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Extraction and Analysis of Topographic Variables from DTM: A Case Study in Jeju Island  

Kim Seok Choong (한국지질자원연구원)
Cho Sung Hyen (한국지질자원연구원)
Kim Hyoung Chan (한국지질자원연구원)
Publication Information
Journal of Soil and Groundwater Environment / v.9, no.3, 2004 , pp. 56-61 More about this Journal
Abstract
The topographic variables, which influence the precipitation phenomena, are classified by elevation (ELEV), slope (SLOPE), distance to sea (SEA), obstruction (OBST), barrier (BAR), roughness (SHIELD), extracted and analysed according to resolutions. This study is performed through 100 m, 200 m, 400 m, 600 m, 800 m and 1,000 m based on 50 m DTM using TOVA (Topographic Variables Extraction Program). The result of a case study on Jeju weather station says that the variance according to resolution is generally less than that according to cardinal direction, but particularly SHIELD values and some cases for 600m resolution have a significant results.
Keywords
topographic variables; DTM; resolution; cardinal directions; TOVA;
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