共查询到20条相似文献，搜索用时 46 毫秒
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无越流补给承压含水层不完整井非稳定流单井排放诱发… 总被引：1，自引：0，他引：1
研究了无越流补给承压含水层不完整井非稳定流单井排放诱发地壳形变的解析表达，讨论了表达式的计算方案，以２０个结点的Ｈｅｒｍｉｔｅ求积公式编制了相应的数值积分计算程序，并给出了模拟计算算例，表明了计算方案的可行性。 相似文献
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介绍了各种不同GPS测量的特点和数据处理方法，结合珠峰峰项GPS观测自然环境恶劣的特点，分析了各种计算方案，确定了一种合理的解算珠峰高程的GPS数据处理方案；取得了较为满意的计算结果。 相似文献
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机载激光测深中的波浪改正技术 总被引：3，自引：0，他引：3
基于我国新研制的机载激光测深系统基本配置，提出了3种可供选择的波浪改正计算方案(也称为深度值归算方案)，具体分析了3种方案的适用条件和应用范围，并从理论上对3种改正模型的计算精度进行了估算。 相似文献
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自适应空间信息移动服务 总被引：4，自引：0，他引：4
空间信息移动服务系统是空间信息系统继由传统PC计算环境向有线Web分布式计算环境扩展后，向移动计算环境的新发展。文中在分析移动计算环境概念和特点的基础上，讨论了空间信息移动服务的若干特点及关键技术，研究了自适应空间信息移动服务方案。 相似文献
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按巴乌曼投影公式进行中程距离的大地主题反解，是获得弹道导弹发射的大地基础诸元的有用方法之一。本文研究了旧算法的缺陷，设计了新算法方案，通过５００多例计算和比较分析，证实新算法有效地提高了计算精度，比较适宜我国采用。 相似文献
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海洋重力场特征参数在地球重力场逼近计算和海上测量优化设计中具有重要的应用价值。基于卫星测高重力在海域具有覆盖范围广且分布均匀的独特优势，提出了利用最新卫星测高重力数据集开展海洋重力场特征统计模型计算和分析的研究方案，给出了代表误差和协方差函数模型参数的计算公式，定义并研究了海洋广义布格重力异常的变化特征，提出了等精度和非等精度拟合经验协方差函数的计算模型。利用中国近海及西太平洋海区超过50万个5'×5'方块的1'×1'网格卫星测高重力异常数据，首次计算得到一组有代表性的中国周边海域重力场特征统计模型参数，较好地揭示了海洋重力场有别于陆地重力场的变化特征，利用海面船测重力数据对计算结果进行了可靠性检核，提出了相应的模型参数修正方案和使用建议。 相似文献
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土地平整测量计算方法的探讨 总被引：2，自引：0，他引：2
全站仪在测绘工作中的越来越普及，传统的土地平整计算方法已经无法适应新型仪器实时高效的特点，不能充分发挥仪器的性能，必须找出一种能充分利用新型仪器的优点，提高测量及计算速度的方法。本文探讨利用全站仪进行土地平整测量的计算方案。 相似文献
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《测绘科学技术学报》2013,(5)
构建了多视匹配过程的总计算量模型,根据模拟参数赋值结果,分析得到了其中的密集计算任务,探讨了其GPU并行加速的必要性;针对单立体影像匹配技术细粒度GPU并行计算方案的不足,研究并设计了一种多视匹配密集计算任务的GPU粗粒度并行计算方案;利用专业级的GPU并行计算平台,对GPU粗粒度并行计算方案进行了实验验证,结果表明,该方案对于多视匹配过程中密集计算任务的并行加速效果十分显著。 相似文献
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采用Landsat TM数据分析了阿克苏河—塔里木河断面水质污染状况,通过波段的DN值和常规监测数据建立能反映水质状况的
污染物监测模型。结果发现,将2000年常规监测数据代入模型后,与遥感数据的结果基本吻合| 重建阿克苏河—塔里木河的连续水体
污染变化曲线,得出污染物浓度随着远离上游而增加。 相似文献
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Monitoring drought dynamics in the Aravalli region (India) using different indices based on ground and remote sensing data 总被引：5，自引：0，他引：5
C. Bhuiyan R.P. Singh F.N. Kogan 《International Journal of Applied Earth Observation and Geoinformation》2006,8(4):289-302
The hard-rock hilly Aravalli terrain of Rajasthan province of India suffers with frequent drought due to poor and delayed monsoon, abnormally high summer-temperature and insufficient water resources. In the present study, detailed analysis of meteorological and hydrological data of the Aravalli region has been carried out for the years 1984–2003. Standardised Precipitation Index (SPI) has been used to quantify the precipitation deficit. Standardised Water-Level Index (SWI) has been developed to assess ground-water recharge-deficit. Vegetative drought indices like Vegetation Condition Index (VCI) and Temperature Condition Index (TCI) and Vegetation Health Index (VHI) have been computed using NDVI values obtained from Global Vegetation Index (GVI) and thermal channel data of NOAA AVHRR satellite. Detailed analyses of spatial and temporal drought dynamics during monsoon and non-monsoon seasons have been carried out through drought index maps generated in Geographic Information Systems (GIS) environment. Analysis and interpretation of these maps reveal that negative SPI anomalies not always correspond to drought. In the Aravalli region, aquifer-stress shifts its position time to time, and in certain pockets it is more frequent. In comparison to hydrological stress, vegetative stress in the Aravalli region is found to be slower to begin but quicker to withdraw. 相似文献
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Piyoosh Rautela Ramesh Chandra Lakhera 《International Journal of Applied Earth Observation and Geoinformation》2000,2(3-4)
The area around Sataun in the Sirmur district of Himachal Pradesh, India (falling between the rivers Giri and Tons; both tributaries of the Yamuna River) was studied for landslide vulnerability on behalf of the inhabitants. The study was made using extensive remote sensing data (satellite and airborne). It is well supported by field evidence, demographic and infrastructural details and aided by Geographic Information System (GIS) based techniques. Field observations testify that slope, aspect, geology, tectonic planes, drainage, and land use all influence landslides in the region. These parameters were taken into consideration using the statistical approach of landslide hazard zonation. Using the census data of 1991, vulnerability of the populace to the landslide hazard was accessed. As most of the infrastructure in the region is concentrated around population centres, population data alone was used for vulnerability studies. 相似文献
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ZHAN F. Benjamin 《地球空间信息科学学报》2011,(1)
Although it is well known that coseismic gravity changes take place during an earthquake, previous research has not yielded convincing evidence demonstrating that significant gravity changes occur before large earthquakes. Furthermore, even if we suspect that gravity changes occur before large earthquakes, we have yet to demonstrate how to consistently observe these changes for useful earthquake forecast that would bring benefits to society. We analyzed ground gravity survey data obtained in 1998, 2000, 200... 相似文献
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GNSS系统及其技术的发展研究 总被引：3，自引：1，他引：2
阐述了国际上卫星导航系统的总体发展,对美、俄、欧、中的四大全球系统,以及相关的区域系统和增强系统进行了简单的介绍,研究分析了GNSS系统及其技术的发展趋势,同时分析了我国Compass全球系统面临的机遇和挑战,并提出了我国未来工作的建议. 相似文献
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“4D”技术及其应用 总被引：13，自引：0，他引：13
介绍“４Ｄ”（即数字地面模型、数字正射影像、数字栅格地图和数字线划地图）系列产品的生产流程、关键技术、及其在耕地保护、防灾减灾救灾和城市规划等方面的应用方法。 相似文献
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《International Journal of Digital Earth》2013,6(1):66-87
Abstract Virtual Australia is not a well-defined or agreed concept. This discussion paper conceptualises Virtual Australia as a ‘virtual [digital] model containing and representing all non-trivial objects and their contextual environment – from blue sky to bedrock – in real world Australia’. It describes a scenario for Virtual Australia, one or two decades from now, in which the locations and conditions of non-trivial objects and their environment are updated automatically through a combination of remote sensing and wireless communication technologies in support of a ‘Supranet’. It then examines the concept of the ‘Supranet’ – a pervasive information network based largely on wireless technology linking the physical world to a virtual model in real time – and develops and discusses three principal characteristics of the Supranet: the ability to have or collect specific information (know); the ability to process information (think); and the ability to communicate that information. If, in the near future, any or all non-trivial devices are to some extent able to know, think and communicate, the potential for object autonomy will be realised. 相似文献
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自动车辆定位导航系统中传感器的误差分析 总被引：1，自引：0，他引：1
对国界定位导航系统中几种常见的辅助传感器所产生的误差进行了分析，导出了不同传感器的误差模型。这些误差模型是估计车辆位置的扩展卡尔曼滤波器的基础，同时也为选择适当的传感器提供了理论根据。 相似文献