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Sökning: L773:1948 660X

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1.
  • Jouybari, Arash, et al. (författare)
  • Comparison of the strip- and block-wise aerial triangulation using different exterior orientation parameters weights
  • 2021
  • Ingår i: Journal of Spatial Information Science. - : Informa UK Limited. - 1948-660X .- 1449-8596 .- 1836-5655. ; , s. 1-18
  • Tidskriftsartikel (refereegranskat)abstract
    • In this study, three different procedures: checkpoint RMS of residuals, statistical evaluation of AT results using t-test, and comparison of a photogrammetric digital surface model (DSM) and LiDAR data are used to analyse the effect of IMU and GNSS uncertainties on the final adjusted results. The outcome suggests that the method of block-wise GNSS shift correction is the better method for aerial triangulation and one should use appropriate observable weights in AT. The comparison of checkpoint RMS residuals between the two methods shows that the block-wise solution is on average 6cm more accurate than the strip-wise solution. 
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2.
  • Toomanian, Ara, et al. (författare)
  • Automatic integration of spatial data in viewing services
  • 2013
  • Ingår i: Journal of Spatial Information Science. - 1948-660X. ; 6:2013, s. 43-58
  • Tidskriftsartikel (refereegranskat)abstract
    • Geoportals are increasingly used for searching, viewing, and downloading spatial data. This study concerns methods to improve the visual presentation in viewing services. When spatial data in a viewing service are taken from more than one source there are often syntactic, semantic, topological, and geometrical conflicts that prevent maps being fully consistent. In this study we extend a standard view service with methods to solve these conflicts. The methods are based on: (1) semantic labels of data in basic services, (2) a rule-base in the portal layer, and (3) integration methods in the portal layer. To evaluate the methodology, we use a case study for adding historical borders on top of a base-map. The results show that the borders are overlaid on top of the map without conflicts, and that a consistent map is generated automatically as an output. The methodology can be generalized to add other types of data on top of a base-map.
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