最新刊期
卷 ， 期 4 ， 1992
- 摘要：SCS model is a small basin design flood model proposed by Soil Conservation Service （SCS） of USDA. At rainfall-runoff relationship, SCS model gives consideration to land used, soil type and antecedent soil moisture. Because the model tallies with the actual situation at rainfall runoff computation and is simple in structure, this model finds wide application. But soil classification and Runoff Curve Number （CN） in the model are restricted by region, it isn’t suited to China. In this paper, we propose the formula to calculate the initial abstraction （Ia） and potential maximum retention （S）, as well as the soil type classified by soil texture and application of remotely sensed data. The rationality of improved SCS model is proved by rainfall-runoff calculation in Chuzhou exprimental basin, Anhui province.
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发布时间：2021-06-10 - 摘要：This paper shows the application of IHS color transform and principal component transform for information extraction from TM image in Suzhou study area. It is shown that lan-duse types have characteristic hues on color composites of multispectral data. Based on the hue analysis of water body, vegetation and urban area on TMs（R）, TM4（G）, TM5（B） color composite, the H component is color-sliced, the spatial distribution of the three major landuse types is distinctly demonstrated. On the inverse IHS color transform composite of principal components （PCs）, the information content of PCs is quantitatively and vividly displayed, the spectral difference between the old urban area and the newly developed urban area, the urban status and the feature of contemporary city planning are conspicuously demonstrated. The spectral difference among rice, vegetable and hill forest is also effectively enhanced. The combined use of principal component transform and IHS color transform provides a powerful information extraction tool for multispectral data processing.
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发布时间：2021-06-10 - 摘要：Color composition is simple and useful in image enhancing processing, but is always limited by user’s experence. In this paper a metho of choosing color composition is given which is based on chromaticity. The visual sensitivity to color difference between objects on computer VDP can be caculated in all kinds of possible color composition, then the best choice of color composition can be gained. It is very profitable to apply this method to extract interesting information from images. In Huanghe River mouth there are about four kinds of objects such as Yellow Sea water, Huanghe Water, delta Land and seabeach which basicly determine the enviromental changes and influence the oil industry development. Using Thematic images and choosing best color composition has successfully define the boundaries between objects and provides exact data for further studies.
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发布时间：2021-06-10 - 摘要：In this paper, using NOAA/AVHRR data the information of cloud coverage was extracted for the first time. The regression equation have been established using the mean visible albedo and corresponding monthly mean sunshine durations. Then the features of temporal and spatial distribution of sunshine field in the Ailao mountainous regions have been interpreted. With high space-resolution and large information quantity, the features reflect objectively the spatial and temporal distribution law of light resources under synthetical effect of complex topography （sloping direction, sloping field, river valley, flat etc.） and different vegetation types. A new method and scientific data for making thorough study of light resources in mountainous regions have been provided.
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发布时间：2021-06-10 - 摘要：Digital image processing technique applied to geological exploration is presented in this paper. The data processed are involved with multi-geoscience information such as remote sensing, geology, geophysics, geochemistry and geography. To be directed against the particularity of geoscience information, various methods of digital image processing have been developed in order to enhance and extract the important information used in geological exploration and to assist in geotectonic structural analysis. The preliminary result has been achieved in mineral prediction, demonstrating the potential of digital image processing technology in geological exploration.
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发布时间：2021-06-10 - 摘要：This paper advances and analyzes a series of algorithms for set operations of 2DRE Quadtrees, which changes complicated image operations with high complexity of time and space into a simple arithmatic operations to simplify the solution of some issues through set theory. In this paper, the foundations of the algorithms are introduced first; then the algorithms are described and analyzed in detail; finally, the meaning of the research of data structure and algorithms in application are discussed.
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发布时间：2021-06-10 - 摘要：Most of the radiation measurements in tradiional remote sensing above natural surfaces such as soils or vegetation canopies, consisted of onl nadir reflectance factors. Although such nadir measurements have the advantage of simplicity, the amount of information that can be inferred about the surface is limited mainly to that obtainable from wavelength discrimination and sun incidence angle changes. The result ofrecent studies suggests that multiple view angle may fee used to great advantage in estimating the structure and characteristics of vegetation. This advantage of off-nadir measurements is only beginning to be understood.The major achievements made in this area have been summarized in this paper, and the vegetation canopy reflectance models are reviewed according to the following four categories: geometrical optical models, turbid medium models, hybrid models and computer simulation method. The geometrical models are those that based on geometrical optical theory and the description of canopy/crown contours by some common geometrical patterns like cylinders, spheres, cones and ellipsoids etc. These models are generally applicable to inhomogeneous plant canopies, especially to the sparse canopies. The turbid medium models are developed from the solution of the radiation transfer equation in turbid medium through specifying the canopy elements by small absorbing and scattering particles （plates, discs） with finite size and given spatial orientation and optical properties, and randomly distributed in horizontal layers. This kind of models are prevalently used for the dense, horizontally uniform plant stands （crops, grasses）. The. hybrid models, which are deduced from the combination of the above two kind of models, can represent homogeneous as well in homogeneous canopies. Therefore, hybrid models are expected to have much wider ranges of application. The last kind-computer simulation method can realistically simulate the radiation interaction processes within canopies, and their dependence on various canopy structural parameters.For practical purposes, however, a certain balance between model precision and its computational efficiency is needed since precise models/methods are, as a rule, computationally tedious. It is suggested from the foregoing discussions that comprehensive analytical models may be most useful for extracting the vegetation structural parameters from the canopy reflectance spectrum. Based on the investigation of characteristics of scene directional reflectance spectrum, selection of wavebands being used and inversion of BRDF models, the main processes to quantitatively retrieve plant architectural parameters are deeply discussed. Finally, the approaches to bring the potential advantages of off-nadir observations into effect are described.
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发布时间：2021-06-10 - 摘要：Periodic error commonly appear in restoring uniform motion blurred picture, its appearance degrade the quality of restored image heavily. In this paper, quantitative error analysis of restored image in accordance with several typical restored methods is described. Based on this analysis, two MSE improved methods respe lively from frequency domain & space-domain are given. Experiment results show that these two methods have universal significance in the removal of periodic error disturbance in restored images.
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发布时间：2021-06-10 - 摘要：In the preprocessing of the remotely sensed data acquired by the satellites, the geographical coordinate of the image are determined on the basis of the conversions of the satellite view vectors, and the computation of the scene benchmark geographical coordinate. This paper introduces the computation principles of the scene benchmark coordinate, and a practical methodical design for an operational engineering system of the data preprocessing.
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发布时间：2021-06-10
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