publication . Article . Other literature type . 2016

MERGING DIGITAL SURFACE MODELS IMPLEMENTING BAYESIAN APPROACHES

Haval Abdul-Jabbar Sadeq; Jane Drummond; Zhenhong Li;
Open Access
  • Published: 21 Jun 2016 Journal: The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, volume XLI-B7, pages 711-718 (eissn: 2194-9034, Copyright policy)
  • Publisher: Copernicus GmbH
Abstract
Abstract. In this research different DSMs from different sources have been merged. The merging is based on a probabilistic model using a Bayesian Approach. The implemented data have been sourced from very high resolution satellite imagery sensors (e.g. WorldView-1 and Pleiades). It is deemed preferable to use a Bayesian Approach when the data obtained from the sensors are limited and it is difficult to obtain many measurements or it would be very costly, thus the problem of the lack of data can be solved by introducing a priori estimations of data. To infer the prior data, it is assumed that the roofs of the buildings are specified as smooth, and for that purpose local entropy has been implemented. In addition to the a priori estimations, GNSS RTK measurements have been collected in the field which are used as check points to assess the quality of the DSMs and to validate the merging result. The model has been applied in the West-End of Glasgow containing different kinds of buildings, such as flat roofed and hipped roofed buildings. Both quantitative and qualitative methods have been employed to validate the merged DSM. The validation results have shown that the model was successfully able to improve the quality of the DSMs and improving some characteristics such as the roof surfaces, which consequently led to better representations. In addition to that, the developed model has been compared with the well established Maximum Likelihood model and showed similar quantitative statistical results and better qualitative results. Although the proposed model has been applied on DSMs that were derived from satellite imagery, it can be applied to any other sourced DSMs.
Subjects
free text keywords: Entropy (information theory), Statistical model, Roof, Geography, A priori and a posteriori, Data mining, computer.software_genre, computer, Satellite imagery, GNSS applications, Bayesian probability, Digital surface, lcsh:Technology, lcsh:T, lcsh:Engineering (General). Civil engineering (General), lcsh:TA1-2040, lcsh:Applied optics. Photonics, lcsh:TA1501-1820
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