Accuracy Evaluation of a Mobile Mapping System With Advanced Statistical Methods

Toschi, I.; Rodríguez‐Gonzálvez, Pablo; Remondino, Fabio; Minto, Simone; Orlandini, Stefano; Fuller, Alice

doi:10.5194/isprsarchives-xl-5-w4-245-2015

Cited by 59 publications

(40 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Usually, accuracy measures are based on the hypothesis that errors follow a normal dispersal (SAX- ENA and SINGH 2005;TOSCHI et al 2015). However, it should be revised carefully.…”

Section: Maunementioning

confidence: 99%

Scenario-Based Validation of Moderate Resolution DEMs Freely Available for Complex Himalayan Terrain

Singh

Gupta

Snehmani

et al. 2015

Pure Appl. Geophys.

View full text Add to dashboard Cite

Accuracy of the Digital Elevation Model (DEM) affects the accuracy of various geoscience and environmental modelling results. This study evaluates accuracies of the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Global DEM Version-2 (GDEM V2), the Shuttle Radar Topography Mission (SRTM) X-band DEM and the NRSC Cartosat-1 DEM V1 (CartoDEM). A high resolution (1 m) photogrammetric DEM (ADS80 DEM), having a high absolute accuracy [1.60 m linear error at 90 % confidence (LE90)], resampled at 30 m cell size was used as reference. The overall root mean square error (RMSE) in vertical accuracy was 23, 73, and 166 m and the LE90 was 36, 75, and 256 m for ASTER GDEM V2, SRTM X-band DEM and CartoDEM, respectively. A detailed error analysis was performed for individual as well as combinations of different classes of aspect, slope, land-cover and elevation zones for the study area. For the ASTER GDEM V2, forest areas with North facing slopes (0°-5°) in the 4th elevation zone (3773-4369 m) showed minimum LE90 of 0.99 m, and barren with East facing slopes ([60°) falling under the 2nd elevation zone (2581-3177 m) showed maximum LE90 of 166 m. For the SRTM DEM, pixels with South-East facing slopes of 0°-5°in the 4th elevation zone covered with forest showed least LE90 of 0.33 m and maximum LE90 of 521 m was observed in the barren area with North-East facing slope ([60°) in the 4th elevation zone.In case of the CartoDEM, the snow pixels in the 2nd elevation zone with South-East facing slopes of 5°-15°showed least LE90 of 0.71 m and maximum LE90 of 1266 m was observed for the snow pixels in the 3rd elevation zone (3177-3773 m) within the South facing slope of 45°-60°. These results can be highly useful for the researchers using DEM products in various modelling exercises.

show abstract

“…Usually, accuracy measures are based on the hypothesis that errors follow a normal dispersal (SAX- ENA and SINGH 2005;TOSCHI et al 2015). However, it should be revised carefully.…”

Section: Maunementioning

confidence: 99%

Scenario-Based Validation of Moderate Resolution DEMs Freely Available for Complex Himalayan Terrain

Singh

Gupta

Snehmani

et al. 2015

Pure Appl. Geophys.

View full text Add to dashboard Cite

show abstract

“…Various authors have presented the use of terrestrial MMS to provide extremely dense 3D point coverage of building facades (Barber et al, 2008;Haala and Rothermel, 2015;Toschi et al, 2015). With regards to the test conducted in this paper, the integration is mainly performed with these aims:…”

Section: Data Integration For Further Analyses and Visualizationmentioning

confidence: 99%

Oblique Photogrammetry Supporting 3d Urban Reconstruction of Complex Scenarios

Toschi

Ramos

Nocerino

et al. 2017

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

Self Cite

View full text Add to dashboard Cite

ABSTRACT:Accurate 3D city models represent an important source of geospatial information to support various "smart city" applications, such as space management, energy assessment, 3D cartography, noise and pollution mapping as well as disaster management. Even though remarkable progress has been made in recent years, there are still many open issues, especially when it comes to the 3D modelling of complex urban scenarios like historical and densely-built city centres featuring narrow streets and non-conventional building shapes. Most approaches introduce strong building priors/constraints on symmetry and roof typology that penalize urban environments having high variations of roof shapes. Furthermore, although oblique photogrammetry is rapidly maturing, the use of slanted views for façade reconstruction is not completely included in the reconstruction pipeline of state-of-the-art software. This paper aims to investigate state-of-the-art methods for 3D building modelling in complex urban scenarios with the support of oblique airborne images. A reconstruction approach based on roof primitives fitting is tested. Oblique imagery is then exploited to support the manual editing of the generated building models. At the same time, mobile mapping data are collected at cm resolution and then integrated with the aerial ones. All approaches are tested on the historical city centre of Bergamo (Italy).

show abstract

“…to acquire a georeferenced 3D point cloud, the aim of this step is to analyze, in the CH field, the quality of the MLS point cloud using a ground truth provided by a TLS. To dismiss the uncertainties associated to the global coordinate geo-referencing, a registration phase with the Iterative Closest Point (ICP) technique is carried out, prior to the MLS point cloud evaluation [51]. As a result, only those errors affecting the 3D point cloud of the architectural elements are analyzed.…”

Section: Accuracy Assessment Protocolmentioning

confidence: 99%

Mobile LiDAR System: New Possibilities for the Documentation and Dissemination of Large Cultural Heritage Sites

et al. 2017

View full text Add to dashboard Cite

Abstract:Mobile LiDAR System is an emerging technology that combines multiple sensors. Active sensors, together with Inertial and Global Navigation System, are synchronized on a mobile platform to produce an accurate and precise geospatial 3D point cloud. They allow obtaining a large amount of georeferenced 3D information in a fast and efficient way, which can be used in several applications such as the 3D recording and reconstruction of complex urban areas and/or landscapes. In this study the Mobile LiDAR System is applied in the field of Cultural Heritage aiming to evaluate its performance with the purpose to document, divulgate, or to develop an architectural analysis. This study was focused on the Medieval Wall of Avila (Spain) and, specifically, the performed accuracy tests were applied in the "Alcazar" gate (National Monument from 1884). The Mobile LiDAR System is then compared to the most commonly employed active sensors (Terrestrial Laser Scanner) for large Cultural Heritage sites in regard to time, accuracy and resolution of the point cloud. The discrepancies between both technologies are established comparing directly the 3D point clouds generated, highlighting the errors affecting the architectural structures. Consequently, and based on a detailed geometrical analysis, an optimization methodology is proposed, establishing a segmented and classified cluster for the structures. Furthermore, three main clusters are settled, according to the curvature: (i) planar or low curvature; (ii) cylindrical, mild transitions and medium curvature; and (iii) the abrupt transitions of high curvature. The obtained 3D point clouds in each cluster are analyzed and optimized, considering the reference spatial sampling, according to a confidence interval and the feature curvature. The presented results suggest that Mobile LiDAR System is an optimal approach, allowing a high-speed data acquisition and providing an adequate accuracy for large Cultural Heritage sites.

show abstract

Accuracy Evaluation of a Mobile Mapping System With Advanced Statistical Methods

Cited by 59 publications

References 15 publications

Scenario-Based Validation of Moderate Resolution DEMs Freely Available for Complex Himalayan Terrain

Scenario-Based Validation of Moderate Resolution DEMs Freely Available for Complex Himalayan Terrain

Oblique Photogrammetry Supporting 3d Urban Reconstruction of Complex Scenarios

Mobile LiDAR System: New Possibilities for the Documentation and Dissemination of Large Cultural Heritage Sites

Contact Info

Product

Resources

About