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Author : Pierre Gueudet
Publisher :
ISBN 13 :
Total Pages : 105 pages
Book Rating : 4.:/5 (616 download)
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:
Author : Zhilin Li
Publisher : CRC Press
ISBN 13 : 0203486749
Total Pages : 337 pages
Book Rating : 4.2/5 (34 download)
Download or read book Digital Terrain Modeling written by Zhilin Li and published by CRC Press. This book was released on 2004-11-29 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by experts, Digital Terrain Modeling: Principles and Methodology provides comprehensive coverage of recent developments in the field. The topics include terrain analysis, sampling strategy, acquisition methodology, surface modeling principles, triangulation algorithms, interpolation techniques, on-line and off-line quality control in data a
Author :
Publisher :
ISBN 13 :
Total Pages : 608 pages
Book Rating : 4.:/5 (319 download)
Download or read book Forest Systems written by and published by . This book was released on 2013 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Niran M. Pradhan
Publisher :
ISBN 13 :
Total Pages : 126 pages
Book Rating : 4.:/5 (689 download)
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.
![Download A Comparison Between the Current Statewide DEM [digital Elevation Model] and a DEM Produced Using Lidar Data for Use in Flood Modeling Due to Sea Level Rise PDF Online Free](https://books.google.com/books/content/images/frontcover/AMHbNAAACAAJ?fife=w200-h370)
Author :
Publisher :
ISBN 13 :
Total Pages : 63 pages
Book Rating : 4.:/5 (271 download)
Download or read book A Comparison Between the Current Statewide DEM [digital Elevation Model] and a DEM Produced Using Lidar Data for Use in Flood Modeling Due to Sea Level Rise written by and published by . This book was released on 2005* with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: 'This study investigates and compares the use of two different DEMS for use in coastal flood monitoring and mapping.'
Author :
Publisher :
ISBN 13 :
Total Pages : 57 pages
Book Rating : 4.:/5 (424 download)
Download or read book Point Density Effects on Digital Elevation Models Generated from LiDAR Data written by and published by . This book was released on 2009 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of Airborne LiDAR Systems (ALS) to obtain topographical information of the earth's surface and generate Digital Elevation Models (DEMs) has grown extensively in the field of Remote Sensing. Selected areas of point cloud LiDAR data collected from Honduras in 2008 was used to produce DEMs with varying densities to show the effects of lower resolution LiDAR data. An IDL code was utilized to reduce the selected LiDAR point cloud data to 90%, 66%, 50%, 30%, 10%, 5%, 3%, 1%, 0.5%, 0.3%, 0.1%, 0.05%, 0.03%, and 0.01% of its original density to obtain lower resolution data sets. The software Quick Terrain Modeler (QTM) and its ILAP Bare Earth Extractor Plug-in was used to generate DEMs from the varying point cloud density data sets and the software ENVI was used to perform DEM analysis. It was found that LiDAR point cloud density data set of at least 0.6 points per square meter is necessary to generate an accurate Digital Elevation Model for the test environment.
Author : John P. Wilson
Publisher : John Wiley & Sons
ISBN 13 : 1118938178
Total Pages : 431 pages
Book Rating : 4.1/5 (189 download)
Download or read book Environmental Applications of Digital Terrain Modeling written by John P. Wilson and published by John Wiley & Sons. This book was released on 2018-02-15 with total page 431 pages. Available in PDF, EPUB and Kindle. Book excerpt: A digital elevation model (DEM) is a digital representation of ground surface topography or terrain. It is also widely known as a digital terrain model (DTM). A DEM can be represented as a raster (a grid of squares) or as a vector based triangular irregular network (TIN). DEMs are commonly built using remote sensing techniques, but they may also be built from land surveying. DEMs are used often in geographic information systems, and are the most common basis for digitally-produced relief maps. The terrain surface can be described as compromising of two different elements; random and systematic. The random (stochastic) elements are the continuous surfaces with continuously varying relief. It would take an endless number of points to describe exactly the random terrain shapes, but these can be described in practice with a network of point. It is usual to use a network that creates sloping triangles or regular quadrants. This book examines how the methods and data sources used to generate DEMs and calculate land surface parameters have changed over the past 25 years. The primary goal is to describe the state-of-the-art for a typical digital terrain modeling workflow that starts with data capture, continues with data preprocessing and DEM generation, and concludes with the calculation of one or more primary and secondary land surface parameters. Taken as a whole, this book covers the basic theory behind the methods, the instrumentation, analysis and interpretation that are embedded in the modern digital terrain modeling workflow, the strengths and weaknesses of the various methods that the terrain analyst must choose among, typical applications of the results emanating from these terrain modeling workflows, and future directions. This book is intended for researchers and practitioners who wish to use DEMs, land surface parameters, land surface objects and landforms in environmental projects. The book will also be valuable as a reference text for environmental scientists who are specialists in related fields and wish to integrate these kinds of digital terrain workflows and outputs into their own specialized work environments.
Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309185556
Total Pages : 166 pages
Book Rating : 4.3/5 (91 download)
Download or read book Elevation Data for Floodplain Mapping written by National Research Council and published by National Academies Press. This book was released on 2007-08-16 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Floodplain maps serve as the basis for determining whether homes or buildings require flood insurance under the National Flood Insurance Program run by the Federal Emergency Management Agency (FEMA). Approximately $650 billion in insured assets are now covered under the program. FEMA is modernizing floodplain maps to better serve the program. However, concerns have been raised as to the adequacy of the base map information available to support floodplain map modernization. Elevation Data for Floodplain Mapping shows that there is sufficient two-dimensional base map imagery to meet FEMA's flood map modernization goals, but that the three-dimensional base elevation data that are needed to determine whether a building should have flood insurance are not adequate. This book makes recommendations for a new national digital elevation data collection program to redress the inadequacy. Policy makers; property insurance professionals; federal, local, and state governments; and others concerned with natural disaster prevention and preparedness will find this book of interest.
Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309130573
Total Pages : 136 pages
Book Rating : 4.3/5 (91 download)
Download or read book Mapping the Zone written by National Research Council and published by National Academies Press. This book was released on 2009-06-15 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Federal Emergency Management Agency (FEMA) Flood Insurance Rate Maps portray the height and extent to which flooding is expected to occur, and they form the basis for setting flood insurance premiums and regulating development in the floodplain. As such, they are an important tool for individuals, businesses, communities, and government agencies to understand and deal with flood hazard and flood risk. Improving map accuracy is therefore not an academic question-better maps help everyone. Making and maintaining an accurate flood map is neither simple nor inexpensive. Even after an investment of more than $1 billion to take flood maps into the digital world, only 21 percent of the population has maps that meet or exceed national flood hazard data quality thresholds. Even when floodplains are mapped with high accuracy, land development and natural changes to the landscape or hydrologic systems create the need for continuous map maintenance and updates. Mapping the Zone examines the factors that affect flood map accuracy, assesses the benefits and costs of more accurate flood maps, and recommends ways to improve flood mapping, communication, and management of flood-related data.
Author : David Francis Maune
Publisher : American Society for Photogrammetry & Remote Sensing
ISBN 13 :
Total Pages : 688 pages
Book Rating : 4.:/5 (319 download)
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.
Author : David Francis Maune
Publisher :
ISBN 13 :
Total Pages : 560 pages
Book Rating : 4.F/5 ( download)
Download or read book Digital Elevation Model Technologies and Applications written by David Francis Maune and published by . This book was released on 2001 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Brian W. Clarkson
Publisher :
ISBN 13 :
Total Pages : 70 pages
Book Rating : 4.:/5 (865 download)
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.
Author : Ahmad Fikri Bin Abdullah
Publisher : CRC Press
ISBN 13 : 1000106942
Total Pages : 215 pages
Book Rating : 4.0/5 (1 download)
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).
Author : Suzanne P. Wechsler
Publisher :
ISBN 13 :
Total Pages : 29 pages
Book Rating : 4.:/5 (741 download)
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.
Author : Richard Charrier
Publisher :
ISBN 13 :
Total Pages : 118 pages
Book Rating : 4.:/5 (491 download)
Download or read book Assessing the Resolution Effects of Digital Elevation Models on Automated Floodplain Delineation written by Richard Charrier and published by . This book was released on 2009 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: Automated floodplain modeling commonly requires Digital Elevation Models (DEMs) to represent the topography. As a raster representation of the Earth surface, changing a DEMs resolution (data cell size) has a profound impact on the floodplain delineation. Since 1995 DEM resolution has increased from 100- to 1-meter resolution. This thesis addresses how different DEM resolutions, and different DEM data sources, affect the outcome of modeled floodplain boundaries in the Camp Creek Watershed, a predominately agricultural watershed in Missouri. Two data sets are analyzed: a Light Detection and Ranging (LiDAR) terrain model re-sampled to 1-, 3-, 5-, 10-, 15-, and 30-meter resolutions and existing United States Geological Survey (USGS) 5-, 10-, and 30-meter DEMs. The floodplain delineation process includes hydrologic modeling, hydraulic modeling, and floodplain delineation. Each process includes various input parameters and outputs. Resultant stream networks, watershed boundaries, and floodplains are examined to evaluate the effects of different resolutions. Using 3- or 5- meter LiDAR DEMs produces data that agree with the 1-m data greater than the 90th percentile. The agreement also includes the 10-m DEM data when analyses remove the floodplain modeling cumulative discrepancy effects. Similar trends were not found when using the USGS counterparts; possibly due to the use of the same underlying source material to create the DEMs. When removing the cumulative distortion effect of resolution on the entire modeling process, LiDAR DEM floodplains displayed a 1-4% increase in goodness of fit. Analyzing the results of two separate hydraulic models (HEC-RAS and CARES) finds little difference between their calculated flood surface elevations. Additionally, the thesis analyzes the data storage needs and processing time for modeling different resolutions, finding substantial savings in both as the underlying DEM resolution is decreased. The thesis begins to analyze how models are affected by input variables but many additional studies are needed. Further study of these variables is needed to determine if a single most appropriate model and DEM resolution exists, or what combination of models are appropriate for various types of automated floodplain modeling.
Author : Michael Bishop
Publisher : Springer Science & Business Media
ISBN 13 : 9783540426400
Total Pages : 564 pages
Book Rating : 4.4/5 (264 download)
Download or read book Geographic Information Science and Mountain Geomorphology written by Michael Bishop and published by Springer Science & Business Media. This book was released on 2004-06-30 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the reviews: "Bishop and Schroder (both, Univ. of Nebraska at Omaha) have brought together an impressive group of practitioners in the relatively new application of geographic information science to mountain geomorphology. In doing so, they have produced valuable, first, overall coverage of a high-tech approach to mountain, three-dimensional research. More than 40 contributing authors discuss a wide range of related aspects.... The book is well bound and well produced; each chapter provides an extensive source of references. The numerous line drawings are clearly reproduced, although the mediocre quality of photographic reproduction limits the value of air photographs and satellite images. As is characteristic of many edited collections, there is some variation in chapter quality. Some of the writing is so dense that it requires minute concentration--one chapter, for instance, has 14 pages of references from a total of 43 pages. Nevertheless, this is a vital compendium for a rapidly expanding field of research. Summing Up: Recommended. Upper-division undergraduates through professionals." (J. D. Ives, Choice, March 2005)
Author : V.K. Gupta
Publisher : Springer Science & Business Media
ISBN 13 : 9400946783
Total Pages : 250 pages
Book Rating : 4.4/5 (9 download)
Download or read book Scale Problems in Hydrology written by V.K. Gupta and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: A special workshop on scale problems in hydrology was held at Princeton University, Princeton, New Jersey, during October 31-November 3, 1984. This workshop was the second in a series on this general topic. The proceedings of the first workshop, held in Caracas, Venezuela, in January 1982, appeared in the Journal of Hydrology (Volume 65:1/3, 1983). This book contains the papers presented at the second workshop. The scale problems in hydrology and other geophysical sciences stem from the recognition that the mathematical relationships describing a physical phenomenon are mostly scale dependent in the sense that different relationships manifest at different space-time scales. The broad scientific problem then is to identify and for mulate suitable relationships at the scales of practical interest, test them experimen tally and seek consistent analytical connections between these relationships and those known at other scales. For example, the current hydrologic theories of evaporation, infiltration, subsurface water transport and water sediment transport overland and in channels etc. derive mostly from laboratory experiments and therefore generally apply at "small" space-time scales. A rigorous extrapolation of these theories to large spatial and temporal basin scales, as mandated by practical considerations, appears very difficult. Consequently, analytical formulations of suitable hydrologic theories at basin wide space-time scales and their experimental verification is currently being perceived to be an exciting and challenging area of scientific research in hydrology. In order to successfully meet these challenges in the future, this series of workshops was initiated.
