Aerial photography and digital photogrammetry for landslide monitoring

Abstract

A review is given of the techniques that are available to extract relevant information from multi-temporal aerial photographs for use in the monitoring stage of landslide assessments. It is shown that aerial photograph interpretation reveals qualitative information on surface characteristics, which is helpful in detecting landslide features and inferring the mechanisms involved. Photogrammetrically derived products can be used to quantify these processes, providing distinctive advantages. Comparison of digital elevation models (DEMs) from different times provides detailed information on changes in surface topography, whereas orthophotos can be used to measure horizontal displacements. The various factors influencing the quality of the products are also identified. Examples from a case study on the Mam Tor landslide are used to illustrate the benefits of the different approaches.

Assessment of the Evolution of a Landslide Using Digital Photogrammetry and LiDAR Techniques in the Alpujarras Region (Granada, Southeastern Spain)

“…The results using photogrammetric workstations have offered better and more accurate interpretations of changes on the terrain surface over the past decade [8,[13][14][15][16].…”

“…For the analysis of single landslides, two approaches are available: the first is based on a comparison between DEMs from different flights, calculating distances and volumes [1,[7][8][9][10][11][13][14][15][16][17][18][19][20][21][22][23][24][25][26][29][30][31][32][36][37][38]48,52]; the second approach consists of a comparison between points and other elements identified without any ambiguity between the different surveys, enabling the determination of 3D displacement vectors for accurate identification of the landslide kinematics [10,11,[13][14][15][16][17][18]21,26,29,30,32,[36][37][38]. In this paper the quantitative analysis of ground changes will be approached by comparing different DTMs.…”

Remote sensing for terrain analysis of linear infrastructure projects

“…Photogrammetric software can be used to generate contour models, digital elevation models (DEMs), topographic base maps and orthophotograph datasets, all of which can be used within a geographical information system (GIS) for terrain analysis. Reviews of the use of aerial photography, GIS and photogrammetrical methods for assessing slope instability are given by Ho et al (2006) and Walstra et al (2007).…”

Using street view imagery for 3-D survey of rock slope failures

“…and its evolution over time by comparing 3-D point clouds acquired at different time steps. For example, 3-D remote sensing techniques are helping to better quantify key aspects of rock slope evolution, including the accurate quantification of rockfall rates and the deformation of rock slopes before failure using both lidar (Rosser et al, 2005;Oppikofer et al, 2009;Royan et al, 2014;Kromer et al, 2015;Fey and Wichmann., 2017) and photogrammetrically derived point clouds (Walstra et al, 2007;Lucieer et al, 2013, Stumpf et al, 2015Fernandes et al, 2016;Guerin et al, 2017;Ruggles et al, 2016).…”