期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
激光雷达与遥感数据的山区地理信息处理技术 被引量:1
1
作者 白彬 《激光杂志》 北大核心 2017年第4期150-154,共5页
针对数学形态学分割方法进行多光谱遥感数据山区地理信息提取容易产生伪边缘和漏检的问题,提出激光雷达与遥感数据山区地理信息处理技术。首先采用激光雷达成像技术进行多光谱遥感影像采集,对采集的山区地理遥感影像进行图像边缘降噪和... 针对数学形态学分割方法进行多光谱遥感数据山区地理信息提取容易产生伪边缘和漏检的问题,提出激光雷达与遥感数据山区地理信息处理技术。首先采用激光雷达成像技术进行多光谱遥感影像采集,对采集的山区地理遥感影像进行图像边缘降噪和轮廓提取,以提取的边缘轮廓特征为中心矩进行仿射不变区域分割,得到遥感图像的仿射不变矩,结合多光谱遥感数据分析实现山区地理信息提取优化。最后通过仿真实验进行性能分析,结果表明,采用本文技术进行多光谱遥感成像和山区地理信息提取,输出图像的峰值信噪比较高,归一化相关系数较高,信息准确检测效能高于传统方法。 展开更多
关键词 激光雷达 多光谱遥感数据 山区地理信息 遥感影像 图像分割
下载PDF
Vulnerability of mountain glaciers in China to climate change 被引量:5
2
作者 YANG Jian-Ping DING Yong-Jian +1 位作者 LIU Shi-Yin TAN Chun-Ping 《Advances in Climate Change Research》 SCIE CSCD 2015年第3期171-180,共10页
Mountain glaciers in China are an important water source for both China and adjoining countries, and therefore their adaptation to glacier change is crucial in relation to maintaining populations. This study aims to i... Mountain glaciers in China are an important water source for both China and adjoining countries, and therefore their adaptation to glacier change is crucial in relation to maintaining populations. This study aims to improve our understanding of glacial vulnerability to climate change to establish adaptation strategies. A glacial numerical model is developed using spatial principle component analysis (SPCA) supported by remote sensing (RS) and geographical information system (GIS) technologies. The model contains nine factors--slope, aspect, hillshade, elevation a.s.l., air temperature, precipitation, glacial area change percentage, glacial type and glacial area, describing topography, climate, and glacier characteristics. The vulnerability of glaciers to climate change is evaluated during the period of 1961-2007 on a regional scale, and in the 2030s and 2050s based on projections of air temperature and precipitation changes under the IPCC RCP6.0 scenario and of glacier change in the 21st century. Glacial vulnerability is graded into five levels: potential, light, medial, heavy, and very heavy, using natural breaks classification (NBC). The spatial distribution of glacial vulnerability and its temporal changes in the 21st century for the RCP6.0 scenario are analyzed, and the factors influencing vulnerability are discussed. Results show that mountain glaciers in China are very vulnerable to climate change, and 41.2% of glacial areas fall into the levels of heavy and very heavy vulnerability in the period 1961-2007. This is mainly explained by topographical exposure and the high sensitivity of glaciers to climate change. Trends of glacial vulnerability are projected to decline in the 2030s and 2050s, but a declining trend is still high in some regions. In addition to topographical factors, variation in precipitation in the 2030s and 2050s is found to be crucial. 展开更多
关键词 Mountain glaciers Climate change VULNERABILITY PROJECTION
下载PDF
Quantitative prediction of mining subsidence and its impact on the environment 被引量:14
3
作者 Jianjun Song Chunjian Han +6 位作者 Ping Li Junwei Zhang Deyuan Liu Minde Jiang Lin Zheng Jingkai Zhang Jianying Song 《International Journal of Mining Science and Technology》 2012年第1期69-73,共5页
This study is focused on the prediction of mining subsidence and its impact on the environment in the Hongqi mining area. The study was carried out by means of a probability integral model based, in first instance bas... This study is focused on the prediction of mining subsidence and its impact on the environment in the Hongqi mining area. The study was carried out by means of a probability integral model based, in first instance based on field surveys and the analysis of data collected from this area. Isolines of mining sub- sidence were then drawn and the impact caused by mining subsidence on the environment was analyzed quantitatively by spatial analysis with Geographic Information System (GIS). The results indicate that the subsidence area of the first working-mine can be as large as 2.54 km2, the maximum subsidence is 3440 mrn which will cause 1524 houses to be relocated. The entire subsidence area of the mine can reach 8.09 km2, with a maximum subsidence of 3590 ram. Under these circumstances the value of the loss of ecosystem services Will reach 5.371 million Yuan and the cost of relocating buildings will increase to 6.858 million Yuan. 展开更多
关键词 Mining subsidence PREDICTION Ecological environment Quantitative analysis
下载PDF
Physical Land Suitability Assessment for the Large Cardamom Amomum subulatum Roxb.Cultivation in Hills of Kathmandu Valley
4
作者 Nabarath Baniya Michael Behme Saroja Baniya 《Chinese Journal of Population,Resources and Environment》 2009年第4期59-63,共5页
Nepal is one of the top three exporters of larger cardamom (Amomum subulatum Roxb.) in the world market contributing largely to the Nepalese economy. Sub-Himalayan range of hilly area of eastern Nepal is popular for... Nepal is one of the top three exporters of larger cardamom (Amomum subulatum Roxb.) in the world market contributing largely to the Nepalese economy. Sub-Himalayan range of hilly area of eastern Nepal is popular for large cardamom cultivation. Being similar phytogeographical and ecological setting, cultivation has begun in hills of Kathmandu Valley however land suitability needs to be evaluated with reference to specific need of the crop. Kathmandu is a valley with alluvial bottom and altitudinal range between 1200 and 2730m above sea level having cool to warm temperate climatic range. Varieties of aspects and slope gradient have potentiality for the large cardamom cultivation. Aim of the study was set to categorize available land area in the range of suitability for large cardamon cultivation on the basis of physical characteristics of the land and ecological need of crop. Land evaluation methodology has been designed along with site specific amendment in FAO framework (1976). Land use map in scale of 1:25 000 was used in geographic information system environment. Suitability was done through map overlaying methods. Aim of the study was set to categorize available land area in the range of suitability categories for large cardamom cultivation based on physical characteristics of the land matching with ecological need of crop. Analysis of data shows that altitudinal range at uplands of Kathmandu Valley and annual average rainfall and temperature are found to be within suitability range for Amomum subulaturn cultivation. Sandy loam soil, slightly acidic in nature with gentle sloping land of about 5-8° provides highly suitable condition. Result showed that more than one-third of total land area above 1800 m of altitude is suitable. Selectively, of the total area, 5% are north facing slope, 13% gentle slopes are highly suitable. 16% lands with north east orientation are moderately suitable. Most of the land areas which are marginaly suitabile for vegetable and cereal crops are highly suitable for large cardamom. Hills of northern boundary hills found to be suitable due to more rainfall distribution pattern compared to southern boundary hills. Therefore, land evaluation also identifies limitations and input requirements for sustainable production. 展开更多
关键词 land suitability GIS Amomum subulatum Roxb
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部