共查询到20条相似文献，搜索用时 24 毫秒
1.
The new Moderate-Resolution Imaging Spectroradiometer (MODIS) satellite image offers a large choice of opportunities for operational applications. The 1-km Advanced Very High Resolution Radiometer (AVHRR) image is not suitable for retrieval of field level parameter and Landsat data are not frequent enough for monitoring changes in crop parameters during the critical crop growth periods. A methodology to map areas of paddy fields using MODIS, geographic information system (GIS) and global position system (GPS) is introduced in this paper. Training samples are selected and located with the help of GPS to provide maximal accuracy. A concept of assessing areas of potential cultivation of rice is suggested by means of GIS integration. By integration of MODIS with GIS and GPS technologies the actual areas of rice fields in 2002 have been mapped. The classification accuracy was 95.7% percent compared with the statistical data of the Agricultural Bureau of Zhejiang Province. 相似文献
2.
Mapping paddy rice with multi-date moderate-resolution imaging spectroradiometer （MODIS） data in China 总被引：1，自引：0，他引：1
Hua-sheng SUN Jing-feng HUANG Alfredo R. HUETE Dai-liang PENG Feng ZHANG 《浙江大学学报(A卷英文版)》2009,10(10):1509-1522
The objective of this study was to obtain spatial distribution maps of paddy rice fields using multi-date moderateresolution imaging spectroradiometer （MODIS） data in China. Paddy rice fields were extracted by identifying the unique characteristic of high soil moisture in the flooding and transplanting period with improved algorithms based on rice growth calendar regionalization. The characteristic could be reflected by the enhanced vegetation index （EVI） and the land surface water index （LSWI） derived from MODIS sensor data. Algorithms for single, early, and late rice identification were obtained from selected typical test sites. The algorithms could not only separate early rice and late rice planted in the same fields, but also reduce the uncertainties. The areal accuracy of the MODIS-derived results was validated by comparison with agricultural statistics, and the spatial matching was examined by ETM＋ （enhanced thematic mapper plus） images in a test region. Major factors that might cause errors, such as the coarse spatial resolution and noises in the MODIS data, were discussed. Although not suitable for monitoring the inter-annual variations due to some inevitable factors, the MODIS-derived results were useful for obtaining spatial distribution maps of paddy rice on a large scale, and they might provide reference for further studies. 相似文献
3.
Remote sensing techniques have the potential to provide information on agricultural crops quantitatively, instantaneously
and above all nondestructively over large areas. Crop simulation models describe the relationship between physiological processes
in plants and environmental growing conditions. The integration between remote sensing data and crop growth simulation model
is an important trend for yield estimation and prediction, since remote sensing can provide information on the actual status
of the agricultural crop. In this study, a new model (Rice-SRS) was developed based mainly on ORYZA1 model and modified to
accept remote sensing data as input from different sources. The model can accept three kinds of NDVI data: NOAA AVHRR(LAC)-NDVI,
NOAA AVHRR(GAC)-NDVI and radiometric measurements-NDVI. The integration between NOAA AVHRR (LAC) data and simulation model
as applied to Rice-SRS resulted in accurate estimates for rice yield in the Shaoxing area, reduced the estimating error to
1.027%, 0.794% and (−0.787%) for early, single, and late season respectively. Utilizing NDVI data derived from NOAA AVHRR
(GAC) as input in Rice-SRS can yield good estimation for rice yield with the average error (−7.43%). Testing the new model
for radiometric measurements showed that the average estimation error for 10 varieties under early rice conditions was less
than 1%.
Project supported by the National Defense Scientific and Technological Committee of China(No. Y97#14-6-2) 相似文献
4.
城市应急联动系统是城市公共安全的重要保障,也是城市现代化的标志之一．通过介绍了国内外城市应急联动系统的发展现状,分析了福州市城市应急联动系统建设的必要性,并提出基于GIS与GPS的福州市城市应急联动系统建设的初步方案．该系统以GIS、GPS、通信、计算机、网络技术作支撑,整合城市多部门、多行业、多层次的已有系统和数据资源,基于Internet和WebGIS的分布式数据库和统一的空间信息基础设施平台,实现对城市紧急事件的实时响应和调度指挥． 相似文献
5.
嵌入式GPS数据采集与分析系统设计 总被引：2，自引：0，他引：2
介绍了一种基于嵌入式Linux系统和ARM9处理器的手持式GPS数据采集、处理、显示接收机的设计过程。采用ARM-Linux和ARM9处理器的系统作为开发平台,控制OEM板接收导航信息,并给出了GPS数据采集系统详细的软件设计方案,给出了提取GPS特征数据的算法。这些对研究嵌入式系统应用、GPS定位及其在组合导航中的应用以及对OEM板的二次开发等都具有实用价值。 相似文献
6.
李艳 《西安文理学院学报》2006,9(4):66-69
实现对GPS定位数据快速准确的接收是车辆导航系统设计的关键技术之一,结合应用实践,通过对GPS数据格式的解析和对WindowsCE环境下串行通信方式的研究,提出了利用多线程技术,采用文件异步读写方式接收GPS定位数据的实现方法. 相似文献
7.
Multi-year monitoring of paddy rice planting area in Northeast China using MODIS time series data 总被引：1，自引：0，他引：1
Jing-jing SHI Jing-feng HUANG Feng ZHANG 《Journal of Zhejiang University. Science. B》2013,14(10):934-946
The objective of this study was to investigate the tempo-spatial distribution of paddy rice in Northeast China using moderate resolution imaging spectroradiometer(MODIS) data.We developed an algorithm for detection and estimation of the transplanting and flooding periods of paddy rice with a combination of enhanced vegetation index(EVI) and land surface water index with a central wavelength at 2130 nm(LSWI2130).In two intensive sites in Northeast China,fine resolution satellite imagery was used to validate the performance of the algorithm at pixel and 3×3 pixel window levels,respectively.The commission and omission errors in both of the intensive sites were approximately less than 20%.Based on the algorithm,annual distribution of paddy rice in Northeast China from 2001 to 2009 was mapped and analyzed.The results demonstrated that the MODIS-derived area was highly correlated with published agricultural statistical data with a coefficient of determination(R2) value of 0.847.It also revealed a sharp decline in 2003,especially in the Sanjiang Plain located in the northeast of Heilongjiang Province,due to the oversupply and price decline of rice in 2002.These results suggest that the approaches are available for accurate and reliable monitoring of rice cultivated areas and variation on a large scale. 相似文献
8.
卫星遥感技术在红树林生态监测与研究中的应用进展 总被引：5，自引：0，他引：5
遥感技术是红树林生态监测中的关键技术。详细介绍了卫星遥感数据在红树林生态监测中的应用,叙述了人工目视解译、波段组合法、图像分类技术和模式分类等信息识别方法在探测红树林的生态学指标包括面积、分布范围、类内区分和类外区分以及动态变化等的应用和精度对比情况。此外,阐述了全球定位系统、地理信息系统和遥感技术在红树林生态监测中的综合应用的优势以及红树林遥感技术的发展前景。 相似文献
9.
为了解决监测终端操作系统多样化的问题,设计一款基于Qt的跨平台远程监控系统。该系统采用C/S模式,主要由信息采集系统、通讯系统以及远端监控系统组成。无人插秧机远程监控以Qt为开发平台,利用北斗卫星定位、4G通信网络、Socket通信、GIS、图像处理等技术,实现对远程无人驾驶插秧机工况参数的监测与控制,包括插秧机动力、行走、作业等各种信息。另外,通过对数据的分析处理,还可预测插秧机可能出现的故障。测试结果表明,该系统可有效实现对无人插秧机的远程监控,并解决了操作系统的可移植性问题。 相似文献
10.
The integration of water quality analysis simulation program （WASP） with a geographical information system （GIS） is presented.This integration was undertaken to enhance the data analysis and management ability of the widely used water quality model.Different types of data involved in WASP modeling were converted and integrated into GIS using a database method.The spatial data modeling and analysis capability of GIS were used in the operation of the model.The WASP water quality model was coupled with the environmental fluid dynamics code （EFDC） hydrodynamic model.A case study of the Lower Charles River Basin （Massachusetts,USA） water quality model system was conducted to demonstrate the integration process.The results showed that high efficiency of the data process and powerful function of data analysis could be achieved in the integrated model,which would significantly improve the application of WASP model in water quality management. 相似文献
11.
基于MapObjects组件的校园房产管理信息系统的设计与实现 总被引：2，自引：0，他引：2
GIS与办公自动化(OA)以及与管理信息系统(MIS)的集成是当前GIS应用领域的热点。相对于以传统GIS软件为基础的集成办法，以ComGIS理论和技术为基础的集成方法具有可扩展性好、高效无缝、成本低等特点。本文探讨了基于GIS组件开发房产管理信息系统的方法，该方法根据校园房产信息的特点，用Mapobiects组件管理空间信息，用SQL Server管理属性信息，采用客户端／服务器(C／S)的系统结构，以高分辨率遥感影像作为校区平面图的显示背景，实现了通过空间数据(校园楼层平面图，校区平面图)对房产可视化管理和分配。 相似文献
12.
Aluminum (Al) toxicity is the major factor limiting crop productivity in acid soils. In this study, a recombinant inbreed line (RIL) population derived from a cross between an A1 sensitive lowland indica rice variety IR1552 and an Al tolerant upland japonica rice variety Azucena, was used for mapping quantitative trait loci (QTLs) for A1 tolerance. Three QTLs for relative root length (RRL) were detected on chromosome 1, 9, 12, respectively, and I QTL for root length under Al stress is identical on chromosome I after one week and two weeks stress. Comparison of QTLs on chromosome 1 from different studies indicated an identical interval between C86 and RZ801 with gene(s) for Al tolerance. This interval provides an important start point for isolating genes responsible for A1 tolerance and understanding the genetic nature of Al tolerance in rice. Four Al induced ESTs located in this interval were screened by reverse Northern analysis and confirmed by Northern analysis. They would be candidate genes for the QTL. 相似文献
13.
Design of ERT system 总被引：2，自引：0，他引：2
INTRODUCTION Electrical resistance tomography (ERT) is a technique producing images based upon variations in conductivity, and has great potential in process ap- plications (Tapp et al., 2003). In an ERT system, current is injected to a pair of drive electrodes and voltage measurements are taken between sense elec- trode pairs, yielding resistance information for image reconstruction (Cilliers et al., 2001). Traditional ERT systems usually use high fre- quency sinusoidal waveforms as … 相似文献
14.
李明 《顺德职业技术学院学报》2013,(2):11-14
为了保证矿山的安全生产,利用工程试验研究方法讨论建立矿区地面控制测量系统的关键技术。研究表明,在地面建立卫星定位控制网是建立矿区控制测量系统的重要方法和途径;整个控制测量系统的建立,方法先进,精度可靠,不但为矿区安全生产提供了技术保障,而且对数字矿山、智慧矿山、矿山物联网、矿山六大系统的建设及矿山防灾减灾提供了基础地理框架。 相似文献
15.
《GPS原理与应用》课程的实验教学通过加强全球定位系统（GPS）和遥感（RS）的基础实验,并拓展与GIS（地理信息系统）的集成与应用,建立完整的GPS与RS、GIS耦合集成的创新性实验教学模式,达到GPS和RS实验课程培养全日制专业学位硕士研究生和本科生的创新能力、实践能力的要求,培养高层次和应用型的人才． 相似文献
16.
电力GIS系统中电力设施图形表达 总被引：1，自引：0，他引：1
张立 《深圳职业技术学院学报》2006,5(4):27-30
在电力GIS系统项目实施过程中存在着诸如地理信息与电力信息结合不紧密、数据量过大致使系统效率降低等问题。引发这些问题的根源在于电力GIS系统中图形数据的表达和组织上存在某种矛盾。本文主要探讨了电力GIS系统中电力设施图形表达上的2大难点问题,即电力线路与开关型电力设备(如杆上开关)的图形表达问题,并针对电力拓扑关系的表达提出了图形拓扑法和拓扑表法2种实现方式。 相似文献
17.
针对传统市政设施巡查频率高、记录问题反复、效率低下问题,提出一种基于 Android 系统的道路巡查方法。利用组件式 GIS 开发技术、空间数据拓扑分析技术、多源数据集成技术、软件系统集成技术等,开发市政设施巡查信息系统,并在厦门市思明区进行了试验。实践证明,该系统基本满足实际应用需求,为市政道路、井盖巡查提供了一种新的方法。 相似文献
18.
随着我国城市化的迅速发展和城镇人口的不断增加,给公共交通管理与建设提出新的挑战。将丰富的地理信息、(实时)交通信息、人口分布统计信息、社会经济信息等以及最新的地理信息系统(GIS)技术引入公交管理与规划中,并以建筑物或居民区为选址设站与路线规划的研究对象,能大大提高公交管理和规划的智能化与精细化水平,更好地适应公交规划、建设和管理的发展需要,提高公交系统设计的人性化水平。从城市公交查询管理系统建立的必要性出发,分析了基于组件式地理信息系统技术的公交查询管理系统的设计,探讨了关键技术的实现,并总结概括该系统的创新技术特点。 相似文献
19.
汽车运动参数IMU/GPS组合测试中的数据同步技术 总被引：1，自引：0，他引：1
为解决IMU和GPS的数据同步问题,对汽车运动参数IMU/GPS组合测试中的数据同步技术进行了研究.根据GPS和IMU信号的特点,在IMU不提供同步脉冲信号并且不改变它们各自结构的前提下,设计并研制了基于CPLD的同步电路.进行了测量汽车运动参数的试验,行驶路径包括直线和弧线,利用同步电路实现了IMU/GPS数据的同步.试验结果表明该电路能够准确测量同步时差,有效地解决了IMU和GPS数据的时间同步问题;基于该同步电路的IMU/GPS组合测试系统实现了对多种汽车运动参数的高频测量与解算. 相似文献
20.
分析地理信息系统(GIS)、北斗卫星导航、GPS、位置信息服务、移动互联网传输等技术在交通物流中的应用,提出基于移动互联网与GIS的预警图像传输优化方法。物流运输监测预警图像适配视频传感器在动态检测图像上结合Exif信息匹配地理信息坐标位置网点,采用哈夫曼编码进行图像压缩、运动检测算法处理图像冗余,并采用纹理合成的匹配块图像修复失真等方法还原图像数据,最终实现不同空间地理位置的地图查询、路径搜索、位置检索、地图匹配等交通物流过程动态控制,并通过Matlab仿真实验证明了传输优化的可行性。 相似文献