最新刊期
卷 ， 期 2 ， 1997
- 摘要：Byusingtheexperimentaldataofmicrowaveactive /passiveremotesensingand measurementsofgroundtruthtotraintheartificialneuronnetwork （ANN） ,aANNmodelforretrievalof biomassparametersisdeveloped TheANNmodelwasfirsttrainedbythedataofwheatcanopyin 1 988 This ANNmodelwasthenusedtoretrievebiomassparametersofwheatcanopyduringgrowthin 1 989 Theretrieval resultsarewellcomparedwiththegoundtruthdata
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发布时间：2021-06-10 - 摘要：Cross radiation is an important part of atmospheric effect in remote sensing data The analysis of its effect in a slant viewing angle is significant,especially to the multi-angle remote sensing which obtain surface data through several scan angles This is also the domain rarely mentioned in the existing atmospheric correction models Atmospheric cross radiation effect can be described by the point spread function（PSF）,whereas by the modulation transfer function（MTF）in the frequency domain We can specify and correct that effect by analysing those two functions In our research,we discover that the cross radiation is related not only to the atmospheric optical depth and image resolution,but also to the scan angle This paper provides its analytical expression and concludes some regularities关键词：multi-angle remote sensing;Atmospheric cross radiation effect;PSF;MTF
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发布时间：2021-06-10 - 摘要：GlobeSAR mission is an international cooperation program,there are twelve countries participated in the program.GlobeSAR data are the first and sole airborne,dual-frequency and fully-polarized SAR data sets of covering the Chinese territory.This paper systematically presents the study results of GlobeSAR program in China.The radar backscatter intensity visualization model has been proposed to study the backscatter behaviors of various targets.Rice and euryale ferox received more attention than other targets,their backscatter behaviors in relation to frequency and polarization,and polarimetric features and responses are carefully studied.The geometric and radiometric correction,speckle noise filtering,image registration are applied to the multifrequency,multipolarization GlobeSAR data sets.The assessment of classification accuracy for maximum likelihood,neural net,and texture information added neural net classifiers shows that the texture information added neural net classifers achieved the highest accuracy.GlobeSAR images discriminated eleven land cover types,two forest types.Finally,the GlobeSAR data application results in agriculture,forest,geology,hydrology and tourism planning are introduced.
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发布时间：2021-06-10 - 摘要：This paper introduces briefly the measurement principle of radar altimeter,and discusses the relationship between time domain and frequency domain of full-deramp technology The splitting tracking software as well as full range searching software have been developed,and the sea return curve is obtained in the successful flight experiment The system performance is improved by data overlay named as smoothing-combination关键词：Radar altimeter;Full-deramp;Tracking;Data overlay
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发布时间：2021-06-10 - 摘要：This paper briefly introduces the principle of radar altimeter The performance analysis and key technique of ocean radar altimeter are proposed The analysis and discussion of experimental result of ocean radar altimeter have proven that its performance has completely satisfied the design requirement,and provides the technique precedence of ocean radar altimeter on satellite in the future关键词：Radar altimeter;Full deramp;Significant wave height;α-β tracker
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发布时间：2021-06-10 - 摘要：The authors have analyzed the quality of nonphotosynthetic background-soil spectra,found that the first derivative calculation of mixed spectrum could compress the signal of soil spectra in a large extent,Due to this reason the estimation of vegetation variables such as LAI,S Apar seems to well correspond to the real results It is very useful for us to apply imaging spectrometer to monitoring environment关键词：Vegetation variables;High resolution spectra;Imaging spectrometer
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发布时间：2021-06-10 - 摘要：In this paper,correlation between airborne hyperspectral data obtained with in the spectral range of approximately 417nm—800nm and three foliar biochemical constituents was studied.The hyperspectral data were acquired using Compact Airborne Spectrographic Imager（CASI） over six Study sites along an Oregon transect.Foliar biochemical constituents（expressed in concentration,mg/g of dry weight）:total chlorophyll（TC）,total nitrogen（TN）,total phosphorus（TP）,were measured from the same transect.The potential of CASI data for estimating foliar biochemical concentrations was evaluated,using multivariate statistical analysis and spectral derivative techniques.12 spectra corresponding to sample locations of foliar chemistry measurements were extracted from CASI images acquired within three weeks of the field sample collection.Univariate regression using 7 regression models was applied to explore both the linear and non-linear relations between individual channel spectral reflectances and vegetation indices derived from the CASI data and the three foliar chemical constituents.First and second order spectral derivatives were used to suppress the effects of low frequency spectra on those of the tree species.A piece-wise multiple regression procedure was used to generate multivariate linear equations for predicting TC,TN and TP using the original,and the derivative spectra of CASI data. Results show that with the spectral derivative technique,the estimation accuracies measured by Goodness-of-Fit（R 2）values and Root-Mean-Square Errors（SEs）of the three chemical constituents,can be greatly improved.The results obtained from the univariate analysis indicate that the level of correlation between foliar chemistry and CASI data is rather low.In fact,for TP no correlation exists between any individual band of CASI data and the measurements from laboratory.关键词：CASI image;Biochemistry;Spectral derivative technique;Regression analysis
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发布时间：2021-06-10 - 摘要：This paper discusses the seasonal characteristics of three characteristic wavelengths of λ pr ,λ pg ,λ og of Red-Edge reflectance for the Korean Pine leaves in gold mine area of Zhaoyuan City,Shandong Province The results indicate that the three characteristic wavelengths in gold mine area show annuall blue shifts in varying degrees against backgound area and the blue shifts are the biggest in fall for the first-year leaves and in spring for the second-year leaves,therefore,spring and autumn are the best season for detecting metal mineral under Korean Pine Forests using remote sensing method关键词：Gold mine area;Korean Pine;Seasonal characteristics;Blue shifts of red edge;Best season
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发布时间：2021-06-10 - 摘要：The snow disaster monitoring and assessment were carried out by means of snow disaster monitoring and assessment system（SDMAS）which could be updated by using NOAA/AVHRR data in the main pastoral areas of our country.Some models,such as snow disaster distinguishing,forcasting and assessment,which were developed based on the spatial attribute,data from the spatial analysis and operation of SDMAS,and their application are introduced in this paper Some results from the operation of SDMAS are approximately identical with the records of disaster reports
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发布时间：2021-06-10 - 摘要：A new concept of“Optical Vegetation Coverage”is put forward to estimating the amount of water contents of soil affected by vegetation using remote sensing technology Spectral information of Water contents are extracted using the method of decomposing pixels to remove the vegetation effects The method of spectrum of soil water contents is adopted A TM data model is built using a regression method On the basis of above methods,an AVHRR data model is set up关键词：Soil water contents;remote sensing;Optical vegetation coverage
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发布时间：2021-06-10 - 摘要：The station temperature measuments at 5 cm depth in Qinghai Plateau are compared with the records of horizontally polarized brightness temperature at 37 and 18 GHz from SMMR in 1983 The statistical analysis for classification freeze/thaw condition is used to determine a comprehensive algorithm of two parameters:brightness temperature at 37 GHz and spectral gradient of brightness temperature.It is partly considered that the influence of moisture content on classification,the accuracy of classification still reaches 74%.Since the Qinghai Plateau is located in an arid environment,the soil moisture content is low in Spring and the spectral gradient does not affect the increasing accuracy for classification关键词：Freeze/thaw of terrain soil;microwave remote sensing;Qinghai Plateau
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发布时间：2021-06-10 - 摘要：Based on the studies of mechanism of urban spatial growth,the paper analyese the spatial behavior of resident slection and land development,and under the support of GIS,spatial analysis and visual spatial representation,control and rejustment simulation system of urban spatial growth is built,and the system will support modelling and selection of optimal strategies of urban spatial growth Control关键词：Spatial growth;Potential spatio-temporal growth;Utility function;GIS;Control and rejustment;Spatial behavior
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发布时间：2021-06-10 - 摘要：How to produce and supply enough food,cotton,edible oil and meat and others is the most important problem for China In order to solve the problem,it is one of significant ways to enhance the capabilities of planning,management and decision making for governments at different levels Recently,the statistical data at county level are only one data source to cover the whole country annually So,a Chinese Agricultural Statistical Geographic Information System（CAS/GIS）has been developed in the division The system consists of 5 subsystems which are datapreparetion,query and retrieval,data analysis（histogram,detection of changes,sorting,classification,evaluation,prediction,etc ）,statistical mapping,demonstration and map output Supported by CAS/GIS,an“Atlas of Chinese Agricultural Statusat the County Level”was produced in 20 days after the raw data in hands The atlas includes 45 thematic maps and corresponding 45 tables It is very useful to agricultural planning,management and decision making at country and province levels In this paper,the system and its applications will be introduced in more detail
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发布时间：2021-06-10 -
Research of Integration of Remote Sensing,Geographical Information System and Global Position System
摘要：With the development of remote sensing,GIS and GPS,their integration become a hot point of geoinformatics. Because the integration of RS,GPS and GIS has involved in many academic areas and researchers,their conceptions and ideas about the integration are introduced with different academic background On the basis of the characteristics of geoinformation stream,the authors have analyzed the features of GIS,RS and GPS respectively and discussed the possibility and necessarity of their integration After two years’developing a real integration system the authors introduce the conception,model and problems to which more attentions should be paid- 146
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发布时间：2021-06-10
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