Vertical Accuracy Assessment for the Free Digital Elevation Models SRTM and ASTER in Various Sloping Areas.

Document Type : Research Paper

Authors

1 Faculty of Engineering, Beni-Suef University, Beni-Suef, Egypt

2 Topographic Engineering Department, Faculty of Civil Engineering, Tishreen University, Lattakia, Syria

Abstract

The research applied ASPRS standards to determine the necessary number of check points to evaluate accuracy, with a proposed application of a simple method to identify outliers in elevation differences. Tests were conducted in the Latakia Governorate after dividing it into three areas: a moderate slope area, a moderate steep slope area, and a steep slope area. As for the check points, they were extracted from a topographic map with a scale of 1/25000.
The results showed a strong positive correlation between reference elevations and elevations extracted from both the SRTM and ASTER models in all test areas, with a Pearson coefficient value of 0.99. It was also found that the vertical accuracy of the SRTM model is better than that of the ASTER model in the moderate slope area, where this accuracy reached 11.899m. In the case of the moderate steep slope area, the research found that the elevations extracted from the SRTM model are more accurate than those extracted from the ASTER model, with a vertical accuracy value of 21.609m for the SRTM model and 23.145m for the ASTER model. In the case of steep slope area, it was found that the elevations extracted from the ASTER model are more accurate than those extracted from the SRTM model, with a vertical accuracy of 36.770 meters for the ASTER model and 40.538 meters for the SRTM model.

Keywords

Main Subjects

References

[1]          Aghataher, R., Samadi, M., Laliniat, I., & Najafi, I. (2016). Comparative assessment of vertical accuracy of SRTM and ASTER GDEM elevation data.
[2]          Gruber, U., & Haefner, H. (1995). Avalanche hazard mapping with satellite data and a digital elevation model. Applied Geography, 15(2), 99-113.
[3]          Stucky, J. L. D. (1998). On applying viewshed analysis for determining least-cost paths on digital elevation models. International Journal of Geographical Information Science, 12(8), 891-905.
[4]          Farr, T. G., Rosen, P. A., Caro, E., Crippen, R., Duren, R., Hensley, S., ... & Alsdorf, D. (2007). The Shuttle Radar Topography Mission Reviews of Geophysics, Vol. 45. RG2004, 10, 1-13.
[5]          Tachikawa, T., Hato, M., Kaku, M., & Iwasaki, A. (2011, July). Characteristics of ASTER GDEM version 2. In 2011 IEEE international geoscience and remote sensing symposium IEEE, pp. 3657–3660.
[6]          Satge, F., Denezine, M., Pillco, R., Timouk, F., Pinel, S., Molina, J., ... & Bonnet, M. P. (2016). Absolute and relative height-pixel accuracy of SRTM-GL1 over the South American Andean Plateau. ISPRS journal of photogrammetry and remote sensing, 121, 157-166.
[7]          Mukherjee, S., Joshi, P. K., Mukherjee, S., Ghosh, A., Garg, R. D., & Mukhopadhyay, A. (2013). Evaluation of vertical accuracy of open-source Digital Elevation Model (DEM). International Journal of Applied Earth Observation and Geoinformation, 21, 205-217.
[8]          Bildirici, I. O., & Abbak, R. A. (2017). Comparison of ASTER and SRTM digital elevation models at one-arc-second resolution over Turkey. Selcuk University Journal of Engineering, Science and Technology,5(1), 16-25.
[9]          Fazilova, D., Magdiev, K., & Sichugova, L. (2021). Vertical accuracy assessment of open access digital elevation models using GPS. International journal of Geoinformatics, 17(1), 19-26.
[10]      Kovalchuk, I. P., Lukianchuk, K. A., & Bogdanets, V. A. (2019). Assessment of open-source digital elevation models (SRTM-30, ASTER, ALOS) for erosion processes modeling. Journal of geology, geography and geoecology, 28(1), 95-105.
[11]      Elkhrachy, I. (2018). Vertical accuracy assessment for SRTM and ASTER Digital Elevation Models: A case study of Najran city, Saudi Arabia. Ain Shams Engineering Journal, 9(4), 1807-1817.
[12]      Florinsky, I. V., Skrypitsyna, T. N., & Luschikova, O. S. (2018). Comparative accuracy of the AW3D30 DSM, ASTER GDEM, and SRTM1 DEM: A case study on the Zaoksky testing ground, Central European Russia. Remote Sensing Letters, 9(7), 706-714.
[13]      Yang, L., Meng, X., & Zhang, X. (2011). SRTM DEM and its application advances. International Journal of Remote Sensing, 32(14), 3875-3896.
[14]      Jing, C., Shortridge, A., Lin, S., & Wu, J. (2014). Comparison and validation of SRTM and ASTER GDEM for a subtropical landscape in Southeastern China. International Journal of Digital Earth, 7(12), 969–992.
[15]      Rexer, M., & Hirt, C. (2014). Comparison of free high resolution digital elevation data sets (ASTER GDEM2, SRTM v2.1/v4.1) and validation against accurate heights from the Australian National Gravity Database. Australian Journal of Earth Sciences, 61(2), 213–226.
[16]      Zhang, Y., Han, T., Liu, H., Wang, X., & Zhang, E. (2017). Cooperation of the Spatial Interpolation Algorithm for the Contour Map of the Shockwave Overpressure Field. Journal of Engineering Science & Technology Review, 10(6).
[17]      Ghilani, C. D. (2017). Adjustment computations: spatial data analysis. John Wiley & Sons.
[18]      Baguio, C. B. (2009). Adaptive Robust Estimator of a Location Parameter for Some Symmetric Distributions. In Recent Advances in Technologies. IntechOpen.
[19]      Hohle, J., & Hohle, M. (2009). Accuracy assessment of digital elevation models by means of robust statistical methods. ISPRS Journal of Photogrammetry and Remote Sensing, 64(4), 398-406.
[20]      Iglewicz, B., & Hoaglin, D. C. (1993).  How to detect and handle outliers, Quality Press, Vol.16.‏
[21]      ASPRS Positional Accuracy Standards for Digital Geospatial Data. November 2014, Photogrammetric Engineering & Remote Sensing. 81 (3), 53. (accessed on: 25/6/2023).
[22]      NCSS 2021 Statistical Software (2021). NCSS, LLC. Kaysville, Utah, USA, ncss.com/software/ncss.
[23]      Hamoudi, S., Sh. (2009). Principles of Statistics and its Applications. Dar Al-Thaqafa for Publishing and Distribution, Oman.
[24]      Baral, S. S., Das, J., Saraf, A. K., Borgohain, S., & Singh, G. (2016). Comparison of Cartosat, ASTER and SRTM DEMs of different terrains. Asian Journal of Geoinformatics, 16(1).
[25]      Rawat, K. S., Singh, S. K., Singh, M. I., & Garg, B. L. (2019). Comparative evaluation of vertical accuracy of elevated points with ground control points from ASTERDEM and SRTMDEM with respect to CARTOSAT-1DEM. Remote Sensing Applications: Society and Environment, 13, 289-297.
[26]      Chang, K., & Tsai, B., 1991. The effect of DEM resolution on slope and aspect mapping. Cartography and Geographic Information Science, 18, 69-77.
[27]      Fujisada, H., Bailey, G., Kelly, G., Hara, S., & Abrams, M., 2005. ASTER DEM performance. IEEE Transactions on Geoscience and Remote Sensing, 43(12), 2707-2714.

Files

Share

How to cite

Statistics