Comparison of Aster and SRTM Digital Elevation Models at One-Arc-Second Resolution Over Turkey

Bildirici, İbrahim Öztuğ; Abbak, Ramazan Alpay

doi:10.15317/scitech.2017.66

Cited by 5 publications

(2 citation statements)

References 5 publications

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“…Several studies are carried out about the accuracy of SRTM-1 and ASTER GDEM. Bildirici et al, (2017) compared SRTM and ASTER GDEM with the DEM produced from 1:25K Turkish standard topographic maps. They found that SRTM-1 gives better accuracies according to ASTER GDEM on test areas.…”

Section: Countrywide Dem Production Applications In Different Countriesmentioning

confidence: 99%

Designing high resolution countrywide DEM for Turkey

Yılmaz¹,

Erdoğan²

2018

International Journal of Engineering and Geosciences

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Digital Elevation Models (DEM) are widely used in many different applications such as orthophoto production, 3D city models, hydrological modeling, visibility, flood, flood analysis and etc. The densest grid spacing DEM covering Turkey is the DTED-2 data produced by the General Command of Mapping with a grid spacing of 1 second (approximately 30 m). Denser and more accurate DEM is produced by several institutions in only required areas but not covering whole country. Governmental institutions need denser, more accurate, homogeneous and countrywide DEM. This study is conducted to meet DEM demands with optimum accuracy and density by stereo aerial photos. In order to investigate the optimal resolution for a countrywide DEM, test DEMs are produced in three different areas representing the general topographic structure of Turkey by using 45 cm ground sampling distance stereo aerial photos. The Root Mean Square Error (RMSE) of the heights of three areas are respectively ± 2.51 m, ± 1.38 m and ± 1.30 m. The proposed grid spacing by INSPIRE with these accuracies is 3-30 m in flat terrain and 3-15 m in mountainous terrain. It is concluded that 5 m grid spacing will be suitable for a countrywide DEM with the above mentioned accuracies. It is also proposed that production format of DEM should be 32 Bit Floating GeoTiff.

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Section: Countrywide Dem Production Applications In Different Countriesmentioning

confidence: 99%

Designing high resolution countrywide DEM for Turkey

Yılmaz¹,

Erdoğan²

2018

International Journal of Engineering and Geosciences

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“…Its coverage spans from 83°N to 83°S latitude, encompassing 99% of Earth's land area. ASTER GDEM is available in geo-tiff format by 1°×1° tiles at one arc-second resolution(Bildirici and Abbak, 2017). The vertical and horizontal datum of the ASTER is EGM96 and WGS84, respectively.The SRTM project was jointly realized by NASA, the National Imagery and Mapping Agency (NIMA), the German Space Agency (DLR), and the Italian Space Agency (ASI).…”

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confidence: 99%

Morphometric Analysis of Saz-Çayırova Drainage Basin using Geographic Information Systems and Different Digital Elevation Models

KILIÇ

Gülgen

ÇELEN

et al. 2022

International Journal of Environment and Geoinformatics

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Drainage basin/watershed analysis based on morphometric parameters has an essential role in watershed management and planning. Reliable delineation of watersheds and drainage networks is critical for hydrological and geomorphological studies. Since access to high-resolution digital elevation models (DEMs) and digital surface models (DSMs) is costly, many researchers need to evaluate low-resolution open-source products. Several data sources produced from different surveying techniques are used in the morphometric analysis. In this study, five different datasets such as Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) GDEM, Shuttle Radar Topography Mission (SRTM) DEM, Advanced Land Observing Satellite (ALOS) DSM, National Aeronautics and Space Administration (NASA) DEM, and a DEM from topographic maps (TOPO DEM), were investigated based on morphometric parameters. The tests was carried out in the Saz-Çayırova Basin, which is one of the critical urbanization and industrialization regions of Kocaeli, Turkey. In this study, the TOPO DEM, whose horizontal resolution is 30 m, was produced from 1:25K scaled digitized topographical maps. It was used for comparative analysis, as in all DEMs sources. The morphometric parameters' result of the TOPO DEM was used as the reference data for comparing the results of the other DEMs sources. In addition, the mean absolute percentage error (MAPE) was used to compute the accuracy between the freely available DEMs and the TOPO DEM for each morphometric parameter. The outcomes of this study reveal that the most consistent results with the TOPO DEM are provided by SRTM DEM, following the NASA DEM.

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Determination of landslide susceptibility in linear infrastructure. Case: aqueduct network in Palacé, Popayan (Colombia)

Muñoz

Castro

2017

ing.inv.

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This research aimed to predict the occurrence of mass movements in the aqueduct network of Palacé, in the municipality of Popayan (Colombia). We evaluated the quality of SRTM and ASTER digital terrain models by comparing them with contour lines using a map scale of 1: 25000. The landscape parameters derived from the SRTM-DEM were analyzed with a multivariate procedure using algorithms implemented in free software, along with thematic information of the study area (coverage, distance to faults, rivers and precipitation). We selected non-redundant variables with the non-parametric ACP technique, and obtained a susceptibility prediction model using logistic regression, with two types of variables: dependent (landslides inventory from field observation) and independent (slope, slope length factor, topographic wetness index, flow path length, soil units and rate of convergence) resulting in a susceptibility map, reclassified into categories according to the values of probability. The prediction model could not be quantitatively assessed because of the absence of studies with a semi-detailed scale, but the estimation of the mean square error of elevation, from which the terrain parameters were derived, the level of detail and the performance of the classifier with ROC curve, yielded a zoning consistent with the findings of the field visits.

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Comparison of Aster and SRTM Digital Elevation Models at One-Arc-Second Resolution Over Turkey

Cited by 5 publications

References 5 publications

Designing high resolution countrywide DEM for Turkey

Designing high resolution countrywide DEM for Turkey

Morphometric Analysis of Saz-Çayırova Drainage Basin using Geographic Information Systems and Different Digital Elevation Models

Determination of landslide susceptibility in linear infrastructure. Case: aqueduct network in Palacé, Popayan (Colombia)

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