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Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：International trade and Covid-19: City-level evidence from China's lockdown policy
国际贸易 新冠肺炎 中国封锁政策 城市证据
2023/5/16
We examines the impact of Covid-19 lockdowns on exports by Chinese cities. We use city-level export data at a monthly frequency from January 2018 through April 2020. Differences-in-differences estimat...
Weather surveillance radar data shows 45 million insects taking flight over brightly lit city（图）
Weather surveillance radar data 45 million insects flight lit city
2021/4/16
The expansion of artificial night lights globally has had important impacts on animal behavior and health. A new study led by researchers at the University of Oklahoma on the effects of brig...
Researchers set to take to the air above the Arctic and New York City（图）
air above Arctic New York City
2020/10/10
Atmospheric scientists are embarking on two new research projects supported by the U.S. National Science Foundation that involve using sophisticated planes to understand the atmospheric chemistry and ...
EXPLORING SIMILARITIES AND VARIATIONS OF HUMAN MOBILITY PATTERNS IN THE CITY OF LONDON
time-series cluster analysis smart card data human mobility spatiotemporal patterns
2018/11/9
The availability of new spatial data represents an unprecedented opportunity to better understand and plan cities. In particular, extensive data sets of human mobility data supply new information that...
ECOLOGICAL CARRYING CAPACITY OF LAND USE CHANGES IN DA’AN CITY
Land use Ecological Carrying Capacity Da 'an
2018/5/15
Based on GIS and RS technology, this paper analyzed the land use change in Da'an city from 1995 to 2010. land-use ecological evaluation index was constructed to evaluate the land-use ecological risk o...
THE RESEARCH AND COMPILATION OF CITY MAPS IN THE NATIONAL GEOMATICS ATLAS OF THE PEOPLE'S REPUBLIC OF CHINA
new century version of National Geomatics Atlas of the People's Republic of China map visualization map symbol cartographic generalization mapping scope city map
2018/5/15
The research and compilation of new century version of the National Huge Atlas of the People's Republic of China is the special basic work project by Ministry of Science and Technology of the People's...
ESTIMATING HOUSING VACANCY RATE IN QINGDAO CITY WITH NPP-VIIRS NIGHTTIME LIGHT AND GEOGRAPHICAL NATIONAL CONDITIONS MONITORING DATA
Housing vacancy rate (HVR) NPP-VIIRS Nighttime light data Geographic National Conditions Monitoring Data (GNCMD) resident population distribution data SVM Moran's I
2018/5/15
Accompanying China's rapid urbanization in recent decades, especially in the new millennium, the housing problem has become one of the most important issues. The estimation and analysis of housing vac...
URBAN SHANTY TOWN RECOGNITION BASED ON HIGH-RESOLUTION REMOTE SENSING IMAGES AND NATIONAL GEOGRAPHICAL MONITORING FEATURES – A CASE STUDY OF NANNING CITY
Gray-level co-occurrence matrix shanty town residential suitability nearest neighbour
2018/5/14
Urban shanty towns are communities that has contiguous old and dilapidated houses with more than 2000 square meters built-up area or more than 50 households. This study makes attempts to extract shant...
The analyses focusing on formation mechanism of Nanzhangzhuang ground fissure in Hengshui City, China
Ground fissure Mechanism analysis Intersection faults Deep ground water Landform and lithology
2018/3/23
The paper focuses on the formation of Nanzhangzhuang ground fissure through emphatically analysing factors including the intersection fault dislocation, the deep ground-water over-exploitation togethe...
ESTIMATION OF SOLAR ENERGY ON VERTICAL 3D BUILDING WALLS ON CITY QUARTER SCALE
Urban photovoltaic potential vertical walls renewable energy 3D building model
2016/10/14
In urban areas, solar energy is one promising source of renewable energy to achieve the EU parliament’s goal of reducing CO2 emissions by 20 % compared to 1990. Although annual radiation on vert...
SPACE PARTITIONING FOR PRIVACY ENABLED 3D CITY MODELS
Urban Area 3D Buildings Privacy LOD Anonymization Cartographic Generalization Straight Skeleton
2016/10/14
Due to recent technological progress, data capturing and processing of highly detailed (3D) data has become extensive. And despite all prospects of potential uses, data that includes personal living s...
INVESTIGATING THE ENRICHMENT OF A 3D CITY MODEL WITH VARIOUS CITYGML MODULES
3D Modeling Trimble SketchUp FME CityGML Modules semantics 3D City Model
2016/10/14
Recent developments in the massive 3D acquisition area made possible the generation of dense and precise 3D data, ranging from the representation of a simple building to a whole city. Nowadays, increa...
High-density macroseismic survey in urban areas. Part 1: proposal for a methodology and its application to the city of Rome
urban area high-density macroseismic survey questionnaire urban geology Rome
2015/10/8
The aim of this research is to provide an original contribution to the investigation of local macroseismic variations in urban areas by means of questionnaire surveys. In this paper, we propose a meth...
Information on subsoil geological structure in the city of Catania (Eastern Sicily) from microtremor measurements
microtremors H/V technique sire response subsoil geological structure
2015/9/28
Nakamuras technique, or the H/V spectral ratio method, has been applied to microtremor measurements carried out in the urban area of Catania (Eastern Sicily) to obtain information on the geological st...
To create a safe city free from natural disasters has been one of the important criteria in city planning. Since large cities have suffered from large fires caused by earthquakes, the planning of open...