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11.
川西北高原若尔盖草地沙化及湿地萎缩动态遥感监测 总被引:61,自引:2,他引:61
应用卫星遥感资料(MSS、TM及spot)对川西北高原若尔盖草地沙化及湿地萎缩的动态监测发现,自1966年至2000年的34年间,草地沙化面积增加307.7%,达到36760.9hm^2,占区域总面积的7.25%,平均每年扩大草地沙化面积816.0hm^2,年均递增率达4.22%。到2000年止,区域内有沙地5083.9hm^2,沙化草地31677.0hm^2。自1985~2000年的15a间,区内17个湖泊面积缩小842.0hm^2,减幅达38.9%,平均每年减少56.1hm^2,年均递减速度达3.34%,该区目前其余11个湖泊总面积仅为1323.1hm^2,只有15年前的61.1%。 相似文献
12.
用空间分辨率为1km的MODIS和MISR数据可计算16天BRDF和反照率产品,该文证明了在多数采样条件下,用MODIS/MISR角度采样的BRDF和反照率反演精度在5到10个百分点以内。 相似文献
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Saturated and aromatic biomarker ratios continue to change systematically through the oil window and into the gas-condensate window to high vitrinite reflectances (Ro = 1.16%) in mature marine and lacustrine Mesozoic clastic samples from a South African basin. Two of the ratios reverse above Ro = 0.9%. These unusual maturation effects result from isolated periods of high rates of maturation increase. The basin cooled regionally after the break-up of Gondwana but high heating rates prevailed during the late Cretaceous-early Tertiary, as Africa moved across a hotspot, and again in the late Tertiary as a result of a possible hotspot and hydrothermal event. 相似文献
15.
植被冠层多角度遥感研究进展 总被引:7,自引:0,他引:7
综述了近年来关于植被冠层多角度遥感研究的最新成果,分别讨论了二向性反射的正向模型和参量反演问题在理论和实际应用中的新进展。分析了卫星平台多角度遥感的应用前景及面临的困难,指出了未来多角度遥感研究的新方向。 相似文献
16.
碳酸盐岩的反射光谱特征的研究及应用 总被引:2,自引:0,他引:2
在室内对新疆塔里木盆地西北缘柯坪地区碳酸盐岩的反射光谱进行了测量。分析结果表明:碳酸盐岩的特征吸收谱带位于2300~2350nm,随着碳酸盐岩中Mg2+含量的增加,其特征吸收谱带的中心波长位置具有向短波长方向移动的特点;同时,随着碳酸盐岩中碳酸盐矿物含量的增加,其特征吸收谱带的深度(D)也有增大的趋势,并且岩石的平均反射率(R)也随着增高。根据这些特征可以判定碳酸盐岩的岩石类型及碳酸盐矿物的相对含量 相似文献
17.
VICARIOUS RADIOMETRIC CALIBRATION OF SATELLITE FY-ID SENSORS AT VISIBLE AND NEAR INFRARED CHANNELS
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ZHANG Yuxiang QIU Kangmu HU Xiuqing RONG Zhiguo ZHANG Lijun 《Acta Meteorologica Sinica》2004,18(4):505-516
For the problem of in-flight test site radiometric calibration for the FY-1D Meteorological Satellite onboard sensor's visible and near infrared channels,this paper described the calibration method,satellite-ground synchronous observation data acquired at China Dunhuang Calibration Test Site,parameter derivation and radiative transfer computation during the calibration,and the calibration result analysis.At FY-1D seven channels (with central wavelength at Channels 1:630 nm,2:865 nm;6:1610 nm;7:455 nm,8:505 nm;9:555 nm;10:932 nm),calibration coefficients obtained during the ground site calibration were compared with that respectively of prelaunch calibration.It is demonstrated that results of FY-1D onboard two sensors' (A and B) at channels 1,2,6 and 10 were close to pre-calibration,and the absolute difference of Gobi desert reflectance computed using test site and pre-launch calibration coefficients was no more than 2%. At other channels,large pre-launch calibration errors resulted in a poor consistency between the test site and pre-launch calibration.The errors can be corrected by the test site calibration results. Based on a rough estimation,the overall error of the calibration was about 6%. The paper also presented the in-flight vicarious calibration at the visible and near infrared channels of FY-1C sensor A which was launched in 1999 and has been put into operational mode since 2002.The results exhibit that FY-1C sensor's response has 23% attenuation at Channels 7 and 8,while only minor degradation at the other channels was found. During the mission,calibrations were also conducted at NOAA-17's Channels 1 and 2 (1:430-830 nm,2:500-1072 nm).A very good consistency has been achieved between the test site and pre-launched calibration results. 相似文献
18.
YAN Shouxun Laboratory of Remote Sensing Information Sciences Institute of Remote Sensing Applications Chinese Academy of Sciences Beijing China 《中国科学D辑(英文版)》2004,47(9)
To examine the application potential of hyperspectral remote sensing techniques in classifying very low-grade metamorphic belts, the composition of clay minerals and the cyrstallinity of illite from mudstones were measured using XRD and VIS-SWIR (400-2500 nm) reflectance spectroscopy. Based on the illite cyrstallinity, Kubler Index (KI), the Early Triassic LuoLou Group and the Middle Triassic lower Baifeng Formation were classified as the lower Epizone with KI△2θ° ranging from 0.22 to 0.25, the upper Baifeng Formation as upper anchizone with KI△2θ°ranging from 0.26 to 0.33, and the Hekou Formation as lower anchizone with KI△2θ° ranging from 0.38 to 0.40. According to a KI△2θ° value of 0.43, it is possible that there may exist a local diagenetic zone in the upper strata. The illite cyrstallinity Kubler index and the metamorphic grade increase from the bottom to the top of the stratigraphic sequence. The metamorphic grade boundaries nearly match the stratigraphic boundaries, indicating a burial metamorphism nature for the stratigraphic sequence. From the bottom to the top of the sequence, the spectral absorption band center of clay minerals from fresh rocks is around 2200 nm. The absorption band centers change towards shorter wavelengths: the Luolou Group being at 2220 nm, the Baifeng Formation at 2217-2213 nm, the lower member of the Hekou Formation at 2214-2206 nm, and the upper member of the Hekou Formation at 2205-2197 nm. The spectral absorption band center of illite shows the same change pattern. These results indicate that very low-grade metamorphic belts can be subdivided using spectral indices of clay minerals, which are measured by using field portable spectroradiometers. However, it may not work well with satellite and airborne sensors. 相似文献
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一种改进的MODIS影像BRDF辐射校正方法 总被引:7,自引:0,他引:7
针时二向性造成的辐射失真,在核驱动模型的基础上提出了一种改进的二向性反射分布模型,并通过时MODIS影像的试验,得到了减弱辐射差异的较好效果,并对试验结果进行了分析和评价。 相似文献