scholarly journals Measuring Spatial Distribution Characteristics of Heavy Metal Contaminations in a Network-Constrained Environment: A Case Study in River Network of Daye, China

2017 ◽  
Vol 9 (6) ◽  
pp. 986 ◽  
Author(s):  
Zhensheng Wang ◽  
Ke Nie
Keyword(s):  
Heavy Metal ◽  
Spatial Distribution ◽  
River Network ◽  
Distribution Characteristics ◽  
Spatial Distribution Characteristics

scholarly journals Identification of Urban Functional Areas Based on POI Data: A Case Study of the Guangzhou Economic and Technological Development Zone

2019 ◽  
Vol 11 (5) ◽  
pp. 1385 ◽  
Author(s):  
Yunfeng Hu ◽  
Yueqi Han
Keyword(s):  
Spatial Distribution ◽  
Technological Development ◽  
High Tech ◽  
Main Function ◽  
Distribution Characteristics ◽  
Functional Area ◽  
Development Zone ◽  
Spatial Distribution Characteristics ◽  
Functional Areas

Functional areas are the basic spatial units in which cities or development zones implement urban plans and provide functions. Internet map big data technology provides a new method for the identification and spatial analysis of functional areas. Based on the POI (point of interest) data from AMap (a map application of AutoNavi) from 2017, this paper proposes an urban functional areas recognition and analysis method based on the frequency density and the ratio of POI function types. It takes the Guangzhou Economic and Technological Development Zone as a case study to analyze the main function and spatial distribution characteristics of the detailed functional areas. The research shows the following: (1) The POI frequency density index and the function type ratio can effectively distinguish the functions of the grid units and analyze the spatial distribution characteristics of a complex functional area. (2) The single functional area is the most common area type in the Guangzhou Economic and Technological Development Zone. The largest proportion of all areas is allocated to traditional manufacturing industry functional areas, followed by high-tech enterprises, catering and entertainment, real estate, and education and health care, in descending order. The smallest proportion is allocated to finance and insurance functional areas. (3) The current layout of the functional areas in the Guangzhou Economic and Technological Development Zone conforms to the overall requirements and planning objectives of the central and local government. The layout and agglomeration of different blocks within the economic development zone are consistent with local industry’s target orientation and development history.

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