An emprical point error model for TLS derived point clouds

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Küçük Resim

Tarih

2016

Dergi Başlığı

Dergi ISSN

Cilt Başlığı

Yayıncı

International Society for Photogrammetry and Remote Sensing

Erişim Hakkı

info:eu-repo/semantics/openAccess

Araştırma projeleri

Organizasyon Birimleri

Dergi sayısı

Özet

The random error pattern of point clouds has significant effect on the quality of final 3D model. The magnitude and distribution of random errors should be modelled numerically. This work aims at developing such an anisotropic point error model, specifically for the terrestrial laser scanner (TLS) acquired 3D point clouds. A priori precisions of basic TLS observations, which are the range, horizontal angle and vertical angle, are determined by predefined and practical measurement configurations, performed at real-world test environments. A priori precision of horizontal (??) and vertical (??) angles are constant for each point of a data set, and can directly be determined through the repetitive scanning of the same environment. In our practical tests, precisions of the horizontal and vertical angles were found as ??=±36.6 and ??=±17.8, respectively. On the other hand, a priori precision of the range observation (??) is assumed to be a function of range, incidence angle of the incoming laser ray, and reflectivity of object surface. Hence, it is a variable, and computed for each point individually by employing an empirically developed formula varying as ??=±2a'12 mm for a FARO Focus X330 laser scanner. This procedure was followed by the computation of error ellipsoids of each point using the law of variance-covariance propagation. The direction and size of the error ellipsoids were computed by the principal components transformation. The usability and feasibility of the model was investigated in real world scenarios. These investigations validated the suitability and practicality of the proposed method.

Açıklama

Anahtar Kelimeler

Anisotropic, Error ellipsoid, Error model, Incidence angle, Range, Reflectance, Anisotropy, Errors, Laser applications, Random errors, Reflection, Remote sensing, Scanning, Seebeck effect, Thallium, Anisotropic, Error ellipsoids, Surveying instruments

Kaynak

International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences

WoS Q Değeri

N/A

Scopus Q Değeri

N/A

Cilt

41

Sayı

B5

Künye

Özendi, M., Akça, M. D. & Topan, H. (2016). An emprical point error model for TLS derived point clouds. Paper presented at the International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 41(B5), 557-563. doi:10.5194/isprsarchives-XLI-B5-557-2016