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本文介绍了将NOAA/AVHRR图像数据扩展用于江汉盆地油气资源遥感勘查。将AVHRR的波段5(红)、波段2(绿)、波段1(蓝)假彩色合成的图像能清楚地了解江汉盆地周缘的宏观构造轮廓;取AVHRR的波段1,波段2,波段4作非监督处理分32类,得到该盆地较稳定的湖相沉积范围(即主要的生油岩区);取AVHRR的波段1,波段2和波段5作非监督处理分出了32类,并结合TM资料发现了该盆地3条基底断裂线性构造;用视热惯量制图,了解到该盆地主要的油气区段的视热惯量介于该盆地视热惯量分布的最高与最低之间。 相似文献
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松辽盆地西部斜坡区烃渗漏蚀变信息遥感探测 总被引:2,自引:0,他引:2
使用陆地卫星ETM+7图像对松辽盆地西部斜坡区进行稠油探测,图像增强方法有主成分分析、波段比值和假彩色合成等.主成分因子1,3,4,5-PC3(1,3,4,5主成分分析的第3主成分),1,3,5,7-PC3,2,3,5,7-PC3和3,4,5,7-PC4与波段比值3/1,4/3,7/5和(4/3)-(2/3)等用丁假彩色合成,在合成影像上圈定烃渗漏蚀变区域.结果表明烃渗漏蚀变区域与地质背景密切相关,与下伏油藏的分布大致相符. 相似文献
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峰丛洼地遥感图像山体阴影缺失的克里格修复 总被引:1,自引:0,他引:1
为了解决岩溶区峰丛洼地遥感图像山体阴影区域信息“缺失”的问题,以广西壮族自治区平果县果化镇生态重建示范区典型峰丛洼地的遥感图像为例,利用地统计学的方法分析了ETM图像B3,B4,B5波段的灰度值(digital number,DN)结构特征,对3个波段阴影区域的DN值进行了修复与验证.结果表明:研究区峰丛洼地3个波段的DN值主要受内在因子的作用,有显著的空间自相关性,自相关距离都在360 m以上;各波段验证值与修复值之间都具有极其显著的相关性,平均相对误差均在0.2%以下,具有较高的修复精度;峰丛洼地山体阴影缺失信息的修复可为岩溶区生态环境监控、石漠化评估等遥感解译精度的提高提供参考. 相似文献
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SAR影像与TM影像的几种融合处理方法 总被引:13,自引:2,他引:11
利用彩色空间变换、比值变换及相关系数法分别对SAR影像与TM3 、TM4 、TM5 三波段影像进行融合处理。文章介绍了影像融合中的具体技术问题及其处理方法。因侧视雷达图像一般有明显的孤立噪声,所以,在进行影像融合处理之前,先对SAR影像进行预处理,文中用δ滤波法抑制孤立噪声(光斑) .最后,从视觉效果、熵、平均梯度值以及标准差等4 方面评价了影像融合的质量。 相似文献
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海底自然烃渗漏在海洋表面形成的油膜分布对海上油气勘探具有重要指示意义。本文利用3 m分辨率的RadarSAT-2数据在渤海海域开展海洋表面油膜检测同步现场试验,利用机油在海面生成表面油膜,14 min后接收SAR数据,测量并分析海洋表面油膜雷达响应特征。试验结果表明,在适合海况条件下,3 m分辨率SAR数据可以检测到几个微米厚度的表面油膜,此时C波段对海洋表面波有5 dB的阻尼作用。油膜漂移的SAR测量结果进一步证实表面油膜的扩散与漂移受风场、流场影响。 相似文献
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Trend analysis of the Pathfinder AVHRR Land (PAL) NDVI data for the deserts of central Asia 总被引:4,自引:0,他引:4
We analyzed spatially averaged normalized difference vegetation index (NDVI) time series from the Pathfinder Advanced Very High Resolution Radiometer (AVHRR) Land (PAL) dataset of 11 desert and semidesert ecoregions in central Asia using standard statistical tests for discontinuities and trends. Results from the test for discontinuities reveal that seven ecoregions display significant differences in the data acquired by the AVHRRs on the National Oceanic and Atmospheric Administration satellite 11 (NOAA-11) versus the data acquired by AVHRR on other NOAA satellites (NOAA-7, NOAA-9, and NOAA-14). Across the more than 2/spl times/10/sup 6/ km/sup 2/ of deserts and semideserts in the selected central Asian ecoregions, a significant upward trend in NDVI is evident during the tenure of NOAA-11 (1989-1994). This trend is not found during any other period. We argue that the data from the PAL NDVI dataset for NOAA-11 will pose problems for land surface change analyses, if these significant sensor-related artifacts are ignored. We do not find these artifacts in data from the other three satellites (NOAA-7, NOAA-9, and NOAA-14). We suggest that the comparison of data from any combination of these three AVHRRs can be used for land surface change analyses, but that the inclusion of NOAA-11 AVHRR NDVI data in trend analyses may result in the detection of spurious trends. 相似文献
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以TM/ETM 热红外波段为基本分析数据,通过数据处理得到武汉市城区及其近郊可对比的热红外像对辐射值,提取了研究区建筑物、绿地及水体等下垫面信息。在此基础上,对研究区1988年和2002年的热场时空分布和变化特征进行了分析,指出研究区热场影响因素按作用大小依次为建筑物、绿地和水体。同时表明,采用热辐射较为稳定的水体DN值对热红外波段数据做规范化处理,所得热辐射相对值具有很好的时空可对比性。 相似文献
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B. Poovalinga Ganesh S. Rajendran A. Thirunavukkarasu K. Maharani 《Journal of the Indian Society of Remote Sensing》2009,37(1):1-8
Uncertainties in Geovisualaization / GIScience spatial data can minimize but not completely provided by the different image
processing classification methods. The methods of image processing techniques are purely dependent on spectral signature values.
In the present study, we collected end member spectral values from both satellite data and field signatures and applied in
supervised and fuzzy classification of image processing techniques to discriminate the iron ore formations and associated
land cover features of part of Godumalai hill region of Salem District, Tamil Nadu State, India. The result of analysis shows
that the fuzzy classified image discriminated the iron formation with better appearance and distinct boundary between the
associated features than the analyses results obtained by supervised methods. 相似文献
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结合有关项目数据处理的需要,对02C卫星影像特征进行科学分析与应用研究。通过对影像信息量特征、配准特征及融合特征分析,发现岩石裸露区影像各波段信息量大,但是波段间相关性强,地类边界模糊,而植被覆盖区影像各波段信息量相对较小,波段间相关性较小,地类可分性较好;MUS影像与PAN影像配准精度一般能达到1个像元,而MUS影像与HRC影像配准比较困难,HRC影像需要正射校正或者强制拉伸,才能满足精度要求;主成分分析方法融合效果比较好,MUS影像与HRC影像融合效果优于MUS影像与PAN影像融合。分析结果表明:02C数据适用于土地覆被调查,若用于地质信息解译,需要进一步技术处理;HRC影像分辨率高,但数据处理方法有待于进一步探讨。 相似文献
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按照油气微渗漏理论, 利用TM数据同已知油气田进行相关分析, 优选波段变量组合, 进行图像处理, 可以获得和建立反映油气水分布主趋势的色调异常影像模式。这些色调异常的形成, 除了与油气圈闭相伴的油田水类型及总矿化度有关外, 同时还受地貌和地表、地下水排泄条件、第四条沉积、植被等因素影响和干扰。在相同含油气条件下的不同地物具有相同的色调显示, 在不同含油气条件下的相同地物却具有不同色调特征, 因此, 遥感图像上的色调异常必然具有一定的多解性。为了减少单一色调异常的多解性, 必须同时利用遥感图像中的线性体和环形构造信息, 建立油气圈闭的线性体-环形构造-色调异常影像模式进行油气预测。 相似文献
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B. M. Bogachkin Yu. V. Nechayev Ye. A. Rogazhin B. N. Khovanskiy P. N. Yazev 《地理信息系统科学与遥感》2013,50(2):171-184
Soil salinity is one of the most important problems affecting Egyptian soils. It is caused by: (1) a rising water table, or (2) the misuse of the irrigation water. Two Landsat images acquired in 1987 and 1999 were used to detect and monitor soil salinity over the Siwa Oasis, Western Desert, Egypt. DN values of these images were converted to percent reflectance. Inspection of Landsat images revealed that saline soils had an overall higher spectral reflectance in all spectral bands except the two MIR bands. The reflectance curves of saline soils show a strong relationship between the existence of salts in the soil and the difference between bands 4 and 5. A salinity index (SI) was calculated for both images. The majority of pixels in the 1987 image have salinity index values ranging between 0 and 0.2, whereas the values in the 1999 image histogram ranged between 0 and 0.4. These values indicate that soil salinity has increased twofold during the 12 years spanning the imagery. These values show a strong correlation with vegetation index images, in which the 1999 vegetation index image reveals the appearance of surface water lakes formed due to a rising water table. This study presents a model for the identification of soil salinity using remote sensing measurements in conjunction with piezometer readings taken during the time of image acquisition. 相似文献
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The U.S. Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center routinely produces and distributes a remote sensing phenology (RSP) dataset derived from the Advanced Very High Resolution Radiometer (AVHRR) 1-km data compiled from a series of National Oceanic and Atmospheric Administration (NOAA) satellites (NOAA-11, −14, −16, −17, −18, and −19). Each NOAA satellite experienced orbital drift during its duty period, which influenced the AVHRR reflectance measurements. To understand the effect of the orbital drift on the AVHRR-derived RSP dataset, we analyzed the impact of solar zenith angle (SZA) on the RSP metrics in the conterminous United States (CONUS). The AVHRR weekly composites were used to calculate the growing-season median SZA at the pixel level for each year from 1989 to 2014. The results showed that the SZA increased towards the end of each NOAA satellite mission with the highest increasing rate occurring during NOAA-11 (1989–1994) and NOAA-14 (1995–2000) missions. The growing-season median SZA values (44°–60°) in 1992, 1993, 1994, 1999, and 2000 were substantially higher than those in other years (28°–40°). The high SZA in those years caused negative trends in the SZA time series, that were statistically significant (at α = 0.05 level) in 76.9% of the CONUS area. A pixel-based temporal correlation analysis showed that the phenological metrics and SZA were significantly correlated (at α = 0.05 level) in 4.1–20.4% of the CONUS area. After excluding the 5 years with high SZA (>40°) from the analysis, the temporal SZA trend was largely reduced, significantly affecting less than 2% of the study area. Additionally, significant correlation between the phenological metrics and SZA was observed in less than 7% of the study area. Our study concluded that the NOAA satellite orbital drift increased SZA, and in turn, influenced the phenological metrics. Elimination of the years with high median SZA reduced the influence of orbital drift on the RSP time series. 相似文献