1·The air rarefies at the top of the mountain.
山顶上的空气变得稀薄。
2·It mainly introduces a method that applies rarefies and smooth to the automatic forming contour line.
介绍了对自动生成的等高线进行圆滑和抽稀处理的一种方法。
3·Data quality control is very important during the collection GIS basal data. It mainly introduces a method that applies rarefies and smooth to the automatic forming contour line.
在GIS基础数据的采集过程中，数据质量的控制非常重要。介绍了对自动生成的等高线进行圆滑和抽稀处理的一种方法。