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Assessment Of Vertical Accuracy From Uav Lidar And Structure From Motion Point Clouds In Floodplain Terrain Mapping
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Book Synopsis Assessment of Vertical Accuracy from UAV-LiDAR and Structure from Motion Point Clouds in Floodplain Terrain Mapping by :
Download or read book Assessment of Vertical Accuracy from UAV-LiDAR and Structure from Motion Point Clouds in Floodplain Terrain Mapping written by and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Remote sensing technologies are being applied to a variety of uses because of the increase in access to various products (digital sensors, UAVs, software) and its ability to model relatively large areas in a short amount of time. While these new technologies are beginning to be adopted, validation of their merit in floodplain terrain mapping is lacking. The main goal of this study is to evaluate the vertical accuracy of digital elevation models (DEMs) generated with UAV-based LiDAR and Structure from Motion (SfM), also known as photographic LiDAR or PhoDAR. Airborne (manned aircraft) LiDAR has been applied to river research in several applications and is common in many fields such as mining, archeology and surveying. SfM has been used to create digital surface models (DSMs) and DEMs of river systems and their associated riparian areas. Given the foundational difference between LiDAR and SfM technologies, the effects of vegetation on the floodplain landscape required a systematic evaluation to determine which techniques are appropriate for floodplain terrain mapping. We collected remotely sensed data from UAV LiDAR and SfM methods at four field sites located within the interior Columbia Basin and analyzed the resulting point clouds and DEMs to determine their vertical accuracy by comparing their elevations with ground surveyed data (checkpoints) throughout the study areas. Both LiDAR and SfM point clouds were filtered and the remaining ground points were compared to surveyed elevations both in their raw form and interpolated DEMs to assess their vertical accuracy. The results show that in vegetated ground cover, LiDAR point clouds were able to produce higher accuracy returns and a resulting higher accuracy DEM than SfM results. In non-vegetated areas, the accuracies between SfM and LiDAR returns are closer but still show higher accuracy from LiDAR point clouds. Ground filtering is shown to be a limitation on DEM vertical accuracy because of the inclusion of non-ground points in the filtering process. This limitation impacts the vertical accuracy of both LiDAR and SfM interpolated DEMs in floodplain habitats.
Book Synopsis General Classification Handbook for Floodplain Vegetation in Large River Systems by : Jennifer J. Dieck
Download or read book General Classification Handbook for Floodplain Vegetation in Large River Systems written by Jennifer J. Dieck and published by . This book was released on 2004 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis UAV Photogrammetry and Remote Sensing by : Fernando Carvajal-Ramírez
Download or read book UAV Photogrammetry and Remote Sensing written by Fernando Carvajal-Ramírez and published by MDPI. This book was released on 2021-09-06 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt: The concept of remote sensing as a way of capturing information from an object without making contact with it has, until recently, been exclusively focused on the use of Earth observation satellites. The emergence of unmanned aerial vehicles (UAV) with Global Navigation Satellite System (GNSS) controlled navigation and sensor-carrying capabilities has increased the number of publications related to new remote sensing from much closer distances. Previous knowledge about the behavior of the Earth's surface under the incidence different wavelengths of energy has been successfully applied to a large amount of data recorded from UAVs, thereby increasing the special and temporal resolution of the products obtained. More specifically, the ability of UAVs to be positioned in the air at pre-programmed coordinate points; to track flight paths; and in any case, to record the coordinates of the sensor position at the time of the shot and at the pitch, yaw, and roll angles have opened an interesting field of applications for low-altitude aerial photogrammetry, known as UAV photogrammetry. In addition, photogrammetric data processing has been improved thanks to the combination of new algorithms, e.g., structure from motion (SfM), which solves the collinearity equations without the need for any control point, producing a cloud of points referenced to an arbitrary coordinate system and a full camera calibration, and the multi-view stereopsis (MVS) algorithm, which applies an expanding procedure of sparse set of matched keypoints in order to obtain a dense point cloud. The set of technical advances described above allows for geometric modeling of terrain surfaces with high accuracy, minimizing the need for topographic campaigns for georeferencing of such products. This Special Issue aims to compile some applications realized thanks to the synergies established between new remote sensing from close distances and UAV photogrammetry.
Book Synopsis UAV Photogrammetry of Forests as a Vulnerable Process by : Julian Frey
Download or read book UAV Photogrammetry of Forests as a Vulnerable Process written by Julian Frey and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Point Cloud Technologies for Geomorphologists by : Christopher Gomez
Download or read book Point Cloud Technologies for Geomorphologists written by Christopher Gomez and published by Springer Nature. This book was released on 2022-09-22 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: Starting from concrete examples in Geomorphology, this comprehensive textbook explains to graduate and postgraduate students, point-cloud data technology and associated methods from acquisition to final-product generation. In the last few decades, Geo-sciences have experienced a paradigm shift from the challenge of collecting enough data to the need of creating new processing tools that can handle the billions of data. This shift has come to Geomorphology with the increasing use of surface-pointclouds obtained from photogrammetry, laser scanners and processed by specialist software, and it is thus necessary for the next generation of geomorphologist to be fluent in these technologies. Consequently, this book explains from concrete examples how to use pointcloud technologies, from data collection to processing and final product generation. The philosophy of this book relies on two principles, first: you do not have to be a tech-wizard to use pointcloud technologies, allowing the you to bring back the focus on your science; second pointcloud methods can be affordable, therefore the book provide a set of worked-examples in the different geomorphological environments using open source software and R and Python code samples. The book can be used as a textbook in a geomorphology, geology, physical geography, Sabo-sciences and engineering class, as well as a companion for the more seasoned scientist who wants to solve specific problems.
Book Synopsis Gravel Bed Rivers by : Michael Church
Download or read book Gravel Bed Rivers written by Michael Church and published by John Wiley & Sons. This book was released on 2012-02-10 with total page 605 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gravel-Bed Rivers: Processes, Tools, Environments presents a definitive review of current knowledge of gravel-bed rivers, derived from the 7th International Gravel-bed Rivers Workshop, the 5-yearly meeting of the world’s leading authorities in the field. Each chapter in the book has been specifically commissioned to represent areas in which recent progress has been made in the field. The topics covered also represent a coherent progression through the principal areas of the subject (hydraulics; sediment transport; river morphology; tools and methods; applications of science). Definitive review of the current knowledge of gravel-bed rivers Coverage of both fundamental and applied topics Edited by leading academics with contributions from key researchers Thoroughly edited for quality and consistency to provide coherent and logical progression through the principal areas of the subject.
Book Synopsis Roughness Characteristics of Natural Channels by : Harry Hawthorne Barnes
Download or read book Roughness Characteristics of Natural Channels written by Harry Hawthorne Barnes and published by . This book was released on 1967 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Color photographs and descriptive data for 50 stream channels for which roughness coefficients have been determined.
Book Synopsis A Methodology for Processing Raw LIDAR Data to Support Urban Flood Modelling Framework by : Ahmad Fikri Bin Abdullah
Download or read book A Methodology for Processing Raw LIDAR Data to Support Urban Flood Modelling Framework written by Ahmad Fikri Bin Abdullah and published by CRC Press. This book was released on 2020-10-28 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt: The consequences of recent floods and flash floods in many parts of the world have been devastating. One way to improving flood management practice is to invest in data collection and modelling activities which enable an understanding of the functioning of a system and the selection of optimal mitigation measures. A Digital Terrain Model (DTM) provides the most essential information for flood managers. Light Detection and Ranging (LiDAR) surveys which enable the capture of spot heights at a spacing of 0.5m to 5m with a horizontal accuracy of 0.3m and a vertical accuracy of 0.15m can be used to develop high accuracy DTM but needs careful processing before using it for any application.This book presents the augmentation of an existing Progressive Morphological filtering algorithm for processing raw LiDAR data to support a 1D/2D urban flood modelling framework. The key characteristics of this improved algorithm are: (1) the ability to deal with different kinds of buildings; (2) the ability to detect elevated road/rail lines and represent them in accordance to the reality; (3) the ability to deal with bridges and riverbanks; and (4) the ability to recover curbs and the use of appropriated roughness coefficient of Manning‘s value to represent close-to-earth vegetation (e.g. grass and small bush).
Book Synopsis Structure from Motion in the Geosciences by : Jonathan L. Carrivick
Download or read book Structure from Motion in the Geosciences written by Jonathan L. Carrivick and published by John Wiley & Sons. This book was released on 2016-07-15 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structure from Motion with Multi View Stereo provides hyperscale landform models using images acquired from standard compact cameras and a network of ground control points. The technique is not limited in temporal frequency and can provide point cloud data comparable in density and accuracy to those generated by terrestrial and airborne laser scanning at a fraction of the cost. It therefore offers exciting opportunities to characterise surface topography in unprecedented detail and, with multi-temporal data, to detect elevation, position and volumetric changes that are symptomatic of earth surface processes. This book firstly places Structure from Motion in the context of other digital surveying methods and details the Structure from Motion workflow including available software packages and assessments of uncertainty and accuracy. It then critically reviews current usage of Structure from Motion in the geosciences, provides a synthesis of recent validation studies and looks to the future by highlighting opportunities arising from developments in allied disciplines. This book will appeal to academics, students and industry professionals because it balances technical knowledge of the Structure from Motion workflow with practical guidelines for image acquisition, image processing and data quality assessment and includes case studies that have been contributed by experts from around the world.
Book Synopsis The Influence of Post-spacing Density of DEMS Derived from LIDAR on Flood Modeling by : Pierre Gueudet
Download or read book The Influence of Post-spacing Density of DEMS Derived from LIDAR on Flood Modeling written by Pierre Gueudet and published by . This book was released on 2004 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Comparative Analysis of LiDAR and Structure from Motion Photogrammetry Utilizing a Small Unmanned Aerial System (sUAS) Approach for Structural Mapping and Inspection by : Jonathan L. Boone
Download or read book A Comparative Analysis of LiDAR and Structure from Motion Photogrammetry Utilizing a Small Unmanned Aerial System (sUAS) Approach for Structural Mapping and Inspection written by Jonathan L. Boone and published by . This book was released on 2018 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geology and Geomorphology of Holocene Coastal Barriers of Brazil by : Sérgio R. Dillenburg
Download or read book Geology and Geomorphology of Holocene Coastal Barriers of Brazil written by Sérgio R. Dillenburg and published by Springer Science & Business Media. This book was released on 2008-11-20 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first book to cover the Holocene geology and geomorphology of the 9,200 kilometers of the Brazilian coast. It is written for third and fourth year undergraduates, post-graduate students, scientists and man- ers. It characterizes the Brazilian coast in terms of the Holocene geology, geomorphology, oceanographic and climatic conditions, and the location, morphology and evolution of the barrier types. Separate chapters outline the types of barriers and coastal dynamics in each state, beginning in the south and proceeding to the north. Some emphasis is placed on the stretches of coast where the detailed morphology and stratigraphy of b- riers has been previously determined. To date, the Brazilian coastal barriers have been largely ignored by the international community, partly perhaps because much of the past research has tended to concentrate on barrier islands, of which there are very few in Brazil. In contrast, the Brazilian coastal barriers display a much wider range of types than is generally assumed. The biggest and most spectacular transgressive dunefield barriers in the world exist in Brazil, and dominate the southern and northeastern coasts. Many have never been described - fore. This volume provides a wealth of information on Holocene barrier types, evolution and dynamics. It provides managers, ecologists, biologists and botanists with much needed information on the geology, geomorph- ogy and dynamics of the genesis, types, functioning and ecosystems of the Holocene barriers extending along the entire Brazilian coast.
Book Synopsis UAV Photogrammetry and Remote Sensing by : Fernando Carvajal-Ramírez
Download or read book UAV Photogrammetry and Remote Sensing written by Fernando Carvajal-Ramírez and published by . This book was released on 2021 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt: The concept of remote sensing as a way of capturing information from an object without making contact with it has, until recently, been exclusively focused on the use of Earth observation satellites.The emergence of unmanned aerial vehicles (UAV) with Global Navigation Satellite System (GNSS) controlled navigation and sensor-carrying capabilities has increased the number of publications related to new remote sensing from much closer distances. Previous knowledge about the behavior of the Earth's surface under the incidence different wavelengths of energy has been successfully applied to a large amount of data recorded from UAVs, thereby increasing the special and temporal resolution of the products obtained.More specifically, the ability of UAVs to be positioned in the air at pre-programmed coordinate points; to track flight paths; and in any case, to record the coordinates of the sensor position at the time of the shot and at the pitch, yaw, and roll angles have opened an interesting field of applications for low-altitude aerial photogrammetry, known as UAV photogrammetry. In addition, photogrammetric data processing has been improved thanks to the combination of new algorithms, e.g., structure from motion (SfM), which solves the collinearity equations without the need for any control point, producing a cloud of points referenced to an arbitrary coordinate system and a full camera calibration, and the multi-view stereopsis (MVS) algorithm, which applies an expanding procedure of sparse set of matched keypoints in order to obtain a dense point cloud. The set of technical advances described above allows for geometric modeling of terrain surfaces with high accuracy, minimizing the need for topographic campaigns for georeferencing of such products.This Special Issue aims to compile some applications realized thanks to the synergies established between new remote sensing from close distances and UAV photogrammetry.
Book Synopsis Unmanned Aerial Vehicle Based Structure from Motion Biomass Inventory Estimates by :
Download or read book Unmanned Aerial Vehicle Based Structure from Motion Biomass Inventory Estimates written by and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Riparian vegetation restoration efforts demand cost effective, accurate, and replicable impact assessments. In this thesis a method is presented using an Unmanned Aerial Vehicle (UAV) equipped with a GoPro digital camera to collect photogrammetric data of a 2.02-acre riparian restoration. A three-dimensional point cloud was created from the photos using Structure from Motion (SfM) techniques. The point cloud was analyzed and compared to traditional, ground-based monitoring techniques. Ground truth data collected using the status-quo approach was collected on 6.3% of the study site and averaged across the entire site to report stem heights in stems/acre in three height classes, 0-3 feet, 3-7 feet, and greater than 7 feet. The project site was divided into four analysis sections, one for derivation of parameters used in the UAV data analysis, and the remaining three sections reserved for method validation. The most conservative of several methods tested comparing the ground truth data to the UAV generated data produced an overall error of 21.6% and indicated an r2 value of 0.98. A Bland Altman analysis indicated a 99% probability that the UAV stems/plot result will be within 159 stems/plot of the ground truth data. The ground truth data is reported with an 80% confidence interval of +/- 844 stems/plot, thus the UAV was able to estimate stems well within this confidence interval. Further research is required to validate this method longitudinally at this same site and across varying ecologies. These results suggest that UAV derived environmental impact assessments at riparian restoration sites may offer competitive performance and value.
Book Synopsis Rivers in the Landscape by : Ellen Wohl
Download or read book Rivers in the Landscape written by Ellen Wohl and published by John Wiley & Sons. This book was released on 2014-03-07 with total page 585 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rivers in the Landscape: Science and Management offers a comprehensive and accessible overview of the current state of knowledge for river process and form, taking a holistic approach to the subject with coverage of integrated river science and management in practice. The processes and forms present in channelized surface flow–rivers–are systematically explored in this book to • emphasize the connectivity between rivers and the greater landscape by explicitly considering the interactions between rivers and tectonics, climate, biota, and human activities; • provide a concise summary of the current state of knowledge for physical process and form in rivers; • reflect the diversity of river environments, from mountainous, headwater channels to large, lowland, floodplain rivers and from the arctic to the tropics; • reflect the diverse methods that scientists use to characterize and understand river process and form, including remote sensing, field measurements, physical experiments, and numerical simulations; • reflect the increasing emphasis on quantification in fluvial geomorphology and the study of Earth surfaces in general; • provide both an introduction to the classic, foundational papers on each topic, and a guide to the latest, particularly insightful and integrative references. Aimed at advanced undergraduate students, graduate students, and professionals looking for a concise summary of physical aspects of rivers, this book emphasizes general principles and conceptual models, as well as concrete examples of each topic drawn from the extensive literature on river process and form.
Book Synopsis Drones for Biodiversity Conservation and Ecological Monitoring by : Ricardo Díaz-Delgado
Download or read book Drones for Biodiversity Conservation and Ecological Monitoring written by Ricardo Díaz-Delgado and published by MDPI. This book was released on 2019-12-18 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unmanned aerial vehicles (UAV) have already become an affordable and cost-efficient tool to quickly map a targeted area for many emerging applications in the arena of ecological monitoring and biodiversity conservation. Managers, owners, companies, and scientists are using professional drones equipped with high-resolution visible, multispectral, or thermal cameras to assess the state of ecosystems, the effect of disturbances, or the dynamics and changes within biological communities inter alia. We are now at a tipping point on the use of drones for these type of applications over natural areas. UAV missions are increasing but most of them are testing applicability. It is time now to move to frequent revisiting missions, aiding in the retrieval of important biophysical parameters in ecosystems or mapping species distributions. This Special Issue shows UAV applications contributing to a better understanding of biodiversity and ecosystem status, threats, changes, and trends. It documents the enhancement of knowledge in ecological integrity parameters mapping, long-term ecological monitoring based on drones, mapping of alien species spread and distribution, upscaling ecological variables from drone to satellite images: methods and approaches, rapid risk and disturbance assessment using drones, mapping albedo with UAVs, wildlife tracking, bird colony and chimpanzee nest mapping, habitat mapping and monitoring, and a review on drones for conservation in protected areas.
Book Synopsis An Evaluation of Unmanned Aerial Systems and Structure-from-motion for Fluvial Large Wood Sensing and Risk Assessment by : Daniel Gerke
Download or read book An Evaluation of Unmanned Aerial Systems and Structure-from-motion for Fluvial Large Wood Sensing and Risk Assessment written by Daniel Gerke and published by . This book was released on 2019 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research aims to show Unmanned Aerial System (UAS) and Structure-from-Motion (SfM) technology can, in combination, improve on traditional large wood (LW) monitoring techniques. More temporally and economically efficient data collected at a finer spatial resolution and greater spatial extent will increase the effectiveness of management plans and risk assessment for LW by providing decision-makers with a complete picture of the river. Contemporary practices are too inefficient in time and labor for large-scale monitoring of fluvial LW with anything more than the most general management or risk assessment in mind. The paradigm of river research, the river continuum concept (RCC), where a river's traits are interpolated between discrete study areas, has shifted to a nested hierarchical structure (Woodget et al., 2017). The nested hierarchical structure paradigm demands higher temporal and spatial resolution combined with greater spatial extent for LW data, as called for in Zorn et al. (2018). This study revealed UAS-SfM as a plausible option for creating data products capable of enhancing LW monitoring and risk assessment. Orthomosaics of a higher resolution (2.34cm/pixel) than those available via commercially available imagery and a 3D point cloud were both useful for general identification of LW, but both were subject to noise and errors. The sources of the noise and errors were the camera angles used during image collection, overhanging vegetation, and deep water. Changes to data collection techniques can alleviate these issues.
