【摘 要】
：
DEM data is an important component of spatial database in GIS. The data volume is so huge that compression is necessary. Wavelet transform has many advantages and has become a trend in data compressio
【出 处】
：
Geo-Spatial Information Science
论文部分内容阅读
DEM data is an important component of spatial database in GIS. The data volume is so huge that compression is necessary. Wavelet transform has many advantages and has become a trend in data compression. Considering the simplicity and high efficiency of
其他文献
在科技论文中,插图作为辅助表达手段是必不可少的,它可以形象、直观地表达科学思想和技术知识,又可以使内容的叙述更加简洁、准确和清晰。插图的质量是影响科技出版社版面设计质量的主要因素,同时又是困扰编辑的一个难题,因此,在文本编辑软件中插入质量较高的插图就显得非常重要。
国土资源安全问题我国是世界上水土流失最严重的国家。据近期遥感调查,目前我国水土流失面积达367万平方公里,占国土面积的38.2%,并且面积还在扩大。全国每年新增水土流失面积1万平方公里,每年流失的土壤达50多亿
RFID技术作为一项重要的非接触式识别枝术,近来发展迅猛。本文对RFID天线相关的技术进行了专利战略分析,主要包括:RFID天线相关整体行业分析、RFID标签天线和制造工艺等三个方面,分析了如下主要指标:申请年度发展趋势、主要申请人地区分布、IPC分布、DWPI分布、主要申请人分布、核心专利排名、专利地图。根据分析结果,本文给出了分析结论,对相关企业在专利利用、保护和管理方面给出了建议与对策。
提出了一种地形图上等高线分离方法,方法建立在基于方向检测的线宽识别算法基础上,使等高线分离具有很强的宽度敏感性,同时由于在线宽识别过程中考虑了等高线的空间连续性,方法具有很好的分离效果。实践证明,算法可以为等高线进一步矢量化提供高质量的底图,减少等高线自动矢量化的后续编辑工作量,具有很强的实际意义和理论价值。
今年,《北京测绘》杂志创刊20周年。20个春秋,在主管和主办单位、测绘企业和专家学者始终如一地支持下,在读者、作者孜孜
Along with the industrial development, adverse im- pacts on the natural environment become more serious, and eco- system health and ecological security have also been deteriorated. The traditional env
Starting with a simple presentation of location determination techniques, physical location and geographic location as two common kinds of location description methods are discussed. The semantic loca
A novel model of land suitability evaluation is built based on computational intelligence (CI). A fuzzy neural network (FNN) is constructed by the integration of fuzzy logic and artificial neural netw
By using remote sensing images from three periods (1980, 1995, 2000) and with the support of GIS and RS, the spatial information of landscape elements of Jilin Province from 1980 to 2000 was interpret