自製視覺化地圖於地形呈現之研究

本研究以自行發展的視覺化地圖，評估其在輔助地形判釋的可行性。相關圖資以GMT軟體繪製，並使用自行發展之Fortran程式處理較複雜之計算。在地形坡度方面，採用加權八鄰域法計算；在地形開闊度方面，本研究針對搜尋半徑與地形對比值之設定值做探討。本文研究區域包括台東美蘭河階、南投九九峰、苗栗火炎山以及台南頂頭額砂洲等，本團隊將各研究區域繪製成視覺化地圖，並與航照圖進行比較。研究發現自製之視覺化地圖對於微地形（沖蝕溝、河階與沙洲等）之呈現十分明顯，且能提供土砂災害、集水區判定以及地形變遷之良好參考。本研究之最終目的為希望自製視覺化地圖能對於後續災害防治、水土保持、環境監測與資源探勘等做出貢獻。

關鍵字

自製視覺化地圖；地形開闊度；地形坡度

並列摘要

This study is aimed at developing self-created visualization maps to analyze feasibility of aiding in terrain interpretation. We use the Generic Mapping Tools (GMT) for plotting the visualization maps, and the Fortran programs for processing the complex computations. In computations of terrain slopes, the Horn method is used; In computations of terrain openness, we discuss the given values of the search radii and the terrain contrasts. The study areas include the Meilan river terrace in Taitung, the Jiou-Jiou peaks in Nantou, the Huoyanshan in Miaoli, and the Ding-To-A sandbars in Tainan. We generate the visualization maps of the study areas and compare them with the aerial photos. The results show that the self-created visualization maps can better highlight the micro-topographies (gully, river terrace, sandbank, and so on), and also can provide valuable references for landslide disasters, catchment divisions and terrain changes. The main purpose of this study is to further bring contributions to disaster prevention, soil and water conservation, environmental monitoring, and resource exploration.