平面與大地：測量學緒論教學裡的一項探討

「平面測量」與「大地測量」之分野，是部份測量學教科書中緒論裡的一個課題。其主要內容，在於討論測量學中必須考量地球曲率之時機。此一決定的關鍵，當然在於面積的大小與距離的遠近，另一個因素是該測量工作對精度的需求。教材中探討之方式，多由觀測量著眼。由邊長、夾角、高程差，作為分析項目。本文延續此一思考方式，針對部分教材中使用之解說圖形與文字裡的疑點，予以探討，以為修習者參考。 The differentiation between “Plane Surveying” and “Geodetic Surveying” is one of the subjectsin the introduction section for some textbooks. The key issue is when earth curvature should beconsidered. The major factors for the evaluation include the size of survey area and the distance ofthe measurements. Accuracy specification of the survey project is another key factor. The way ofdiscussion in the textbooks is basically from the evaluation of the observations, distance, horizontalangle, and height differences. This paper follows the same strategy to describe this subject. Somedescriptions and figures used in the textbooks are also discussed for exploring their meaning.

The differentiation between “Plane Surveying” and “Geodetic Surveying” is one of the subjectsin the introduction section for some textbooks. The key issue is when earth curvature should beconsidered. The major factors for the evaluation include the size of survey area and the distance ofthe measurements. Accuracy specification of the survey project is another key factor. The way ofdiscussion in the textbooks is basically from the evaluation of the observations, distance, horizontalangle, and height differences. This paper follows the same strategy to describe this subject. Somedescriptions and figures used in the textbooks are also discussed for exploring their meaning.