Comparison of Distance Discrepancies in Georeferenced and Non-Georeferenced Terrestrial LiDAR Models

9 pages•Published: June 9, 2021

Gustavo Maldonado, Marcel Maghiar and Ananya Augustine

Abstract

The objective of this study is twofold: (a) To investigate the magnitude of errors introduced by a typical georeferencing procedure when it is applied to a relatively large (five acres), non- georeferenced, but still accurate point-cloud model. The modeled area is a commercial site, and its model was generated via static terrestrial LiDAR. (b) To complete practical, hands-on service- learning activities that benefit not only members of the local community, but also graduate and undergraduate students whose learning is enhanced through experiential practical opportunities offered by our engineering and construction programs. The resulting 3D virtual models were donated to the property owners and serve as virtual surveying tools for the design of future modifications or additions to the involved buildings, parking lots, and landscaped areas. Distance comparisons between the non-georeference and the georeference models were completed. Their resulting statistical analysis indicated that even an accurate georeferencing approach introduced discrepancies in distances when they were measured from a virtual georeferenced 3D point-cloud model or from a non-georeferenced one. The comparison involved a total of 1016 distances from each of the two involved models. Those distances ranged from 4 to 700 ft. The Standard Deviation and Root Mean Square values of all discrepancies in distances were equal to 0.037 ft (1.1 cm). The resulting georeferenced model did not produce distance discrepancies larger than 0.111 ft (3.4 cm) with respect to the non-georeferenced one. This conclusion is valid for the case presented in this study and could be extrapolated to other cases with similarly accurate models.

Keyphrases: accuracy, georeferencing, lidar, scanning, terrestrial

In: Tom Leathem, Anthony Perrenoud and Wesley Collins (editors). ASC 2021. 57th Annual Associated Schools of Construction International Conference, vol 2, pages 311-319.

Links:	https://easychair.org/publications/paper/vJWc
	https://doi.org/10.29007/jp6x

BibTeX entry

@inproceedings{ASC2021:Comparison_Distance_Discrepancies_Georeferenced,
  author    = {Gustavo Maldonado and Marcel Maghiar and Ananya Augustine},
  title     = {Comparison of Distance Discrepancies in Georeferenced and Non-Georeferenced Terrestrial LiDAR Models},
  booktitle = {ASC 2021. 57th Annual Associated Schools of Construction International Conference},
  editor    = {Tom Leathem and Anthony Perrenoud and Wesley Collins},
  series    = {EPiC Series in Built Environment},
  volume    = {2},
  publisher = {EasyChair},
  bibsource = {EasyChair, https://easychair.org},
  issn      = {2632-881X},
  url       = {/publications/paper/vJWc},
  doi       = {10.29007/jp6x},
  pages     = {311-319},
  year      = {2021}}

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