Temat: SRTM - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Porównanie numerycznych modeli terenu SRTM i ASTER GDEM oraz ocena możliwości ich wykorzystania w modelowaniu hydrologicznym w obszarach o małych deniwelacjach
Comparison of Digital Elevation Models SRTM and ASTER GDEM and Evaluation of the Possibility of Their Use in Hydrological Modeling in Areas of Low Drop
Autorzy:: Przybyła, C.
Pyszny, K.
Tematy:: SRTM
ASTER GDEM
małe deniwelacje; Pokaż więcej
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Powiązania:: https://bibliotekanauki.pl/articles/1819084.pdf Link otwiera się w nowym oknie
Opis:: The article compares the accuracy of two digital elevation models Shuttle Radar Topography Mission (SRTM) and Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Global Digital Elevation Model. Models were assessed in the context of possibility of their usage in hydrological modeling in the areas of low drop. The object of analysis is located in the agglomeration of Poznań. Detailed study sites were the catchment area of Junikowski Stream and catchment area of Tributary from Dopiewiec. The study used data from two free DEMs: SRTM, ASTER and as a reference, DEM model generated from the contour lines and elevation points from Vector Map Level 2 (VMAP L2). Analyses were performed using Free Open Source Software, Quantum GIS ver. Wroclaw and GRASS 1.7.4 ver. 6.4.2. Data analysis were also performed in spreadsheets in Microsoft Office Excel 2007. Hydrological analysis were conducted in r.watershed GRASS module. In the second part of the paper, for the comparative analysis, data from Raster Hydrographical Map of Poland was adopted. Research showed that the average difference occurring between the analyzed models are not significant, however, a large number of artifacts in the models can influence on the results of the hydrological analysis. It has been calculated that the SRTM model is more accurate than the ASTER data even though the ASTER model input resolution is higher. The results revealed that the SRTM is closer to the reference model. It should also be noted that used reference DEM, may contain errors. In the small catchments with low drop, catchment boundaries and river networks generated from the DEMs may contain errors affecting the results of the hydrological modeling. Using available and free DEMs (SRTM and ASTER) to generate catchment boundaries and streams networks, the results must be verified basing on field measurements or it has to be made on the basis of greater resolution data, e.g. from Airborne Laser Scanning LIDAR (Light Detection and Ranging). Due to the errors in the tested models it is not recommended to use data, especially from the ASTER, for large-scale studies in the areas of small drop. SRTM and ASTER DEMs, however are a valuable material for analysis in small and medium scales. Data from the analyzed models is a valuable source of information about the terrain and can be successfully used for the geomorphological and landscape analysis.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Assessing the accuracy of SRTM DEM and ASTER GDEM datasets for the coastal zone of shandong province, Eastern China
Autorzy:: Luan, S.
Hou, X.
Wang, Y.
Tematy:: elevation errors
SRTM DEM
ASTER DEM; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/258952.pdf Link otwiera się w nowym oknie
Opis:: This study assessed the performance of recently released 3 arc second SRTM DEM version 4.1 by CSI-CGIAR and 1 arc second ASTER GDEM version 1 and version 2 by METI-NASA in comparison with ground control points from 1:50000 digital line graphs for the coastal zone of Shandong Province, Easter China. The vertical accuracy of SRTM DEM is 13.74 m root mean square error (RMSE), and GDEM version 1 reaches 24.11 m RMSE. Version 2 of ASTER GDEM shows better performance than version 1 and SRTM DEM with a RMSE of 12.12 m. A strong correlation of the magnitude of elevation error with slope and elevation is identified, with lager error magnitudes in the steeper slopes and higher elevations. Taking into account slope and elevation has the potential to considerably improve the accuracy of the SRTM DEM and GDEM version 1 products. However, this improvement for GDEM version 2 can be negligible due to their limited explanatory power for the DEM elevation errors.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Two methods to mitigate insar-based dems vegetation impenetrability bias
Autorzy:: Tulski, Sławomir
Bęcek, Kazimierz
Tematy:: SRTM
vegetation bias
impenetrability
ICESat
GTHM; Pokaż więcej
Wydawca:: Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie
Powiązania:: https://bibliotekanauki.pl/articles/2029253.pdf Link otwiera się w nowym oknie
Opis:: Digital elevation models (DEM), including the Shuttle Radar Topography Mission (SRTM), are used in many branches of geoscience as an ultimate dataset representing our planet’s surface, making it possible to investigate processes that are shaping our world. The SRTM model exhibits elevation bias or systematic error over forests and vegetated areas due to the microwaves’ peculiar properties that penetrate the vegetation layer to a certain depth. Numerous investigations identified that the penetration depth depends on the forest density and height. In this contribution, two methods are proposed to remove the impact of the vegetation impenetrability effect. The first method is founded on the multiple regression of two forest characteristics, namely forest height and forest density. The second method uses a lookup table approach. The lookup table and the multiple regression explanatory variables are taken from the freely available datasets, including the forest density data (MODIS_VCF) and global tree height map (GTHM). An important role in this research is played by the Ice, Clouds, and Land Elevation Satellite (ICESat) data. The accuracy tests indicate that the first method eliminates approximately 68% of the elevation bias, while the second method appears to be more effective, leading to almost complete removal of the vegetation bias from the SRTM data. The methods are fine-tuned to the local coniferous forests in Poland. Additional studies are required to finetune the methods for the leaf-off state of deciduous forests. However, a new set of parameters for both methods can be quickly developed for different locations and forest types. Both methods’ functionality and effectiveness can be improved once more accurate forest tree height and vegetation density data become available. These methods are universal in mitigating the vegetation bias from the Synthetic Aperture Radar Interferometry (InSAR) derived model and photogrammetric models.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Assessment of the vertical accuracy of SRTM-1 data over the territory of Poland using the runway method
Autorzy:: Akgul, V.
Becek, K.
Grossek, J.
Tematy:: SRTM
Runway Method
Polska
DEM accuracy
Polska; Pokaż więcej
Wydawca:: Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie
Powiązania:: https://bibliotekanauki.pl/articles/100342.pdf Link otwiera się w nowym oknie
Opis:: The aim of this project was to estimate the accuracy of the Shuttle Radar Topography Mission (SRTM) digital elevation model over the territory of the Republic of Poland, using the centerline cross-sections of runways as reference data. This method is known as the runway method. The statistical investigations were carried out based on the height differences between the SRTM and the reference data. For this purpose, 22 sections of the SRTM with 1 arcsecond of spatial resolution (SRTM-1″) and profiles of 30 runways were used. Data processing was performed using ArcGIS (Esri) software package. The study found that the SRTM-1″ had a –3.65 m magnitude elevation bias. The standard deviation and root-mean-square error (RMSE) of the elevation differences between the SRTM and the reference data reached the level of 1.88 m and 4.14 m, respectively. The obtained results are consistent with the investigations of the SRTM-3″ model conducted by other authors for the area of Poland and other countries. Overall, it can be confirmed that the SRTM-3″ model performs significantly better over flat areas than the SRTM-1″ in terms of RMSE of the vertical accuracy.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Ocena dokładności modeli wysokości SRTM i ASTER dla wybranych obszarów w Polsce
ESTIMATION DIGITAL ELEVATION MODEL ASTER AND SRTM ACCURACY ON THE SELECTED AREAS OF POLAND
Autorzy:: Moszczyński, Paweł
Opis:: Dokładność numerycznych modeli terenu jest istotna ponieważ dane te są wykorzystywane w wielu dziedzinach życia. Ważne jest, by tak podstawowe informacje jak wysokość nad poziomem morza były wiarygodne oraz jak najdokładniejsze. W pracy odniesiono dwa modele wysokości: ASTER (The Advanced Spaceborne Thermal Emission and Reflection Radiometer Global Digital Elevation Model) oraz SRTM (Shuttle Radar Topography Mission) do danych referencyjnych zebranych z map topograficznych w trzech regionach Polski (Równina Warmińska, Góry Świętokrzyskie, Tatry). Otrzymane wskaźniki błędu porównano i wykazano różnice w dokładności ww. modeli. Średni błąd absolutny modelu SRTM wynosił 3,84 m dla Równiny Warmińskiej, 5,65 m dla Gór Świętokrzyskich oraz 14,69 m dla Tatr, błąd modelu ASTER natomiast 6,89 m dla Równiny Warmińskiej, 8,73 m dla Gór Świętokrzyskich oraz 12,59 m dla Tatr. Wyniki zostały także porównane z dokładnością modeli SRTM i ASTER szacowaną przez producenta. Wykazano, że dokładność modeli dla badanych obszarów jest w dużym stopniu zgodna ze specyfikacją modeli.
The accuracy of digital elevation models is important as the data they provide are commonly used in many applications. It is important that such basic information as the height above sea level is reliable and as accurate as possible. In this thesis I compared two digital surface models: ASTER (The Advanced Spaceborne Thermal Emission and Reflection Radiometer Global Digital Elevation Model) and SRTM (Shuttle Radar Topography Mission) to reference map data collected in three Polish regions (Równina Warmińska, The Świętokrzyskie Mountains and The Tatra Mountains). The error indicators obtained were compared and the differences in the accuracy of the above models were demonstrated. Errors for the SRTM DEM were 3,84 m for Równina Warmińska, 5,65 m for Świętokrzyskie Mountains and 14,69 m for Tatra Mountains, while for the ASTER DEM 6,89 m for Równina Warmińska, 8,73 m for Świętokrzyskie Mountains and 12,59 m for Tatra Mountains. The results were also compared with the accuracy estimated by the producers of the SRTM and ASTER models and they turned out to be similar in this regard.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 6.

Tytuł:: Radiation conditions of Kraków in the aspect of helioenergetics
Warunki radiacyjne Krakowa w aspekcie helioenergetyki
Autorzy:: Zielińska, Katarzyna
Opis:: The aim of the research was to present the spatial differentiation of the radiation conditions of Kraków, as well as to determine favorable and unfavorable places in the aspect of helioenergetics. The digital terrain model developed in two resolutions based on SRTM data and LiDAR data was used to carry out thorough analyzes. SRTM data were used to determine places with the largest and the lowest daily sums of total solar radiation in Krakow, while LiDAR data, characterized by high resolution, served to thoroughly analyze roof slopes in selected parts of the city. Specialized software - ArcGIS was used for the research.
Celem podjętych badań było przedstawienie zróżnicowania przestrzennego warunków radiacyjnych Krakowa, a także wyznaczenie miejsc korzystnych i niekorzystnych w aspekcie helioenergetyki. Do przeprowadzenia dokładnych analiz wykorzystano cyfrowy model terenu opracowany w dwóch rozdzielczościach na podstawie danych SRTM i danych LiDAR. Dane SRTM posłużyły do wyznaczenia miejsc o największych i najmniejszych sumach dobowych całkowitego promieniowania słonecznego w Krakowie, natomiast dane LiDAR, charakteryzujące się wysoką rozdzielczością posłużyły do wnikliwej analizy połaci dachowych w wybranych fragmentach miasta. Do przeprowadzenia badań użyto specjalistycznego oprogramowania- ArcGIS.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 7.

Tytuł:: Assessment of the accuracy of SRTM C- and X-Band high mountain elevation data : a case study of the Polish Tatra Mountains
Autorzy:: Kolecka, Natalia
Kozak, Jacek
Opis:: Global digital elevation models (DEMs) are an invaluable source of information in large area studies. Of particular interest are shuttle radar topography mission (SRTM) data that are freely available for the scientific community worldwide. Prior to any application, global datasets should be evaluated using reference data of higher accuracy. Therefore, the main objective of this study was to assess the accuracy of the SRTM C-band (version 4) DEM and SRTM X-band DEM of mountainous areas located in Poland and to examine the quality of data in relation to topographic parameters, radar beam geometry, initial voids in data and the presence of forest cover. A DEM from the Central National Geodetic and Cartographic Inventory, Poland, served as a reference. The study consisted of three steps: (i) the computation of vertical errors of the SRTM C- and X-band DEMs, (ii) the examination of any systematic bias in the data, and (iii) the analysis of the relationships between the elevation errors and terrain slope, aspect, local incidence angle, occurrence of voids and land cover. We found that the SRTM C- and X-band DEMs have mean errors equal to 4.31 ± 14.09 and 9.03 ± 37.40 m and root mean square errors equal to 14.74 and 38.47 m, respectively. Only 82 \% of the C-band DEM and 74 \% of the X-band DEM vertical errors had absolute values below 16 m. We found that the most important factors determining the occurrence of high errors were the distribution of initial voids and high slope angles for the C-band DEM, and local incidence angle, slope, aspect and radar beam geometry for the X-band DEM. In both cases, the presence of forest cover increased the mean error by approximately 10 m.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

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Skocz do pozycji: 8.

Tytuł:: GIS Based Flooding Analysis Kaluwanchikudy DS Division
Autorzy:: Mathanraj, S.
Kaleel, M. I. M.
Tematy:: Disaster Management
Kaluwanchikudy
SRTM
Severity level
drainage system
flooding; Pokaż więcej
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:: https://bibliotekanauki.pl/articles/1112508.pdf Link otwiera się w nowym oknie
Opis:: The major objective of this study is to identify the flood severity level of the study area using GIS applications. By employing this map, safer habitation zones were established. Direct personal observation and face-to-face interview was done to gather the primary data and Disaster Management center reports, Census reports of Sri Lanka, images and published research reports were used as secondary data. The severity level of flooding in this area was analyzed using SRTM imagery in ArcGIS and overlaid on a Google Earth pro map. The findings of the study established that the highly affected area consisted of around 8.953003 sq·km, the moderately affected area was around 9.190781 sq·km and the lowly affected area was approximately 9.31039 sq·km within the study area. The major causes for flood disaster in this area are the lack of drainage systems in some potential flood regions, the low landscape, poorly maintained drainage systems and the geographical arrangement of the road network. By creating this map, the inhabitants will be aware of danger areas and can relocate accordingly [3, 5-9].
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Dokladność danych radarowych SRTM - teoria i praktyka
Autorzy:: Zieliński, R.
Tematy:: dane radarowe
SRTM
teledetekcja
uprawy
radar data
teledetection
crops; Pokaż więcej
Wydawca:: Stowarzyszenie Geodetów Polskich
Powiązania:: https://bibliotekanauki.pl/articles/130574.pdf Link otwiera się w nowym oknie
Opis:: W referacie przedstawiono próbę oceny przydatności danych radarowych SRTM dla celów kontroli upraw metodą teledetekcyjną poprzez wyznaczenie ich dokładności względnej i bezwzględnej. Analizę dokładności przeprowadzono na 17 obszarach testowych rozmieszczonych na terenie całej Europy. Do porównania wykorzystano dane pochodzące z projektu CwRS 2003. Mimo niejednorodności danych referencyjnych (rożne dokładności i odwzorowania kartograficzne), uzyskano zaskakująco dobre wyniki. Zilustrowano również relacje pomiędzy dokładnością względną danych SRTM a ukształtowaniem terenu.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Numeryczne dane wysokościowe misji TanDEM-X
Digital elevation models of TanDEM-X mission
Autorzy:: Woroszkiewicz, M.
Tematy:: misja TanDEM-X
misja SRTM
interferometria radarowa
numeryczny model pokrycia terenu
TanDEM-X
SRTM
interferometry synthetic aperture radar
digital elevation model (DEM)
digital surface model; Pokaż więcej
Wydawca:: Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Powiązania:: https://bibliotekanauki.pl/articles/210271.pdf Link otwiera się w nowym oknie
Opis:: Zapoczątkowana w 2010 roku misja TanDEM-X (TerraSAR-X add-on for Digital Elevation Measurement) jest pierwszą satelitarną misją radarową, w ramach której zostały pozyskane dane interferometryczne w trybie bistatic InSARstripmap przez dwa bliźniacze satelity TerraSAR-X (TSX) oraz TanDEM-X (TDX) tworzące formację Helix. Realizacja tej konfiguracji ma na celu budowę numerycznego modelu pokrycia terenu (NMPT) o zasięgu globalnym w standardzie HRTI-3 (High Resolution Terrain Information). W artykule przedstawiono opis i specyfikację podstawowych produktów misji, jakimi są m.in. numeryczne modele pokrycia terenu, a także dodatkowych komponentów w postaci warstw informacyjnych i masek. Opisane zostało również zastosowanie techniki interferometrii radarowej w procesie budowy numerycznego modelu pokrycia terenu w postaci cyfrowej.
Started in 2010 TanDEM-X mission (TerraSAR-X add-on for Digital Elevation Measurement) is the first space borne radar interferometer mission that acquires interferometric data in bistatic InSARstripmap mode with two spacecrafts TerraSAR-X (TSX) and TanDEM-X (TDX) flying in Helix formation. That configuration enables generation of a global digital elevation model compatible with the HRTI-3 standard. This paper presents an overview and specification of primary products of the TanDEM-X mission, i.e. digital elevation models and additional components such as information layers and masks. Moreover, the use of radar interferometry techniques for generation of the digital elevation model (DEM) and applications of InSARare discribed.
Dostawca treści:: Biblioteka Nauki

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