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81.
????????????λ??T??u,θ??λ???????????????????????????????????????????????T??u,θ??λ???????n???????????????????к?u??????Q??m??n(u)?????????к?θ??λ?????????T??m??n(b,θ,λ)????????????(b?????)???????????????????u,θ,λ??????T????SX??????T??????n??SX?????????????????????У????????????????????????????????????????????????????????????????????е?Q??m??n(u)???SX??????Q??m??n(u??n)??????n??SX??????Δu??????????????Δu=u-b??????????????Δu??????????????????????????????μ?T??m??n(b,θ,λ)????????????????????????????λT??u??R,θ,λ??????????????а?????????????棬?????????????????????????????????????????????????????????????????????ī???????λ????е?????????????? 相似文献
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High spatial resolution and spectral fidelity are basic standards for evaluating an image fusion algorithm. Numerous fusion methods for remote sensing images have been developed. Some of these methods are based on the intensity–hue–saturation (IHS) transform and the generalized IHS (GIHS), which may cause serious spectral distortion. Spectral distortion in the GIHS is proven to result from changes in saturation during fusion. Therefore, reducing such changes can achieve high spectral fidelity. A GIHS-based spectral preservation fusion method that can theoretically reduce spectral distortion is proposed in this study. The proposed algorithm consists of two steps. The first step is spectral modulation (SM), which uses the Gaussian function to extract spatial details and conduct SM of multispectral (MS) images. This method yields a desirable visual effect without requiring histogram matching between the panchromatic image and the intensity of the MS image. The second step uses the Gaussian convolution function to restore lost edge details during SM. The proposed method is proven effective and shown to provide better results compared with other GIHS-based methods. 相似文献
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Effects of the Soil Heat Flux Estimates on Surface Energy BalanceClosure over a Semi-Arid Grassland 下载免费PDF全文
Soil heat flux is important for surface energy balance (SEB), and inaccurate estimation of soil heat flux
often leads to surface energy imbalance. In this paper, by using observations of surface radiation fluxes
and soil temperature gradients at a semi-arid grassland in Xilingguole, Inner Mongolia, China from June
to September 2008, the characters of the SEB for the semi-arid grassland were analyzed. Firstly, monthly
averaged diurnal variations of SEB components were revealed. A 30-min forward phase displacement of soil
heat flux (G) observed by a fluxplate at the depth of 5-cm below the soil surface was conducted and its effect
on the SEB was studied. Secondly, the surface soil heat flux (Gs) was computed by using harmonic analysis
and the effect of the soil heat storage between the surface and the fluxplate on the SEB was examined.
The results show that with the 30-min forward phase displacement of observed G, the slope of the ordinary
linear regression (OLR) of turbulent fluxes (H+LE) against available energy (Rn–G) increased from 0.835
to 0.842, i.e., the closure ratio of SEB increased by 0.7%, yet energy imclosure of 15.8% still existed in the
SEB. When Gs, instead of G was used in the SEB equation, the slope of corresponding OLR of (H+LE)
against (Rn–Gs) reached 0.979, thereby the imclosure ratio of SEB was reduced to only 2.1%. 相似文献
86.
In this paper we present a method for computing the equilibrium structures and various physical parameters of a primary component
of the binary system assuming that the primary is more massive than the secondary and is rotating differentially according
to the law of the w2 = b0 + b1 × s2 + b2 × s4, w being the angular velocity of rotation of a fluid element distant s from the axis of rotation and b0, b1, b2 suitably chosen numerical constants. This method utilizes the averaging approach of Kippenhahn and Thomas (1997) and the
concept of Roche equipotentials in a manner earlier used by Mohan et al. (1997) to incorporate the effects of rotation and
tidal distortions on the equilibrium structures of certain rotationally and tidally distorted stellar models. The use of the
method has been illustrated by applying it to obtain the structures and some observable parameters of certain differentially
rotating and tidally distorted binary systems whose primary component is assumed to be a white dwarf star. 相似文献
87.
本文给出了洱海水体变化对局部重力场影响的解析式和量级,并且将理论结果与实测的水文、流动重力及定点重力分析结果作了比较,结果表明:影响的程度因距洱海的距离而异。在台站重力测量中,由水体变化产生的干扰淹没在零漂之中(约占每日零漂量的2%),潮汐主频段上没有明显的干扰信号;而对流动重力测量,在水体变化大的情况下,部分测点所产生的变化可以达到10×10~(-8)m/s~2。 相似文献
88.
GPS测量目前在三峡库区变形监测应用较为广泛,但常规数据处理中,网平差这一步骤导致了因某点测量误差偏大而导致的整个监测网中其他监测点测量误差偏大,为解决这一问题,介绍了单基线向量解算法,并利用该方法对长屋滑坡2005年3月-2007年3月的监测点数据进行解算,提出了该方法能减少测量误差和内业工作量,并能运用于实际工程。 相似文献
89.
便携式潮汐观测仪(PET)数据处理研究 总被引:1,自引:0,他引:1
介绍了用切比雪夫多项式和最小二乘相结合的数据拟合从重力固体潮观测的秒值提取分钟值和小时值的方法,该方法可以将错误数据自动剔除以得到可靠数据.将提取的数据应用于调和分析,效果良好. 相似文献
90.