共查询到20条相似文献，搜索用时 406 毫秒
1.
2.
主要从大比例尺航测成图质量评定角度出发,提出了既要满足相应规范和用户要求,又要最大限度的发挥航测成图的优势,对产品质量做出公正、客观、正确的质量评价方法。 相似文献
4.
5.
生产数字正射影像图(DOM)的若干技术问题探讨 总被引：3，自引：0，他引：3
方剑强 《测绘与空间地理信息》2007,30(3):91-93
讨论了常用的几种制作数字正射影像图(DOM)国产软件的特点,结合生产分析,指出了制作数字正射影像图的技术核心,也指出了生产中的一些不足之处,以期对解决DOM生产过程中出现的常见“毛病”做出改进。 相似文献
6.
7.
SAR干涉图作为相位信息的载体,其质量直接影响对研究区域形变状况的进一步分析,采取有效的滤波算法能抑制干涉图相位噪声,提高干涉测量精度。在获得的干涉相位图中,由于矿区开采而造成的地表沉降会体现出近环状相位条纹的特征。针对这一特点,对传统的基于梯度的滤波算法做出了改进,并结合Goldstein频域滤波和改进的梯度自适应滤波,提出了一种适用于矿区沉降形成的SAR干涉相位模式滤波方法。选取河北峰峰煤矿的PALSAR干涉相位图作为实验数据,对该滤波方法做出了详细的性能评价和对比。结果表明,采用本文提出的综合滤波方法在显著降低实验区SAR干涉图相位噪声的同时,也很好地保持了相位分辨率,使由于矿区沉降而造成的形变相位环的边缘形态更加清晰。 相似文献
8.
9.
10.
11.
以滇东南岩溶区独特的地理环境作为研究对象,根据《生态功能区划暂行规定》和国内外已有的土壤侵蚀敏感性的研究成果,选择地形起伏度(LS)、植被覆盖度(C)、土壤质地(K)3个自然因子作为滇东南岩溶区土壤侵蚀敏感性评价的指标,在GIS时空分析功能支持下,以《生态功能区划暂行规定》的敏感性等级标准为依据,分析各个因子对土壤侵蚀敏感性的影响,并结合研究区域实地情况对各个因子分别进行土壤侵蚀敏感性的评价。在各因子单独分析的基础上运用GIS的空间分析功能,根据这些敏感因子对侵蚀敏感性影响程度的不同分配、不同权重,进行综合分析评价,得到不同敏感程度区域的面积和空间分异特征。 相似文献
12.
中国西部地区生态环境现状遥感调查 总被引：4，自引：0，他引：4
针对“中国西部地区生态环境现状遥感调查”的需要,综合运用景观生态学理论、生态系统服务功能理论、可持续发展理论、遥感和地理信息系统技术,研究中国西部地区生态环境现状遥感数据的处理与集成,开展中国西部地区土地覆被和生态要素结构变化分析、沙漠化和水土流失强度评价、生态脆弱特征及时空分布规律分析、基于遥感调查的生态环境质量评价、基于多时相遥感数据对比的典型区生态环境遥感分析和生态环境变化成因对策分析等综合性的研究,并以量化和可视化的形式系统地反映西部地区生态环境现状及其变化的空间分布、空间统计和空间特征规律。 相似文献
13.
Integrated approach of using remote sensing and GIS to study watershed prioritization and productivity 总被引：1，自引：0，他引：1
Soil data obtained from soil resource inventory, land and climate were derived from the remote sensing satellite data (Landsat
TM, bands 1 to 7) and were integrated in GIS environment to obtain the soil erosion loss using USLE model for the watershed
area. The priorities of different sub-watershed areas for soil conservation measures were identified. Land productivity index
was also used as a measure for land evaluation. Different soil and land attribute maps were generated in GIS, and R,K,LS,C
and P factor maps were derived. By integrating these soil erosion map was generated. The mapping units, found not suitable
for agriculture production, were delineated and mapped as non-arable land. The area suitable for agricultural production was
carved out for imparting the productivity analysis; the land suitable for raising agricultural crops was delineated into different
mapping units as productivity ratings good, fair, moderate and poor. The analysis performed using remote sensing and GIS helped
to generate the attribute maps with more accuracy and the ability of integrating these in GIS environment provided the ease
to get the required kind of analysis. Conventional methods of land evaluation procedures in terms of either soil erosion or
productivity are found not comparable with the out put generated by using remote sensing and GIS as the limitations in generating
the attribute maps and their integration. The results obtained in this case study show the use of different kinds of data
derived from different sources in land evaluation appraisals. 相似文献
14.
遥感与GIS支持下的土壤侵蚀强度快速评价方法研究 总被引：2，自引：0，他引：2
以TM影像、1︰1万数字地形图以及其它辅助数据为基础，以土地利用类型、植被覆盖度以及坡度等作为影响因子，在遥感
和GIS技术的支持下，对余江县洪湖乡的土壤侵蚀强度进行了快速分级评价实验。结果表明，该方法所获取的土壤侵蚀强度信息与
实际情况比较吻合。 相似文献
15.
The accurate assessment of soil erosion in the spatial environment can give valuable input in designing reservoirs and for preparing watershed management action plans. Rangit River in northeastern India is affected by severe soil erosion, causing reduction in its reservoir capacity. The main aim of the paper is to estimate the soil erosion in the Rangit catchment, India through a process-based soil erosion model that integrates remote sensing and field data in the geospatial domain, and also to identify the problem areas for further watershed management action plans. Various topographic parameters that were derived from land use, soil texture and a digital elevation model were used for the estimation of soil erosion. The Morgan, Morgan and Finny model was used to compute soil erosion. Based on the drainage pattern, the catchment was divided into eight sub-catchments for detailed study. Annual soil erosion was estimated for four years from 2002 to 2005 using the corresponding year’s meteorological data. Estimated soil erosion was compared with the field data in each year and found very good correlation. 相似文献
16.
Temporal and spatial relationships between soil erosion and ecological restoration in semi-arid regions: a case study in northern Shaanxi,China 总被引：1，自引：0，他引：1
Xin Wen 《地理信息系统科学与遥感》2020,57(4):572-590
ABSTRACTTo assess the effects of the Grain for Green Program (GGP) on soil erosion is essential to support better land management policies in the Chinese Loess Plateau. Studies on the evaluation of the effects of the GGP on soil erosion have garnered heightened attention. However, few studies examined the efficiency of GGP on soil erosion control through spatial relationship analysis. Thus, this study focuses on analyzing the spatial variation relationship between soil erosion and GGP in northern Shaanxi, Chinese Loess Plateau, from 1988 to 2015. The Universal Soil Loss Equation was used to quantify changes in soil erosion at the regional and watershed scales, and the Geographically Weighted Regression model was used to analyze the spatial relationships between land use and land cover (LULC) and soil erosion. Our results indicated that the major characteristic of LULC change during the GGP was a rapid increase of vegetation area and a rapid decrease of cropland. Bare lands contributed to the most serious soil loss, followed by croplands and sparse grasslands. The GGP had a globally positive influence on the decrease in soil erosion over the study area, but the amount of soil erosion in western and northern regions maintained a severe level. Spatial heterogeneity in the nature of the relationships among different vegetation, croplands, and soil erosion was also observed. The change rate of wood and the change rate of soil erosion in northern sub-watershed represented a negative relationship, while the change rate of sparse grassland was negatively correlated to the change rate of soil erosion in 21 sub-watersheds, account for 72% of the study area. The GGP implemented in northern sub-watersheds were more effective for soil erosion control than southern sub-watersheds. We propose that current areas of vegetation can support soil erosion control in the whole northern Shaanxi, but local-scale ecological restoration can be considered in northern sub-watersheds. 相似文献
17.
18.
C. J. Thampi 《Journal of the Indian Society of Remote Sensing》1983,11(1):23-29
The paper discusses the use of Remote Sensing techniques for the integrated economic land use planning in Andaman and Nicobar Islands, agricultural land use being the main objective. Broad aspects of physiography, soil, land use etc. have been described. An idea about the soil environment and erosion hazards is given. A land use pattern on the basis of land capability and land suitability classification together with cropping pattern has been evolved and the model has been developed for the Island. 相似文献
19.
遥感和GIS支持下的中国退耕还林还草决策分析 总被引：29，自引：1，他引：29
1998年的特大洪水灾害，以及2000年京津地区的沙尘暴，使得中国政府对生态环境的建设更加重视。为了改善中国的生态环境，就需要恢复植被，一些耕地就需要退耕还林还草。哪些耕地需要退耕还林还草，这些耕地在空间上的分布情况如何？为此，探讨了利用地理信息系统技术确定需要退耕还林还草耕地的数量及其空间分布。包括4个步骤。首先，建立土地利用、土壤侵蚀、数字高程、坡度、坡向、植被指数、降雨和温度等数据库，并对生态环境质量进行评价，从而得到生态环境质量数据库；其次，从土地利用数据库中提取旱地的数据，并与坡度数据、土壤侵蚀数据、植被指数数据和生态环境质量数据进行叠加分析；再次，确定退耕还林还草的原则，并在GIS的支持下，确定需要退耕还林还草的面积及其空间分布；最后，利用降雨数据进一步分别确定退耕还林或还草的面积及其空间分布。该研究结果可以为中国的生态环境建设提供科学的决策依据。 相似文献