GeoSwath与Klein 3000的综合对比及实验分析     

张济博  陶炳淑  贾忠媛  蒋维杰  苟诤慷  闻锋 《海洋学研究》2015,33(2):57-63

GeoSwath Plus系统利用相干原理能同时得到水深数据和声纳图,与传统侧扫声纳存在一定差异。本文对GeoSwath Plus 125 kHZ系统和Klein 3000系统从工作原理、技术参数、数据采集和后处理平台以及实测数据等方面进行了对比。结果表明:二者接收数据存在差异,导致两者的用途也存在差异;GeoSwath Plus系统相比Klein 3000更加复杂,但适用水深范围较小;GeoSwath Plus采集软件较少,对后处理软件的要求更高,而Klein 3000数据采集和后处理软件都有多种选择;通过实测数据的比较发现,GeoSwath Plus的定位精度更高,但由于发射波束水平开角大于Klein 3000,加之采用悬挂式安装,导致得到的声纳图像对比度和分辨率比传统侧扫声纳Klein 3000要差一些。  相似文献   

High-resolution remote sensing mapping of global land water     

AnPing Liao  LiJun Chen  Jun Chen  ChaoYing He  Xin Cao  Jin Chen  Shu Peng  FangDi Sun  Peng Gong 《中国科学:地球科学(英文版)》2014,57(10):2305-2316

Land water, one of the important components of land cover, is the indispensable and important basic information for climate change studies, ecological environment assessment, macro-control analysis, etc. This article describes the overall study on land water in the program of global land cover remote sensing mapping. Through collection and processing of Landsat TM/ETM+, China’s HJ-1 satellite image, etc., the program achieves an effective overlay of global multi-spectral image of 30 m resolution for two base years, namely, 2000 and 2010, with the image rectification accuracy meeting the requirements of 1:200000 mapping and the error in registration of images for the two periods being controlled within 1 pixel. The indexes were designed and selected reasonably based on spectral features and geometric shapes of water on the scale of 30 m resolution, the water information was extracted in an elaborate way by combining a simple and easy operation through pixel-based classification method with a comprehensive utilization of various rules and knowledge through the object-oriented classification method, and finally the classification results were further optimized and improved by the human-computer interaction, thus realizing high-resolution remote sensing mapping of global water. The completed global land water data results, including Global Land 30-water 2000 and Global Land 30-water 2010, are the classification results featuring the highest resolution on a global scale, and the overall accuracy of self-assessment is 96%. These data are the important basic data for developing relevant studies, such as analyzing spatial distribution pattern of global land water, revealing regional difference, studying space-time fluctuation law, and diagnosing health of ecological environment.  相似文献   

遥感技术在国际工程地形图修测中的应用研究          下载免费PDF全文

王庆玉 《地质找矿论丛》2004,19(1):48-50

进行国际工程建设,应用Ikonos高分辨率卫片结合外业地面测量,提取空间地理信息,修测1:10 000地形图,其方法是可靠和可行的.  相似文献   

Assessing impervious area ratios of grid-based land-use classifications on the example of an urban watershed     

Tatsuya Koga  Akira Kawamura  Hideo Amaguchi  Hiroto Tanouchi 《水文科学杂志》2016,61(9):1728-1739

ABSTRACT

When applying a distributed hydrological model in urban watersheds, grid-based land-use classification data with 10 m resolution are typically used in Japan. For urban hydrological models, the estimation of the impervious area ratio (IAR) of each land-use classification is a crucial factor for accurate runoff analysis. In order to assess the IAR accurately, we created a set of vector-based “urban landscape GIS delineation” data for a typical urban watershed in Tokyo. By superimposing the vector-based delineation map on the grid-based map, the IAR of each grid-based land-use classification was estimated, after calculating the IARs of all grid cells in the entire urban watershed. As a result, we were able to calculate the frequency distribution of IAR for each land-use classification, as well as the spatial distribution of IARs for the urban watershed. It is evident from the results that the reference values of IAR for the land-use classifications were estimated very roughly and inherited errors of between about 7% and 70%, which corresponds to more than 100 mm increase of direct runoff for the 1500 mm annual average precipitation.