Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/40185
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dc.contributor.authorBlundell, S. Bruce.-
dc.date.accessioned2021-04-01T18:35:14Z-
dc.date.available2021-04-01T18:35:14Z-
dc.date.issued2021-03-
dc.identifier.govdocERDC/GRL TR-21-2-
dc.identifier.urihttps://hdl.handle.net/11681/40185-
dc.identifier.urihttp://dx.doi.org/10.21079/11681/40185-
dc.descriptionTechnical Report-
dc.description.abstractElevation models derived from high-resolution airborne lidar scanners provide an added dimension for identification and extraction of micro-terrain features characterized by topographic discontinuities or breaklines. Gridded digital surface models created from first-return lidar pulses are often combined with lidar-derived bare-earth models to extract vegetation features by model differencing. However, vegetative canopy can also be extracted from the digital surface model alone through breakline analysis by taking advantage of the fine-scale changes in slope that are detectable in high-resolution elevation models of canopy. The identification and mapping of canopy cover and micro-terrain features in areas of sparse vegetation is demonstrated with an elevation model for a region of western Montana, using algorithms for breaklines, elevation differencing, slope, terrain ruggedness, and breakline gradient direction. These algorithms were created at the U.S. Army Engineer Research Center – Geospatial Research Laboratory (ERDC-GRL) and can be accessed through an in-house tool constructed in the ENVI/IDL environment. After breakline processing, products from these algorithms are brought into a Geographic Information System as analytical layers and applied to a mobility routing model, demonstrating the effect of breaklines as obstacles in the calculation of optimal, off-road routes. Elevation model breakline analysis can serve as significant added value to micro-terrain feature and canopy mapping, obstacle identification, and route planning.en_US
dc.description.sponsorshipUnited States. Army. Corps of Engineers.en_US
dc.description.tableofcontentsAbstract ................................................................................................................................................... ii Figures and Tables ................................................................................................................................. iv Preface ..................................................................................................................................................... v 1 Introduction ..................................................................................................................................... 1 1.1 Background ..................................................................................................................... 1 1.2 Overview .......................................................................................................................... 4 1.3 Objectives ........................................................................................................................ 6 2 Algorithm Development ................................................................................................................. 8 2.1 Breakline algorithm ........................................................................................................ 8 2.1.1 Breakline computation strategy........................................................................................ 11 2.1.2 Application to lidar-derived DSM ...................................................................................... 15 2.2 Elevation difference algorithm ..................................................................................... 18 2.3 Slope algorithm ............................................................................................................. 20 2.4 Ruggedness algorithm .................................................................................................. 22 2.5 Breakline gradient direction algorithm ........................................................................ 24 3 Off-Road Mobility Modeling with Breakline-Derived Micro-Terrain Features ........................ 29 3.1 Mobility model set-up ................................................................................................... 29 3.2 Route-finding results and discussion .......................................................................... 31 4 Summary and Conclusions .......................................................................................................... 34 References ............................................................................................................................................ 36 Acronyms and Abbreviations .............................................................................................................. 38 Report Documentation Page-
dc.format.extent48 pages / 7.34 MB-
dc.language.isoen_USen_US
dc.publisherGeospatial Research Laboratory (U.S.)en_US
dc.publisherEngineer Research and Development Center (U.S.)-
dc.relation.ispartofseriesTechnical Report (Engineer Research and Development Center (U.S.)) ; no. ERDC/GRL TR-21-2-
dc.rightsApproved for Public Release; Distribution is Unlimited-
dc.sourceThis Digital Resource was created in Microsoft Word and Adobe Acrobat-
dc.subjectDigital elevation modelen_US
dc.subjectDigital terrain modelen_US
dc.subjectBreaklineen_US
dc.subjectMobility modelen_US
dc.titleMicro-terrain and canopy feature extraction by breakline and differencing analysis of gridded elevation models : identifying terrain model discontinuities with application to off-road mobility modelingen_US
dc.typeReporten_US
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