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An Assessment Of Lidar Derived Dems
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Book Synopsis An Assessment of LiDAR-derived DEMs by : Niran M. Pradhan
Download or read book An Assessment of LiDAR-derived DEMs written by Niran M. Pradhan and published by . This book was released on 2008 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Uses geographic information systems (GIS) technology to represent the natural terrain of watersheds as digital elevation models (DEMs). Processes light detection and ranging (LiDAR) bare-earth data containing the position (x,y) and the elevation (z) for each point on the surface of the ground to be modeled. Creates different grid size DEMs and compares the associated terrain characteristics.
Book Synopsis Assessment and Correction of Lidar-derived DEMs in the Coastal Marshes of Louisiana by : William Lauve
Download or read book Assessment and Correction of Lidar-derived DEMs in the Coastal Marshes of Louisiana written by William Lauve and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Accuracy Assessment of Lidar Derived Digital Elevation Model (DEM) with Different Slope and Different Canopy Density by : Mohd. Radhie Mohd. Salleh
Download or read book Accuracy Assessment of Lidar Derived Digital Elevation Model (DEM) with Different Slope and Different Canopy Density written by Mohd. Radhie Mohd. Salleh and published by . This book was released on 2014 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Application of LiDAR-derived DEMs and Their By-products for Geomorphic Assessment from Stream-reach to Watershed Scales by : Justin Beau Downing
Download or read book Application of LiDAR-derived DEMs and Their By-products for Geomorphic Assessment from Stream-reach to Watershed Scales written by Justin Beau Downing and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of a LiDAR Derived Digital Elevation Model (DEM) as Input to a METRANS Geographic Information System (GIS) by : Suzanne P. Wechsler
Download or read book Development of a LiDAR Derived Digital Elevation Model (DEM) as Input to a METRANS Geographic Information System (GIS) written by Suzanne P. Wechsler and published by . This book was released on 2011 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: An assessment of digital elevation models (DEMs) derived from LiDAR data for a subset of the Ports of Los Angeles and Long Beach. A methodology based on Monte Carlo simulation was applied to investigate the accuracy of DEMs derived from the LiDAR data using different interpolation methods.
Book Synopsis Realising the Potential of Airborne LiDAR Data in High Quality DEM Generation by : Xiaoye Liu
Download or read book Realising the Potential of Airborne LiDAR Data in High Quality DEM Generation written by Xiaoye Liu and published by . This book was released on 2009 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: Digital elevation models (DEMs) are becoming increasingly important components in national and regional spatial data infrastructure. High-quality DEMs can now be derived directly from airborne light detection and ranging (LiDAR) point-cloud data of high spatial density if the derivation process can be verified. However, LiDAR is relatively new compared with other technologies for terrain data collection, and, although offering the potential for providing better spatial resolution than those that have been routinely available before, will not diffuse among DEM users until the results of meeting the verification challenge are favourable enough to inspire re-organisation of spatial data in decision support for catchment management and other third-tier-of-government authorities. By way of exemplification, the research presented in this thesis concerned ways of improving the processing of the airborne LiDAR data for high-quality DEM generation in terms of both accuracy and efficiency, and explored the applications of LiDAR-derived DEMs in the region of the Corangamite Catchment Management Authority, Victoria, Australia. This thesis begins with a review of the traditional technologies for terrain data collection and DEM generation and compares them with the LiDAR technology. Accordingly, a review of the recently-reported advances in LiDAR data deployment for DEM generation is followed by reports of experiments designed to improve selection and deployment of LiDAR data filtering, modelling methods and data reduction, and the achievement of vertical accuracy for different land covers. Also reported are results of deployment of LiDAR data for ground truthing, and application of LiDAR data for the extraction of drainage networks on an area of deranged drainage: the Victorian Volcanic Plain. The show that: (a) the issues of filtering, modelling techniques, interpolation methods, DEM resolution, and data reduction are critical and must be considered carefully when using LiDAR data for a high-quality DEM generation; (b) it is efficient to use survey marks for the accuracy assessment of LiDAR data. Normal distribution must be tested in order to select a suitable measure for the accuracy assessment of LiDAR data over different land covers; (c) LiDAR data reduction can improve the terrain production efficiency without compromising the product quality. The deployment of breaklines made a significant contribution to improving the accuracy of terrain models while allowing for data reduction; (d) it demonstrated the practical feasibility of applying ground control points from LiDAR intensity image and LiDAR-derived DEM in image orthorectification. The resultant orthoimage accuracy was shown to be superior to that achieved by using (lower accuracy) data sources such as those from Vicmap data; and (e) the LiDAR-derived DEM offers the capability of extracting and delineating the drainage networks in much more detail in low¬relief terrain, including areas in which drainage is barely coherent; The advantages of using LiDAR-derived DEM over the lower-accuracy DEM emerge in terms of stream order, stream number and stream length.
Book Synopsis The Influence of Accuracy, Grid Size, and Interpolation Method on the Hydrological Analysis of LiDAR Derived Dems by : Brian W. Clarkson
Download or read book The Influence of Accuracy, Grid Size, and Interpolation Method on the Hydrological Analysis of LiDAR Derived Dems written by Brian W. Clarkson and published by . This book was released on 2013 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: Light Detection and Ranging (LiDAR) derived Digital Elevation Models (DEMs) provide accurate, high resolution digital surfaces for precise topographic analysis. The following study investigates the accuracy of LiDAR derived DEMs by calculating the Root Mean Square Error (RMSE) of multiple interpolation methods with grid cells ranging from 0. 5 to 10-meters. A raster cell with smaller dimensions will drastically increase the amount of detail represented in the DEM by increasing the number of elevation values across the study area. Increased horizontal resolutions have raised the accuracy of the interpolated surfaces and the contours generated from the digitized landscapes. As the raster grid cells decrease in size, the level of detail of hydrological processes will significantly improve compared to coarser resolutions including the publicly available National Elevation Datasets (NEDs). Utilizing a LiDAR derived DEM with the lowest RMSE as the `ground truth', watershed boundaries were delineated for a sub-basin of the Clear Creek Watershed within the territory of the Seneca Nation of Indians located in Southern Erie County, NY. An investigation of the watershed area and boundary location revealed considerable differences comparing the results of applying different interpretation methods on DEM datasets of different horizontal resolutions. Stream networks coupled with watersheds were used to calculate peak flow values for the 10-meter NEDs and LiDAR derived DEMs.
Book Synopsis LiDAR Remote Sensing and Applications by : Pinliang Dong
Download or read book LiDAR Remote Sensing and Applications written by Pinliang Dong and published by CRC Press. This book was released on 2017-12-12 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ideal for both undergraduate and graduate students in the fields of geography, forestry, ecology, geographic information science, remote sensing, and photogrammetric engineering, LiDAR Remote Sensing and Applications expertly joins LiDAR principles, data processing basics, applications, and hands-on practices in one comprehensive source. The LiDAR data within this book is collected from 27 areas in the United States, Brazil, Canada, Ghana, and Haiti and includes 183 figures created to introduce the concepts, methods, and applications in a clear context. It provides 11 step-by-step projects predominately based on Esri’s ArcGIS software to support seamless integration of LiDAR products and other GIS data. The first six projects are for basic LiDAR data visualization and processing and the other five cover more advanced topics: from mapping gaps in mangrove forests in Everglades National Park, Florida to generating trend surfaces for rock layers in Raplee Ridge, Utah. Features Offers a comprehensive overview of LiDAR technology with numerous applications in geography, forestry and earth science Gives necessary theoretical foundations from all pertinent subject matter areas Uses case studies and best practices to point readers to tools and resources Provides a synthesis of ongoing research in the area of LiDAR remote sensing technology Includes carefully selected illustrations and data from the authors' research projects Before every project in the book, a link is provided for users to download data
Book Synopsis Topographic Laser Ranging and Scanning by : Jie Shan
Download or read book Topographic Laser Ranging and Scanning written by Jie Shan and published by CRC Press. This book was released on 2017-12-19 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt: A systematic, in-depth introduction to theories and principles of Light Detection and Ranging (LiDAR) technology is long overdue, as it is the most important geospatial data acquisition technology to be introduced in recent years. An advanced discussion, this text fills the void. Professionals in fields ranging from geology, geography and geoinformatics to physics, transportation, and law enforcement will benefit from this comprehensive discussion of topographic LiDAR principles, systems, data acquisition, and data processing techniques. The book covers ranging and scanning fundamentals, and broad, contemporary analysis of airborne LiDAR systems, as well as those situated on land and in space. The authors present data collection at the signal level in terms of waveforms and their properties; at the system level with regard to calibration and georeferencing; and at the data level to discuss error budget, quality control, and data organization. They devote the bulk of the book to LiDAR data processing and information extraction and elaborate on recent developments in building extraction and reconstruction, highlighting quality and performance evaluations. There is also extensive discussion of the state-of-the-art technological developments used in: filtering algorithms for digital terrain model generation; strip adjustment of data for registration; co-registration of LiDAR data with imagery; forestry inventory; and surveying. Readers get insight into why LiDAR is the effective tool of choice to collect massive volumes of explicit 3-D data with unprecedented accuracy and simplicity. Compiled by leading experts talking about much of their own pioneering work, this book will give researchers, professionals, and senior students novel ideas to supplement their own experience and practices.
Book Synopsis Measurements from Maps by : D H Maling
Download or read book Measurements from Maps written by D H Maling and published by Butterworth-Heinemann. This book was released on 2016-04-20 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: A classic text and reference work for students, academics and professionals approaching cartometry from a wide range of backgrounds - geography, cartography, forestry and stereology. The author hasd transcended these subject boundaries to produce a definitive and coherent guide to the theory and technique of measuring distance and areas on maps. To increase this book's accessibility, a minimum of mathematical knowledge is assumed.
Author :David Francis Maune Publisher :American Society for Photogrammetry & Remote Sensing ISBN 13 : Total Pages :688 pages Book Rating :4.:/5 (319 download)
Book Synopsis Digital Elevation Model Technologies and Applications by : David Francis Maune
Download or read book Digital Elevation Model Technologies and Applications written by David Francis Maune and published by American Society for Photogrammetry & Remote Sensing. This book was released on 2007 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt: This DE Users Manual is designed to help potential users of digital elevation data understand and articulate their requirements in a way that their expectations are satisfied. if you have a dream that DEM's can help you do a better job, or you need to know more about DEM technologies and applications then this manual is for you.
Download or read book Treatise on Geomorphology written by and published by Academic Press. This book was released on 2013-02-27 with total page 6392 pages. Available in PDF, EPUB and Kindle. Book excerpt: The changing focus and approach of geomorphic research suggests that the time is opportune for a summary of the state of discipline. The number of peer-reviewed papers published in geomorphic journals has grown steadily for more than two decades and, more importantly, the diversity of authors with respect to geographic location and disciplinary background (geography, geology, ecology, civil engineering, computer science, geographic information science, and others) has expanded dramatically. As more good minds are drawn to geomorphology, and the breadth of the peer-reviewed literature grows, an effective summary of contemporary geomorphic knowledge becomes increasingly difficult. The fourteen volumes of this Treatise on Geomorphology will provide an important reference for users from undergraduate students looking for term paper topics, to graduate students starting a literature review for their thesis work, and professionals seeking a concise summary of a particular topic. Information on the historical development of diverse topics within geomorphology provides context for ongoing research; discussion of research strategies, equipment, and field methods, laboratory experiments, and numerical simulations reflect the multiple approaches to understanding Earth’s surfaces; and summaries of outstanding research questions highlight future challenges and suggest productive new avenues for research. Our future ability to adapt to geomorphic changes in the critical zone very much hinges upon how well landform scientists comprehend the dynamics of Earth’s diverse surfaces. This Treatise on Geomorphology provides a useful synthesis of the state of the discipline, as well as highlighting productive research directions, that Educators and students/researchers will find useful. Geomorphology has advanced greatly in the last 10 years to become a very interdisciplinary field. Undergraduate students looking for term paper topics, to graduate students starting a literature review for their thesis work, and professionals seeking a concise summary of a particular topic will find the answers they need in this broad reference work which has been designed and written to accommodate their diverse backgrounds and levels of understanding Editor-in-Chief, Prof. J. F. Shroder of the University of Nebraska at Omaha, is past president of the QG&G section of the Geological Society of America and present Trustee of the GSA Foundation, while being well respected in the geomorphology research community and having won numerous awards in the field. A host of noted international geomorphologists have contributed state-of-the-art chapters to the work. Readers can be guaranteed that every chapter in this extensive work has been critically reviewed for consistency and accuracy by the World expert Volume Editors and by the Editor-in-Chief himself No other reference work exists in the area of Geomorphology that offers the breadth and depth of information contained in this 14-volume masterpiece. From the foundations and history of geomorphology through to geomorphological innovations and computer modelling, and the past and future states of landform science, no "stone" has been left unturned!
Book Synopsis Assessment of Airborne Light Detection and Ranging (LiDAR) for Use in Common Forest Engineering Geomatic Applications by : Michael B. Craven
Download or read book Assessment of Airborne Light Detection and Ranging (LiDAR) for Use in Common Forest Engineering Geomatic Applications written by Michael B. Craven and published by . This book was released on 2011 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: Airborne Light Detection and Ranging (LiDAR) has become a popular remote sensing technology to create digital terrain models and provide forest inventory information. However, little research has been done to investigate the accuracy of using airborne LiDAR to perform measurement tasks common to Forest Engineering. This thesis contains two manuscripts investigating different measurement scenarios. The first manuscript examines the use of airborne LiDAR to measure existing forest roads in support of a road assessment under four different canopy conditions. It was found that along existing centerlines the LiDAR data had a vertical RMSE of 0.28 m and a horizontal RMSE of 1.21 m. Road grades were estimated to within 1% slope of the value measured in the field and horizontal curve radii were estimated with an average absolute error of 3.17 m. The results suggest that airborne LiDAR is an acceptable method to measure forest road grade, but some caution should be used in measuring horizontal curve radii, particularly on sharp curves. The second manuscript compares profile corridor measurements using airborne LiDAR-derived elevations across different forest canopy types and terrain slopes ranging from 37 to 49%. Both LiDAR-derived DEM and raw LiDAR point elevations were compared to field data. The DEM elevations had an average RMSE error of 0.43 m across all canopy types compared to the field data, while the nearest LiDAR point had an average RMSE of 0.49 m compared to the field data. A skyline payload analysis suggested that profiles based on the DEM outperformed profiles based on nearest point elevations by 5% on average when compared to the field measured profiles. Results suggest that a forest engineer should consider using the DEM value rather than the nearest LiDAR point elevation for terrain elevations at discrete locations, particularly when forest canopy occludes locations of interest.
Book Synopsis Laser Scanning Applications in Landslide Assessment by : Biswajeet Pradhan
Download or read book Laser Scanning Applications in Landslide Assessment written by Biswajeet Pradhan and published by Springer. This book was released on 2017-05-04 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is related to various applications of laser scanning in landslide assessment. Landslide detection approaches, susceptibility, hazard, vulnerability assessment and various modeling techniques are presented. Optimization of landslide conditioning parameters and use of heuristic, statistical, data mining approaches, their advantages and their relationship with landslide risk assessment are discussed in detail. The book contains scanning data in tropical forests; its indicators, assessment, modeling and implementation. Additionally, debris flow modeling and analysis including source of debris flow identification and rockfall hazard assessment are also presented.
Book Synopsis Using Digital Elevation Models Derived from Airborne LiDAR and Other Remote Sensing Data to Model Channel Networks and Estimate Fluvial Geomorphological Metrics by : Noah Slovin
Download or read book Using Digital Elevation Models Derived from Airborne LiDAR and Other Remote Sensing Data to Model Channel Networks and Estimate Fluvial Geomorphological Metrics written by Noah Slovin and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent advances in remote-sensing technologies and analysis methods, specifically airborne-LiDAR elevation data and corresponding geographical information system (GIS) tools, present new opportunities for automated and rapid fluvial geomorphic (FGM) assessments that can cover entire watersheds. In this thesis, semi-automated GIS tools are used to extract channel centerlines and bankfull width values from digital elevation models (DEM) for five New England watersheds. For each study site, four centerlines are mapped. LiDAR and NED lines are delineated using ArcGIS spatial analyst tools with high-resolution (1-m to 2-m) LiDAR DEMs or USGS National Elevation Dataset (NED) DEMs, respectively. Resampled LiDAR decreases LiDAR DEM resolution and then runs spatial analyst tools. National Hydrography Dataset (NHD) lines are mapped by the USGS. All mapped lines are compared to centerlines delineated from photography and LiDAR DEMs. Bankfull widths at each site are determined through three methods. Regional regression equations are applied using variables derived from LiDAR and NED DEMs separately, producing two sets of width results. Additionally, the Hydrogeomorphological Geoprocessing Toolset (HGM) is used to extract widths from LiDAR data. Widths are also estimated visually from aerial photos and LiDAR DEMs. Widths measured directly in the field or derived from field-data are used as a baseline for comparison. I find that with a minimal amount of preprocessing, specifically through DEM resampling, LiDAR data can be used to model a channel that is highly correlated with the shape and location of the mapped channel. NED-derived channels model the mapped channel shape with even greater accuracy, and model the channel location only minimally less accurately. No tool used in this study accurately extracted bankfull width values, but analysis of LiDAR data by the HGM toolset did capture details that could not be resolved using regression equations. Overall, I conclude that automated, computerized LiDAR interpretation needs to improve significantly for the expense of data collection to be cost-effective at a watershed scale.
Book Synopsis Observing Geohazards from Space by : Francesca Cigna
Download or read book Observing Geohazards from Space written by Francesca Cigna and published by MDPI. This book was released on 2018-04-09 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Observing Geohazards from Space" that was published in Geosciences
Download or read book Geomorphometry written by Tomislav Hengl and published by Newnes. This book was released on 2008-09-25 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geomorphometry is the science of quantitative land-surface analysis. It draws upon mathematical, statistical, and image-processing techniques to quantify the shape of earth's topography at various spatial scales. The focus of geomorphometry is the calculation of surface-form measures (land-surface parameters) and features (objects), which may be used to improve the mapping and modelling of landforms to assist in the evaluation of soils, vegetation, land use, natural hazards, and other information. This book provides a practical guide to preparing Digital Elevation Models (DEM) for analysis and extracting land-surface parameters and objects from DEMs through a variety of software. It further offers detailed instructions on applying parameters and objects in soil, agricultural, environmental and earth sciences. This is a manual of state-of-the-art methods to serve the various researchers who use geomorphometry.Soil scientists will use this book to further learn the methods for classifying and measuring the chemical, biological, and fertility properties of soils and gain a further understaing of the role of soil as a natural resource. Geologists will find value in the instruction this book provides for measuring the physical features of the soil such as elevation, porosity, and structure which geologists use to predict natural disasters such as earthquakes, volcanoes, and flooding. - Technical details on a variety of software packages allow researchers to solve real-life mapping issues - Provides soil and agronomy researchers best practice techniques for soil data analysis to assist in enhanced land-use and planning - Offers geologists essential tactics for better environmental management by providing a comprehensive analysis of the physical features of soil - Companion website includes access to the latest technological advancements previously unpublished in any other comprehensive source: geomorphometry software, DEM data sources, and applications
