一是研究的属性问题，即理论研究和应用研究在资料利用方面的不同：理论研究要求数据资料的时间连续性和空间完整性，但对数据的现势性没有特别要求；
First, the attribute of studies, theoretical research is different from applied study: the former requires data to be continuous in time and entire in space, but the latter demand the data to be new.
制作野外调查图是保证野外调查顺利进行，从而获得完整可靠数据资料的重要工作。
The construction of the field investigation map is an important task which can guarantee the smooth performance of field survey so as to obtain complete and reliable data.
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