Evaluation of ASTER GDEM using GPS benchmarks and SRTM in China

Li, Peng; Shi, Chuang; Li, Zhenhong; Müller, Jan-Peter; Drummond, Jane; Li, Xiuyang; Li, Tao; Li, Yingbing; Liu, Jingnan

doi:10.1080/01431161.2012.726752

Cited by 90 publications

(67 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A positive ME consistent with results of our study was reported by HIRT et al (2010) in Australia. LI et al (2013) reported a negative ME of the C-band DEM in China, but they were unable to explain their result. We believe that the different ME signs in various SRTM studies can be related to regional differences in terrain morphology or to differences in land cover (e.g., presence of forests).…”

Section: Discussionmentioning

confidence: 93%

“…Many studies have been motivated by particular applications in the field of hydrology (LUDWIG and SCHNEIDER 2006), geomorphology (GOROKHOVICH and VOUSTIANIOUK 2006), glaciology (KÄ Ä B 2005;FREY and PAUL 2012) or forestry (WALKER et al 2007). SRTM DEMs were compared to elevation data from various sources, including shuttle laser altimeter (SLA) (SUN et al 2003), advanced spaceborne thermal emission and reflection radiometer (ASTER) stereo-pairs (NIK- OLAKOPOULOS et al 2006), elevation data obtained from national resources (LUDWIG and SCHNEIDER 2006;ZIELIŃ SKI and CHMIEL 2007;SHORTRIDGE and MESSINA 2011;FREY and PAUL 2012) or field measurements (GOROKHOVICH and VOUSTIANIOUK 2006;KARWEL and EWIAK 2006;KARWEL 2012;LI et al 2013). Most of these studies incorporated discrete ground truth data, such as sets of ground control points (GCPs) or terrain profiles measured with a GPS device.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Assessment of the Accuracy of SRTM C- and X-Band High Mountain Elevation Data: a Case Study of the Polish Tatra Mountains

Kolecka

Kozak

2013

Pure Appl. Geophys.

View full text Add to dashboard Cite

Abstract-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.

show abstract

Section: Discussionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Assessment of the Accuracy of SRTM C- and X-Band High Mountain Elevation Data: a Case Study of the Polish Tatra Mountains

Kolecka

Kozak

2013

Pure Appl. Geophys.

View full text Add to dashboard Cite

show abstract

“…Several authors (e.g., Li et al, 2013;Ravibabu et al, 2010;Zhao et al, 2011;Suwandana et al, 2012;Mukherjee et al, 2013a;Czubski et al, 2013) have evaluated the accuracy of GDEM as well as SRTM and carried out comparative evaluation of two DEMs. Results from these studies indicated that, due to the inherent difficulties in acquiring satellite data both with the optical stereoscopic and the interferometric synthetic aperture radar (InSAR) technologies, global DEMs are not complete in and of themselves (Yang and Moon, 2003).…”

Section: T a Tran Et Al: A Geomorphology-based Approach For Digitamentioning

confidence: 99%

A geomorphology-based approach for digital elevation model fusion – case study in Danang city, Vietnam

et al. 2014

View full text Add to dashboard Cite

Abstract.Global digital elevation models (DEM) are considered a source of vital spatial information and find wide use in several applications. The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Global DEM (GDEM) and Shuttle Radar Topographic Mission (SRTM) DEM offer almost global coverage and provide elevation data for geospatial analysis. However, GDEM and SRTM still contain some height errors that affect the quality of elevation data significantly. This study aims to examine methods to improve the resolution as well as accuracy of available free DEMs by data fusion techniques and evaluating the results with a high-quality reference DEM. The DEM fusion method is based on the accuracy assessment of each global DEM and geomorphological characteristics of the study area. Land cover units were also considered to correct the elevation of GDEM and SRTM with respect to the bare-earth surface. The weighted averaging method was used to fuse the input DEMs based on a landform classification map. According to the landform types, the different weights were used for GDEM and SRTM. Finally, a denoising algorithm (Sun et al., 2007) was applied to filter the output-fused DEM. This fused DEM shows excellent correlation to the reference DEM, having a correlation coefficient R 2 = 0.9986, and the accuracy was also improved from a root mean square error (RMSE) of 14.9 m in GDEM and 14.8 m in SRTM to 11.6 m in the fused DEM. The results of terrain-related parameters extracted from this fused DEM such as slope, curvature, terrain roughness index and normal vector of topographic surface are also very comparable to reference data.

show abstract

“…GPS is the usual method to validate the absolute accuracy of DEM products, which has been utilized in SRTM and ASTER G-DEM accuracy validation studies (Goncalves and Oliveira 2004, Eckert, Kellenberger et al 2005, Rodriguez, Morris et al 2005, Rodriguez, Morris et al 2006, Reuter, Nelson et al 2009, Team 2009, Tachikawa, Kaku et al 2011, Fujisada, Urai et al 2012, Li, Shi et al 2013. However, such kinematic GPS transects only show planimetric features as they tend to be along existing roads.…”

Section: Introductionmentioning

confidence: 99%

Icesat Validation of Tandem-X I-Dems Over the Uk

Feng¹,

Müller²

2016

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

View full text Add to dashboard Cite

ABSTRACT:From the latest TanDEM-X mission (bistatic X-Band interferometric SAR), globally consistent Digital Elevation Model (DEM) will be available from 2017, but their accuracy has not yet been fully characterised. This paper presents the methods and implementation of statistical procedures for the validation of the vertical accuracy of TanDEM-X iDEMs at grid-spacing of approximately 12.5m, 30m and 90m based on processed ICESat data over the UK in order to assess their potential extrapolation across the globe. The accuracy of the TanDEM-X iDEM in UK was obtained as follows: against ICESat GLA14 elevation data, TanDEM-X iDEM has -0.028±3.654m over England and Wales and 0.316±5.286m over Scotland for 12m, -0.073±6.575m for 30m, and 0.0225±9.251m at 90m. Moreover, 90% of all results at the three resolutions of TanDEM-X iDEM data (with a linear error at 90% confidence level) are below 16.2m. These validation results also indicate that derivative topographic parameters (slope, aspect and relief) have a strong effect on the vertical accuracy of the TanDEM-X iDEMs. In high-relief and large slope terrain, large errors and data voids are frequent, and their location is strongly influenced by topography, whilst in the low-to medium-relief and low slope sites, errors are smaller. ICESat derived elevations are heavily influenced by surface slope within the 70m footprint as well as there being slope dependent errors in the TanDEM-X iDEMs.

show abstract

Evaluation of ASTER GDEM using GPS benchmarks and SRTM in China

Cited by 90 publications

References 41 publications

Assessment of the Accuracy of SRTM C- and X-Band High Mountain Elevation Data: a Case Study of the Polish Tatra Mountains

Assessment of the Accuracy of SRTM C- and X-Band High Mountain Elevation Data: a Case Study of the Polish Tatra Mountains

A geomorphology-based approach for digital elevation model fusion – case study in Danang city, Vietnam

Icesat Validation of Tandem-X I-Dems Over the Uk

Contact Info

Product

Resources

About