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Remote Sens. 2014, 6(6), 5407-5427; doi:10.3390/rs6065407
Article

Comparing Two Photo-Reconstruction Methods to Produce High Density Point Clouds and DEMs in the Corral del Veleta Rock Glacier (Sierra Nevada, Spain)

1,* , 2, 2 and 2
Received: 28 February 2014; in revised form: 30 May 2014 / Accepted: 3 June 2014 / Published: 11 June 2014
(This article belongs to the Special Issue Remote Sensing in Geomorphology)
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Abstract: In this paper, two methods based on computer vision are presented in order to produce dense point clouds and high resolution DEMs (digital elevation models) of the Corral del Veleta rock glacier in Sierra Nevada (Spain). The first one is a semi-automatic 3D photo-reconstruction method (SA-3D-PR) based on the Scale-Invariant Feature Transform algorithm and the epipolar geometry theory that uses oblique photographs and camera calibration parameters as input. The second method is fully automatic (FA-3D-PR) and is based on the recently released software 123D-Catch that uses the Structure from Motion and MultiView Stereo algorithms and needs as input oblique photographs and some measurements in order to scale and geo-reference the resulting model. The accuracy of the models was tested using as benchmark a 3D model registered by means of a Terrestrial Laser Scanner (TLS). The results indicate that both methods can be applied to micro-scale study of rock glacier morphologies and processes with average distances to the TLS point cloud of 0.28 m and 0.21 m, for the SA-3D-PR and the FA-3D-PR methods, respectively. The performance of the models was also tested by means of the dimensionless relative precision ratio parameter resulting in figures of 1:1071 and 1:1429 for the SA-3D-PR and the FA-3D-PR methods, respectively. Finally, Digital Elevation Models (DEMs) of the study area were produced and compared with the TLS-derived DEM. The results showed average absolute differences with the TLS-derived DEM of 0.52 m and 0.51 m for the SA-3D-PR and the FA-3D-PR methods, respectively.
Keywords: three dimensional photo-reconstruction (3D-PR); point cloud; terrestrial laser scanner (TLS); rock glacier; digital elevation models (DEMs) three dimensional photo-reconstruction (3D-PR); point cloud; terrestrial laser scanner (TLS); rock glacier; digital elevation models (DEMs)
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.

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MDPI and ACS Style

Gómez-Gutiérrez, Á.; de Sanjosé-Blasco, J.J.; de Matías-Bejarano, J.; Berenguer-Sempere, F. Comparing Two Photo-Reconstruction Methods to Produce High Density Point Clouds and DEMs in the Corral del Veleta Rock Glacier (Sierra Nevada, Spain). Remote Sens. 2014, 6, 5407-5427.

AMA Style

Gómez-Gutiérrez Á, de Sanjosé-Blasco JJ, de Matías-Bejarano J, Berenguer-Sempere F. Comparing Two Photo-Reconstruction Methods to Produce High Density Point Clouds and DEMs in the Corral del Veleta Rock Glacier (Sierra Nevada, Spain). Remote Sensing. 2014; 6(6):5407-5427.

Chicago/Turabian Style

Gómez-Gutiérrez, Álvaro; de Sanjosé-Blasco, José J.; de Matías-Bejarano, Javier; Berenguer-Sempere, Fernando. 2014. "Comparing Two Photo-Reconstruction Methods to Produce High Density Point Clouds and DEMs in the Corral del Veleta Rock Glacier (Sierra Nevada, Spain)." Remote Sens. 6, no. 6: 5407-5427.


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