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用手表确定大致方位是地理野外实践的一种能力,可以帮助学生提高野外生活能力、掌握生活技巧。不过,手表辨向虽然操作简单,但精度较差。除了需要注意地方时与北京时间的差别外,辨向精度还与所在地的地理纬度、辨向日期和时刻有关系。太阳地平高度较低时,辨向精度较高;高纬地区的辨向精度大大高于低纬地区。本文论述了手表定位的方法及适用范围,并给出了误差计算的方法,提供了一个可以计算任意地区、任意时刻手表辨向误差的Flash演示程序。
Using a watch to determine the approximate location is a field geography ability to practice, can help students improve their ability to live in the field, master life skills. However, the watch orientation although the operation is simple, but the accuracy is poor. In addition to the need to pay attention to when the difference between Beijing and time, the resolution accuracy is also the location of the geographical latitude, date and time-related. When the sun’s horizon height is lower, the orientation accuracy is higher; the orientation accuracy at high latitudes is much higher than that at low latitudes. This paper discusses the method of watch positioning and its application, and gives the method of error calculation, providing a Flash demo program that can calculate the discrepancy of watch’s position in any area and at any time.