搜索结果: 1-15 共查到“理学 cover”相关记录137条 . 查询时间(0.129 秒)
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：A 1.344-approximation algorithm for the vertex cover problem
顶点覆盖问题 1.344 近似算法
2023/12/11
We present an algorithm for the vertex cover problem by combining the LP relaxation and the random edge-reductions. The algorithm has the expected approximation ratio of 1.344.
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Streaming algorithm for submodular cover problem
子模块化 覆盖问题 流算法
2023/5/15
In this work, we mainly investigate the problem that minimizes the price function such that the valuation function exceeds a required threshold in submodular cover problem, where the price function is...
SEMI AUTOMATED LAND COVER LAYER UPDATING PROCESS UTILIZING SPECTRAL ANALYSIS AND GIS DATA FUSION
NTDB (National Topographic Data Base), Segmentation, Classification, nDSM, data fusion
2018/5/11
Technological improvements made in recent years of mass data gathering and analyzing, influenced the traditional methods of updating and forming of the national topographic database. It has brought a ...
APPLICATION OF MACHINE LEARNING IN URBAN GREENERY LAND COVER EXTRACTION
Neural Network Machine Learning Greenery Land Cover Auto Extraction Multispectral Image
2018/5/15
Urban greenery is a critical part of the modern city and the greenery coverage information is essential for land resource management, environmental monitoring and urban planning. It is a challenging w...
VEGETATION COVER ANALYSIS IN SHAANXI PROVINCE OF CHINA BASED ON GRID PIXEL TERND ANALYSIS AND STABILITY EVALUATION
Vegetation MODIS NDVI Trend analysis Stability evaluation Shaanxi
2018/5/16
As a key factor affecting the biogeochemical cycle of human existence, terrestrial vegetation is vulnerable to natural environment and human activities, with obvious temporal and spatial characteristi...
Virginia Tech researchers explore causes of land cover change in African savannas（图）
Virginia Tech researchers land cover change African savannas
2017/11/23
A new study by Virginia Tech researchers tracks land cover changes in the Chobe district of Northern Botswana and provides information that will allow governments and nonprofit organizations to improv...
Land cover change in Botswana savannas:Don't blame the elephants（图）
Land cover change Botswana savannas Don't blame the elephants
2017/11/23
Why are drylands changing in the Chobe district of Northern Botswana? A new study tracks differences in the savanna there across 30 years, and provides information that will allow governments and non-...
FOREST COVER MAPPING IN ISKANDAR MALAYSIA USING SATELLITE DATA
Forest Cover Deforestation Distubance CLASlite Remote Sensing Malaysia
2016/10/14
Malaysia is the third largest country in the world that had lost forest cover. Therefore, timely information on forest cover is required to help the government to ensure that the remaining forest reso...
HySenS data exploitation for urban land cover analysis
hyperspectral remote sensing urban land use vegetation distribution classification
2015/9/7
This paper addresses the use of HySenS airborne hyperspectral data for environmental urban monitoring. It is known that hyperspectral data can help to characterize some of the relations between soil c...
Vegetation cover analysis using a low budget hyperspectral proximal sensing system
hyperspectral proximal sensing unable filters vegetation classification
2015/9/7
This report describes the implementation of a hyperspectral proximal sensing low-budget acquisition system and its application to the detection of terrestrian vegetation cover anomalies in sites of hi...
Plant functional type classification for earth system models:results from the European Space Agency's Land Cover Climate Change Initiative
Plant functional type classification earth system models European Space Agency Land Cover Climate Change Initiative
2015/8/6
Global land cover is a key variable in the earth system with feedbacks on climate, biodiversity and natural resources. However, global land cover data sets presently fall short of user needs in provid...
Spatially Distributed Watershed Mapping and Modeling: Thermal Maps and Vegetation Indices to Enhance Land Cover and Surface Microclimate mapping (part 1)
surface temperature vegetation indices Landsat land cover microclimate unsupervised classification
2015/8/6
The extent and type of watershed cover affects the movement of water in the hydrologic cycle, thus accurate representation of the physical and biological features of the landscape within the watershed...
Land Use/Land Cover Changes and Groundwater Potential Zoning in and around Raniganj coal mining area, Bardhaman District, West Bengal - A GIS and Remote Sensing Approach
Land Use Land Cover Groundwater Zoning
2015/8/6
The Raniganj area has a long history of coal mining starting from 1744. This has resulted in major change in land use pattern and high groundwater abstraction leading to drinking water crisis especial...
A RATIONAL APPROACH TO DIGITAL ANCILLARY DATA ACCESS AND VISUALIZATION IN LAND COVER, LAND USE PROJECTS
Land Cover Land Use Interpretation aerial photographs Rectification Orthorectification database GIS
2015/7/29
During the last decade many national and regional Land Cover/Land Use projects are implemented based on computer aided satellite
image interpretation. An essential procedure for the European CORINE ...
CHANGES IN THE LAND COVER AND LAND USE OF THE ITACAIúNAS RIVER WATERSHED, ARC OF DEFORESTATION, CARAJáS, SOUTHEASTERN AMAZON
Landsat, change detection, object based image analysis
2015/5/7
Human actions are changing the Amazon’s landscape by clearing tropical forest and replacing it mainly by pasturelands. The focus of this work is to assess the changes in the Itacaiúnas River watersh...