Effect of Digital Elevation Model Sources on Accuracy of Automated Drainage Network Extraction based on Hydrological Spatial Analysis Methods

Main Article Content

Chanisa Sawangjan
Chatchai Tantasirin

Abstract

The automated drainage network extraction is a hydrological spatial analysis processes
use to derive drainage pattern of a watershed area based on the digital elevation model (DEM).
Different sources of the DEM may affect the obtained network. This study compared the effects of
using DEM from different sources including DEM from Land Development Department (LDD),
ASTER GDEM, SRTM and DEM obtained from ANUDEM algorithm on automatic drainage
network extraction. Accuracy of the extracted network was verified using field observation data.
Three different terrain characteristics of selected watershed including steep slope, moderate slope
area and flat area were compared.
It was found that the appropriated drainage area threshold (DAT) derived from different
DEM source were different. The higher DEM resolution, the lesser DAT was obtained. Drainage
density that derived from automated extraction method was larger than that from the topographic
map. The highest accuracy of extracted drainage network using the LDD DEM in the steep
watershed area was found while that from the ANUDEM, SRTM and ASTER GDEM were smaller.
The accuracy are equal to 85.83, 40.73, 38.75 and 29.55 percent, respectively. In the moderate
slope watershed, it was found that the accuracy of extracted drainage from SRTM was the highest
and smaller when the ANUDEM, SRTM and ASTER GDEM were used. The accuracy are equal
to 73.33, 72.45, 31.49 and 30.03 percent, respectively. The accuracy of the extracted drainage
network obtained from the different DEMs of the flat area watershed was smaller but in the same
order of that found from the moderate slope area. The accuracy are equal to 39.17, 37.77, 19.20
and 18.32 percent, respectively. Base on the results from this study, it is recommended that the
automatic drainage network extraction could be used when the higher DEM resolution.

Article Details

How to Cite
Sawangjan, C., & Tantasirin, C. (2019). Effect of Digital Elevation Model Sources on Accuracy of Automated Drainage Network Extraction based on Hydrological Spatial Analysis Methods. Thai Journal of Forestry, 38(1), 122–132. Retrieved from https://li01.tci-thaijo.org/index.php/tjf/article/view/245654
Section
Original Articles

References

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