排序方式： 共有86条查询结果，搜索用时 15 毫秒
41.
海岛 ,特别是一些面积小的岛屿 ,处于复杂的环境中 ,具有陆地与海洋的多种尺度特征。 IKONOS卫星遥感图像是现有遥感信息中空间分辨率最高的卫星数据之一 ,因此是海岛详细探测、大比例尺遥感分析的重要信息源。南麂列岛作为国家级海洋自然保护区 ,素有“贝藻王国”之称 ,具有典型性和示范性。本文是利用 IKONOS卫星遥感图像研究南麂列岛岸线特征、人工构筑物与近海目标以及土地覆盖的初步成果。结果表明它对细小目标的探测具有很大的潜力。 相似文献
42.
利用IKONOS卫星图像阴影提取城市建筑物高度信息 总被引：18，自引：3，他引：18
在分析IKONOS卫星图像上建筑物阴影与实际高度关系的基础上,阐述了估算城市建筑物高度的原理和方法,并在以北京市中关村、天坛公园和北海公园为例的试验中,较为准确地得到了建筑物高度信息,从而显示出卫星遥感在城市园林规划与环境数值模拟等方面应用的巨大潜力。 相似文献
43.
IKONOS遥感数据在离子吸附型稀土矿区环境污染调查中的应用研究——以赣南寻乌地区为例 总被引：2，自引：0，他引：2
稀土矿山的开采活动产生了一系列的环境问题。为解决我国南方离子吸附型稀土矿山环境监测的问题,本文选取赣南寻乌地区为研究区,针对目前离子吸附型稀土矿存在的两大环境问题——土地荒漠化及水体污染,采用IKONOS高分辨率遥感数据进行监测方法研究,运用光谱角分类算法提取了研究区土地荒漠化较为严重的区域,运用ISODATA非监督分类算法对稀土矿开采周边河流污染程度进行评估。通过提取结果分析及野外调研,表明高空间分辨率遥感数据处理与分析为离子吸附性稀土矿矿山环境快速、动态监测提供了良好的技术手段。 相似文献
44.
Using very high resolution remote sensing for the management of coral reef fisheries: Review and perspectives 总被引：1，自引：0，他引：1
Coral reef fisheries are critical for food security and as a source of income in developing and developed countries, but they are collapsing in many areas. Following the emergence and routine availability of commercial very high spatial resolution (0.6-10 m) multispectral satellite images, we reviewed the use of these new high-quality remote sensing data and products for coral reef fisheries management. The availability of habitats maps improves management by guiding sampling strategies, mapping resources, involving local communities, identifying conservation areas, and facilitating Ecosystem Based Fishery Management (EBFM) approaches. However, despite their potential, very little use of products designed specifically for fishery management can be reported, likely due to high costs, inherent technology limitations and lack of awareness on the possibilities. Given the theoretical benefits brought by relevant habitat maps in EBFM frameworks, we advocate the use of adequate remote sensing products that integrate fishery technical services demands and local requirements. 相似文献
45.
Akhmad SolikhinJean-Claude Thouret Avijit GuptaAndy J.L. Harris Soo Chin Liew 《Geomorphology》2012,138(1):364-379
The paper illustrates the application of high-spatial resolution satellite images in interpreting volcanic structures and eruption impacts in the Tengger-Semeru massif in east Java, Indonesia. We use high-spatial resolution images (IKONOS and SPOT 5) and aerial photos in order to analyze the structures of Semeru volcano and map the deposits. Geological and tectonic mapping is based on two DEMs and on the interpretation of aerial photos and four SPOT and IKONOS optical satellite images acquired between 1996 and 2002. We also compared two thermal Surface Kinetic Temperature ASTER images before and after the 2002-2003 eruption in order to delineate and evaluate the impacts of the pyroclastic density currents. Semeru's principal structural features are probably due to the tectonic setting of the volcano. A structural map of the Tengger-Semeru massif shows four groups of faults orientated N40, N160, N75, and N105 to N140. Conspicuous structures, such as the SE-trending horseshoe-shaped scar on Semeru's summit cone, coincide with the N160-trending faults. The direction of minor scars on the east flank parallels the first and second groups of faults. The Semeru composite cone hosts the currently active Jonggring-Seloko vent. This is located on, and buttressed against, the Mahameru edifice at the head of a large scar that may reflect a failure plane at shallow depth. Dipping 35° towards the SE, this failure plane may correspond to a weak basal layer of weathered volcaniclastic rocks of Tertiary age. We suggest that the deformation pattern of Semeru and its large scar may be induced by flank spreading over the weak basal layer of the volcano. It is therefore necessary to consider the potential for flank and summit collapse in the future. The last major eruption took place in December 2002-January 2003, and involved emplacement of block-and-ash flows. We have used the 2003 ASTER Surface Kinetic Temperature image to map the 2002-2003 pyroclastic density current deposits. We have also compared two 10 m-pixel images acquired before and after the event to describe the extent and impact of an estimated volume of 5.45 × 106 m3 of block-and-ash flow deposits. An ash-rich pyroclastic surge escaped from one of the valley-confined block-and ash flows at 5 to 8 km distance from the crater and swept across the forest and tilled land on the SW side of the Bang River Valley. Downvalley, the temperature of the pyroclastic surge decreased and a mud-rich deposit coated the banks of the Bang River Valley. Thus, hazard mitigation at Semeru should combine: (1) continuous monitoring of the eruptive activity through an early-warning system, and (2) continuous remote sensing of the morphological changes in the drainage system due to the impact of frequent pyroclastic density currents and lahars. 相似文献
46.
利用IKONOS立体像对提取南极菲尔德斯半岛地区DEM及其精度分析 总被引：2，自引：0，他引：2
本文讨论了IKONOS立体像对提取南极菲尔德斯半岛地区的DEM及其精度情况。由于IKONOS不提供基于共线模型所需的卫星星历参数,而提供基于有理函数(RPC)的近似模型,因此点位精度和高程精度主要由RPC模型精度来决定。直接使用RPC模型对参考级(Reference)产品进行DEM提取,其点位精度和高程精度为25m(CE90)、22m(LE90),这种精度不能满足高精度制图的要求。为了提高精度,利用中国第23次南极考察队(2006/2007)采集的控制点对RPC模型进行修正。通过对比分析表明DEM精度明显提高,影像和DEM分别能满足1∶5000比例尺遥感平面图制图要求和1∶10000比例尺地形图制图要求。 相似文献
47.
IKONOS立体像对提取DEM及正射纠正的实验研究 总被引：3，自引：0，他引：3
利用高分辨率的IKONOS立体像对进行DEM的提取及对影像进行单片正射纠正，这是IKONOS影像用于立体测图的基础。进行上述处理必须建立IKONOS影像成像模型，即有理函数模型，在分析有理函数模型的基础上，阐述了上述操作的原理，并通过实验进行了论证。 相似文献
48.
简要介绍了IKONOS卫星遥感影像适用于地理信息产品生产的特点，然后通过试验生产，并与传统的航片相比较，详细分析了利用IKONOS影像作为数据源生产1：10000基础信息产品在精度、生产流程、工作效率、生产周期、外业工作量和价格等方面的情况。 相似文献
49.
针对地质遗迹资源调查依靠野外考察效率低、成本高及容易造成资源遗漏问题,将高空间分辨率卫星遥感技术引入地质灾害遗迹调查评价。基于IKONOS多光谱数据进行自然彩色变换,采用乘积法变换与全色数据进行融合,将遥感数据与DEM数据叠加生成三维遥感影像图,在遥感解译和野外调查的基础上,对莲花寺高速远程滑坡的形态特征、堆积体结构、成灾范围、成因机理及动力学过程进行研究,为陕西华县莲花寺滑坡地质遗迹评价提供直接的依据。研究结果表明:高空间分辨率卫星遥感技术应用于地质灾害遗迹调查评价,相对于传统野外考察等手段具有无比的优势。陕西华县莲花寺高速远程滑坡类型、特征、规模具有国际性对比意义,属国际罕见的滑坡灾害遗迹点,其稀有性对于研究高速远程滑坡这类特殊地质景观具有重要的现实意义,具有极高的科考研究和科普教育价值。 相似文献
50.
青海省聚乎更煤矿区矿山地质环境遥感监测及质量评价 总被引：6，自引：0，他引：6
以2011年和2012年获取的2期IKONOS2数据为信息源,在波段组合、数据融合和正射纠正等图像预处理基础上,针对矿山地质环境问题进行人机交互解译,对青海省木里煤田聚乎更煤矿区因煤矿开发而引发的矿山地质环境问题及矿山环境恢复治理情况进行了遥感调查与监测;并将矿山环境调查结果与矿区基础地理及地质资料相结合,根据矿区环境的实际状况,合理选择矿山地质环境评价因子及权重指标,对该矿区的矿山地质环境质量进行了动态评价。结果表明:聚乎更煤矿区的矿山地质环境质量呈明显下降的趋势,2012年采矿活动对矿山地质环境有影响的面积较2011年增加了近10 km2,主要是地表植被直接或间接地受到破坏,且矿山环境恢复治理工作进程远远跟不上矿山环境恶化速度。 相似文献