最新刊期
卷 ， 期 2 ， 1987
- 摘要：This paper was written on base of the genera] remote sensing reexamination of resources in Sanjiang Plain which is about 18,900 km2. In this article we discussed the achievements of current situation map of interpretation, image map, data of resourse reexamination and comprehensive evaluation in the following six aspects: the selection and application of remote sensing data, the making of geographic basis map, the principles and systems of classification, the steps of interpretation and the technological process of mapping, the analyses of the quality of satellite image, the precision of map and the current situation of land use. The methods and achievements discussed in this article are high precise, fast, high economic efficient and are valuable to extend.
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发布时间：2021-06-10 - 摘要：This research was made by a combined use of MSS, treatment with digital magnetic tape, and ground data collected for different specialized perposes. Several data preprocessing methods were suggested to improve the data quality. Preprocessing of data includes:（1） FFT2D and Gauss’ Filter on MSS4;（2） FFT2D and IFT2D based on MSS5;（3） Scale on MSS7:（4） Color-composite of the results of 1, 2, ; Provides a clear image for vegetation and geo-morphology; （5） Piecewise linear and palette on MSS4.The results of 5 is used in information extraction of vegetation types and their delimitation with the data collected on the ground. Information about geomorphology, vegetation, soil, climate can be obtained and a corresponding series of maps can be made.The color infrared photographs can be further used for the detailed investigation of land assessment of environmental quality to build the information base for land resourses environmental quality and social economy. By using mathematical models, the evaluation of land quality and management program could be done.
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发布时间：2021-06-10 - 摘要：Baiyangdian lake is one of Largest lakes in the North China plain. Recently, its water area has gradually decreased year by year. Since 1984, this lake has almost dried up. The change of water body makes a notable impact on eco-environment and economy development in this region.In order to study on water body change, a geographically referenced data base of land cover of this area was compiled from topographic map at a scale of 1:50,000. The grid cell size is 250×250 metre. The airphotos and Landsat images for MSS and TM were acquired in same season, but different years （1961-1984）, and were optically transformed to the grids map using ZOOM Transformer. Meanwhile, the interpretation of each remote sensing image was conducted cell by cell based on seven coded categories of land cover. All data were entered into PDP 11/23 computer system. The graphics by compute processing were used to present the distribution and change of land cover. The result shows that the cultivated land has increased by 40,000 hectare, conversely the water area has want down 43333.3 hectare in this area from 1961 to 1984.Through correlative matric analysis which consisted of factors affecting the chang of water area in Baiyangdian lake, it can prove that the expanding of cultivated land and residential area have negative correlation with water area, the amount of entering water and the rainfall positively correlated with water area. Among which the correlation coeficient （R） between the amount of entering water and water area is 0.97. This demonstrates that the increase of water consumption of city industry and expanding of irregation area are important factor on the cutting-off for water supply and the drying up for water body of lake in dry season.
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发布时间：2021-06-10 - 摘要：Zhang Youjing（East Chiua Technical University of Water Resources）Fang Youching（Nanjing University of Forestry）
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发布时间：2021-06-10 - 摘要：To monitor the dispersion and dilution performance of a sewage outfall a dye can be injected into the sewage and the resultant plume tracked by boat. In recent years remotely sensed imagery has proved to be a useful adjunct to boat survey as it provides a synoptic view of a plume at an instant which, as a result of tide, wind and current changes, a boat survey is unable to do.The aim of this survey was to use airborne multispectral scanner （MSS） imagery and a methodology of modeling, inversion and accuracy assessment to estimate and map the concentration of three dyed plumes of sewage. After the radiometric, atmospheric and irradiance correction of the airborne MSS data, a standardised radiance index was highly correlated with dye concentration （r = 0.85, significant at the 99% confidence level）. Following inversion and extrapolation of this relationship to all of the airborne MSS data, twenty two plume plots were produced. For a seven-class classification of dye concentration these plume plots had an accuracy of 49-90% at the 95% confidence level increasing to 68-100% at the 95% confidence level for a two-class classification.
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发布时间：2021-06-10 - 摘要：In this article, the techniques of fully utilization of system hardware and software resources for increasing computing speed of image geometric correction for mini-computer based digital image processing system are introduced. These techniques are: the refresh memory planes of the image display device are used as the buffer storage of the image data for reducing the number of data transfer between the disk drive and internal memory; two sets of polynomial coefficients are adopted for discarding the redundant computation of non-available image space; and the multiprocess multi-program techniques are used in software implementation. The computing speed of geometric correction of large image data such as the Landsat MSS image data is increased significantly. These techniques have been implemented in the IRSA-2 digital image processing System and can be used in all mini- or micro-computer based digital image processing systems.
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发布时间：2021-06-10 - 摘要：This paper deals with the application of close-range photogrammetry in aspect of surveying plane figure of large scale wood constructive ancient tower, including outdoor control surveying, photographic works, and orientational and surveying works indoor by the way of simulate surveying. In the meanwhile, we make an accuracy analysis as well. In additional, the paper approaches the no parallel problem between the projection plane and rows of tiles on a roof in the procedure of surveying. In the end, summary the advantages of surveying and drawing ancient towers by using the method of close-range photogrammetry.
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发布时间：2021-06-10 - 摘要：This test is concentrated on feasibility of an approach to investigate Seabuckthorn （Hippo-phea Rhamnoides L.） by using false color aerial photo. It shows that this approach has many advantages such as high accuracy, increased speed, economical operation and etc. and can be spreaded to other fields related to investigating natural resources.
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发布时间：2021-06-10
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