“一张图”中基础地形图数据新旧标准转换的难点及处理方法

结合"基于Oracle Spatial 11g的基础地形数据库建库、更新与管理关键技术研究"项目,介绍了地形数据新旧标准的区别,分析了基础地形数据在不同数据标准之间转换的难点,针对转换中的难点问题利用FME转换软件并结合人机互动的方式提出了解决方法。     

地形图分发格式转换及保密探讨

介绍了矢量地形图转换成栅格地形图的一般工作流程,阐述了利用Auto CAD图形处理软件和Adobe.Acrobat.Professional软件实现数据转换的快捷方法及具体步骤,还对地形图为什么要保密、如何解决地形图保密与实际应用之间的矛盾进行了阐述。     

两江新区东部区域地形图投影变形处理方法

两江新区东部区域位于重庆市独立坐标中东带结合部,无论采用重庆市独立坐标系中带还是东带,每千米边长高斯投影长度变形都在1．0～4．0 cm之间,超出规范规定。本文研究并确定控制两江新区投影变形的最终方案,建立了两江新区工程坐标系与重庆市独立坐标系的坐标转换关系,提出并编程实现了DXF格式地形图的坐标转换方法。     

基于C# 的FLAC3D到Surpac三维地质数据转换

将FLAC3D和Surpac应用于正演成矿模拟和反演预测评价来实现矿产资源的联合评价是找寻隐伏矿体的一种新思路。FLAC3D和Surpac的存储方式和数据结构有很大不同,为了使FLAC3D正演模拟的结果能导入Surpac中进行联合评价,采用C# 语言实现了FLAC3D的模拟数据（TXT数据）向Surpac的CSV数据转换。实验表明,此转换方法能够简单快速地将FLAC3D的模拟结果转移到Surpac软件中,具有较高的实用性。     

基于Global Mapper的测绘图形数据转换

Global Mapper支持多种格式的光栅、高程、矢量数据的读取与输出,并内置多种坐标投影方式。尝试挖掘其支持多种数据格式、多种投影模式的功能,快速实现测绘图形数据的转换。通过设置当前工作空间的坐标投影模式,然后打开任何其支持的、含有坐标投影信息的数据,所有数据均自动转换成当前的投影模式,最后将文件输出（另存为）为所需的格式,即可快速完成数据转换。转换的内容主要包括不同格式的DTM(Digital Terrain Model,数字地面模型)数据转换、相同格式但不同坐标投影之间的相互转换,以及卫星影像配准等     

浅论变更地籍测量中GPS RTK技术的应用

阐述了GPS RTK技术在变更地籍测量中的具体应用,包括GPS RTK工作基本原理、基站的选址和建立、外业测量的方法和步骤、内业的处理等,强调了在应用过程中应当注意的事项,以达到如何进一步提高地籍测量精度的目的.     

GIS中多源空间数据集成方法研究

针对GIS中存在的空间数据多源化问题,分析了空间数据多源化产生的原因和表现形式,并从空间数据应用角度出发,详细阐述了数据格式转换法、坐标系转换与投影变换法、几何纠正法等三种常用空间数据集成方法的基本原理。     

������С����֧��������������GPS�߳�ת�����

????GPS???????????ж??????BP?????????溯???????????????????????÷?Χ?????????????????????????????????С???????????????LSSVM??????????????????????LSSVM?????????????????С????????????????????С??????????С??????????в?????????????????????????????????????????????LSSVM????????????????????????????????????????????????????????????????LSSVM?????????GPS???????????     

Impact of labor transfer on agricultural land use conversion at rural household level based on Logit model

Since land and labor force are primary resources to be used and controlled by rural households, the allocation of labor forces will influence land uses, and further lead to land use conversion. The present study used the Binary Logit model to investigate the influence of labor force transfer, characteristics of rural households, location, and land market on agricultural land use conversion at rural household level. This study was conducted based on 329 valid questionnaires, which were obtained in Changshu, Rudong, and Tongshan counties, respectively representing the southern, middle and northern areas of Jiangsu Province. The results showed that land market participation, location, zonal difference and labor transfer had strong influences on agricultural land use conversion. The participation of land market had a strong positive effect on land use conversion, especially for the farmland converted to the fishpond. The nearer to the county seat, the more conversion of land use occurred. Particularly, the labor force transfer caused by wage employment decreased this conversion probability, while the labor transfer caused by self-employment led to more conversion; and the increasing of income from labor transfer increased the conversion. Moreover, land use conversions demonstrated zonal difference, which were more in Rudong and Changshu counties than in Tongshan County, and the factors influencing this conversion were different in the three regions.     

海道测量长期平均海面传递的异步效应计算与分析

利用异步效应的数学表达式,分析了异步效应与长期平均海面传递误差的关系.利用中国海区典型验潮站实测数据进行了异步效应及长期平均海面传递的数值计算,证实异步效应是影响长期平均海面传递精度的主要因素.