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Dissertations / Theses on the topic 'Digital elevation model (DEM)'

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Published: 4 June 2021

Last updated: 25 July 2025

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1

Bring, Hedda. "A Digital Elevation Model of the Lövåsen Esker." Thesis, University of Gävle, Department of Technology and Built Environment, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-234.

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<p>The threats imposed by the ongoing climate change become successively more clear. In the municipality of Sandviken the possible rise in water level in the lake Storsjön might cause major problems. This study aims to produce an elevation model over one of the threatened areas so that the effect of different water levels in the lake can be studied in the future.</p><p>The area of study consists of an esker cutting straight through the lake Storsjön. The area is densely populated and the size is about 13 hectares.</p><p>Measurements were performed, both with GPS, utilizing Network-RTK, and wit

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2

Roy, Bimal Chandra. "Compression of equally spaced digital elevation model (DEM) data /." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487335992902427.

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3

Carlisle, Bruce Hendry. "Digital elevation model quality and uncertainty in DEM-based spatial modelling." Thesis, University of Greenwich, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399349.

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4

Rose, Scott Michael. "The Effect of Digital Elevation Model Resolution on Wave Propagation Predictions at 24Ghz." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/32355.

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Digital Elevation Models (DEMs) are computer-generated representations of the earth's surface. These surfaces can be used to predicted Line-of-Sight (LOS) radio propagation. DEM resolution can affect the results of this prediction. This study examines the effect of DEM resolution on accuracy by comparing varied resolution terrain data for a portion of Blacksburg, Virginia using the prediction of ESRI's ArcViewÂ® viewshed algorithm. Results show that resolutions between one-meter and thirty-meters have little effect on the aggregate accuracy of the viewshed.<br>Master of Science

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5

Smith, Nita Jane. "An ASTER Digital Elevation Model (DEM) for the Darwin-Hatherton Glacial System, Antarctica." Thesis, University of Canterbury. Geography, 2007. http://hdl.handle.net/10092/1480.

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The Darwin-Hatherton glacial system is an outlet glacial system in the Transantarctic Mountains, Antarctica, which drains ice from the East Antarctic Ice Sheet into the Ross Ice Shelf. This research provides remotely sensed data that can be used in modeling research for the Darwin-Hatherton glacial system, which in turn can be used in mass balance research for the West Antarctic Ice Sheet. Two improved digital elevation models (DEM) are produced to cover the lower Darwin Glacier and to cover the upper Darwin and Hatherton Glaciers. The new improved DEMs are generated from Advanced Spaceborne

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6

Wonkovich, Mark A. "Evaluation of High-resolution Digital Elevation Models For Creating Inundation Maps." Bowling Green State University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1167945221.

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7

Spring, Ted. "Uncertainty comparison of Digital Elevation Models derived from different image file formats." Thesis, Högskolan i Gävle, Avdelningen för Industriell utveckling, IT och Samhällsbyggnad, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-17193.

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Unmanned Aerial Systems (UAS) have become increasingly popular recently for surveying and mapping because of their efficiency in acquiring remotely sensed data in a short amount of time and the low cost associated with them. They are used to generate digital elevation models (DEM) derived from aerial photography for various purposes such as the documentation of cultural heritage sites, archaeological surveying or earthwork volume calculations. This thesis investigates the possible effects different file formats may have on the quality of elevation models. In this thesis, an UAS survey was simu

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8

Ranade, Maitreya. "Tree height estimation with TanDEM-X products : Digital Elevation Model (DEM) andForest/ Non-forest (FNF) Map." Thesis, Luleå tekniska universitet, Rymdteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-71216.

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9

Gooch, Michael J. "Accuracy optimisation and error detection in automatically generated elevation models derived using digital photogrammetry." Thesis, Loughborough University, 1999. https://dspace.lboro.ac.uk/2134/7347.

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Users of current Digital Photogrammetric Systems (DPS) can now rapidly generate dense Digital Elevation Models (DEMs) with a minimal amount of training. This procedure is controlled through a set of strategy parameters embedded in the software. Previous research into the effect of these parameters on the resulting DEMs produc'ed mixed results, with some researchers finding that significant changes to the DEM can be made through manipulation of the parameters whilst others suggested that they have little effect. This thesis builds upon this early work to develop two systems that provide assista

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10

Ok, Ali Ozgun. "Accuracy Assessment Of The Dem And Orthoimage Generated From Aster." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606588/index.pdf.

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In this study, DEMs and orthoimages were generated from ASTER imagery and their accuracies were assessed. The study site covers an area of approximately 60 x 60 km and encloses the city of Ankara. First, DEMs were generated from stereo ASTER images. In order to find the best GCP combination, different number of GCPs (8, 16, 24, and 32) was used. The accuracies of the generated DEMs were then assessed based on the check points (CP), slopes and land cover types. It was found that 16 GCPs were good compromise to produce the most accurate DEM. The post processing and blunder removal increa

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Srivastava, Anurag. "Comparison of Two Algorithms for Removing Depressions and Delineating Flow Networks From Grid Digital Elevation Models." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/34268.

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Digital elevation models (DEMs) and their derivatives such as slope, flow direction and flow accumulation maps, are used frequently as inputs to hydrologic and nonpoint source modeling. The depressions which are frequently present in DEMs may represent the actual topography, but are often the result of errors. Creating a depression-free surface is commonly required prior to deriving flow direction, flow accumulation, flow network, and watershed boundary maps. The objectives of this study were: 1) characterize the occurrence of depressions in 30m USGS DEMs and assess correlations to watershe

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12

Bhadra, Sourav. "Assessing the Impacts of Anthropogenic Drainage Structures on Hydrologic Connectivity Using High-Resolution Digital Elevation Models." OpenSIUC, 2019. https://opensiuc.lib.siu.edu/theses/2573.

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Stream flowline delineation from high-resolution digital elevation models (HRDEMs) can be problematic due to the fine representation of terrain features as well as anthropogenic drainage structures (e.g., bridges, culverts) within the grid surface. The anthropogenic drainage structures (ADS) may create digital dams while delineating stream flowlines from HRDEMs. The study assessed the effects of ADS locations, spatial resolution (ranged from 1m to 10m), depression processing methods, and flow direction algorithms (D8, D-Infinity, and MFD-md) on hydrologic connectivity through digital dams usin

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13

Salomon, Guy. "An investigation into the geomorphology of the Hebron Fault, Namibia, using a satellite-derived, high-resolution digital elevation model (DEM)." Master's thesis, Faculty of Science, 2019. https://hdl.handle.net/11427/31710.

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The Hebron fault scarp in southern Namibia is 45 km in length with an average height of 5.5 m and a maximum height of 8.9 m. Namibia is a Stable Continental Region (SCR) — a slowly deforming area within a continental plate. The country also has little recorded seismicity with the largest earthquake on the International Seismological Center (ISC) catalogue being MW 5.4. If the Hebron fault scarp was formed in a single event, this would represent a MW 7.3 earthquake. SCRs do occasionally experience large earthquakes, however, the recurrence intervals between these events is much larger than in r

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14

Walstra, Jan. "Historical aerial photographs and digital photogrammetry for landslide assessment." Thesis, Loughborough University, 2006. https://dspace.lboro.ac.uk/2134/2501.

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This study demonstrates the value of historical aerial photographs as a source for monitoring long-term landslide evolution, which can be unlocked by using appropriate photogrammetric methods. The understanding of landslide mechanisms requires extensive data records; a literature review identified quantitative data on surface movements as a key element for their analysis. It is generally acknowledged that, owing to the flexibility and high degree of automation of modern digital photogrammetric techniques, it is possible to derive detailed quantitative data from aerial photographs. In spite of

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15

Hamré, Moa. "Mapping glacier change in Sweden between the end of ‘Little Ice Age’ and 2008 with orthophotos and a Digital Elevation Model." Thesis, Stockholms universitet, Institutionen för naturgeografi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-176268.

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16

Henrico, Ivan. "Geometric accuracy improvement of VHR satellite imagery during orthorectification with the use of ground control points." Thesis, University of Pretoria, 2016. http://hdl.handle.net/2263/60812.

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Conducting single frame orthorectification on satellite images to create an ortho-image requires four basic components, namely an image, a geometric sensor model, elevation data (for example a digital elevation model (DEM)) and ground control points (GCPs). For this study, orthorectification was executed numerous times (in three stages) and each time components were altered to test the geometric accuracy of the resulting ortho-image. Most notably, the distribution and number of ground control points, the quality of the elevation source and the geometric sensor model or lack thereof were altere

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Thompson, Grant. "Effects of DEM resolution on GIS-based solar radiation model output: A comparison with the National Solar Radiation Database." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1258663688.

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18

Thomas, Joel Spencer. "Volume Change of the Tasman Glacier Using Remote Sensing." Thesis, University of Canterbury. Geography, 2008. http://hdl.handle.net/10092/2406.

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Mountain glaciers are expected to be the greatest contributor to sea level rise over the next century. Glaciers provide a good indicator of global climate and how to monitor their change is an increasingly important issue for climate science and for sea level rise forecasts. However, there has been little direct measurement of glacier volume change in New Zealand. This study explores the use of remotely sensed data for measuring glacier volume change from 1965 to 2006. Digital photogrammetric methods were used to extract topographic data of the Tasman Glacier from aerial photography and ASTER

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19

Rekowsky, Isabel Cristiane. "Variações de área das geleiras da Colômbia e da Venezuela entre 1985 e 2015, com dados de sensoriamento remoto." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/149546.

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Nesse estudo foram mapeadas e mensuradas as variações de área, elevação mínima e orientação das geleiras da Colômbia e da Venezuela (trópicos internos), entre os anos 1985-2015. Para o mapeamento das áreas das geleiras foram utilizadas como base imagens Landsat, sensores TM, ETM+ e OLI. Às imagens selecionadas foi aplicado o Normalized Difference Snow Index (NDSI), no qual são utilizadas duas bandas em que o alvo apresenta comportamento espectral oposto ou com características bem distintas: bandas 2 e 5 dos sensores TM e ETM+ e bandas 3 e 6 do sensor OLI. Os dados de elevação e orientação das

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20

Mukangaliyeva, Saltanat. "Remote Sensing analysis and DEM extraction for geomorphological characterization of Zailiskiy Alatau region (Kazakhstan)." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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The focus of the thesis is to study the potentials and limitations of remote sensing data for landcover mapping and geomorphological characterization at regional scale of a poorly investigated mountain region located in Kazakhstan. For this purpose, various medium resolution satellite products, mainly optical multispectral imagery, and Digital Elevation Models (DEM) were used and processed with different techniques. Overall, the research consists of three main parts. The first part is dedicated to the surface characterization into various classes. This helps to understand what type of area i

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21

Warren, Georgina. "Developing land management units using Geospatial technologies: An agricultural application." Thesis, Curtin University, 2007. http://hdl.handle.net/20.500.11937/740.

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This research develops a methodology for determining farm scale land managementunits (LMUs) using soil sampling data, high resolution digital multi-spectral imagery (DMSI) and a digital elevation model (DEM). The LMUs are zones within a paddock suitable for precision agriculture which are managed according to their productive capabilities. Soil sampling and analysis are crucial in depicting landscape characteristics, but costly. Data based on DMSI and DEM is available cheaply and at high resolution.The design and implementation of a two-stage methodology using a spatiallyweighted multivariate

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22

Bogren, Fredrik. "LIDAR-analys av flygsanddyner i Västerbottens inland : Har dynmorfologi bildad under tidigare interstadialer bevarats i landskapet?" Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-104812.

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The aim of this study was to map the prevalence of aeolian sand dunes in Västerbotten, northern Sweden to find dunes formed during earlier deglaciation phases, which was then preserved in cold-based conditions during the youngest stadial of the Weichselian glaciation. These preserved dunes were expected to be covered by a layer of till and have a rather faint morphology compared to dunes formed during the Holocene. Consequently, high resolution LIDAR-derived images from the Swedish mapping, cadastral and land registration authority (Lantmäteriet) was used to detect the dunes throughout an area

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Warren, Georgina. "Developing land management units using Geospatial technologies: An agricultural application." Curtin University of Technology, Department of Spatial Sciences, 2007. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=17509.

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This research develops a methodology for determining farm scale land managementunits (LMUs) using soil sampling data, high resolution digital multi-spectral imagery (DMSI) and a digital elevation model (DEM). The LMUs are zones within a paddock suitable for precision agriculture which are managed according to their productive capabilities. Soil sampling and analysis are crucial in depicting landscape characteristics, but costly. Data based on DMSI and DEM is available cheaply and at high resolution.The design and implementation of a two-stage methodology using a spatiallyweighted multivariate

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24

Baek, Sang-Ho. "DEM generation and ocean tide modeling over Sulzberger Ice Shelf, West Antarctica, using synthetic aperture radar interferometry." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1155745007.

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25

Ryherd, Julia Kay. "QUANTIFYING THE RATES AND SPATIAL DISTRIBUTION OF RECENT SEDIMENTATION WITHIN THE HYDROLOGICALLY CONNECTED FLOODPLAINS OF THE MIDDLE MISSISSIPPI RIVER, USA, USING DIGITAL ELEVATION MODELS AND DENDROGEOMORPHOLOGY." OpenSIUC, 2017. https://opensiuc.lib.siu.edu/theses/2189.

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The construction of levees along the Mississippi River [MR], beginning in the mid-to-late nineteenth century, have isolated the river along many segments from its floodplain. Sediment from the river is currently deposited in the hydrologically connected floodplain [HCF], the area between the channel margin at low water and the levees. Researchers have studied the amount and rates of sediment deposition along the Upper and Lower Mississippi River segments from the headwaters to Pool 22 and from the Ohio River to the delta; however, no such assessments have been undertaken along the Middle Missi

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Kawata, Leonardo Takei. "Análise de imagens baseada em objetos geográficos (GEOBIA) aplicada ao mapeamento da transição entre cinturão orogênico do atlântico e bacia sedimentar do Paraná." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/8/8135/tde-15072015-140437/.

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O uso de geotecnologias pode contribuir de forma muito significativa para os estudos em geomorfologia. Considerando os principais componentes desta ciência, morfografia, morfometria, morfogênese e morfocronologia, os modelos digitais para a representação da superfície da Terra podem ser amplamente utilizados na aquisição de muitas destas informações. O uso de Modelos Digitais de Elevação (MDE) há alguns anos, já é uma realidade em estudos envolvendo geomorfologia. A sua utilização permite a aquisição de variáveis e parâmetros objetivos que podem servir à definição de critérios para o agrupamen

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Reeves, Robert William. "Image matching in the compressed domain." Thesis, Queensland University of Technology, 1999.

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Gottfridsson, Tom, and Jonatan Hedström. "Kvalitetsundersökning av digital terrängmodellering med handhållen laserskanner i tätbevuxen skog : Granskning av instrumentet ZEB-REVO." Thesis, Högskolan i Gävle, Samhällsbyggnad, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-33304.

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Digitala terrängmodeller (DTM:er) används i samhället för många viktigafunktioner och behöver därför hållas uppdaterade när förändringar sker.Sverige har en nationell höjdmodell (NH) som innehåller höjddata över helalandet. Uppdateringen av NH förlitar sig mestadels på flygburen laserskanning(FLS). Den flygburna laserskanningsmetoden har generellt en högremätosäkerhet i tätbevuxen skog. Vid exploateringar eller framtida planeradeförändringar i skogsområden kan en mer exakt modell behövas. En utvärdering har genomförts av den handhållna laserskannern ZEB-REVO med syfte att bestämma vilken mätos

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Eriksson, Alexander, and James Eklund. "Kvalitetsaspekter vid generering av triangulära nät baserade på punktmoln." Thesis, Högskolan i Gävle, Avdelningen för Industriell utveckling, IT och Samhällsbyggnad, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-21670.

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Light Detection and Ranging (LIDAR) är en teknik för att samla in data om terräng. Genom att använda dessa data kan man skapa olika terrängmodeller. Denna studie syftar till att undersöka hur olika procentuella reduceringar av ursprungsdata påverkar kvalitén hos genererade höjdmodeller i form av Triangular Irregular Network (TIN). Detta görs genom att med hjälp av statistiska metoder göra jämförelser mellan punkter i den genererade TIN modellen och motsvarande punkter i det ursprungliga LIDAR punktmolnet. Studien visar att, beroende på noggrannhetskrav och topografi, en så liten andel som 5 %

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Ullmann, Tobias [Verfasser], Roland [Gutachter] Baumhauer, Stefan [Gutachter] Dech, and Hans-Wolfgang [Gutachter] Hubberten. "Characterization of Arctic Environment by Means of Polarimetric Synthetic Aperture Radar (PolSAR) Data and Digital Elevation Models (DEM) / Tobias Ullmann. Gutachter: Roland Baumhauer ; Stefan Dech ; Hans-Wolfgang Hubberten." Würzburg : Universität Würzburg, 2015. http://d-nb.info/111178387X/34.

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Burgholzer, Robert William. "Using Accumulation Based Network Identification Methods to Identify Hill Slope Scale Drainage Networks in a Raster GIS." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/32001.

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The simple accumulation-based network identification method (ANIM) in a raster Geographic Information System (GIS) posed by Oâ Callaghan and Mark (1984) has been criticized for producing a spatially uniform drainage density (Tarboton 2002) at the watershed scale. This criticism casts doubt on the use of ANIMs for deriving properties such as overland flow length for nonpoint source pollution models, without calibrating the accumulation threshold value. However, the basic assumption that underlies ANIMs is that convergent topography will yield a more rapid accumulation of cells, and thus, mor

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Grumer, Magnus. "Metoder för kartering av bäckar och diken med användning av Nationella höjdmodellen och hydrologisk modellering : En undersökning av olika interpolationsmetoder och upplösningar av digitala höjdmodeller för generering av mindre vattendrag." Thesis, Karlstads universitet, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-68507.

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I detta examensarbete har det undersökts om digitala höjdmodeller, framställda från LIDAR-data som insamlats av Lantmäteriet, kan användas för komplettera och lokalisera nya bäckar och diken som inte finns med i Lantmäteriets databaser idag. I Lantmäteriets verksamhet karteras bäckar och diken först och främst idag med hjälp flygfotografier i stereo. Då metoden fungerar bra på öppen mark kan det vara svårt att urskilja bäckar under tät vegetation som till exempel barrskog. Metoden som använts för att lokalisera bäckar och diken går ut på att beräkna flödesriktningar och flödesackumuleringar i

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33

Saha, Kakoli. "Object-Oriented classification of drumlins from Digital Elevation Models." Kent State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=kent1289558937.

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Joubert, Sarah Joan. "High-resolution climate variable generation for the Western Cape." Thesis, Link to the online version, 2007. http://hdl.handle.net/10019/750.

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Abd, Aziz Samsuzana. "Development of digital elevation models (DEMs) for agricultural applications." [Ames, Iowa : Iowa State University], 2008.

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Gumos, Aleksander Karol. "Modelling the Cross-Country Trafficability with Geographical Information Systems." Thesis, Linköping University, Department of Computer and Information Science, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-313.

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<p>The main objectives of this work were to investigate Geographical Information Systems techniques for modelling a cross-country trafficability. To accomplished stated tasks, reciprocal relationships between the soil deposits, local hydrology, geology and geomorphology were studied in relation to the study area in South-Eastern Sweden.</p><p>Growing awareness of nowadays users of GIS in general is being concentrated on understanding an importance of soil conditions changed after cross-country trafficability. Therefore, in this thesis, constructing of the Soil Knowledge Database introduced to

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Dunn, Shanna K. "Analyzing Spatial Patterns in Reefscape Ecology Via Remote Sensing, Benthic Habitat Mapping, and Morphometrics." NSUWorks, 2009. http://nsuworks.nova.edu/occ_stuetd/234.

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A growing number of scientists are investigating applications of landscape ecology principles to marine studies, yet few coral reef scientists have examined spatial patterns across entire reefscapes with a holistic ecosystem-based view. This study was an effort to better understand reefscape ecology by quantitatively assessing spatial structures and habitat arrangements using remote sensing and geographic information systems (GIS). Quantifying recurring patterns in reef systems has implications for improving the efficiency of mapping efforts and lowering costs associated with collecting field

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Damoiseaux, Thomas. "Untersuchungen zum Einsatz von Flugzeug-InSAR in der Gebirgskartographie." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2003. http://nbn-resolving.de/urn:nbn:de:swb:14-1044618148109-57636.

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The aim of this thesis is to determine to what extent aircraft-borne radar remote sensing can be used as the sole method for making recordings of the surface of the earth as a basis for compiling topographical and relief maps of mountainous areas. This is done using three test areas: the Edelsberg area in the Allgäu Alps and the Silvretta and Verwall Groups in the Central Alps. The basis for discussion is provided by examination of the interaction between the objects to be imaged and the radar signal, the sensor-specific characteristics thereby being taken into account. Following this some dat

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Cosandier, Darren D. "Generating a digital elevation model and orthomosaic from pushbroom imagery." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0022/NQ49790.pdf.

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Miles, Luke G. "Global Digital Elevation Model Accuracy Assessment in the Himalaya, Nepal." TopSCHOLAR®, 2013. http://digitalcommons.wku.edu/theses/1313.

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Digital Elevation Models (DEMs) are digital representations of surface topography or terrain. Collection of DEM data can be done directly through surveying and taking ground control point (GCP) data in the field or indirectly with remote sensing using a variety of techniques. The accuracies of DEM data can be problematic, especially in rugged terrain or when differing data acquisition techniques are combined. For the present study, ground data were taken in various protected areas in the mountainous regions of Nepal. Elevation, slope, and aspect were measured at nearly 2000 locations. These gr

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Pedley, Katherine Louise. "Modelling Submarine Landscape Evolution in Response to Subduction Processes, Northern Hikurangi Margin, New Zealand." Thesis, University of Canterbury. Geological Sciences, 2010. http://hdl.handle.net/10092/4648.

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The steep forearc slope along the northern sector of the obliquely convergent Hikurangi subduction zone is characteristic of non-accretionary and tectonically eroding continental margins, with reduced sediment supply in the trench relative to further south, and the presence of seamount relief on the Hikurangi Plateau. These seamounts influence the subduction process and the structurally-driven geomorphic development of the over-riding margin of the Australian Plate frontal wedge. The Poverty Indentation represents an unusual, especially challenging and therefore exciting location to investiga

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Damoiseaux, Thomas. "Untersuchungen zum Einsatz von Flugzeug-InSAR in der Gebirgskartographie." Doctoral thesis, Technische Universität Dresden, 2002. https://tud.qucosa.de/id/qucosa%3A24199.

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The aim of this thesis is to determine to what extent aircraft-borne radar remote sensing can be used as the sole method for making recordings of the surface of the earth as a basis for compiling topographical and relief maps of mountainous areas. This is done using three test areas: the Edelsberg area in the Allgäu Alps and the Silvretta and Verwall Groups in the Central Alps. The basis for discussion is provided by examination of the interaction between the objects to be imaged and the radar signal, the sensor-specific characteristics thereby being taken into account. Following this some dat

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Miller, Matthew Lowell. "Analysis of Viewshed Accuracy with Variable Resolution LIDAR Digital Surface Models and Photogrammetrically-Derived Digital Elevation Models." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/35692.

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The analysis of visibility between two points on the earthâ s terrain is a common use of GIS software. Most commercial GIS software packages include the ability to generate a viewshed, or a map of terrain surrounding a particular location that would be visible to an observer. Viewsheds are often generated using â bare-earthâ Digital Elevation Models (DEMs) derived from the process of photogrammetry. More detailed models, known as Digital Surface Models (DSMs), are often generated using Light Detection and Ranging (LIDAR) which uses an airborne laser to scan the terrain. In addition to

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Erickson, Harmon Denise Sigrid Christina. "A study of soil-landscape patterns based upon a digital elevation model." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0007/MQ34359.pdf.

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Ayuk, James Ayuk. "Modelling of nonpoint source pollution in the Kuils River Catchment, Western Cape - South Africa." Thesis, University of the Western Cape, 2008. http://hdl.handle.net/11394/3131.

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Donahue, John Patrick. "The extraction of landslides in a satellite image using a digital elevation model." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26695.

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Landslides in the landscape exhibit predictable properties of shape, structure and orientation. These properties are reflected to varying degrees in their depiction in a satellite image. Landslides can be isolated along with similar objects in a digital image using differential and template operators. Extraction of the landslide features from these images can proceed using a logic-based model which draws on an appropriate object definition approximating the depiction of the landslides in an edge-operated image and a digital elevation model. An object extraction algorithm based on these conce

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Syed, Kamran Haider 1962. "The impacts of digital elevation model data type and resolution on hydrologic modeling." Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/288972.

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This dissertation examines the variations in the results of a physically-based kinematic routing rainfall-runoff model (KINEROS2) in response to variations in the geometric model definitions caused by grid size and accuracy of Digital Elevation Model (DEM) data sets. A range of independently acquired DEM data resolutions within the 148 km2 USDA-ARS Walnut Gulch Experimental Watershed provided a sound basis for this analysis. Analysis was conducted over a range of watershed scales and DEM effects were studied in relation to other model parameters. Emphasis was placed on identification of domina

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Bybee, Taylor C. "An Automatic Algorithm for Textured Digital Elevation Model Formation using Aerial Texel Swaths." DigitalCommons@USU, 2016. https://digitalcommons.usu.edu/etd/4593.

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Textured digital elevation models (TDEMs) have valuable use in precision agriculture, situational awareness, and disaster response. However, Scientific-quality models are expensive to obtain using conventional aircraft-based methods. Photogrammetry-based techniques have no direct measurements, and thus has uncertainty in the reconstruction. The concept of a texel camera, which has both aerial imagery and ladar measurements from an inexpensive small UAV, can be used to combine the two methods. A texel camera fuses calibrated ladar measurements and electro-optical imagery upon simultaneous captu

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Wang, Daming Biological Earth &amp Environmental Sciences Faculty of Science UNSW. "Morphometric characteristisaiton of landform from DEMs." Publisher:University of New South Wales. Biological, Earth & Environmental Sciences, 2008. http://handle.unsw.edu.au/1959.4/43326.

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Digital Elevation Models (DEMs) are fundamental datasets for environmental modelling. They provide the basic data from which terrain indices that represent or influence environmental phenomena are derived, for example slope gradient and hydrological contributing area, and also the source from which specific morphometric features are quantified and characterised, for example mountains and drainage basins. This thesis focuses on the latter, with the aim being to develop an algorithm to characterise the landscape in terms of five morphometric features (peaks, passes, pits, ridges and valleys) and

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Do, Hiep-Thuan. "Extensibilité des moyens de traitements pour les données issues des vastes systèmes d'informations géographiques." Phd thesis, Université d'Orléans, 2011. http://tel.archives-ouvertes.fr/tel-00660083.

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Cette thèse s'inscrit dans le cadre de l'évolution des Systèmes d'Informations Géographiques (SIG) et de leur capacité à répondre à des problématiques environnementales qui s'expriment de manière globale et transversale. Dans un contexte ou l'information géographique est en plein essor et où la quantité de données disponible ne cesse de croitre, le besoin en terme d'outil d'aide a la décision n'a jamais été aussi fort. Cette étude s'attache tout particulièrement au cadre de la résolution de problématiques liées à l'eau et l'environnement lorsque les données deviennent trop volumineuses pour êt

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