In seismic inversion, the result is non-unique because of the finiteness and error of measured data the obtained model is the average value of the real model.
在地震反演中，由于观测数据的有限性和误差，使得地震反演结果的非唯一性广泛存在，求得的模型是实际模型在一定范围内的平均值。
The systematic errors which exists in the measured data are revealed in this paper, and the non-accuracy of the medium error index dealing with directions are pointed out.
本文提出了经纬仪在测量数据中所存在的系统误差，从而指出了采用方向中误差指标的不确切性。
To eliminate the error caused by the process of fixing the measured piece on the measuring instrument, it is necessary to revise the data of the direct measurement.
为消除被测件在测量仪器上的安装定位过程带来的误差，必须对直接测量的数据进行修正。
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