搜索结果: 1-15 共查到“知识库 测绘仪器”相关记录158条 . 查询时间(1.812 秒)
基于GF-2卫星数据的孕穗期小麦叶面积指数反演——以河北省廊坊市为例
植被指数 神经网络 叶面积指数(LAI) 反演方法 精度验证
<
2018/4/10
叶面积指数(leaf area index,LAI)是评价植被长势和预测产量的重要农业生理生态参数。高分2号(GF-2)卫星数据具有高空间分辨率特点,能反映更多细节信息,针对该数据特点的LAI反演方法具有较高的研究价值。以河北省廊坊市万庄镇为研究区,对孕穗期小麦采用了回归模型和神经网络算法反演LAI; 采用4种植被指数与实测LAI值构建回归模型,同时重点探讨了PROSAIL模型结合神经网络方法进行...
针对2D/3D点包含判定方法的复杂和低效问题，提出基于点圆理论的方法：分类描述奇异情形在点圆中的投影、叠加特征及判定方法，将3D点包含测试转换为与2D点包含测试一致的算法（除子平面方程系数计算外）。筛选和累加与射线相交的射线以上或以下的线段，据此奇偶性判定3D或2D点包含；解析2D射线与多边形相交连续线段内节点的几何特征，即y坐标要么都大于、要么都小于测试点，构建高效2D点包含增量筛选射线法。实验...
矿山测量国家级虚拟仿真实验教学中心
矿山测量国家级虚拟仿真实验教学中心 国家重点学科 矿山测量仪器
<
2022/8/30
矿山测量国家级虚拟仿真实验教学中心依托江苏省测绘与国土信息实验教学示范中心、测绘科学与技术江苏省一级重点学科和大地测量学与测量工程国家重点（培育）学科，以“战略指引、产学研互动、虚实结合、协同创新”的建设理念，“虚拟实验-企业实践-实践反馈-虚拟改良”的虚拟仿真实验教学可持续发展的建设模式，立足学校优势，建设的开放性虚拟仿真实验教学平台。
辐射带AP9模式在南大西洋异常区的系统性量化评估
AP9辐射带模式 评估 南大西洋异常区
<
2018/5/4
针对目前辐射带AP9模式量化评估不够系统的问题，基于F10.7指数确定高、中、低太阳活动水平，以三种太阳活动水平条件下NOAA-15观测的140~500MeV的全向质子通量为参考数据，以南大西洋异常区为对比区域，定义边界吻合度和大小量级差为评估指标，将辐射带AP9模式分别与AP8模式和参考数据进行对比，对AP9模式进行系统性量化评估.结果表明，AP8和AP9模式均能重构出南大西洋异常区，但AP8模...
2014年APEC期间北京市PM10和PM2.5氧化性损伤能力研究
PM2.5 APEC会议 质粒DNA损伤评价法 氧化性损伤能力 暴露风险
<
2016/12/3
为评估APEC会议期间联防联控措施对北京市大气可吸入颗粒物毒性的影响，采集2014年APEC会议前后3个月北京市大气PM10和PM2.5样品，应用质粒DNA损伤评价法来研究其氧化性损伤能力. 结果表明，APEC会议期间PM10对DNA的损伤率高于PM2.5，颗粒物对 DNA损伤率随剂量的增加而增加. 本研究用TD30值来指示颗粒物氧化性损伤能力，TD30为引起30%的DNA损伤率所需要的颗粒物剂量...
稀疏数据条件下，弹道系数是影响低轨空间碎片精确轨道确定与预报的关键因子。使用长期累积的TLE（二行根数）跟踪数据，通过半长轴的大气阻力摄动方程，将2 000多个轨道近地点高度低于850 km的空间碎片的弹道系数进行估算，得到这些空间碎片的弹道系数值，并给出弹道系数的两个应用实例。第一个应用实例关于利用弹道系数进行TLE的数据质量检测。使用质量检测方法剔除质量可疑的TLE后，对14个面质比较大的空间...
Discussion of GPS Supported Automatic Triangulation Based on the DMC Images
Photogrammetry ISAT GPS\INS IMU DMC
<
2015/12/11
With the development of modern aerophotogrammetry technology, GPS\INS(IMU) have been applied more and more widely. Data received by airborne GPS, can define the position of photography station. And th...
Synthesis of Investigations under ISPRS-ISRO CARTOSAT-1 Scientific Assessment Programme Primarily for DSM Generation
Cartosat-1 DSM generation DSM Quality Assessment Orthoimage Feature extraction Topographic mapping
<
2015/11/24
Cartosat-1 with two identical optical sensors Fore & Aft operating in panchromatic band to operationally acquire along-track stereo images (or wide-swath mono images) was launched by the Indian Space ...
The Use of Unmanned Aerial Vehicles (UAVS) for Remote Sensing and Mapping
Platforms Technology Multisensor Research Unmanned
<
2015/11/24
The ISPRS congress in Istanbul has adopted a resolution that called for the study of the use of Eaves in remote sensing and mapping. In the past four years, a wide range of these platforms has been us...
UAV for Mapping-Low Altitude Photogrammetric Survey
Photogrammetry Mapping UAV Automatic Aerial Triangulation Camera Calibration
<
2015/11/24
Two kinds of platform are accepted for mapping UAV system. One is remotely-piloted aircraft. Another is unmanned helium airship.A super-wide-angle camera is constructed by four digital cameras, mounte...
Multi-Image Matching for DTM Generation from SPOT-5 HRS/HRG and IRS-P5 Imagery - For the Project of West China Topographic Mapping at 1:50,000 Scale
Geometrical Constrained Cross-Correlation
<
2015/11/23
High-resolution satellite images (HRSI) at sub-5m footprint such as IKONOS, IRS-P5 (CartoSat-1) and SPOT-5 HRG/HRS images are becoming increasingly available to the earth observation community and the...
Research on Date Collecting and Rapid Map Updating of Forest Resources Based on 3S Technology
3S integration Dynamic monitoring of forest resources Data acquisition Data updating
<
2015/11/23
In this paper, the integration of “3S” technology is used to acquire forest resources information as well as to update related maps. It combines the “3S” high-tech with the monitoring of forest resour...
A New Peer-to-Peer-based Interoperable Spatial Sensor Web Architecture
GIS Internet/Web Interoperability Multisensor Distributed
<
2015/11/23
With the rapid advances in sensor network, and information and communication technologies, the vision of a World-Wide Sensor Web (WSW) is becoming a reality. However, there is a lack of a spatial info...
The Research and Design of the Base-height Ratio for the Three Linear Array Camera of Satellite Photogrammetry
Three linear Array CCD camera Satellite photogrammetry Space intersection angle
<
2015/11/23
In the satellite photogrammetry, the base-height ratio greatly impacts the elevation accuracy of the targets for the plotting map, and the greater base-height ratio, the higher elevation precision. Th...
Research of Producing and Managing Topographic Mapping and Building Data in One System Harmoniously
Research Producing Managing Topographic Mapping Building Data One System Harmoniously
<
2015/11/23
Data for building topographic database (DLG) and data for mapping are two kinds of data which connected each other, as well as different each other. Though DLG data can be transformed to mapping data ...