通过压缩数据维的方式，研究城市建筑用地信息准确提取的原理和方法。
Based on a data dimension compression technique, this paper studies the principles and method of remote sensing information extraction for urban built up land.
一排排建设过半的公寓楼在原先的农业用地上拔地而起，其间出没的黄色建筑起重机的数量比这座拥有500万人口城市中的树木还要多。
Rows of half-completed apartment buildings rise over former farmland, each crowned with yellow construction cranes that seem to outnumber trees in parts of this dusty city of 5 million residents.
住宅坡屋顶设计对于增加建筑空间，节约用地和能源，丰富住宅户型，美化住宅、小区乃至整个城市面貌都有着举足轻重的作用。
The residential pitched design can increase construction of residential space, save land and energy, rich residential types, beautify dwelling houses, residential areas and urban.
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