共查询到20条相似文献，搜索用时 185 毫秒
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汪淼 《测绘与空间地理信息》2017,(1)
对如何利用高分一号卫星数据制作假彩色数字正射彩色影像图进行了研究,基于高分一号利用432波段组合,可以突出地显示出植被信息,处理成果纹理细节清晰,无明显噪声,高分一号数据制作的标准假彩色数字正射影像图可以保证数据成果色彩分明,植被提取和解译精度高。 相似文献
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一种国产高分卫星遥感影像变分融合方法 总被引：1，自引：0，他引：1
由于现有全色/多光谱融合方法对国产高分卫星遥感影像数据特点考虑不足,提出一种针对国产高分卫星遥感影像的变分融合方法。该方法充分考虑融合影像波段间光谱关系的保持,构建基于光谱梯度的三维光谱高保真模型,并针对国产高分卫星全色影像存在模糊降质的数据特点,发展顾及模糊降质的空间增强模型。在此基础上,结合影像先验知识建立融合目标函数,最后采用梯度下降法优化求解得到融合影像。通过高分一号(GF-1)和高分二号(GF-2)影像数据对提出的融合方法进行实验验证,并与典型GS,PRACS和ATWT-M3等融合方法分别从定性和定量2方面进行比较分析。实验结果表明,该融合方法充分考虑了国产高分卫星影像数据特点,在对照实验的几种方法中得到了最优的融合结果,可在有效提升多光谱影像空间分辨率的同时,很大程度上保持原有的光谱信息。 相似文献
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付海军 《测绘与空间地理信息》2017,(6):109-112
为分析高分一号WFV传感器16 m遥感影像在水质反演方面的能力,本文选取南四湖为研究区,以高分一号卫星影像与Landsat-8卫星OLI影像为数据源,结合地面同步实测水体浊度数据,建立反演水体浊度的原始光谱反射率模型、归一化反射率模型和波段比值模型,并对各模型进行精度评价,分别比较两个传感器在浊度反演能力方面的差异。结果表明:利用高分一号WFV 16m遥感影像进行水质反演具有较高的精度,且具备更高的空间分辨率和更短的重访周期,可以替代Landsat-8多光谱数据。 相似文献
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主要介绍了正射影像的生产方法 ,并结合WorldView-2、资源三号、高分一号卫星影像采用RPC模型进行正射纠正,并根据已有的DLG数据进行精度分析、质量分析。 相似文献
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《遥感学报》2020,(5)
正封面图片为2020-01-11高分四号卫星获取的澳大利亚森林火灾影像,利用着火点自适应阈值检测方法生成的森林火灾监测结果图,空间分辨率为400 m。高分四号卫星是中国首颗地球静止轨道高分辨率对地观测光学遥感卫星,具有普查、凝视、区域、机动巡查4种工作模式,其搭载的全色/多光谱相机(简称PMS)空间分辨率优于50 m,单景成像幅宽优于500 km,中波红外相机(简称IRS)空间分辨率优于400 m,单景成像幅宽优于400 km。高分四号卫星可以提供中国全境和周边国家的高时效、高分辨率的观测数据,能以分钟级甚至秒级间隔进行高频率拍摄,为中国及周边区域的灾害风险预 相似文献
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遥感影像融合是目前遥感领域最主要的研究方向之一,为了进一步促进遥感影像的广泛运用,本文通过高分一号卫星(GF-1卫星)获取湖南省浏阳市部分流域遥感影像,从平均梯度、信息熵、相关系数、地物识别精度等方面定量分析了该卫星传感器的高分数据和多光谱数据融合的质量,试验结果表明:影像融合过程中Gramschmidit融合变换效果最好。 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