最新刊期
卷 ， 期 1 ， 1989
- 摘要：In this paper, with a real example, we examined the images of Band C of the imported Airborne Synthetic Aperture Side-Looking Radar and the errors in scales, points, lines and areas in different regions in case of different geomorphological conditions. Additionally, based on the features of the radar images, land and forest type classification systems and markings for interpretation are set up. Experimental work is conducted on interpretation of land and forest types as well as forest regionalizations. The results show, as for as the images concerned, they possess considerable geometric accuracy and provide better information on boundary and compartmental lines and the ability of distinguish for land and forest types. Therefore, they are considered to have practical value in forest resources inventory and dynamic monitoring.
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发布时间：2021-06-10 - 摘要：In order to measure the area of surface warer bodies in Hubei Province, a highly accurate and efficient technique for computer aided recognition of water information using Landsat MSS images was developed. The technique was designed based on the study of spectral signatures of water and non-water information, the data character of ratio images and the enhancement of atmospheric correction.According to the study of spectral signatures, the main information which differentiates water bodies from non-water objects concentrates on band MSS4 and band MSS7. The ratio image of two bands can both merge the information contained -in each band into one image and supperss shadow which is harmul to waiter recognition. Analysis of data character of latio images indicates that the information loss of a ratio image concentrates on the low value section of its value range, when the image is scaled and changed from real type to integer type. Whereas the information in high value section is relatively enhanced by the processing. As the pixels of water bodies possess high values in a MSS4/MSS7 images and low values in MSS7/MSS4 image, the MSS4/MSS7 is superior in water recognition to MSS7/MSS4. But even MSS4/MSS7 images can not completely eliminate dark shadow, the major obstacle to raise the accuracy of water recognition is in mountain areas. This problem is solved by introducing the atmospheric correction to MSS4 before MSS4/MSS7 ratio processing. In a MSS4/MSS7 image with atmospheric correction, the pixel values of water bodies are larger than 1, while the pixel values of dark shadow and other non-water information are less than or equal to 1. Therefore, the water recognition image with high accuracy can be obtained simply by thresholding.The technique is very simple and more precies than common used classification techniques. Its processing speed is more than three times faster than that of mini -distance classification. Besides, the technique can be used not only to MSS images but also to TM images. The successful water area recognition and measurement of whole Hubei Province has shown that the technique can produce perfect results in various areas of different geomorphic types.
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发布时间：2021-06-10 - 摘要：Integration and digital image analysis of remotely sensed, geological, geophysical and geochemical data are gaining wide recognition as effective tools for mineral exploration.This study involves methods for integration of image processing of two-temporal LANDSAT-MSS images, geological, geophysical and geochemical data, and for a computer based mineral prospecting. In this paper, a general scheme of computer aided integrative processing of multi-source data and a digitalizing method for the qualitative geoscience data were described; a computer based mineral prospecting method, TQ2 classifier, using integrated qualitative data was designed. These methods were applied to Wubu Lead-Zinc deposit area in the south of Zhejiang Province.It is necessary and important for the integration of digitize geoscience data and of co-registered multi-source data. The analysis and interpretation of integrated data can provide much information about geological structure. The TQ2 mineral prospecting method using integrated qualitative data is effective, and the result of mineral prospecting by computer is reliable.
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发布时间：2021-06-10 - 摘要：This paper describes experiments of the use of topographic sketch method in the region of Sanchuan river basin, Shanxi province, this basin is a region of loess hilly ravine land. Better results can be obtained when following choices are employed: using the discrete cosine transformation facet; smaller window size; DEM from better resolution data.The experiment shows that the topographic sketch method is practicable for extraction of ravine network or basin network from DEM and able to use it for geographic information system.
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发布时间：2021-06-10 - 摘要：This paper will brief you on establishment of one kind of GIS system-PURSIS （Peking University Remote Sensing Information System） on microcomputer, IBM PC/XT, AT, and simply explain its basic characters, functions for data processing, digital data formats, picture data base system and expert system. Based on the idea of modular programming, we should organically combine many thematic GIS, each of them becoming a subsystem. The data collected and stored by GIS can be shared b’y any subsystem. The main system is composed of some share processing modules, which is the share software resource by the users. In this paper, we also introduce some techniques for the organization of the system, basic conception of the expert system, data encoding, color display for the picture on the IBM PC, etc.
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发布时间：2021-06-10 - 摘要：In theoretical, this article discusses the feasibility of integrating the geographic data supplied by geographic information system and remotely sensed data. In methodically, it discusses how the ≥10℃ accumulated temperature, terrain elevation and annual rainfall, which were considered as three key factors to reflect the local climatic resource conditions, can be digitized according to a certain ground grid system, then integrated it with the LANDSAT TM data. In application, it takes the natural environment of Changbai County, which located in southern slope of Changbai Mountains, as working area and makes mountainous climatic resource study. The research results show that the research method changes the single spectrum information structure of LANDSAT remotely sensed data set; it realized the digital transmission and image display of geographic data; enriched the image information. In the climatic study, the quantitative boundary of different classes were realized and the accuracy of classifications were greatly improved.关键词：地理数据量化;TM数据主成分分析;信息复合;气候区划
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发布时间：2021-06-10 - 摘要：This paper described the manufacture process of color optical mosaic on a general B/w rectifier and gave an detailed research on aspects of manufacture, color correction and photograph process. / At last, the paper gave also a mathematical accuracy analysis of the finished photograph.,The accomplishment has a value of popularization for its simple methods and common instrument.关键词：彩色影像;纠正仪;纠正;光学镶嵌;像片制图
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发布时间：2021-06-10 - 摘要：This paper briefly introduces the concept of bidirectional reflectance and its relation to 3-D spatial structure of ground objects. It is suggested to develop appropriate BRDF models for various kinds of earth surface along with the process to set up a high spectral resolution data base for their signatures. Otherwise, it is pointed out, the costly data base can hardly deal with the great diversity of natural scene in composition and structure.
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发布时间：2021-06-10 - 摘要：The purpose of this study is to present a method of estimating rice yield from remotely sensed data, which offers a biological based. The principle and technique of the method were described in the former paper （No. 4, Vol. 3, 1988. "Remote sensing of Environment CHINA"）. The technique of estimating rice yield with Landsat images is presented here. Firstly, the vajues of leaf area index （LAI） at ten sites in each experimental field are estimated with the data of MSS spectral reflectance using the Suits method, and the mean value of leaf area index （LAI） of each field （about 20-40 ha.） is obtained. Secondly, a relationship between PV1 obtained from Landsat images and LAI is derived. The leaf area index （LAI） of each field in whole study region is estimated using this relation. Thirdly, the rice yield can be estimated from the LAI of each field using the method presented in the former paper. At the end, some aspects of effecting the accuracy of the estimated yield from this method are discussed.
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发布时间：2021-06-10
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