期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
农村土地调查时空数据模型构建及应用 被引量:3
1
作者 胡彦波 吴华瑞 朱华吉 《江苏农业科学》 北大核心 2014年第9期387-391,共5页
随着我国土地调查工作的开展,获得了大量的土地调查历史数据,尤其是农村土地数据,具有典型的时态特征,使其存储和管理对现有的时态数据模型提出了挑战。土地变化的模拟、查询和显示的根本在于时空数据模型的建立。本研究在对农村土地调... 随着我国土地调查工作的开展,获得了大量的土地调查历史数据,尤其是农村土地数据,具有典型的时态特征,使其存储和管理对现有的时态数据模型提出了挑战。土地变化的模拟、查询和显示的根本在于时空数据模型的建立。本研究在对农村土地调查数据的时间、空间语义分析的基础上,借助于面向对象思想,对时空数据建模进行了研究,提出适合于农村土地调查数据的面向对象时空属性概念模型,为土地时空信息的有效组织、管理和查询提供了新的思路和方法,达到了降低数据冗余,提高检索效率的目的。 展开更多
关键词 土地调查历史数据 时空数据模型 面向对象 土地时空信息
下载PDF
Dynamics of Soil Erosion in Xingguo County, China, Determined Using Remote Sensing and GIS 被引量:19
2
作者 PANJian-Jun ZHANGTao-Lin ZHAOQi-Guo 《Pedosphere》 SCIE CAS CSCD 2005年第3期356-362,共7页
The spatial and temporal dynamics of soil erosion in Xingguo County, Jiangxi Province, China were studied using multi-period remote sensing images and GIS. The results indicated that the soil erosion status of the reg... The spatial and temporal dynamics of soil erosion in Xingguo County, Jiangxi Province, China were studied using multi-period remote sensing images and GIS. The results indicated that the soil erosion status of the region has been improving, particularly since the 1980s, with the erosion rate showing an evident decline over the past 30 years. The improvement showed not only in the decline of eroded soil area, but also with the reduction in the extent of erosion. The extent of erosion mainly changed by one level, and the change primarily occurred with the severely or moderately eroded soil types. However, in general, soil erosion was still an overriding problem in the region with some areas becoming more serious, especially those with large quantities of granite. 展开更多
关键词 GIS remote sensing soil erosion spatial and temporal dynamics Xingguo County
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部