermal inspections. The quality measures used for assessment are divided to resolution, occlusion and matching quality.

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“…In the instrumental field of surveying and mapping, oblique photogrammetry is a fast evolving techniques for geographical environment monitoring and land information capture (5,6). The aerial solution subverts the limitations of previous orthophoto techniques that only shot from a perpendicular angle using multiple sensors on one flight platform.…”

Section: Introductionmentioning

confidence: 99%

Calibration of digital camera integration accuracy for low-cost oblique aerial photogrammetry

Liu

Shao

2015

Geo-spatial Information Science

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This work describes a calibration process for inexpensive consumer cameras integrated into a low cost and compact aerial multi-view imager for remote sensing and photogrammetry. The main advantage of this design is to make the filming component lightweight and rapidly deployable, as well as reducing cost when compared with mainstream commercial oblique imagery. An in situ flight test was carried out in Guiyang. In that experiment, a meridian convergence-based approach was adopted to adjust preprocessing, the residue error and the captured images' exterior orientation linear and angular parameters were calculated by means of the direct geo-referencing approach yielding a favorable outcome for exterior orientation linear parameters of the camera, around 0.2-0.3 m deviation from the actual measured results at 1000 m flight above ground level. The camera's exterior orientation angular parameters φ, ω whose difference compared with the standard aerial aero triangulation approach reached a high accuracy level within the intended endurance of 0.005°. These results indicate that the compact implementation of the oblique aerial imager comprised of consumer level off-the-shelf digital cameras achieved competitive accuracy at a low cost and high versatility.

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Photogrammetric image acquisition and image analysis of oblique imagery

Cited by 54 publications

References 3 publications

Uav Based BRDF-Measurements of Agricultural Surfaces With Pfiffikus

Uav Based BRDF-Measurements of Agricultural Surfaces With Pfiffikus

Quality Assessment of Building Textures Extracted From Oblique Airborne Thermal Imagery

Calibration of digital camera integration accuracy for low-cost oblique aerial photogrammetry

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