本文研究利用光達資料進行二種自動化的作業,一是生產數值高程模型,二是偵測房屋區。第一部份主要是利用二種數學形態學的方法,平坦操作及圓頂轉換,在高程空問中自動重建地形以區隔出地物點,藉由保留的地面點來產生數值地表模型。第二部份則延用第一部份的地物點的群聚區塊,切取高度超過3公尺且面積較大的地物區,經斜率差計算後,使用10種統計量來偵測房屋位置。在數值高程模型產製部份,以新竹科學園區及大坑地區為測試區,本文成果與人工過濾成果進行精度評估,得平均值分別為-0.16m和0.07m、均方根誤差分別為0.45m和0.59m。至於房屋偵測部份,在新竹科學園區的測試區之成功率為87.7%。
There are two main parts in our research. The first is to segment objects and to produce digital terrain model by using two mathematical morphology methods, i.e. flattening operation and H-Dome transformation, and control posts. The second is to detect buildings by slice the objects’ height, filtering out small areas and computing their statistics of differential slope on region-based method. There are two test areas, one is around Hsin-Chu Science Based Industry Park, and the other is around Ta-Keng area. The results of accuracy for digital terrain model production are -0.16m and 0.04m for mean, 0.45m and 1.12m for RMSE, respectively. And the successful rate for building detection is 87.7%