浅谈RTK技术在地籍测量中的应用     

李福顺  姚正明 《东北测绘》2012,(1):142-144

RTK技术以其精度和自动化程度都比较高的优势,成为地籍测量中的重要技术手段之一。针对地籍测量的要求,从经济、精度、效率各方面探讨RTK技术在地籍测量中的应用问题,提出切实可行的技术方案。探讨了RTK技术用于地籍碎部测量的可行性,分析了各种误差的来源及对定位精度的影响,提出有效的减弱或消除措施。  相似文献   

在农村村庄地籍调查中采用航空摄影测量技术方法的应用研究     

曹泉根 《江苏测绘》2012,(5):51-53

本文探讨了航空摄影测量技术方法在农村村庄地籍调查中的应用方法,描述了其作业方法和技术流程,同时将航测法村庄地籍测量方法与全野外地籍测量方法在界址点、界址边和宗地面积的精度方面做了对比分析,并对其作业效率和经济效益做了初步分析,具有较强的说服力和较高的推广价值。  相似文献   

实验地貌的观测方法讨论     

王书芳  徐向舟  徐飞龙 《测绘科学》2012,(2):149-151,178

实验地貌观测方法的选择直接影响试验观测的精度和效率。数字近景摄影测量技术具有较高的观测精度和效率,其设备简单易操作且成本相对较低,但观测精度仍需结合传统手段进行率定和校核;点云式激光扫描技术使用范围广、精度高,但设备制作成本高、数据处理量大,等值线式激光扫描技术克服了上述缺点;超声波地形仪多用于水下地形观测,应用范围及效率精度有待改进。实验地貌观测技术未来的研究趋势应朝着高精度、高效率、操作简便的方向发展。  相似文献   

基础地理信息数据库的快速出图技术     

殷勇  印洁  丁圣陶  叶关根 《测绘科学》2012,37(5):197-199,218

针对当前地图制图自动化程度较低以及工作强度大的特点,通过分析国家基础地理信息数据编码特征以及制图工艺流程,依托基础地理信息数据库,本文提出基于地图专家知识模板的快速制图解决方案,解决注记自动配置以及符号复用等快速制图关键技术,最终服务于应急出图以及大批量的工程化出图,并在1∶250 000公众版地图出图中得到了推广应用。  相似文献   

Life Geography from the Child's Point of View     

《The Journal of geography》2012,111(3):98-101

Abstract

A second look is taken at “The Geography of the U.S. in the Year 2,000.” A new interplay is seen of the countervailing pressures to disperse and to agglomerate. Polynucleated urban regions are seen, organized within and around a global poly center. There are certain imperatives: those of demographic cycles and of the economic long wave. These will interact with information-age technologies to change family structures, life styles, and locational preferences. The unexpected also should be expected: “catastrophes” in which existing arrangements are transformed and new structures put into place to replace them. A key to understanding is to continually probe the second derivatives: change in the nature of change.  相似文献   

Comparing Teacher-Directed and Computer-Assisted Instruction of Elementary Geographic Place Vocabulary     

《The Journal of geography》2012,111(4):147-154

Abstract

Increased knowledge of geographic place name vocabulary continues to be important to student academic success. Place knowledge is a vital part of students' learning to be responsible citizens by helping them become more conscious of the world around them and preparing them to enter a global workplace. This study compares computer-assisted to teacher-directed instruction for teaching elementary geographic place name vocabulary. Direct instructional methods can improve student performance with clearly identified student objectives, structured content delivery, and monitoring of progress. Instruction provided via computers appears to be a more effective method than traditional direct instruction.  相似文献   

Paper versus Pixel: Effectiveness of Paper versus Electronic Maps To Teach Map Reading Skills in an Introductory Physical Geography Course     

《The Journal of geography》2012,111(5):195-202

Abstract

This article addresses the lack of outcome-based research on the integration of technology into pedagogy at the undergraduate college level. It describes a study performed at a Midwestern university, testing the relative effectiveness of paper and electronic topographic maps for teaching map-reading skills, and considers the relationship between learning styles and paper or digital map preference. Results indicate that, although student map skill performance did not differ significantly with the use of paper or electronic maps, students preferred paper maps. Neither their performance nor their preferences were related to learning style. The article discusses the significance of these findings.  相似文献   

基于地理信息技术油松(Pinus tabuliformis)根长密度估算及空间分布特征分析          下载免费PDF全文

荐圣淇  赵传燕  方书敏  余凯  彭守璋  柳逸月  李彦甫 《干旱区地理》2012,35(4):599-606

 定量研究植物根系的生长发育及时空分布特征是构建根系吸水模型、计算根系吸水量的基础。选择陇中黄土高原定西安家沟流域为研究区,对研究区内的油松(Pinus tabuliformis)吸水根系空间分布特征进行研究。利用剖面法获取不同空间点上的吸水根系,基于地理信息系统技术估算油松吸水根系的根长密度。结果表明：在水平方向上,油松根长密度呈二次曲线分布,吸水根系主要集中在0～400 cm范围内;在垂直方向上,油松吸水根系呈对数分布,吸水根系主要集中在0～100 cm范围内。并构建了油松吸水根系的二维空间分布方程。  相似文献   

浙江省科技资源的区域差异及其空间配置效率研究   总被引：1，自引：0，他引：1  

陈修颖  陈颖 《地理科学》2012,(4):418-425

科技资源是科技活动的基础,是创造科技成果,推动整个经济和社会发展的要素的集合。利用主成分分析法评价了浙江省各地级市科技资源的存量,并运用ArcView分析了浙江省科技资源的空间分布状况,利用数据包络分析法(DEA)评价了浙江省各地级市的科技资源配置相对效率,利用柯布-道格拉斯生产函数和索洛余值法计算了各个地级市的科技进步对于经济发展的贡献率。结果表明:①浙东北的科技资源及科技进步贡献率都要明显高于浙西南,同时浙东北、浙西南内部也存在着较大的差异。②杭州市、嘉兴市、绍兴市、金华市、舟山市和丽水市科技资源配置效率较高,而宁波市、温州市、湖州市、衢州市和台州市的科技资源配置效率相对较低。  相似文献   

Re‐examining green revolution diffusion and factor/input markets in Bangladesh after market liberalization     

Sanzidur Rahman  Ismat Ara Begum  Mohammad Jahangir Alam 《Singapore journal of tropical geography》2012,33(2):241-254

This paper re‐examines the effect of green revolution (GR) diffusion on factor/inputs demand in Bangladesh using an empirical model that allows for simultaneous determination of factors influencing adoption of GR technology at the current mature stage, as well as access to irrigation. Results reveal some alignments with conventional wisdom as well as few surprises. For example, while an increased demand for major inputs is expected, an increased demand for organic manure is an unexpected positive outcome. The GR adoption rate is significantly higher in villages with access to irrigation and fertile soils and, surprisingly, in infrastructurally underdeveloped villages. Together with other expected findings of GR technology uptake with higher cereal prices and irrigation use encouraged by access to credit, tenurial status and fertile soils, our findings suggest that investment in irrigation and soil conservation, as well as implementing measures to improve cereal prices and provide agricultural credit, could boost GR technology adoption.  相似文献