最新刊期
卷 ， 期 3 ， 1997
- 摘要：One of the Focuses of the remote sensing geo-processing, is pointing at the mutual transformations of spatial/temporal information. Namely, to use time series to detect spatial differentiation while to apply spatial trace to identify the temporal changes of phenomenon. Since the earth system is characterized by opening and complexity, these geo-processing always have fuzzy and multi-solutions. The study on the mechanism of remote sensing information mainly utilizes the statistical methods not as robot as the advanced genealogical and dynamic methods. The study on the ground spectrum,especially on the patterns of high spectrum, sees some bright prospect, and much success has been reached when vegional differentiation is employed. The transfer of the remote sensing information between the lithosphere, hydrosphere and biosphere is indeed more profound than the same procedure in the atmosphere to which much research effort has been directed, because the information is somehow attenuated or amplified when it is applied from physical procedure in lab to natural environment. This is the very knowledge that we should obtain more. Current remote sensing application and technology have been bottlenecked by how to fully utilize the information sources of all sorts and to further the knowledge of geo-process, into such applications. For instance, analyses on the remote sensing data from NOAA AVHRR and Japanese ADEOS-1 have not been developed in a pixel-by-pixel manner, while heavily overlapped ground stations in Southeast Asia cause tremendous waste on such information. Global change and regional sustainable development is and will receive increasing concern from the side of the earth system science, especially at the turn of this century. Satellite remote sensing has outstanding contribution to global change studies in the past. Through a full line of analyses such as remote sensing archaeology, deep underground information transfer, image overlapping, cartographic comparison and fractal analysis, remote sensing is capable of reconstructing the historical procedure of both nature and Chinese civilization of 5.000 years. On the basis of more and more such historical evidence being proven, remote sensing shows convincing capability of serving regional sustainable development. As the Internet spread worldwide and China’s information industry rapidly develops, current manipulation on remotesensing information, such as transferring, storing, processing, analyzing and application, is challenged. Around the year 2,000, both airborne and satellite remote sensing image or data will be quali- fled as a multimedia source, completely digitized, flowing on the "infomation super-highway", to serve the society with rapidly captured and updated information. After analyzing the general rule of spatial/temporal transformation of remote sensing information, this paper gives two pieces of advice on the basic steps to develop China’s remote sensing technology: ① to independently speed the experiment on small satellites group, and develop more satellite and airborne remote sensing information sources. ② to meet the requirement of information society. China should keep pace with the development of digital telecommunication network at home and broad, integrate assembly lines of remote sensing information, increase the efficiency and effect such information, and lead the nation to a modernized era.
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发布时间：2021-06-10 - 摘要：This paper mainly focuses on the 2-D phase unwrapping algorithm for Interferometric Synthetic Aperture Rader （INSAR）. The statistical property of error in the phase differences of INSAR （Interferogram） is firstly presented in brief, which shows this error could be assumed to be Gaussian noise. The algorithm of least-square 2-D phase unwrapping using FFT（LS-FFF） is then discussed, and it is proved to have a good property of robustness in Gaussian noise. Finally, the idea of parallel processing for LS-FFT is put forward, and is verified with the computer simulations.关键词：Interferometric synthetic aperture radar（INSAR）;2-D phase unwrapping;Gaussian noise;Least-square;Mirror reflection;Parallel processing
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发布时间：2021-06-10 - 摘要：In-flight experiment of MAIS imaging spectrometer and ground-based measurements using GER MARK-V spectroradio-meter simultaneously with the MAIS overpass were performed during Autumn 1995 at the semiarid area of Inner Monogolia, China. Based on these measurement data and MAIS image data, we designed a method for the radiometric calibration of MAIS sensor and an algorithm for reflectance retrieval from its image using 6S code, and discussed the influences of some factors in the retrieval procedure of surface reflectance. The distinguishing feature of this method is that obtaining simultaneously the surface reflectances of the reference target, atmospheric optical depth and water vapor abundance from the measurement data by only one instrument. The results show that the accuracy of MAIS radiometric calibration is about 8% and the estimated accuracy of the retrieved surface reflectance is about 9.6% in the visible and the near infrared wavelengths （0.4—1.2μm）, i. e., the nearnadir surface reflectance factor is to within about 0.01—0.05 reflectance unit at the reflectance between 3% and 50%. The analysis indicates that the method presented here is suitable to the quantitative analysis of imaging spectral data in China.
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发布时间：2021-06-10 - 摘要：This paper invesgigates the ocean surface wind field detection of a Ku band space-borne scan-scatterometer. The resolution cell extraction method and the wind vector ambiguous solution are presented. The ground and space flight calibrating and scatterometer working characteristics are analyzed. The simulation has shown the effectiveness of wind field detection of this scatterometer and the backscatter model （Moore equation） under homogeneous and whirl wind fields respectively.
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发布时间：2021-06-10 - 摘要：SSM/I data ovor the desert areas of China is studied. Temporal variations of the brightness temperatures TB from SSM/I observations are presented. The polarization index of 37GHz channels is defined as an identification index to detect the desert distribution. Its spatial and temporal variations are discussed. The radiative transfer theory is used to simulate the TB of desert area at SSM/I channels, which includes the effect of atmospheric water vapor, surface roughness, and vegetation coverage, etc. This analysis has developed an useful approach to the desert study in China.关键词：Satellite-born remote sensing;SSM/I;Desert in China
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发布时间：2021-06-10 - 摘要：In this paper the upgrade of a single satellite receiving station into a multimissional one is described. The tracking system and high frequency receiving channel are modified, the acquisition software for the satellites are developed, the IF receiving and demodulating equipment are produced and the whole system is assembled.关键词：Multi-mission remote sensing receiving system;Antenna tracking system;Tunable local frequency generation by frequency synthesizer;Data receiver;Satellite acquisition software
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发布时间：2021-06-10 - 摘要：In this paper, the photograph model of IR-MSS is presented. The model describes the scaner photograph, and includes the effect of the attitute of satellite, the orbit motion, the earth rotation, the earth shape and the Gauss map. The model is used to analyse and estimate the geometry quality and registration of the satellite IR-MSS image.关键词：Image quality;Simulation;IR-MSS
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发布时间：2021-06-10 - 摘要：TM imagery uses 0-255 grey levels to represent different spectrum of the ground truth. In the ease of using TM data to enhance and map mineral bearing alterations, Amos （1989） and Zhao Yuanhong （1991） applied TM ratio+ PCA to enhance alterations with eliminating the influencial factor of vegetation; Crosta （1991） and loughlin （1991） used PCA+ negative+ PCA to successfully identify alterations. However, those methods have unsatisfactory results in the areas where dominanted with forestry、grass、glacial ice、loess、water bodies、and clouds. The new methodology to eliminate those environment factors which have strong spectral reflectance comparing with relative weak spectral reflectance of alterations, and which have impact on spectral signatures of the TM data in terms of differentiating alterations from surrounding rocks is developed mainly by TM data masking-PCA-supervised and unsupervised classification in the testing areas selected both in Canada and China. The results are proved vary effective.关键词：Alterations;Image masking;Supervized and unsupervized classification
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发布时间：2021-06-10 - 摘要：Geosat satellite altimeter can be extensively used to study front, sea surface wind, wave and altitude etc., but it is difficult to use altimetric data to analyze the section structures of sea surface wind and wave in typhoon because of the limits of satellite orbit, typhoon track and wind speed algorithm of altimeter etc.. Based on Geosat altimetric data of wind speed and significant wave height in an ascending track on August 11, 1987, the sectional distribution characteristics of the wind and wave are analyzed under No. 8708 typhoon. The result shows that the section measuring data can be obtained by altimeters whereas it is difficult to be obtained by conventional methods. Making full use of this information on the characteristics study of sea surface wind and wave structure under typhoon will benifit the prevention of typhoon calamity and the study of air-sea interaction in the synoptic process.关键词：Geosat altimeter;Typhoon;Sea surface wind;Significant wave height
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发布时间：2021-06-10 - 摘要：In this paper a tow-layer model for evaportranspiration is estiblished in partial vegetation canopy. The vegetation canopy has two layers, the first one extends. from a refrence height in the atmosphere to the virtual sink for momentum and the second one from the virtual sink to the soil surface. NOAA-AVHRR data and the two-layer model are applied to estimate evaportranspiration and drought of wheat grown in Huang Huai Hai plain.关键词：Two-layer;One-layer;Dought;Partial vegetation canopy
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发布时间：2021-06-10 - 摘要：During 1992—1995, Chinese Academy of Sciences （CAS） and The Ministry of Agriculture organized the project named "National Resources and Environment Remote Sensing Macroinvestigation and Dynamic Study". After three years work, by setting "swift, advanced techniques, new remote sensing data and dynamic study" as the characteristics, the project formed complete methodology; accomplished national resources and environment combined-classification investigation; established "The National Resources and Environment Database", and developed the resources and environment remote sensing dynamic study in typical areas. The success of the project proved the feasibility of developing national resources and environment swift investigation and dynamic monitoring by using remote sensing and GIS techniques. An operating remote sensing-GIS system can provide information of resources and environment swiftly, macroscopically, objectively, and accurately.关键词：remote sensing;GIS;Resources and environment survey;dynamic monitoring
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发布时间：2021-06-10 - 摘要：Solution to many spatial decision-making problems, such as site selection or regional sustainable development, needs Spatial Decision Support System （SDSS） instead of Geographic Information System （GIS） because currently-available commercial GIS software Packages lack those capabilities for spatio-temporal distribution, prediction, simulation of spatial information, and interactive questioning between analysts and decision-makers. This paper summarizes two methods to establish a SDSS software. One is to generate a SDSS by coupling currently-available GIS software with analytic decision models. The other is to develop a true SDSS that has the integrated capabilities for management of spatial data and analytic models. The first method requires a shorter developing period and less cost than the second one. A SDSS based on the second method has a common interface and an integrated data structure, therefore, it is more efficient and easier to be used. The system, Decision Support System of Regional Agricultural Sustainable Development in China （DSSRASD） developed by the authors and our collaborators in 1995, is a true SDSS for agricultural sustainable development. A new data structure, Hyper Graph-based Data Structure （HBDS） is used to establish the base of DSSRASD in Borland C++ for Windows. Furthermore, utilization of remote sensing and multimedia technologies enables the system to be used by decision-makers easily. At present DSSRASD is running well in the three pilot areas （Penglai city and Zhoucun County of Shandong province, Tongshan County of Jiangshu province）. Finally, the prospects of SDSS are discussed.关键词：Spatial decision support system;Integration;Model supporting system;sustainable development
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发布时间：2021-06-10 - 摘要：The focus of this paper is the impact of ground water depth, ground water mineralization rate and geomorphology on soil salinity. The quantitative relationship of this impact was analyzed using a numerical moclel. The results on soil salinization are provided for the Chang Ling experimental region, in Jilin province, China. A GIS support tool was used to combine remotely sensed data and expert advice, with a mathematical model. Good results were achieved from the synthetic analysis. This quantitative method is an effective research tool for analysing salinity problem in soils.关键词：Hydrology;geomorphology;Salinity;GIS;Models;Renote sensing
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发布时间：2021-06-10
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