scholarly journals Digital elevation model of Sitka Harbor and the city of Sitka, Alaska: Procedures, data sources, and quality assessment

2012 ◽  
Author(s):  
P. J. Hickman ◽  
E. N. Suleimani ◽  
D. J. Nicolsky
Keyword(s):  
Quality Assessment ◽  
Digital Elevation Model ◽  
Data Sources ◽  
Digital Elevation ◽  
Elevation Model ◽  
The City

scholarly journals CREATION OF A DIGITAL ELENATION MODEL BY THE METHOD OF RADAR INTERFEROMETRY

2020 ◽  
Vol 2 (5) ◽  
pp. 96-103
Author(s):  
E.N. Nafieva ◽  
◽  
A.V. Grechishchev ◽  
Keyword(s):  
Phase Transformation ◽  
Digital Elevation Model ◽  
Software Package ◽  
Amur Region ◽  
Radar Interferometry ◽  
Image Construction ◽  
Geographic Coordinate System ◽  
Digital Elevation ◽  
Elevation Model ◽  
The City

The article discusses the experience of applying the technique of constructing a digital elevation model (DEM) by the method of radar interferometry using Sentinel-1A / 1B data on the territory of the Amur region near the city of Svobodny in June 2019. The presented method, which consists of 9 main stages, is implemented in the PHOTOMOD Radar software package. The stages of processing include: loading the initial data and converting them into the internal format of the program; creating a project for processing and combining images of an interferometric pair (recalculating the raster of the auxiliary image into the geometry of the main image); construction pictures of interferogram and coherence and it is also possible to calculate pictures of phase and amplitude; filtering the interferogram and phase transformation (recalculation of the obtained values in meters); construction of a digital elevation model and its geocoding into a geographic coordinate system (WGS 84). After that, the results obtained are assessed and compared with the SRTM digital elevation model, namely, a visual comparison of two digital elevation models, their subtraction (SRTM – model obtained from Sentinel-1A / 1B data) and a comparison heights characteristic relief points. Also made conclusions and considered the possibilities of further projects

scholarly journals Evaluation of the Data Quality of Digital Elevation Models in the Context of Inspire / Hodnotenie Kvality Digitálnych Výškových Modelov V Kontexte Inspire

2013 ◽  
Vol 59 (2) ◽  
pp. 9-24 ◽  
Keyword(s):  
Data Quality ◽  
Quality Assessment ◽  
Digital Elevation Model ◽  
Slovak Republic ◽  
Digital Elevation Models ◽  
Geographic Information ◽  
Digital Elevation ◽  
The Family ◽  
Elevation Model

Abstract The contribution deals with the evaluation of the quality of geographic information in accordance with the ISO standards from the family of ISO 19100. The quality assessment was carried out on a sample of the data of the digital elevation model of the Slovak republic - DMR3. The selected data quality elements and sub-elements were evaluated using measures defined in the INSPIRE data specification for Elevation.

STUDY OF THE LANDSLIDE MORPHOLOGY BASED ON GNSS DATA AND AIRBORNE SOUNDING (ON THE EXAMPLE OF A SECTION OF THE PROTVA RIVER VALLEY)

2018 ◽  
Vol 12 (5-6) ◽  
pp. 50-57 ◽  
Author(s):  
I. S. Voskresensky ◽  
A. A. Suchilin ◽  
L. A. Ushakova ◽  
V. M. Shaforostov ◽  
A. L. Entin ◽  
...  
Keyword(s):  
Digital Elevation Model ◽  
Geodetic Network ◽  
Aerial Survey ◽  
River Valley ◽  
Ease Of Use ◽  
Digital Elevation ◽  
Loose Deposits ◽  
Positioning Method ◽  
Landslide Body ◽  
Elevation Model

To use unmanned aerial vehicles (UAVs) for obtaining digital elevation models (DEM) and digital terrain models (DTM) is currently actively practiced in scientific and practical purposes. This technology has many advantages: efficiency, ease of use, and the possibility of application on relatively small area. This allows us to perform qualitative and quantitative studies of the progress of dangerous relief-forming processes and to assess their consequences quickly. In this paper, we describe the process of obtaining a digital elevation model (DEM) of the relief of the slope located on the bank of the Protva River (Satino training site of the Faculty of Geography, Lomonosov Moscow State University). To obtain the digital elevation model, we created a temporary geodetic network. The coordinates of the points were measured by the satellite positioning method using a highprecision mobile complex. The aerial survey was carried out using an unmanned aerial vehicle from a low altitude (about 40–45 m). The processing of survey materials was performed via automatic photogrammetry (Structure-from-Motion method), and the digital elevation model of the landslide surface on the Protva River valley section was created. Remote sensing was supplemented by studying archival materials of aerial photography, as well as field survey conducted immediately after the landslide. The total amount of research results made it possible to establish the causes and character of the landslide process on the study site. According to the geomorphological conditions of formation, the landslide refers to a variety of landslideslides, which are formed when water is saturated with loose deposits. The landslide body was formed with the "collapse" of the blocks of turf and deluvial loams and their "destruction" as they shifted and accumulated at the foot of the slope.

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