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在讨论了MODIS中分辨率成像光谱仪(Moderate Resolution Imaging Spectroradiometer)遥感图像几何畸变的成因后,文章引入了利用MODIS数据间的互补性去除这种"双眼皮"现象的概念,其后采用了Kriging插值的方法对数据进行重采样.在与其他几何纠正和插值方法进行比对后结果表明,该方法能较好地去除边缘重叠影响,并能保持原有云图的特征和信息,对MODIS资料数据在后续的反演工作中有一定意义. 相似文献
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以印度洋北部海域为研究区域,分别从地理位置、温度曲线和反演精度3 个方面对AQUA 卫星上的MODIS 和
AMSR-E反演的海表温度特征进行了对比分析。其主要特征表现为MODIS SST 与AMSR-E SST 之间的差异随纬度变化较为
明显;在近岸区域,AMSR-E SST无法获得准确的海表面温度;MODIS SST 与AMSR-E SST 之间的差异随温度而不同;在本
次研究中,AMSR-E SST 反演精度总体优于MODIS SST。本次研究结果对利用热红外遥感和被动微波遥感进行海洋表面温度
的定量反演具有重要的参考价值。 相似文献
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采用CART决策树方法从MODIS卫星遥感数据反演海冰面积,同时对可见光、近红外和热红外多波段进行自动分类计算,有效消除了传统阈值法在反演高悬沙等海洋环境时出现的海冰误判。经较高分辨率的中国环境与灾害监测预报小卫星(HJ-1A/1B)校验,结果表明基于决策树方法所得出的反演数据具有较高精度。利用建立的CART决策树方法反演了2003年以来辽东湾冬季海冰面积的生消变化过程,为进一步分析和建立气象因素与海冰演化规律的关系提供了精确可靠的基础资料。 相似文献
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采用星星交叉检验方法,比对了VIIRS和MODIS在中国渤海遥感反射率获取能力。由对比结果得出:在近岸海区VIIRS和MODIS观测能力相似,在浑浊水体VIIRS的遥感反射率高于MODIS。同时基于2012年9月辽东湾航次获取的现场遥感反射率数据对VIIRS在渤海海区的反演能力进行了星地检验。结果表明:VIIRS在中国近岸二类水体的反演效果较好,但出现了低估现象,在反演精度上,VIIRS卫星Rrs产品的反演误差远离近红外波段而增大,随水体悬浮颗粒浓度的增加而增大。 相似文献
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以2001~2005年MODIS数据为信息源,每年选取高潮位和低潮位两个时相的MODIS数据,根据滩涂对MODIS 250 m分辨率可见光和近红外探测波数的光谱反应特性,采用波段比值算法来监测福建省海岸带的滩涂面积,并对监测结果用罗源湾和福清湾30 m分辨率的Landsat-7/ETM+影像进行验证分析,结果表明,MODIS数据的观测时间与海洋高低潮位时刻比较接近,便于对滩涂资源的遥感监测.用MODIS数据计算的滩涂面积比用高分辨率的Landsat-7/ETM+数据计算的偏高.卫星遥感监测结果表明从1986至2001年福建省海岸带滩涂面积减少了107 km2,并且从2001至2005年滩涂面积也呈现逐年下降的趋势. 相似文献
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本文介绍了静止卫星数字云图特点，接收处理硬件系统及开发的运行软件。该业务系统提供了准确清晰的高质量图象，提高了预报时效。 相似文献
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基于MODIS数据的2016年黄海绿潮灾害动态监测研究 总被引：3，自引：1，他引：2
本研究利用高分辨率的GF-1卫星影像对MODIS数据绿潮监测的精度进行验证, 并在此基础上利用MODIS数据对2016年黄海绿潮过程进行连续动态监测, 结果表明: 相较于GF-1卫星影像,MODIS数据对绿潮的监测误差高于50%; 2016年黄海绿潮移动路径总体呈先向北, 然后沿山东半岛海岸线向东北方向移动, 并最终停滞于青岛、威海附近海域; 此次绿潮持续时间为80天左右, 并呈现出与往年类似的“出现→发展→暴发→治理→消亡”的规律; 其中“出现”的时间为5月12日, “发展”阶段时间为5月中下旬, 此时绿潮主体分布于苏北浑水区, 适宜前置打捞治理, 当5月底6月初绿潮进入清水区之后才开始进入“暴发”阶段, 本年度绿潮灾害“暴发”规模较大, 对山东沿海水产养殖业及旅游业影响严重。本研究成果对于绿潮预警和防控具有科学和实际意义。 相似文献
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The HY-1A satellite is the first oceanic satellite of China. During the winter of 2002～2003, the data of the HY-1A were applied to the sea ice monitoring and forecasting for the Bohai Sea of China for the first time. The sea ice retrieval system of the HY-1A has been constructed. It receives 1B data from the satellite, outputs sea ice images and provides digital products of ice concentration, ice thickness and ice edge, which can be used as important information for sea ice monitoring and the initial fields of the numeric sea ice forecast and as one of the reference data for the sea ice forecasting verification. The sea ice retrieval system of the satellite is described, including its processes, methods and parameters. The retrieving results and their application to the sea ice monitoring and forecasting for the Bohai Sea are also discussed. 相似文献
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The HY-1A satellite is the first oceanic satellite of China. During the winter of 2002-2003, the data of the HY-1A were applied to the sea ice monitoring and forecasting for the Bohai Sea of China for the fhst time. The sea ice retrieval system of the HY-1A has been constructed. It receives 1B data from the satellite, outputs sea ice images and provides digital products of ice concentration, ice thickness and ice edge, which can be used as important information for sea ice monitoring and the initial fields of the numeric sea ice forecast and as one of the reference data for the sea ice forecasting verification. The sea ice retrieval system of the satellite is described, including its processes, methods and parameters. The retrieving results and their application to the sea ice monitoring and forecasting for the Bohai Sea are also discussed. 相似文献
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MODIS渤海海冰遥感资料反演 总被引：9，自引：0，他引：9
鉴于渤海海冰监测和预报对海冰卫星遥感数字化产品的迫切需求,本文利用MODIS的1B级数据进行渤海海冰参数反演,提供海冰遥感图像和海冰密集度、冰厚数值产品,作为渤海海冰监测和海冰数值预报初始场的重要信息来源,以及海冰预报质量检验的参考依据之一。反演结果表明,其各通道对海冰性质有很好的反映,资料信号比较稳定,对不同密集度和厚度的冰有较好的区分,相对NOAA/AVHRR和HY-1A资料有更好的实际应用价值;Terra/MODIS和HY-1A/COCTS海冰遥感反演结果对比也为HY-1A系列卫星海冰遥感的改进和提高提供有益的启示。 相似文献
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茂名海域水体表层悬浮泥沙浓度时空分布特征的遥感分析 总被引：3，自引：0，他引：3
利用Gorden关系式,从茂名海域的多时相卫星影像定量反演了表层悬浮泥沙浓度的时空分布特征。经近期该海域实测悬沙资料验证表明,茂名沿海水体表层悬浮泥沙浓度偏低,一般低于200 mg/L;表层悬浮泥沙浓度在空间尺度上由岸向海呈带状分布,并逐渐降低,其中-1 m以浅区悬沙浓度最高,一般可超过100 mg/L,-10 m以深区浓度最低,一般低于20 mg/L。此外,沿海水体表层悬沙浓度往往在冬季高于夏季,大风天气高于平常天气。 相似文献
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Variability of Sea Surface Circulation in the Japan Sea 总被引：3，自引：0，他引：3
Composite sea surface dynamic heights (CSSDH) are calculated from both sea surface dynamic heights that are derived from altimetric data of ERS-2 and mean sea surface that is calculated by a numerical model. The CSSDH are consistent with sea surface temperature obtained by satellite and observed water temperature. Assuming the geostrophic balance, sea surface current velocities are calculated. It is found that temporal and spatial variations of sea surface circulation are considerably strong. In order to examine the characteristics of temporal and spatial variation of current pattern, EOF analysis is carried out with use of the CSSDH for 3.5 years. The spatial and temporal variations of mode 1 indicate the strength or weakness of sea surface circulation over the entire Japan Sea associated with seasonal variation of volume transport through the Tsushima Strait. The spatial and temporal variations of mode 2 mostly indicate the temporal variation of the second branch of the Tsushima Warm Current and the East Korean Warm Current. It is suggested that this variation is possibly associated with the seasonal variation of volume transport through the west channel of the Tsushima Strait. Variations of mode 3 indicate the interannual variability in the Yamato Basin. 相似文献
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海冰厚度是监测与研究渤海海冰的重要参数。为了获取更加可靠的渤海海冰厚度数据,本研究基于MODIS数据对海冰厚度反演中的冰水分离环节和冰厚计算方法都进行了改进。对于冰水分离环节,本文在Canny边缘检测算子提取海冰基础上,加入了二值化处理、阈值判别等步骤,实现了较高精度的渤海海冰范围自动化提取。通过试验确定了海冰厚度与反照率指数关系模型中的参数,包括海冰衰减系数和海水反照率参数,使其更加符合渤海海区的物理特征。将改进后算法的海冰厚度反演结果与渤海海上石油平台实测数据进行比较,并分析了误差来源。结果表明,经过对算法的改进,海冰厚度与反照率指数关系模型的反演结果与实测数据之间的平均绝对误差由7.05 cm缩小到2.74 cm,相关系数由0.434提高到0.485。 相似文献
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This paper summarizes the results of perennial combined satellite monitoring of the Black Sea conducted in order to detect sea-surface oil and oil-product pollution, as well as biogenic and anthropogenic surfactant films. A joint analysis of data obtained by various remote sensing techniques has been performed. The large amount of data has resulted in generalizations and reliable statistics on the spatial and temporal variability of different film manifestations in radar images of the sea surface. Regions most severely polluted by petroleum products have been identified. A hypothesis is suggested linking the surface manifestations of certain types of polluting films with natural gas and oil seeps and mud volcanism in the Black Sea. Improvements in the reliability of interpreting satellite data are discussed. 相似文献
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利用卫星资料分析黄海海表温度的年际与年代际变化 总被引：1，自引：0，他引：1
海表温度长期变化在一定程度上反映了海域的气候变化信号,卫星遥感资料是获取高时空分辨率水温长期变化的有效手段。基于国家海洋局1982—1999年黄海断面监测器测数据的2 954组水温数据对时空匹配的卫星(NOAA/AVHRR)反演海表温度(SST)进行校验,计算得到卫星反演SST系统偏差为(0.18±1.00)℃。卫星反演的水温空间分布以及长期变化趋势与器测趋势较为一致,可以用来研究海域SST长期变化规律。利用校验后1982-01～2011-08NOAA/AVHRR的SST数据,分析了该时段黄海冬夏季代表月2、8月海表水温的变化规律。结果显示:(1)近30a,黄海冬季水温有2次跃迁:1989—1990年由冷至暖的状态跃迁,2000-2001年出现由暖至冷的状态转变;1990年代冬季水温达最高,相比1880年代,水温升高1.07℃,新世纪水温稍有降低,水温较1990年代下降了0.53℃,温度变化较大区域位于北黄海、山东半岛沿岸,苏北浅滩毗邻海区,该区SST与局地经向风场存在显著正相关,且北极涛动通过影响冬季风间接影响黄海水温变化;(2)夏季海表水温在1994—1995年呈现由冷至暖的状态跃迁,冷、暖期水温相差0.57℃,水温变化较显著的区域为黄东海分界处,其具体变化机制需深入研究。 相似文献
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Kuh Kim Yun Bae Kim Jong Jin Park SungHyun Nam Kyung-Ae Park Kyung-Il Chang 《Ocean Science Journal》2005,40(1):25-44
Long-term, continuous, and real-time ocean monitoring has been undertaken in order to evaluate various oceanographic phenomena
and processes in the East/Japan Sea. Recent technical advances combined with our concerted efforts have allowed us to establish
a real-time monitoring system and to accumulate considerable knowledge on what has been taking place in water properties,
current systems, and circulation in the East Sea. We have obtained information on volume transport across the Korea Strait
through cable voltage measurements and continuous temperature and salinity profile data from ARGO floats placed throughout
entire East Sea since 1997. These ARGO float data have been utilized to estimate deep current, inertial kinetic energy, and
changes in water mass, especially in the northern East Sea. We have also developed the East Sea Real-time Ocean Buoy (ESROB)
in coastal regions and made continual improvements till it has evolved into the most up-to-date and effective monitoring system
as a result of remarkable technical progress in data communication systems. Atmospheric and oceanic measurements by ESROB
have contributed to the recognition of coastal wind variability, current fluctuations, and internal waves near and off the
eastern coast of Korea. Long-term current meter moorings have been in operation since 1996 between Ulleungdo and Dokdo to
monitor the interbasin deep water exchanges between the Japanese and Ulleung Basins. In addition, remotely sensed satellite
data could facilitate the investigation of atmospheric and oceanic surface conditions such as sea surface temperature (SST),
sea surface height, near-surface winds, oceanic color, surface roughness, and so on. These satellite data revealed surface
frontal structures with a fairly good spatial resolution, seasonal cycle of SST, atmospheric wind forcing, geostrophic current
anomalies, and biogeochemical processes associated with physical forcing and processes. Since the East Sea has been recognized
as a natural laboratory for global oceanic changes and a clue to abrupt climate change, we aim at constructing a 4-D continuous
real-time monitoring system, over a decade at least, using the most advanced techniques to understand a variety of oceanic
processes in the East Sea. 相似文献