地图显示、制图的背景 Background
美国航太总署地球大观，制图：杰西·艾伦(Jesse Allen)与罗伯特·西蒙(Robert Simmon)，使用了由美国航太总署地球观测1号小组提供的地球观测1号卫星的高级陆地成像仪的数据。
NASA Earth Observatory image created by Jesse Allen and Robert Simmon, using EO-1 ALI data provided courtesy of the NASA EO-1 team.
这类滤波器不仅可以有效地抑制图象中的噪声，而且较好地保持了图象的几何特征。
They can not only efficiently suppress noise in the image but also preserve the geometrical features of the image.
针对《画法几何及机械制图》课程的现状和面临的形势，指出其教学设计的宗旨应该是更科学地提炼课程的精髓。
In view of the Descriptive Geometry and Mechanical Drawing and the status of the situation, that the purpose of teaching should be more scientifically designed to extract the essence of courses.
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