Results 11 to 20 of about 506,179 (291)

Spatial distribution of urban basic education resources in Shanghai: Accessibility and supply-demand matching evaluation

open access: yesOpen Geosciences, 2023
This article focuses on Shanghai as a case study and utilizes various factors such as points of interest, nighttime lights, land use, road networks, and Digital Elevation Model to examine the spatial distribution of population.
Yuan Hongfu, Yang Xiangguo
doaj   +1 more source

DNA damage in gill cells of Corbicula japonica exposed to natural and anthropogenic stressors

open access: yesFrontiers in Genetics, 2015
Bivalve mollusks are sensitive biomarkers of aquatic ecosystem pollution. The impact of human activities on the environmental is an ongoing and increasing problem. There are many potentially dangerous chemicals that dissolve in water.
Valentina Vladimirovna Slobodskova
doaj   +1 more source

Spatial Context-Based Local Toponym Extraction and Chinese Textual Address Segmentation from Urban POI Data

open access: yesISPRS International Journal of Geo-Information, 2020
Georeferencing by place names (known as toponyms) is the most common way of associating textual information with geographic locations. While computers use numeric coordinates (such as longitude-latitude pairs) to represent places, people generally refer ...
Xi Kuai   +5 more
doaj   +1 more source

On first order Congruences of Lines in $\mathbb{P}^4$ with irreducible fundamental Surface [PDF]

open access: yes, 2004
In this article we study congruences of lines in $\mathbb{P}^n$, and in particular of order one. After giving general results, we obtain a complete classification in the case of $\mathbb{P}^4$ in which the fundamental surface $F$ is in fact a variety-i.e.
De Poi, Pietro
core   +1 more source

A New Approach to Refining Land Use Types: Predicting Point-of-Interest Categories Using Weibo Check-in Data

open access: yesISPRS International Journal of Geo-Information, 2020
The information of land use plays an important role in urban planning and optimizing the allocation of resources. However, traditional land use classification is imprecise. For instance, the type of commercial land is highly filled with the categories of
Xucai Zhang   +3 more
doaj   +1 more source

Construction and Connectivity Stress Analysis of Urban Ecological Network in the Nansha New District

open access: yesRedai dili, 2023
Optimizing the ecological network structure and enhancing habitat connectivity are key to ensuring urban ecological security, and the combination of urban big data can more accurately reveal the stress effects of the spatial heterogeneity of human ...
Lyu Jixin   +3 more
doaj   +1 more source

The Multi-Center Spatial Structure in the Guangdong-Hong Kong-Macao Greater Bay Area Urban Agglomeration Based on Luojia1-01 Nighttime Light Data and POI Data

open access: yesRedai dili, 2022
The Guangdong-Hong Kong-Macao Greater Bay Area (referred to as "GBA") is an important strategic deployment for China's current economic development.
Zhi Qiuying   +3 more
doaj   +1 more source

On higher Gauss maps [PDF]

open access: yes, 2015
We prove that the general fibre of the $i$-th Gauss map has dimension $m$ if and only if at the general point the $(i+1)$-th fundamental form consists of cones with vertex a fixed $\mathbb P^{m-1}$, extending a known theorem for the usual Gauss map.
De Poi, Pietro, Ilardi, Giovanna
core   +2 more sources

Towards POI-based large-scale land use modeling: spatial scale, semantic granularity, and geographic context

open access: yesInternational Journal of Digital Earth, 2023
The combination of spatial distribution, semantic characteristics, and sometimes temporal dynamics of POIs inside a geographic region can capture its unique land use characteristics.
Junchuan Fan, Gautam Thakur
doaj   +1 more source

A new method to explore the abnormal space of urban hidden dangers under epidemic outbreak and its prevention and control: A case study of Jinan City

open access: yesOpen Geosciences, 2022
In recent years, the proliferation of coronavirus disease has profoundly affected the world. The vitality of urban space is difficult to recover in the short term.
Sun Ming, Ren Qimeng
doaj   +1 more source

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