最新刊期
卷 ， 期 1 ， 1998
- 摘要：国家遥感应用工程技术研究中心ＮａｔｉｏｎａｌＥｎｇｉｎｅｅｒｉｎｇＲｅｓｅａｒｃｈＣｅｎｔｅｒｆｏｒＧｅｏｍａｔｉｃｓ（ＮＣＧ）国家遥感应用工程技术研究中心于１９９６年１２月２５日由国家科委正式批准组建（国科发计字［１９９６］６０３号文件）。中国科学...
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发布时间：2021-06-10 - 摘要：Quantiative remote sensing requires atmospheric correction, which requires directional reflectance or emittancc of the earth surface as the boundary condition of the radiative transfer problem. But the actual reflectance or eminence characteristics of the earth surface are what the quantitative remote sensing aims at. This presents as a deadlock. In order to solve the problem, Hu et al. suggested a BRDF-based correction loop. However the convergence of such an iteration loop is to be studied. Hu et al. used simulations to show the loop converging. But it’s not easy to exhaust all the possible cases by simulations. This paper is to analyse theoretically the loop’s convergence and its conditions.
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发布时间：2021-06-10 - 摘要：The paper presents the results of study on mineral resources and geological structure in Tarim region, imcluding Tarim basin and its surrounding areas （up to 1 million km2）, by using ’35’ techniques and supplemental research methods such as geology, geophysics and geochemistry. The results show the special kind of tectonic framework constructed by the internal, middle and outside circular zones. Based on the fact above and mineral interpretation, the new structure types, so-called "arc-looped structure" and "arc-looped geological environmental belted system " which control the regional mineral distribution . Are put forward. A comprehensive prospecting model, which is called the integrated analysis on multiple key factors of geology, has beed established. The five circular belts of mineralization zones which favorable are to oil and gas, potash salt, uranium and coal, metal, nonferrous such as construction materials, gem and jade, are distinguished, and the super-large scale potash salt prospects in Luobubo region and four rich-water areas in the Taklamakan Desert are discovered. In addition, the new points of characteristics of Tarim block movement and structural system are proposed as "stable area in unstable background and unstable area in stable background".关键词：Remote sensing;Arc-looped structure;Prospecting model;Mineralization;Geological environment .
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发布时间：2021-06-10 - 摘要：According to the general configuration of a scanning optical system for airborne 3-D information acquisition, the relation between the scanning trace of the sampled sites on the earth and the configuration parameters of the optical system is established and, the quantitative expression of the coordinates of the sampled sites on the earth is obtained. For some specific scanning traces, the selected methods and designed results of the configuration parameters of an optical system for terrain measurements are given.关键词：Airborne earth positioning;3-D information acquisition;Airborne scanning range;Scanning trace.
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发布时间：2021-06-10 - 摘要：In large area crops yield estimation from remote sensing data, crops planting area estimation with NOAA data remains to be resolved difficultly. Those mixed pixed decomposition methods given before are impractiable, or not suitable for AVHRR data. In view of points above, a new method, more scientific and economic than before, is put forward, that is to estimate crops planting area by means of AVHRR mixed pixel neural network decomposition model, which comprehensively makes use of the advantages of both TM data and NOAA data .关键词：AVHRR mixed pixel;neural network
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发布时间：2021-06-10 - 摘要：The land surface temperature （LST） is one of the most important parameters required to monitor many environmental phenomena such as the Land-Atmosphere Interaction. It is difficult to retrieve LST, because: 1) the emissivity of the land surface is unknown and is not equal to 1 which make atmospheric correction more challenging than before; 2) the land surfaces are usually inhomogenous and changeable LSTs may exit within a pixel, which make the definition of effective surface temperatures and emissivities difficult; 3) the air temperature near the land surface are usually quite different from the actual LST, which may weaken the linear assumpdons in the atmosphedc correction; 4) the skin effect of the LST is more obvious than SST. At first, we assume that the emissivity of the land surface is known. Based on the atmospheric radiative transfer equation, a non-linear atmospheric correction model had been worked out in order to retrieve LST from NOAA/AVHRR aided by the lowtran-7 Program. We have simulated different atmospheric conditions and different land surface condition. Accurate radiative transfer simulations show that: 1)the accuracy of the LST is about 0.48K if the error of the atmospheric profile is less than 2K and the error of the water vapor profile is less than 20%; 2) the accuracy of the LST is about 0.85K for one atmospheric model error; 3) non-linear atmospheric correction model has better accuracy of LST. Then. we assume that the neighbored pixel has the same atmospheric condition and the difference of the emissivity of two NOAA/AVHRR channels is constant for every type of surface. A model to retrieve not only the LST but also the emissivity from two channels is and two neighbored pixels of two temporal images. We simulate different atmospheric conditions and different land surface condition by Lowtran-7. Results show that: 1) the accuracy of the LST is about 1.5K the accuracy of the emissivity is about 0.02 and the accuracy of the ground radiance about 1% can be obtained. if the error of the atmospheric profile is less than 2K and the error of the vapor profile is less than 20%; 2)we may reach the accuracy of LST about 1.0K and the accuracy of the ground radiance about 0.6%, if the error of the atmospheric profile is less than 2K and the error of the water vapor profile is less than 10%.关键词：Land surface temperature;Emissivity;Atmospheric correction;Non-linearity model
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发布时间：2021-06-10 - 摘要：Synthetic aperture radar （SAR） is an important tool in microwave remote sensing. Among SAR techniques, SAR processing, which processes the received signal into SAR images, is the key point In fact. synthetic aperture is realized by SAR processing. Different algorithms for SAR processing are described and a matched filtering with Chirp Scaling algorithm is presented. It removes the interpolation step for range cell migration correction （RCMC） and accomplishes better phase preserving and focusing. The images processed are superior to those obtained by other SAR algorithms.关键词：Matched filtering;Chirp scaling algorithm;Range / Doppler algorithm;Range cell migration correction
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发布时间：2021-06-10 - 摘要：Generalization of Remote Sensing Image, which is called image post-processing in some references, is an essential step to output thematic map of CAM by using RS image. Template and filtering is often applied to remove little polygons and smooth boundary. But it can not consider the properties of the polygons and their different importance of each type, therefore it could not meet the needs of the generalization . Based on the artificial intelligence, this article imitates mapping worker’s process of generalization of RS image. By using the knowledge expressing method of frame, an experimental knowledge base was built and a reasoning machine was designed. In addition, a satisfactory effect was obtained form the experiment based on the TM classified map of the People’s Republic of Mongolia.关键词：remote sensing image;Polygon;Cartographic generalization;artificial intelligence
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发布时间：2021-06-10 - 摘要：Polarized brightness temperature（TB）data of the DMSP SSM/I over crop areas of the northern China in 1996 is studied. Some TB indexes, such as scattering, polarization and crop monitoring indexes, are defined and applied to the analysis of temporal variation of thermal emission from crop areas. This paper provides a novel approach to analyze the functional dependence of polarized microwave TB data on atmospheric and surface conditions during crop growth. It also presents a numerical simulation of vector radiative transfer equations with multiple scattering for a vegetation/snow model at SSM/I channels.关键词：Spaceborne remote sensing;SSM/I;Crop area
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发布时间：2021-06-10 - 摘要：Remote sensing image fusion of different data sources of the same area can be used to enrich the information about the interested areas. The image fusion of the most different bands of electro-magnetic spectrum （such as optical and radar data）, provides additional information with respect to each of single sensor separately, thus more accurate classification can be achieved. Fused high spatial resolution data （such as panchromatic air photo） and lower spatial, but higher spectral resolution data （such as LANDSAT TM）, can improve image sharpness and enhance feature extraction and visual interpretation, and can be used for objects’ detection change. At present image fusion has three basic methods to be discussed on remote sensing section: 1. pixel-based fusion, 2.feature-based fusion, 3.decision-level fusion. In this paper three methods of multisource image fusion are discussed. They are pixels-based weight fusion, feature fusion based on wavelet transform and separate classes fusion based on Bayes rule.关键词：Multi-source image;Weight fusion;Feature fusion;Separate classes fusion
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发布时间：2021-06-10 - 摘要：This research was for in-flight SPOT calibration conducted in July, 1995. SPOT HRV was calibrated by La Crau test site and on-boarding calibration methods. 65 CODE was used for test site calibration and reflectance retrieval of some ground targets. The calibration coefficient A & A’was calculated. The calibration results based on both methods were compared and analysed. The analysis results have shown that: （ 1 ） calibration precision based on test site is higher than that obtained from on-boarding calihration; （2） 65 CODE is practical and fast for calibration and reflectance retrieval; （3） there are system errors in both methods; （4） the uncertainty of calibration coefficients can be estimated by the retrieved reflectance, of some targets; （5） the reliability of calibration result is proved by the consistence in calibration precision range for both or more independent methods: （6） the calibration result difference for different calibration methods can be used to diagnose the sensor state and to correct inadequate method or some mistakes, and also to guide the applications.关键词：remote sensing;calibration;Retrieval;reflectance;Uncertainty
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发布时间：2021-06-10 - 摘要：《风云二号》静止气象卫星１９９７年６月１０日２０点０１分，从我国西昌卫星发射中心，由长征三号运载火箭成功地将我国自己研制的《风云二号》静止气象卫星发射入轨（封面）。６月１７日，《风云二号》卫星成功地定点在东经１０５°赤道上空。６月２１日１４时０１分，...
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发布时间：2021-06-10 - 摘要：The rock heat-transfer model which involves the rock infrared spectral behavior and thermal properties （thermal inertia） has been derived based on the analysis of several rock thermal models. Much lab or field data were used to compute the disrnal temperature variation on the rock surface. From the diurnal temperature variation curves of rocks with different thermal inertia, it can be shown that the diurnal temperature variation of the rock with high thermal inertia value is much larger than that of the rock with low thermal inertia value. When the albedo, emmissivity and vertical heat flux of the rock were changed respectively, only the magnitude of the rock diurnal temperature changed and the whole trend of temperature variation did not change greatly. This was very different from the case that the rock thermal inertia changed.关键词：Thermal model;Rock;Heat transfer;Thermal inertia
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发布时间：2021-06-10 - 摘要：This work describes decomposition and synthesis techniques applied to remote sensing image analysis and focuses on the need for analyzing a series of segments in accordance with the variance of scenes. The algorithms described here take two unique approaches. The blocking image method is used for constructing a series of segments. The length function of area is defined that determines the strength of the similarity between a pair of lines. Some tests are also described, and the results indicate that the methods work well for a variety of images.关键词：Sequence image segmentation;The method of blocking image;The length function of area
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发布时间：2021-06-10 - 摘要：Traditional remote sensing uses stereopair or space transformation theory to position for ground based on ground control points which are surveyed in field or in map, but 3D remote sensing system applies GPS receiver, attitude measure unit and scanning laser rang finder to directly position for the remote sensing pixel which is captured simultaneously. Thus, it can obtain 3D position and remote sensing information of each ground point at the same time （almost in real-time）, from airborne test we can find 3D remote sensing directly positioning for ground is a breakthrough in remote sensing because it is fast. real-time and without ground control points.关键词：3D positioning;GPS;Attitude;Laser range finder;Error
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发布时间：2021-06-10 - 摘要：The ocean color satellite is mainly used to observe the water content, such as chlorophyll, suspended material and yellow substance. The total radiance arrived et the sensor in the space is divided by the solar radiation as normalized albedo and coded to send back to the ground station. The ocean color are generally detemined by water content. They are monitored by measuring the water leaving radiation from ocean surface, which is a very small part of the total radiation received by the sensor. The most radiance is from atmospheric path and sun reflection of water surface. The radiation ratio of signal to noise from atmosphere etc. e. g. the ratio of the water leaving radiance to noise radiance, is characterized by the possibility of extracting the water color signals. It the paper, the signal characteristic scale （SCS） -normalized albedo and the radiation ratio of signal to noise have been firstly discussed, based on the mechanisms of the satellite ocean color remote sensing. For the radiation transfer of the ocean-atmosphere system, the transport of solar radiation is separated into various processes, such as the molecular and the aerosol scattering. Sun reflection of water surface and water leaving radiance can be computed by the radiation models, which are depended on the satellite orbit parameters （satellite altitude, inclination angle, crossing equator time and satellite fight direction）, sensor properties （FOV, scanning rate, band wavelength）, air condition （pressure, visual visibility, wind speed etc.） and water condition such as the concentration of the chlorophyll, suspended matter and yellow substance. Secondly, in the paper, it is focused on calculating the SCS of Chinese Ocean Color and Temperature Scanner （COCTS） which is being planned to be installed in the first Chinese ocean color satellite proposed to launch during the period of Chinese Ninth ’Five Plan’ Finally, the SCS response on the time and space has been studied in detail, with the calculation of SCS in various cases, such as different seasons which are substituted by the typical date Vernal Equinox, Summer Solstice, Autumn Equinox and Winter Solstice, and different satellite passing local times from 8:00 to 15:00 as well as the different pixels in one scan line. The results of the study show that the SCS is a philosophic concept provided to predict the quality and to evaluate the availability of the imagery from the Chinese COCTS.关键词：Ocean color remote sensing;Signal characteristic scale;Normalized albedo;Radiation ratioof signal to noise
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