Refined Satellite Image Orientation in the Free Open-Source  Photogrammetric Tools Apero/Micmac

Rupnik, Ewelina; Deseilligny, Marc Pierrot; Delorme, Arthur; Klinger, Yann

doi:10.5194/isprs-annals-iii-1-83-2016

Cited by 28 publications

(24 citation statements)

References 14 publications

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“…To develop the DSM, we obtained tri-stereo Pleiades satellite images of 0.5 m-resolution covering the terrace sequence between Xylokastro and Corinth. The open-source software MicMac 54,55 was used to create tie-points, orientate the images and calculate a 0.5 m-resolution DSM, using ground control points at 0 m elevation for several locations along the coastline. To reduce the topographic effects of vegetation, crops and man-made structures, the DSM was downsampled to 2 m resolution (Fig.…”

Section: Methodsmentioning

confidence: 99%

Lithospheric flexure and rheology determined by climate cycle markers in the Corinth Rift

Gelder¹,

Fernández‐Blanco²,

Melnick³

et al. 2017

Preprint

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Geomorphic strain markers accumulating the effects of many earthquake cycles help to constrain the mechanical behaviour of continental rift systems as well as the related seismic hazards. In the Corinth Rift (Greece), the unique record of onshore and offshore markers of Pleistocene ~100-ka climate cycles provides an outstanding possibility to constrain rift mechanics over a range of timescales. Here we use high-resolution topography to analyse the 3D geometry of a sequence of Pleistocene emerged marine terraces associated with flexural rift-flank uplift. We integrate this onshore dataset with offshore seismic data to provide a synoptic view of the flexural deformation across the rift. This allows us to derive an average slip rate of 4.5-9.0 mm·yr-1 on the master fault over the past ~610 ka and an uplift/subsidence ratio of 1:1.1-2.4. We reproduce the observed flexure patterns, using 3 and 5-layered lithospheric scale finite element models. Modelling results imply that the observed elastic flexure is produced by coseismic slip along 40-60° planar normal faults in the elastic upper crust, followed by postseismic viscous relaxation occurring within the basal lower crust or upper mantle. We suggest that such a mechanism may typify rapid localised extension of continental lithosphere.

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Section: Methodsmentioning

confidence: 99%

Lithospheric flexure and rheology determined by climate cycle markers in the Corinth Rift

Gelder¹,

Fernández‐Blanco²,

Melnick³

et al. 2017

Preprint

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show abstract

“…We used Micmac, a free open source software 18,19 , to estimate high-resolution DSMs from two or several Pleiades images. Micmac is a multi-resolution and multi-image method, which implements a coarse-to-fine extension of the maximum-flow image matching algorithm presented in Roy and Cox 20 .…”

Section: Dsm Calculationmentioning

confidence: 99%

“…The calculation of an accurate DSM requests that the configuration of the image acquisition is well known. While any Pleiades image is delivered with an empirical model of the Pleiades sensor at the moment of its acquisition (described by raw polynomial coefficients 19 ), this configuration model is approximate and thus needs to be refined. Micmac performs such refinement by using a bundle adjustment approach.…”

Section: Dsm Calculationmentioning

confidence: 99%

Digital surface model generation from multiple optical high-resolution satellite images

Mattéo

Tarabalka

Manighetti

2018

Image and Signal Processing for Remote Sensing XXIV

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The modern optical satellite sensors capture images in stereo and tri-stereo acquisition modes. This allows reconstruction of high-resolution (30-70 cm) topography from the satellite data. However, numerous areas on the Earth exhibit complex topography with a lot of "discontinuities". One case is tectonic fault sites, which form steep topographic escarpments enclosing narrow, deep corridors that mask parts of the ground. Built with common approaches (stereo or tri-stereo), a digital surface model (DSM) would not recover the topography in these masked zones. In this work, we have settled on a new methodology, based on the combination of multiple satellite Pleiades images taken with different geometries of acquisition (pitch and roll angles), with the purpose to generate fully-resolved DSMs at very high-resolution (50 cm). We have explored which configurations of satellites (i.e., number of images and ranges of pitch and roll angles) allow to best measure the topography inside deep and narrow canyons. We have collected seventeen Pleiades Images with different configurations over the Valley of Fire fault zone, USA, where the fault topography is complex. We have also measured sixteen ground control points (GCPs) in the zone. From all possible combinations of 2 to 17 Pleiades images, we have selected 150 combinations and have generated the corresponding DSMs. The calculations are done by solving an energy minimization problem that searches for a disparity map minimizing the energy, which depends on the likelihood for pixels to belong to a unique point in 3D as well as regularization terms. We have statistically studied which combinations of images deliver DSMs with the best surface coverage, as well as the lowest uncertainties on geolocalisation and elevation measures, by using the GCPs. Our first results suggest that an exceeding time between our acquisitions leads to DSM with a low covered area. We conclude that Stereo and Tri-Stereo acquisition in one-single pass of the satellite will systematically generate a better DSM than multi-date acquisition. We also conclude that in some cases, multi-date acquisitions with 7-8 images can improve the DSM robustness compared to multi-date acquisitions with fewer images. * matteo@geoazur.unice.fr;

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“…Rupnik et al. () examined various GCP configuration scenarios for the bundle adjustment of the Pleiades imagery where the number of GCPs employed in the adjustment and their distribution affected the quality of the sensor's georeferencing. Elkhrachy and El‐Damaty () studied the effect of the number of GCPs with various rectification models on the accuracy of the geometric correction.…”

Section: Introductionmentioning

confidence: 99%

Geometric accuracy improvement of WorldView‐2 imagery using freely available DEM data

Gašparović

Dobrinić

Medak

2019

The Photogrammetric Record

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This paper provides geometric accuracy improvements for very high resolution WorldView-2 (WV2) Ortho Ready Standard Level-2A (ORS2A) satellite images in the panchromatic (PAN) band. The entire process can be divided into two steps: (1) sensor orientation, which was conducted on 40 ground control points (GCPs) to determine which sensor model was best depending on various numbers of GCPs; and (2) orthorectification, whose main objective was to compare the accuracy of the process when using different freely available global digital elevation models (DEMs). The research showed that a sensor model based on rational polynomial coefficients (RPCs) with a shift or zero-order bias correction attained the best geopositioning accuracy during the orientation step with the use of seven GCPs. The highest accuracy was achieved for images orthorectified with the ALOS World 3D-30 m DEM (AW3D30).

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Refined Satellite Image Orientation in the Free Open-Source Photogrammetric Tools Apero/Micmac

Cited by 28 publications

References 14 publications

Lithospheric flexure and rheology determined by climate cycle markers in the Corinth Rift

Lithospheric flexure and rheology determined by climate cycle markers in the Corinth Rift

Digital surface model generation from multiple optical high-resolution satellite images

Geometric accuracy improvement of WorldView‐2 imagery using freely available DEM data

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