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Sensors 2016, 16(8), 1168; doi:10.3390/s16081168

Computing the Deflection of the Vertical for Improving Aerial Surveys: A Comparison between EGM2008 and ITALGEO05 Estimates

1
Department of Civil and Environmental Engineering (DICA), Politecnico di Milano, Milan 20133, Italy
2
Architecture, Built environment and Construction engineering (ABC), Politecnico di Milano, Mantova 46100, Italy
3
Department of Science and Technology (DIST), University of Naples “Parthenope”, Naples 80143, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Peter Teunissen
Received: 22 April 2016 / Revised: 13 July 2016 / Accepted: 18 July 2016 / Published: 26 July 2016
(This article belongs to the Section Remote Sensors)
View Full-Text   |   Download PDF [7236 KB, uploaded 26 July 2016]   |  

Abstract

Recent studies on the influence of the anomalous gravity field in GNSS/INS applications have shown that neglecting the impact of the deflection of vertical in aerial surveys induces horizontal and vertical errors in the measurement of an object that is part of the observed scene; these errors can vary from a few tens of centimetres to over one meter. The works reported in the literature refer to vertical deflection values based on global geopotential model estimates. In this paper we compared this approach with the one based on local gravity data and collocation methods. In particular, denoted by ξ and η, the two mutually-perpendicular components of the deflection of the vertical vector (in the north and east directions, respectively), their values were computed by collocation in the framework of the Remove-Compute-Restore technique, applied to the gravity database used for estimating the ITALGEO05 geoid. Following this approach, these values have been computed at different altitudes that are relevant in aerial surveys. The (ξ, η) values were then also estimated using the high degree EGM2008 global geopotential model and compared with those obtained in the previous computation. The analysis of the differences between the two estimates has shown that the (ξ, η) global geopotential model estimate can be reliably used in aerial navigation applications that require the use of sensors connected to a GNSS/INS system only above a given height (e.g., 3000 m in this paper) that must be defined by simulations. View Full-Text
Keywords: deflection of the vertical; aerial surveys; EGM2008; Least Squares Collocation deflection of the vertical; aerial surveys; EGM2008; Least Squares Collocation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Barzaghi, R.; Carrion, D.; Pepe, M.; Prezioso, G. Computing the Deflection of the Vertical for Improving Aerial Surveys: A Comparison between EGM2008 and ITALGEO05 Estimates. Sensors 2016, 16, 1168.

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