This paper presents a short history of the appraisal of laser scanner technologies in geosciences used for imaging relief by high-resolution digital elevation models (HRDEMs) or 3D models. A general overview of light detection and ranging (LIDAR) techniques applied to landslides is given, followed by a review of different applications of LIDAR for landslide, rockfall and debris-flow. These applications are classified as: (1) Detection and characterization of mass movements; (2) Hazard assessment and susceptibility mapping; (3) Modelling; (4) Monitoring. This review emphasizes how LIDAR-derived HRDEMs can be used to investigate any type of landslides. It is clear that such HRDEMs are not yet a common tool for landslides investigations, but this technique has opened new domains of applications that still have to be developed.
Remote sensing techniques for landslides investigations are undergoing rapid developments. The possibility of acquiring 3D information of the terrain with high accuracy and high spatial resolution is opening up new ways of investigating the landslide phenomena. Recent advances in sensor electronics and data treatment make these techniques affordable. The two major remote sensing techniques that are exponentially developing in landslides investigation are interferometric synthetic aperture radar (InSAR) (Fruneau et al. 1996; Colesanti et al. 2003; Squarzoni et al. 2003), and light detection and ranging (LIDAR) (Carter et al. 2001; Slob et al. 2002; Haugerud et al. 2003; Slob and Hack 2004). InSAR techniques are usually ground-based (Stow 1996; Tarchi et al. 2003) or satellite-based (Carnec et al. 1996; Singhroy 2009), and only rarely airborne. InSAR techniques are mainly dedicated to the detection and the quantification of small displacements over large areas. LIDAR (or laser scanning) provide high-resolution point clouds of the topography and has several applications that range from mapping (Ardizzone et al. 2007; Jaboyedoff et al. 2008a) to monitoring deformation (Gordon et al. 2001), landslides or rockfall displacements (Teza et al. 2007; Oppikofer et al. 2008; Abellan et al. 2010) to landslide in soils (Jaboyedoff et al. 2009a). The joint use of terrestrial laser scanning (TLS) and SAR techniques may help to understand landslide phenomena, as is discussed in Teza et al. (2008).
LIDAR is mainly used for landslide investigation to create accurate and precise high-resolution digital elevation models (HRDEM) in raster grids or triangulated irregular networks (TINs), which are 2.5D representations of the topography, or in true 3D point clouds with a high density of information. This density mainly depends on the position of the sensor: metric to decimetric resolution for airborne laser scanning (ALS) and centimetric to millimetric resolution for terrestrial laser scanning (TLS) (Shan and Toth 2008). Helicopter-based ALS can give a higher resolution than aircraft-based ALS and especially allows orientating the scanner in all directions (Vallet and Skaloud 2004).
The number of publications discussing the use of LIDAR in landslide studies has grown considerably during the last decade (Derron and Jaboyedoff 2010). Main applications range from mapping to monitoring and modelling slope mass movements. Two books were recently published: “Topographic laser ranging and scanning”, by Shan and Toth (2008) and “Laser Scanning for the Environmental Sciences”, by Heritage and Large (2009). The former provides a comprehensive compilation of the principles and fundamentals of LIDAR technologies, reflecting the state-of-the-art of all the physical aspects of the sensor (components, calibration, waveform analysis, quality control of LIDAR data, filtering and feature extraction techniques, etc.). Although some of the chapters may be slightly focused on the geomatics field (and hence, out of the scope for the readers of this review), the first three chapters by Petrie and Toth (2008) are an excellent basis for the understanding of instrumental issues: Chapter 1 describes basic (and not so basic) principles of laser profiling and scanning; Chapters 2 and 3 perform a detailed description of the main commercial and research systems currently available on the market for aerial and terrestrial LIDAR, respectively. As regards the book edited by Heritage and Large (2009), it provides numerous LIDAR applications to environmental sciences, being of great value for researches in the field of geomorphology, geostatistics, remote sensing and Geographic Information Systems (GIS). The contributions can be mainly divided into mapping (flooding areas, vegetation), geometrical aspects (study of geological outcrops and river gravel bars) and monitoring (rocky and sandy coastal erosion, river dynamics, etc.). Unfortunately, up to now there has been little effort to review the advances of LIDAR applications on landslides. This paper tries to fill this gap.
Laser scanning and/or LIDAR techniques
Short overview about LIDAR techniques and rangefinder
The acronym LASER (or laser) stands for Light Amplification by Stimulated Emission of Radiation. A laser is a device that produces and emits a beam (or a pulse series) of highly collimated, directional, coherent and in-phase electromagnetic radiation. As shown below, laser systems can be used for the acquisition of large amounts of 3D information of the terrain at an extremely fast recording rate (Fig. 1). Although LIDAR is a term commonly used in literature, laser scanner or laser range finder are preferred, which makes the link with past methods (laser ranging and laser profiling).
Laser scanning was developed in two ways, depending on the position of the sensor: airborne-based for ALS and ground-based for TLS. Basic principles and processing of the former are well-known issues since the end of the 1990s. A complete review of ALS systems can be found in Wehr and Lohr (1999) and in Baltsavias (1999). An updated and clear reference is the already commented book of Shan and Toth (2008). Literature on TLS has rapidly grown during the last 5 years (2005–2010). Petrie and Toth (2008) are a good reference for understanding basic principles of TLS. Detailed guidelines that should rule the use of the TLS in all the projects managed by the California Department of Transportation was written by Hiremagalur et al. (2007). Although an environmental scientist may have found this lecture out of the scope of his field of research, it provides useful information on standards and specifications for the quality control of different TLS. Finally, a brief review of LIDAR (and other conventional remote sensing techniques) applied to landslide monitoring is found in Prokop and Panholzer (2009) and in SafeLand Deliverable 4.1 (2010). A combination of both techniques, ALS and TLS, is frequently used to solve some acquisition problems for example the shadow areas when a scanned surface is parallel to the line of sight (LOS) of one of the sensor.
A laser scanner consists of a transmitter/receiver of laser beam and a scanning device. Two different methods for range determination are possible (Wehr and Lohr 1999): phase and pulse method. The former allows more accurate range determination but suffers from a limited range (Petrie and Toth 2008). Alternatively, the latter allows a greater range, and is therefore implemented in most ALS and TLS used for Earth surface observations, including landslide studies (Wehr and Lohr 1999; Baltsavias 1999).
Both airborne- and ground-based sensors send out laser pulses that get back-scattered by various objects (ground surface, vegetation, man-made constructions etc.) and record the returning signal. Pulsed laser scanners use the measurement of the time of flight (Δt) of the laser pulse to compute the distance (2 × d = c × Δt) and mirrors or mechanics to orientate the laser beam in a well-defined direction. Knowing this line of sight (LOS) direction and the attitude of the device (pitch, roll and yaw) allows determining the position Δx, Δy, Δz of a reflective surface relatively to the device. The range is measured without any artificial reflectors over an area equal to the laser’s spot dimension (beam width projected on the topography), which increases with distance due to the laser beam divergence (Petrie and Toth 2008) (Fig. 1).
The absolute position of an ALS sensor is defined by a Global Positioning System (GPS), and its attitude is recorded by an inertial system. Finally, the point cloud coordinates are estimated (x + Δx, y + Δy, z + Δy) with an accuracy of around 15 cm (1σ) by using ground control points (Habib 2008). In practice, the position and orientation (attitude) of the TLS sensor are not defined precisely in the field, unless the TLS device is also coupled with an inertial system and a GPS. This makes necessary a further georeferencing of the TLS point cloud. This process is carried out by aligning the TLS point cloud, either using a set of ground control points or using another already georeferenced point cloud.
Analysis of back-scattered laser pulses
Most ALS and a few of the TLS systems use the full waveform of the laser signal. The full waveform of the back-scattered pulse includes some information on the properties of the reflexive objects within the beam area. This allows for instance removing part of the vegetation effect (Duong 2006; Harding 2008; Heritage and Large 2009). Alternatively, range measurement using TLS can be undertaken without discriminating the full waveform, but recording several back-scattered pulses from one emitted pulse. This procedure makes it possible to distinguish and to filter intermediate-range objects (vegetation, wires, birds and other undesired points). For landslides applications, the last returned pulse is usually the most relevant. Nevertheless, if the vegetation is too dense the laser beam will not reach the ground, and direct visibility (LOS) between the TLS and the scanned surface is of course necessary. However, these limitations are common with other remote sensing techniques (surveying, radar and/or optical).
It must be said that one of the main issue in laser scanning is the removal of the vegetation (Harding 2008) either by automatic methods or manually. If vegetation is dense sometimes the DEM created from ALS data is not better than a standard resolution DEM (approx. 25 m grid size) obtained from topographic maps.
Accuracy, resolution and point density
The typical accuracy of the laser instrument is ±1.5 cm, within maximum distances of about 800–1,000 m (Manetti and Steinmann 2007). Nevertheless, the instrumental accuracy is usually lower in practical applications due to unfavourable conditions such as: poorly reflecting or very rough surfaces, parallel incident angles, bad weather conditions (rain or hot wind or fog), very bright ambient conditions, excessive range, etc.
Laser scanner’s resolution is a parameter that determines the level of detail that can be observed in a point cloud. It is divided into range and angular (or spatial) resolution (Kamerman 1993; Lichti and Jamtsho 2006): (a) Range resolution is the ability of a rangefinder to resolve two objects on the same LOS; (b) Angular resolution is the ability to resolve two objects on adjacent LOS. This parameter is governed by two variables: sampling interval (also called point spacing, which is user defined) and laser beamwidth (which depends on the distance and the instrument). The estimation of the TLS resolution is usually misunderstood and commonly interpreted as equal to the point spacing, obviating the influence of the laser beamwidth. Nevertheless, when sampling interval is lower than the laser beamwidth, fine details are in fact blurred. A detailed explanation of this effect can be found in Lichti and Jamtsho (2006). They proposed the use of the effective instantaneous field of view (EIFOV) as a measurement of the resolution of the TLS. The lower sampling interval proposed by these authors is 86% of the laser beamwidth.
For ALS, the point density usually ranges from 0.5 to 100 pts/m2, while for TLS it ranges usually from 50 to 10,000 pts/m2. In addition to the position, the intensity of the reflected signal is acquired. This parameter mainly depends on the beam wavelength, the type of material (colours and roughness of the reflective surface), soil moisture and angle of incidence (Ingensand 2006; Lichti 2007; Pesci et al. 2008; Voegtle et al. 2008).
The wavelength ranges between 500 and 1,700 nm (Wehr and Lohr 1999; Jaboyedoff et al. 2009a). For TLS, the acquisition range increases usually with longer wavelengths, from a few metres to 2,000 m if reflectivity of the surface is high (Jaboyedoff et al. 2009a).
Point cloud alignment
Alignment of the point cloud usually consists of a two-step process: a preliminary registration by a visual identification of homologous points and an optimization of the alignment using an Iterative Closest Points (ICP) procedure (Besl and McKay 1992; Chen and Medioni 1992). Using this algorithm, the differences between points are iteratively reduced by a minimization of a mean square cost function. Alternatively, the alignment over discrete parts of the slope can be carried out using the Roto-Translation technique described by different authors (Teza et al. 2007; Monserrat and Crosetto 2008; Oppikofer et al. 2009).
Short historical overview
Early attempts to acquire Earth surface data sets by ALS were performed along profiles using only an inertial system and other positioning technique for topographic mapping (Miller 1965; Krabill et al. 1984) with devices developed for water depth measurement (Hoge et al. 1980) or for altimetry purposes (Shepherd 1965). One of the first applications in geosciences of ALS (i.e., using inertial system coupled with GPS) has been to evaluate the topographical changes of the Greenland ice sheet (Krabill et al. 1995, 1999).
TLS appeared later than ALS at the end of the 1990s (Large and Heritage 2009). This instrument is an evolution of the electronic distance meter (EDM) and of total station, which benefits of the earlier ALS developments (many companies manufacturing ALS are now also selling TLS). EDM was developed during the late 1950s and early 1960s (Dallaire 1974). These instruments allow for a very accurate distance measurement. Nevertheless, these one-dimensional measurements were not suitable for the measurement of the 3D coordinates of single points (x, y, z). Furthermore, reflectors are usually required (Bromhead et al. 1988). By contrast, TLS measurements include real 3D information (x, y, z coordinates) plus intensity (I), and in some cases full waveform. In addition, TLS devices are reflectorless (Petrie and Toth 2008) allowing for a broad coverage of the surveyed area. The early tests for environmental application were made in the late 1990s and in the early twenty-first century (Lichti et al. 2000).
A systematic bibliographic survey was carried out by Derron and Jaboyedoff (2010) looking within the databases ISI Web of Knowledge and GEOREF. In this paper, the growth of the yearly production of publications and citations related to LIDAR and geosciences or landslide is analysed through logistic functions. The main outcome of this analysis is that the community of geoscientists working with laser scanning techniques is presently building an innovative and useful knowledge and that this fast development has the potential to continue for the next 5–10 years.
Classification of the main applications
TLS and ALS can be used for different types of investigation, which can be subdivided in 4 types (Table 1): (1) Landslide detection and characterization; (2) Hazard assessment and susceptibility mapping; (3) Modelling; (4) Monitoring. This classification may have overlaps, but allows us to classify the main objectives of the research. Our classification is based not only on the type of mass movements described by Cruden and Varnes (1996) but also on the processes linked to these phenomena. The selected approach to study the mass movement is strongly dependant on the scanned object: (1) we refer as “rockfalls” to all the slope processes formed in rock slopes, from the detachment of the instability to the propagation; (2) we refer as “landslides” to all the material that suffer large scale and slow rate of deformation, in either soft, fine materials (soils) and/or weathered and weak rocky material, including deep-seated gravitational slope deformation (DSGSD) (Agliardi et al. 2009); finally, (3) we refer as “debris-flows” to slope movements formed by debris type of material, moving down the slope as a flow. This classification makes sense in terms of LIDAR analysis, because the analyses of the geomorphic features are not necessarily scale dependant. As an example, it can be impossible to distinguish a DSGSD from a classical landslide only by inspecting a hillshade relief without knowing the scale.
Detection and characterization of mass movements
ALS permits an improvement in the landslide inventory mapping and more generally of geological mapping (Borlat et al. 2007), by increasing the resolution of the landslide contours, permitting to identify scarps and displaced material. Nevertheless, the same conceptual methods to detect landslides are still usually employed (Soeters and Van Westen 1996; Keaton and DeGraff 1996). The morphological features of the landslides (e.g. scarps, mobilized material, foot) are easy to delineate based on hillshades of the produced HRDEM (Carter et al. 2001; Haugerud et al. 2003; Ardizzone et al. 2007; Jaboyedoff et al. 2008a; Corsini et al. 2009). This approach does not replace field investigations, but it changes the fieldwork methods, which become part of the validation processes of a landslide inventory produced by HRDEM analysis (Fig. 2).
The detection can be performed either manually (e.g. expert criteria such as eye inspection) or automatically (e.g. feature detection such as the curvature or roughness of the topography). McKean and Roering (2004) showed that spreading of topographic orientations within an earth-flow is higher than that in undisturbed area. An extension of this method using Fourier analysis of the relief demonstrates that this method can classify more than 80% of total area that has already suffered a landslide (or not) in western US (Booth et al. 2009). Geomorphic criterion based on geostatistics (Glenn et al. 2006) succeeds in differencing landslide activities. Nevertheless, such methods are not easy to apply due to following reasons: (a) expert criteria are needed (interpretation of the results) and (b) the presence of vegetation may degrade the DEM quality (Kasai et al. 2009). In addition, the detailed morphology provided by HRDEM coupled with geologic information can allow forecasting of the sensitive zones even if the triggering is human induced (Schulz 2007). The interpretation of DSGSD is also improved by using HRDEM (Agliardi et al. 2009; Oppikofer 2009; Corsini et al. 2009) especially because it permits a precise delineation of the limits (Fig. 3).
Only few applications exist on landslide characterization (Rowlands et al. 2003), but in several cases TLS is a very useful tool to interpret the landslide mechanism, delineate limits and estimate volumes (Corsini et al. 2009; Dunning et al. 2009). Jaboyedoff et al. (2009a) shows a case study of circular landslides in silty sediments in river banks.
TLS and ALS techniques are responsible for a great improvement in rock slope characterization, mainly because the rock instabilities are principally controlled by structures that are at least locally planar. The TLS applications characterizing rock mass are numerous (Slob and Hack 2004; Jaboyedoff et al. 2007; Oppikofer et al. 2009; Sturzenegger and Stead 2009; Armesto et al. 2009; Lato et al. 2009), but still quite rare for ALS-DEM.
Structural analysis at regional scale are proposed using ALS-derived HRDEM using the principle of COLTOP (Jaboyedoff et al. 2004a, 2007, 2009b), which allows to attribute a unique colour for each topographic orientation. This permits also to create stereonets on the basis of plane orientations measured directly on the point cloud (Fig. 4). The main sets of structural features have been identified in several rockslides in Norway (Derron et al. 2005). This approach also allowed a fast structural characterization of the hardly accessible Mount Steele rockslide in Yukon, Canada (Brideau et al. 2009) and the reinterpretation of former rockslide such as Frank slide (Sturzenegger et al. 2007a; Froese et al. 2009). At regional scale, the fjord valley of Tafjord in Norway has been investigated in order to characterize the present and former rock slope instabilities, such as their volume and mechanisms (Oppikofer 2009).
TLS characterization of rock slopes are among the first applications using TLS for slope mass movement, mainly to obtain accurate slope profile and discontinuity sets orientations (Bornaz et al. 2002; Slob et al. 2002). A technical report of the US Department of Transportation (Kemeny and Turner 2008) provides a brief introduction of the main commercial hardware and softwares and best practices for fieldwork campaigns.
Several studies are proposing different ways to characterize discontinuity sets, which can be mainly classified as (a) using fitting planes (Fernández 2005; Abellan et al. 2006; Oppikofer et al. 2008; Sturzenegger and Stead 2009), (b) using TIN surfaces as indicators of the plane orientations (Feng et al. 2001; Slob et al. 2002). A description of the methodology employed for rockmass characterization using the commercial software Split-FX is provided in Kemeny and Post (2003) and Kemeny and Turner (2008). Several authors (Lato et al. 2009; Abellán et al. accepted) have shown that there is an optimal number of points for the point cloud to get reliable results depending on the precision of the device: a sparse TIN suffers from smoothening over corners and edges, creating inaccuracies in plane representation. On the other hand, a dense TIN is affected by data noise. (c) Other techniques allow for the automatic delimitation of a set of neighbourhood points characterized by the same normal vector. As a result, the calculation of the orientation of the discontinuity planes is obtained. The COLTOP technique (Jaboyedoff et al. 2004a, 2007, 2009b; Derron et al. 2005) permits to visualize the orientation of each discontinuity set by a unique colour, which makes the approach very similar to a field data acquisition (COLTOP-3D, www.coltop3d.ch). The extracted data permit to analyse the rock instability mechanisms (Janeras et al. 2004; Jaboyedoff et al. 2008b; Oppikofer et al. 2009).
Different authors have pointed out the existence of two types of biases in the determination of the orientation of discontinuities (e.g. Sturzenegger and Stead 2009; Lato et al. 2009): (a) scale bias, when discontinuity sets are smaller than the spatial resolution (point spacing) and (b) orientation bias, when the incidence angle of a given data set influences the spatial resolution, and hence, the number of poles in stereonet when doing automatic procedures.
Another area of application that is merging in rock slope characterization is the roughness determination (Fardin et al. 2004; Haneberg 2007; Tatone and Grasselli 2009) aimed to better quantify the well-known methods for rock mass rating systems (Romana 1993). Nevertheless, certain limitations are linked to the achievement of this aim, such as the intrinsic instrumental accuracy, resolution and the influence of different scanner positions on the final results (Sturzenegger et al. 2007b). Although these limitations, further studies are necessary due to the great potential of such methods assuming self-similarity hypothesis (Fardin et al. 2004).
ALS-derived DEM gives an accurate topography and permits to identify morphologies that are significant in order to characterize the past activity. To this end, morphometric indicators such as roughness, and curvature of the slope are used (Staley et al. 2006; Cavalli and Marchi 2008). This approach gives quite good results in discriminating the past debris-flow activity (Cavalli and Marchi 2008) but presents some limitations (Staley et al. 2006). The variograms inspection gives promising results for characterization of the landforms (Trevisani et al. 2009).
Hazard assessment, susceptibility mapping and modelling
One of the earliest applications of ALS-DEM in landslide susceptibility mapping and modelling is the work of Dietrich et al. (2001) (see also Montgomery et al. 2000). They showed that a 1 m resolution ALS-DEM improved greatly the results of the model SHALSTAB, an infinite slope stability model. One of the most achieved study of landslide hazard assessment using ALS-DEM is the one made by the USGS on the Puget Sound area (Washington state; Baum et al. 2005). In this study, field investigation is coupled with HRDEM analysis and shallow landslide modelling using TRIGRS (Savage et al. 2003), a sophisticated infinite slope model including transient infiltration. This study demonstrates improvements provided by ALS-DEM for hazard mapping. Along the same line, Haneberg et al. (2009) have shown convincing results for shallow landsliding, coupling an infinite slope model with geomorphic characterizations using an ALS-DEM.
Of course, the traditional hazard mapping by field investigation is improved by ALS-DEM, especially for inventories but also for characterizing the susceptibility using morphometric indicators (Chigira et al. 2004; Haneberg et al. 2005; Jaboyedoff et al. 2008a). We can also expect that it will soon possible to infer hazard by comparing several ALS-DEM of different epochs. This was already proposed by Chigira et al. (2004) who emphasized the possibility to use two inventories to assess hazard, but in their application the first inventory was still produced by field work only.
The ALS-DEM allows a detailed delimitation of the landslides on the topographical surface (van den Eeckhaut et al. 2007; Corsini et al. 2009). Using these limits and the DEM, it is possible to infer the failure surface in 3D. For instance, the sloping base level (SLBL) concept (Jaboyedoff et al. 2004b, 2009b) makes it possible to obtain very quickly a planar or curved quadratic surface by using simple geometrical rules. For example, Fig. 2 shows La Frasse landslide in the Swiss Alps and the expected failure surface of a fast-moving part.
TLS is mostly used for characterization or monitoring of landslides and not really for hazard mapping. Nevertheless, TLS can greatly improve the site-specific modelling, especially when the topography is changing and if only a poor DEM is available. For example, a detailed slope profile extracted from a TLS-DEM has permitted to identify the destabilized zone of an earth-flow using a standard Bishop analysis (Jaboyedoff et al. 2009c).
Regional rockfall hazard or susceptibility assessment from source area to rockfall propagation using ALS-DEM is not yet implemented as a routine, although all the pieces of the puzzle are present. The first issue is to locate the source areas. This is often performed at regional scale using simple slope angle thresholds (Guzzetti et al. 2003; Frattini et al. 2008). But, as shown by Loye et al. (2009), more information can be potentially extracted from the slope angle distribution. By decomposing the histogram of slope angles of an area into Gaussian distributions, it is possible to identify the threshold above which the relief is dominantly composed of cliffs (Fig. 5). This threshold depends on the type of bedrock, the presence or absence of a soil cover and the DEM resolution (Loye et al. 2009). This method makes it possible to discriminate efficiently the true cliffs from the one drawn on topographic maps. In addition, as proposed by Günther (2003) and Jaboyedoff et al. (2004c), structural analysis performed on ALS-DEM (Fig. 4) can be the basis for kinematic test. As discussed in Janeras et al. (2004), the accuracy of the results is greatly improved by using a HRDEM.
Hazard assessment requires often performing trajectographic modelling in order to delineate the propagation area. The modelling has been greatly improved by the ALS-DEM (Agliardi and Crosta 2003; Lan et al. 2007) by introducing more dispersion in the propagation (Fig. 6), as demonstrated by Agliardi and Crosta (2003). In addition, the kinetic energy profile is greatly modified when the resolution of the DEM is increased. Both parameters are of primary importance for hazard mapping and dimensioning of mitigation measures.
A great improvement in the rockfall hazard assessment is the monitoring of fallen blocks from a cliff between two epochs or more (Rosser et al. 2005; Lim et al. 2006; Lato et al. 2009; Abellan et al. 2010; Pedrazzini et al. 2010). Indeed, such approaches allow for the quantification of the magnitude and activity of rockfalls in a cliff. Rosser et al. (2007) quantified the increase in rockfall activity some months previous to the occurrence of larger events. Similarly, when this activity decreases, it may be inferred that the potential instability becomes stabilized during a given period (Pedrazzini et al. 2010). In addition, new methods of mobile terrestrial LIDAR along road cuts already produce detailed 3D models that provide data for structural analysis. If such acquisitions are repeated over time, they can be used to detect the most active areas (Lato et al. 2009).
As suggested by different authors (e.g. Jakob 2005; Horton et al. 2008), process-based modelling of debris-flows is a difficult task because of the complexity of the phenomenon and the variability of controlling factors. Detailed topography (slope angle of channels as well as the channel profile) together with the available channel material can be critical parameters (Hungr 2005).
These are the major input from both ALS- and TLS-DEM, and they are critical to assess properly the volumes that can be mobilized. Based on the topography curvature of ALS-DEM and other properties, it is also possible to extract potential source areas for debris-flows (Horton et al. 2008). The second improvement provided by ALS-DEM is the possibility to improve the modelling of propagation, despite the fact that computing time is very high if a full resolution ALS-DEM is used to compute the models on large areas. Similarly to rockfall modelling, Stolz and Huggel (2008) have shown that the modelling of debris-flows can be really improved by using HRDEM. Nevertheless, it must be emphasized that as a channel is a dynamic body and breakouts are always possible, a full resolution approach can also be a pitfall for models. For instance road embankments on the HRDEM are diverting flow, while in reality road bridges often exist to let the flow pass. Nevertheless, ALS-derived HRDEM with reduced resolution (10 × 10 m) permits to obtain very good results for propagation calculations at regional scale (Horton et al. 2008).
Before the existence of remote sensing techniques such as LIDAR, RADAR and photogrammetry, landslide monitoring was based on single-point measurements, using either GPS or total stations. But obtaining the complete field of displacements for the whole landslide is of great help to understand landslide kinematics and failure mechanism (Fig. 7). Laser scanning is nowadays a common tool for displacement monitoring even if few published papers exists. The basic principle is the same for both ALS- and TLS-DEM, requiring at least two epochs of HRDEM acquisition. Nevertheless, as monitoring requires both high resolution and high precision data sets, most of the works have been done up to now using TLS-derived HRDEMs. The results are either vectors between two points (or common areas) or distances between two data sets (point to surface comparison) either in a user-defined direction or as shortest distance (Hausdorff distance) between the two surfaces. This difference calculation allows for the computation of volume differences, as is discussed by different authors (Bitelli et al. 2004; Chen et al. 2006; Corsini et al. 2007; Teza et al. 2007; Dewitte et al. 2008; Jaboyedoff et al. 2009a; Prokop and Panholzer 2009; Mueller and Loew 2009; Avian et al. 2009; Baldo et al. 2009).
The standard deviation of the measurements between two epochs can be quite high, depending on multiple factors, such as the quality of the TLS data sets, the density of points, the existence of vegetation, the roughness of the relief, the quality of the alignment between the scans, the relative or absolute positions of the TLS and the variation of the surface of the terrain between the two epochs. For instance, these values were not less than 5 cm at 100 m for Prokop and Panholzer (2009), or 3 cm for a 300 m range for Teza et al. (2008). In our recent experiences, it is possible to compare TLS data sets acquired consecutively and reach values of the standard deviation of around 1 cm for close ranges (less than 100 m) and high point densities. This is in agreement with the results obtained on the “fast” moving landslide of Super-Sauze (France) where it was possible to measure velocities of 3.2 cm/day (Travelletti et al. 2008).
The low number of monitored landslides using ALS-derived HRDEM is due to the lower precision of ALS compared to TLS (~15 cm vs. ~1.5 cm). As a result, comparison of such HRDEM requires a longer period between two acquisitions to obtain reliable results. Nevertheless, using classical photogrammetry on ancient aerial photos, it is possible to obtain displacement maps simply comparing objects locations on the pictures and on the ALS-DEM (Roering et al. 2009; Baldo et al. 2009).
Monitoring surface displacements in rock slopes is, in a way, simpler than in soil slopes because the displacements can be considered as rigid body transformations (Teza et al. 2007; Monserrat and Crosetto 2008; Abellan et al. 2009; Oppikofer et al. 2009). As a consequence, it is easier to identify and decompose the movements as a combination of translations and rotations of different parts of the slope. A good example for monitoring surface displacements is the huge slope displacements that occurred at the eastern flank of the Eiger (Switzerland), which was moving by more than 70 cm/day during the paroxysmal activity (Oppikofer et al. 2008). The detailed displacement analysis using the rigid body transformations of the upper part of the Åknes rockslide in Norway combined with detailed structural analysis allowed to derive the possible landslide mechanism (Oppikofer et al. 2009). Recent developments improved this methodology by introducing Euler angles to describe the rotational movement of the Cinque Torri rock towers in Italy (Viero et al. 2010).
Together with these monitoring results, the possibility to link spatial and temporal prediction of rockfalls constitutes a great challenge for landslide monitoring. Indeed, two different precursory indicators are currently being investigated: (1) the increase in rockfall activity before the final collapse, shown by Rosser et al. (2007) for a hard rock cliff at the coast of Staithes (UK); (2) the detection of precursory displacements is investigated for large rockfalls (e.g. 125 cm/day preceding a 170,000 m3 partial collapse of the Eiger rockslide, Oppikofer et al. 2008) and fragmental rockfalls (e.g. centimetric displacements preceding rockfalls with few to hundred cubic metres, Abellan et al. 2009, 2010) (Fig. 8). Although in certain cases precursory movements can be of the same order of magnitude than instrumental errors, different authors have observed that errors can be considerably reduced by taking into account the information of the neighbouring points, i.e. noise reduction by filtering or averaging (Lindenbergh and Pfeifer 2005; Monserrat and Crosetto 2008; Abellan et al. 2009). As an example, it was shown that it is possible to detect millimetric surface displacements in an outdoor experiment, even if single points had a higher standard deviation (Abellan et al. 2009).
As we already mentioned, it is possible to monitor the channel changes using TLS (Oppikofer 2009; Theules et al. 2009) (Fig. 9). Recently, Scheidl et al. (2008) were able to compare two deposition areas of debris-flows that occurred during the heavy rainfall of August 2005 in Switzerland using two ALS-DEM acquisitions. They obtained good results but still with high errors that can reach more than 50% for eroded volumes, which is probably overestimated because the errors are computed pixel by pixels.
Discussions and perspectives
The real use for landslide studies of HRDEM from ALS or TLS started in 2000, although some developments started in the 1960s. For ALS this comes from the fact that GPS has become available for public application during the mid-1990s. The TLS device market developed later because of the lack of software for 3D data processing and problems for handling huge amount of data (point clouds with several millions of points).
Main advantages of the technique are the acquisition of real 3D information, the fast data acquisition, easy set up and portability and its high resolution, at least for the ground-based instrument. Reversely, the main limitations of the ground-based technique are the existence of shadow areas caused by rugged topography, the huge quantity of acquired information and the needed post-processing techniques for filtering and alignment of the data sets, i.e. when a large area is scanned, several data sets must be merged and due to error propagation the alignment started to be more complicated and time-consuming to obtain reliable results.
As we have seen the number of applications is increasing very quickly. This is underlined by the fact that the recent syntheses about landslides risk include laser scanning and HRDEM as important tools (Van Westen et al. 2006; Fell et al. 2008; Derron and Jaboyedoff 2010). Figures including LIDAR images are presently published in papers without any other information, which means that it is now considered as a routine method demonstrative enough to be self-explanatory (Jibson 2006).
All the presented applications indicate that research has not yet well defined the limit of the LIDAR techniques, without taking into account the future advances, especially for monitoring purposes. It is clear that HRDEM is an inestimable support not only for landslide mapping, but also for hazard assessment. The use of the full data quality for modelling purposes is still not achieved.
LIDAR intensity provides some information on the material type, but it remains a difficult task to discriminate different materials (e.g. lithologies) based on the laser reflectivity because of the various causes of intensity variations. This has been applied with good results to the classification of river bed at different epochs by identifying water–land boundary (Höfle et al. 2009). Some research groups are now looking at further refinement of LIDAR imaging coupled with other remote sensing techniques. LIDAR data sets merged with RGB colours obtained from optical camera were tested on the Vesuvius crater providing encouraging results but is still far from an operative one (Pesci et al. 2007, 2008). Coupled with LIDAR data sets, the hyperspectral camera permits to get additional information on rock characteristics (Kurz et al. 2008).
One of the most promising advances is probably to analyse simultaneously InSAR results and HRDEM. The problem is to obtain coherent results between LOS distance changes from InSAR data and the 3D displacement vector extracted from LIDAR data. In any case, the first results are already consistent for TLS (Teza et al. 2008) and for ALS (Roering et al. 2009).
Above synthesis and considerations shows that HRDEM is increasingly being used in the landslide community, becoming an essential tool for landslide risk management s.l. In a few years, LIDAR sensors will probably be a standard tool for landslide analysis. Following the current trend, full coverage by ALS-DEM in most of the rich countries will be reached within the next 10 years. As the technique is also progressing, more accurate and precise ALS and TLS devices will appear, allowing for the generation of more accurate DEM. In addition, the vertical cliffs will certainly be also better imaged by new equipments, such as helicopter-based LIDAR sensors. Nevertheless, the huge amount of data will remain a problem as the computers will need to be more powerful with increasing data acquisition capacity as it is already the case with mobile LIDAR systems that have an acquisition rate of up to 200 kHz.
The real challenge is to develop new methods to better take benefit from HRDEM. Indeed a lot of new information can be extracted from such DEM that we not yet contrived to do. Although great advances have been developed in geometrical aspects, most of the conceptual models remain tied to the past. Could we combine these accurate HRDEM with a better modelling of landslide mechanisms (including rockfalls and debris-flows)? Is it possible to integrate surface measurements with early warning systems? The challenge for HRDEM exploitation is not only linked to landslide but also for instance to the analysis of fracturing at the surface using HRDEM and its extrapolation to underground.
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We are grateful to the National Swiss Foundation for Science project Number 200021-118105 and the EU project SafeLand (Grant Agreement No: 226479). We thank Dr. Greg Stock, geologist at Yosemite National Park, for providing us LIDAR data and J. Theules from CEMAGREF (Grenoble, France) who provided us one figure for illustrating TLS and debris-flows. In addition we are grateful to Marie Charrière and Florian Humair for editing some parts of the texts. The three anonymous reviewers are acknowledged for their valuable comments that helped us to improve the manuscript.
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Jaboyedoff, M., Oppikofer, T., Abellán, A. et al. Use of LIDAR in landslide investigations: a review. Nat Hazards 61, 5–28 (2012). https://doi.org/10.1007/s11069-010-9634-2
- Laser scanner
- High-resolution DEM
- Topography analysis
- Structural analysis