Based on a data dimension compression technique, this paper studies the principles and method of remote sensing information extraction for urban built up land.
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。
We start at the rank-size rule by urban population and the rank-size rule by urban built-up area, and derive a mathematical relationship that the land use size of a city and its population.
从前人的成果，即以人口表示的城市位序-规模法则和以建成区面积表示的位序-规模法则出发，演绎出城市的用地规模和人口数量呈异速增长。
This paper uss the factor analysis to evaluate and compare the intensive land use of the urban built-up areas of 17 cities in Shandong province.
本文运用因子分析法对山东省17个地级市建成区的土地集约利用状况进行了评价和比较。
Generally, paddy is mainly transformed to orchard land and urban built-up land, while dry land is mainly to orchard land, forest land and undeveloped land in the decreasing arable land areas.
在减少的耕地中，水田一般转变为果园、建设用地，而旱地一般转变为果园、林地、未利用地。
Generally, paddy is mainly transformed to orchard land and urban built-up land, while dry land is mainly to orchard land, forest land and undeveloped land in the decreasing arable land areas.
在减少的耕地中，水田一般转变为果园、建设用地，而旱地一般转变为果园、林地、未利用地。
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