去年夏天,我在伊河东湾水庫的1/5000测图中,曾采用了“斜尺讀數法”在地面坡度陡峻的地方作过試驗。試驗結果是不能令人滿意的:經試驗的6个正返覘中,就有兩个點的高差不符值超过限差(这兩點所处的地面坡度在30°以上);有两个點几乎接近限差。这个情况出現以后,当時便从理論上与实际效果上進行了一些探討。初步認为:用“斜尺讀數法”并不比“視距法”高明,因为二者在求待定點的高差 Last summer, on the 1/5000 map of the East Bay Reservoir in Ihe, I used the “Oblique Scale Reading Method” to test where steep terrain is steep. The test results were unsatisfactory: two of the six positive-going tests tested exceeded the tolerance (the slope of the ground where the two points are located is above 30 °); two The point is almost close to the limit. After this situation appeared, some discussions were made on the theoretical and practical effects at that time. Preliminary view: the use of “oblique scale reading method” is not better than the “horizon method” smart, because the two in the determination of the fixed point height difference