The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Crop planting area is significant to agricultural structure adjustment and regional food balance policy. Based on field investigation and spectral property analysis of corn in HJ1-CCD images, different threshold configurations are set to build decision trees and corn planting area is precisely extracted utilizing multi-temporal HJ-1 CCD images in Zhecheng county, Henan Province of China. Both statistical...
Taking Jinjiang watershed of Fujian province in China as study area, this work examines the effects of DEM resolutions, ranging from 30m to 600m, on Nash efficiencies of rainstorm flood simulation based on HEC-HMS model. Another focus is the influence of sub-basin division on flood simulation results. The study indicates that, with the decreasing of DEM resolution, basin slope, among other parameters...
This paper focuses on the detection of land cover change in Beijing using TM data collected on 22 May, 2002 and 20 May, 2010 respectively. For detailed analyzing the land cover change in different parts of Beijing, the central Beijing enclosed by fifth ring road was divided into 4 areas based on the ring roads. After image registration, mask and image clip, sample data of land cover types as water...
Large-scale man-made linear features has played more and more important role in modern life and the development of urban are seriously affected by the subsidence of them. Permanent Scatterers (PS) technology was developed as a powerful tool for subsidence monitoring. High resolution of 1m data can be provided by TerraSAR X-band (TSX) with a short revisit period of 11 days. More detail and sensitive...
Detailed description of land use/land cover change of China during the past hundred years not only help us understand the impacts of human-induced land use/land cover change on climate change and carbon cycles, but also reflect the true role of land use/land cover change of China in the global climate change. Hence, this article tries to propose a methodological framework on the reconstruction of...
This paper aims at developing a fusion method based on SVR (Synthetic Variable Ratio) to preserve spatial details and spectral characteristics in image fusion processing, coupling several experiments are conducted for different kinds of sensors (ETM+, QuickBird), and fusion performance evaluation results show that this method is not related to sensor type, spectral region of images and number of multispectral...
Global land cover data plays an important role on the global change research. At present, there are a variety of global land cover datasets. Those datasets are based on different classification systems and employ different methodologies. The inconsistencies may be a problem for studies of global change. This study analyzes the consistency of MCD12Q1 and Globcover datasets using type area consistency...
Precipitation is a major source of freshwater in water cycle. Accurate information and spatial details of water availability are important to arid and semi-arid areas. This study examined the relationships between vegetation cover and rainfall variability in Australia from 2000 to 2008. Vegetation index can be treating as a proxy of precipitation. By linear regression of the EVI values to the rainfall...
Retrieval of chlorophyll-a concentration using multi-source remote sensing images is one of the trends of inland water quality monitoring by remote sensing. In this paper, Lake Taihu in the east of China was selected as the study site. Based on the analysis of the spatial heterogeneity using measured data and semi-variance function, a method for up scaling 30m spatial resolution chla concentration...
With the rapid development of earth observation, remote sensing and geographic information system technology, human can achieve a huge sum of spatial data. Spatial data distribution is the main aspect of spatial information services. One of the main contradictions is that the current limited network bandwidth cannot meet the request for achieving realtime space data. Global Subdivision proposed a...
During past decades, land use and land cover change detection techniques have undergone substantial development. However, different scenarios and an integrated workflow linking remote sensing imagery and GIS are often neglected. As a result, we develop a land use and land cover change detection and extraction system and propose five scenarios considering data availability and different classification...
A novel multiresolution cell complex model (MCM) is presented in this paper. As an extension to MSM, the intrinsic structure of MC is discussed in detail, which is described by a novel topological structure BUBBLE node applied on complex locally and efficiently. For the first time, a basic transforming group based on BUBBLE node is built which unifies the traditional complex specific operations under...
Spatial distribution of research activities in geo-sciences is related not only to the distribution of authors but also to the distribution of research area. In the present work we developed a tool to analyze spatial distribution of science research activities based on toponym resolution in text of scientific papers. The idea is to identify and annotate toponym referred in research papers automatically,...
In the past decade, the ensemble of classifiers such as decision trees has been proposed as a new strategy for the improvement of the performance of individual tree classifiers. However, it posed a new challenge of feature selection for high-dimensional data classification. The traditional feature ranking methods for individual tree was not suitable for the AdaBoost trees algorithm. In this study,...
Despite its high spatial resolution (15m), the 60km swath width of Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) can limit the effectiveness of accurately large-scale study. One possible solution is to down scale low spatial resolution but width swath satellite image data (e.g. Landsat TM/ETM+ with spatial resolution 30m and swath width 185km). This paper proposed a method...
The Leaf Area Index (LAI) is key feature to describe the forest ecophysiological processes. In previous studies, LAI was retrieved using remote sensing data mostly in rural areas. The objective of this study was to investigate the possibility of mapping LAI in the urban areas of Nanjing, China using high resolution remote sensing data. LAI measured with the TRAC instruments was used in conjunction...
This paper proposed a winter wheat extraction and estimation model for Jiangsu province, China, using HJ multi temporal images and MODIS-VI time series. The illustrations of winter wheat's representative phenological calendar features presented on EVI series are taken as optimal indicators. Combined with field surveys, HJ EVI and NDVI features are depicted, and winter wheat area on typical research...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.