本文论述了对极轨气象卫星NOAA AVHRR图象进行重采样的必要性，研究了重采样与投影的方法，并利用ERMapper图象处理系统对重采样前后及经过投影处理的彩色图象进行了对比分析。

AS the component of National Coal Resources Information System(NCRIS),the Coal Field Geology Symbolic Library(CFGS92)is researched and developed according to two handboods which are the symbolic standard of national coal field geology mapping.One of the two handbooks is named Standard Symbols of Coal Field Geology,while the other is titled Standard Symbols for the Third Coal Field Forecast Mapping.The hierarchical structure and the main components of CFGS92 are discussed with the illustration of frame chart.The basic characteristics and the applied effects are analyzed and demonstrated through the concrete examples.The article sets up the specialized classification system and the applied classification system of coal field geology symbols.The coding rules of coal field geollogy symbols are expounded,and the operations of CFGS92 are studied as well.At last,the author pints out the developing prospect of CFGS92.