Aerial photography flight quality assessment with GPS/INS and DEM data

Zhao, Haitao; Zhang, Bing; Shang, Jiali; Liu, Jiangui; Liu, Dong; Chen, Yanyan; Zuo, Zhengli; Chen, Zhengchao

doi:10.1016/j.isprsjprs.2017.10.015

Cited by 11 publications

(10 citation statements)

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“…Where the photo horizontal attitude is not used as it is exactly vertical photography during planning; X, Y, Z are the ground coordinates; X s , Y s , Z s are the position elements of camera exposure station; x, y are the image coordinates; f is the focal length of the camera; k is the flight direction. Since ground coordinates X and Y are dependent on the actual ground elevation Z, the calculation is implemented by adopting an iterative procedure which can be found in [23].…”

Section: Methodology Of Flight Line Planningmentioning

confidence: 99%

“…If the endlap is too small, gaps can occur and mapping will fail. The endlap of photos is not a single value, but a range of values dependent on the terrain elevation and EO of the photos [23]. The minimum endlap is used as an indicator in flight line planning for it represents the worst overlap in stereo-pair photos.…”

Section: Methodology Of Flight Line Planningmentioning

confidence: 99%

“…Assuming that the origin of image coordinate for each photo is at its center, the minimum forward endlap of photo A with photo B(P x− min− AB ) and backward endlap of photo B with photo A(P x− min− BA ) are derived as Eq. ( 6) [23]:…”

Section: Methodology Of Flight Line Planningmentioning

confidence: 99%

“…Their flight line field workload was compared, and the GSD was analyzed. Their flight line planning overlap results were analyzed which were generated with the flight evaluation system software package method as detailed in [23].…”

Section: Test and Validationmentioning

confidence: 99%

“…During the initial stage, 1 arc-second resolution data covering the USA and 3 arc-second resolution data for the globe were released, with un-filled gaps in high mountainous regions in Version-1 and Version-2. In 2013, the gap filled SRTMGL3 Version-3.0 was released with a 3-arc-second resolution (90m) for the globe [21].The actual accuracy is that 90% absolute height errors are smaller than 9 m validated with ground truth data collected globally [22].The accuracy is precise enough for the flight quality assessment [23], and should be also sufficient for flight planning. About 10 years ago, medium-resolution global DEM can be obtained freely from SRTM Version-2 or ASTER GDEM [24].…”

Section: Introductionmentioning

confidence: 99%

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Adaptable Flight Line Planning for Airborne Photogrammetry Using DEM

Zhao

Zhang

et al. 2021

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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Flight line planning is the first step in an aerial photography campaign. Its two key parameters, ground sampling distance (GSD) and overlap should be designed carefully as they will impact subsequent flying workload and even the final mapping accuracy. For a flat terrain region, flight line planning is easy using a traditional method with fixed baseline ,flight spacing and flight altitude. But for a steep terrain region, photo overlap and GSD will change greatly with topography, thus a flight line planning using the traditional method is not sufficient. This paper presents a novel adaptable flight line planning method for frame camera with four application modes. The flight line planning procedure is implemented through rigorous imaging geometry model using digital elevation data, where actual overlap and GSD can be calculated precisely. Using the desired overlap and GSD as constraint conditions, the flight spacing, baseline and flight altitude can be adjusted adaptively according to ground topography. To assess the effect, a hypothetical test in a rugged terrain region was conducted to compare the project workload, GSD and overlap of the four modes. The results show that Mode 2, Mode 3 and Mode 4 can realize better overlap with lower workload than the traditional method Mode 1. Mode 3 and Mode 4 have better GSD distribution than Mode 1 and Mode 2. The Mode 3 method was also validated in an actual project, showing a favorable performance in final reality 3D model result.

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Section: Methodology Of Flight Line Planningmentioning

confidence: 99%

Section: Methodology Of Flight Line Planningmentioning

confidence: 99%

Section: Methodology Of Flight Line Planningmentioning

confidence: 99%

Section: Test and Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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