建立XYZ檔
1. 開QGIS將所選DEM圖層轉成.XYZ檔
.xyz檔就是將DTM每個點位轉成X軸、Y軸、Z軸顯示
內政部20M DTM 使用的CRS(大地地理座標) 為 TWD97-121 (EPSG:3826)
2. .XYZ檔打開後看到第一行(286XXX)為經度(X軸)
第二行(276XXX)為緯度(Y軸)
第三行為高程(Z軸)
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