共查询到19条相似文献,搜索用时 265 毫秒
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利用LandsatTM、NOAA/AVHRR和中分辨率成像光谱仪(MODIS)三个平台传感器的遥感数据,分别使用训练样本监督分类、阈值数字信号统计、雪盖指数方法制作雪盖图和提取积雪面积。结果表明:不同传感器遥感图像因时相和时空分辨率的差异,提取积雪信息的有效方法有所不同。但基于反射特性的雪盖指数计算法具有普遍的实际操作性意义,即雪盖制图精度高,分类合理,是提取积雪信息的最佳技术手段;当使用监督积雪分类时,只有取得精确的信号文件,分类结果才是可信的;而阈值数字信号统计的雪的阈值确定具有很大的经验性和随机性,但对数据不完整或只有单波段时也不失为有效和简便的途径;山影补偿处理法基本可以消除地形阴影的影响;而去云后其覆盖下的积雪恢复技术值得进一步讨论。 相似文献
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利用LandsatTM、NOAA/AVHRR和中分辨率成像光谱仪(MODIS)三个平台传感器的遥感数据,分别使用训练样本监督分类、阈值数字信号统计、雪盖指数方法制作雪盖图和提取积雪面积。结果表明:不同传感器遥感图像因时相和时空分辨率的差异,提取积雪信息的有效方法有所不同。但基于反射特性的雪盖指数计算法具有普遍的实际操作性意义,即雪盖制图精度高,分类合理,是提取积雪信息的最佳技术手段|当使用监督积雪分类时,只有取得精确的信号文件,分类结果才是可信的|而阈值数字信号统计的雪的阈值确定具有很大的经验性和随机性,但对数据不完整或只有单波段时也不失为有效和简便的途径|山影补偿处理法基本可以消除地形阴影的影响|而去云后其覆盖下的积雪恢复技术值得进一步讨论。 相似文献
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张斌 《中国图象图形学报》2000,5(10):830-835
提出了一种基于图象边缘轮廓信息的多源图象匹配定位方法,其目的是利用定位精度较高的高分辩率遥感图象对低分辨率图象实现子象素级的匹配定位,该方法有效地利用了多源遥感图象中共有的区域结构信息,将特征匹配和最小二乘影象匹配相结合,具有较好的普适性,且运算快速、抗噪性能好,采用该方法进行NOAAAVHRR图象和Landsat TM图象、1:100万数字地图的边缘图象匹配,并应用于NOAA AVHRR图象的几 相似文献
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本文论述了对极轨气象卫星NOAAAVHRR图象进行重采样的必要性,研究了重采样与投影的方法,并利用ERMapper图象处理系统对重采样前后及经过投影处理的彩色图象进行了对比分析。 相似文献
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应用遥感技术进行无资料区积雪动态监测方法的研究 总被引:2,自引:0,他引:2
积雪是重要的水资源,监测技术的改进对无资料区积雪的监测具有重要意义。采用遥感与地理信息系统(GIS)相结合的方法对积雪监测具有极大的潜力。本文通过对西藏某一流域多年资料的研究,证明了这种方法的可行性和优越性。研究结果表明,应用NOAA/AVHRR数据,结合GIS方法,可以准确确定积雪范围,提供积雪面积,同时可以提供高质量的积雪分布图。 相似文献
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全息粒子场再现图象自动分析方法与实现 总被引:2,自引:0,他引:2
全息粒子场再现图象自动分析方法与实现刘雷健,杨静宇,邬永革,刘克(南京理工大学计算机科学系南京210094)AUTOMATICANALYSISSYSTEMOFRETRIEVEDPARTICLEHOLOGRAMS¥LiuLeijian;YangJing... 相似文献
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COLLISIONDETECTIONAMONGMOVINGOBJECTSINMACHININGPROCESSSIMULATIONYangHeming;LuAnsheng;ZhouJiCOLLISIONDETECTIONAMONGMOVINGOBJEC... 相似文献
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C. Domenikiotis N. R. Dalezios A. Loukas M. Karteris 《International journal of remote sensing》2013,34(20):4235-4246
Meteorological satellites are appropriate for operational applications related to early warning, monitoring and damage assessment of forest fires. Environmental or resources satellites, with better spatial resolution than meteorological satellites, enable the delineation of the affected areas with a higher degree of accuracy. In this study, the agreement of two datasets, coming from National Oceanic and Atmospheric Administration/Advanced Very High Resolution Radiometer (NOAA/AVHRR) and Landsat TM, for the assessment of the burned area, was investigated. The study area comprises a forested area, burned during the forest fire of 21-24 July 1995 in Penteli, Attiki, Greece. Based on a colour composite image of Landsat TM a reference map of the burned area was produced. The scatterplot of the multitemporal Normalized Difference Vegetation Index (NDVI) images, from both Landsat TM and NOAA/AVHRR sensors, was used to detect the spectral changes due to the removal of vegetation. The extracted burned area was compared to the digitized reference map. The synthesis of the maps was carried out using overlay techniques in a Geographic Information System (GIS). It is illustrated that the NOAA/AVHRR NDVI accuracy is comparable to that from Landsat TM data. As a result NOAA/AVHRR data can, operationally, be used for mapping the extent of the burned areas. 相似文献
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利用LandsatTM6热红外遥感数据定量反演了干旱地区的地表温度,研究结果表明,区典型地表覆盖类型的地表亮温比地表起初温度低0.4-1K,遥感反演的地面真实温度与当地3月下旬的实测温度误差在0.8K以下,这说明用LandsatTM6定量反演干旱区的地表温度是可行的。研究结果表明,地下水富集带地表温度具有异常现象,其地表温度比地表水体高5K左右,而比其它地表类型低7K以上,据此,可以利用热红外遥感 相似文献
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Images from the NOAA polar orbiting satellites are used to assess the extent of snowcover in the Sierra Nevada mountain range during the 1977 drought year. A real snowcover measurements derived from late April satellite imagery reveal the entire mountain range to have less than one third the snowcover that was present at a comparable date in 1975. Ratios of 1977 to 1975 snowcover for individual basins of the Sierra Nevadas ranged from a low of 1:9 in low elevation watersheds to a high of 1:2 in high elevation watersheds. Reduction of the satellite data was accomplished through the use of a density slicer, a color additive viewer, and an optical rectification device. 相似文献
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The potential of the recent SPOT VEGETATION (VGT) sensor for characterizing boreal forest fires was investigated. Its capability for hotspot detection and burned area mapping was assessed by analysing a series of VGT, NOAA/AVHRR, and Landsat TM images over a 1541 km2 相似文献
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A problem with NOAA AVHRR imagery is that the intrinsic scale of spatial variation in land cover in the U.K. is usually finer than the scale of sampling imposed by the image pixels. The result is that most NOAA AVHRR pixels contain a mixture of land cover types (sub-pixel mixing). Three techniques for mapping the sub-pixel proportions of land cover classes in the New Forest, U.K. were compared: (i) artificial neural networks (ANN); (ii) mixture modelling; and (iii) fuzzy c -means classification. NOAA AVHRR imagery and SPOT HRV imagery, both for 28 June 1994, were obtained. The SPOT HRV images were classified using the maximum likelihood method, and used to derive the 'known' sub-pixel proportions of each land cover class for each NOAA AVHRR pixel. These data were then used to evaluate the predictions made (using the three techniques and the NOAA AVHRR imagery) in terms of the amount of information provided, the accuracy with which that information is provided, and the ease of implementation. The ANN was the most accurate technique, but its successful implementation depended on accurate co-registration and the availability of a training data set. Supervised fuzzy c -means classification was slightly more accurate than mixture modelling. 相似文献
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Mehmet Şahin Bekir Yiğit Yıldız Ozan Şenkal Vedat Peştemalci 《International journal of remote sensing》2013,34(8):2714-2729
In this study, the calculation of vapour pressure deficit (VPD) using the National Oceanic and Atmospheric Administration Advanced Very High Resolution Radiometer (NOAA/AVHRR) satellite data set is shown. Twenty-four NOAA/AVHRR data images were arranged and turned to account for both VPD and land surface temperature (LST), which was necessary to calculate the VPD. The most accurate LST values were obtained from the Ulivieri et al. split-window algorithm with a root mean square error (RMSE) of 2.7 K, whereas the VPD values were retrieved with an RMSE of 6 mb. Furthermore, the VPD value was calculated on an average monthly basis and its correlation coefficient was found to be 0.991, while the RMSE value was calculated to be 2.67 mb. As a result, VPD can be used in studies that examine plants (germination, growth, and harvest), controlling illness outbreak, drought determination, and evapotranspiration. 相似文献
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There are different methods for geometric correction of NOAA AVHRR data, but these methods either pay less attention to the accuracy, or are technically complex, almost unsuitable for most users. To combine AVHRR data with other high spatial resolution satellite data, or with ancillary data in GIS, it is necessary to develop an accurate geometric correction method, which should be easy to use even for non-professional users. After analysing the pixel shape and size of AVHRR 1B data along scan line and evaluating the quality of geographical data of NOAA AVHRR 1B data set, we found that the geographical data was adequately accurate for identifying the pixel size and shape and the method was developed accordingly. The proposed method has two steps. The first step is to correct pixel distortion. The separate program performs the distortion correction, applying the geographical data of AVHRR 1B data set to assigning the value of each pixel of the desired output geographical area with given pixel size, and making logical judgment for unassigned pixel. The second step is to perform conventional polynomial transformation on the results of the first step. An application of this method is presented in the paper. To examine the precision, SAVI images derived from the geometrically corrected NOAA AVHRR band image were used to perform overlay with each other and also with a 1 :50000 river system map. A half-pixel accuracy was achieved. 相似文献