Journal of Geo-information Science >
A Measure of Block Scale Urban Green Index in Urban Area based on Grid Method
Received date: 2021-11-19
Revised date: 2022-02-08
Online published: 2022-10-25
Supported by
The Strategic Priority Research Program of Chinese Academy of Science(XDA23100504)
To quantify urban green space using remote sensing data, this paper proposed a grid-based urban green space measurement method at city block scale. The grid unit of 900 m×900 m was set to represent the block scale formed by the main road of the city. The vegetation coverage and vegetation composition were used together to generate the green index in each unit. Unlike the green index calculated by the traditional grid method based on the proportion of vegetation area, the green index in this paper enhanced urban greenness information particularly in areas with moderate to high vegetation coverage. We applied this method in Beijing city and diagnosed the spatiotemporal differences of local urban green space over years. We used Landsat TM/OLI datasets of 2009, 2015, and 2019 in spring, summer, and autumn, respectively. Results showed that both the quantity and quality of urban green space in Beijing have increased significantly from 2009 to 2019, especially in autumn. The changes of urban green space showed different patterns inside and outside of the Fourth Ring Road. Vegetation coverage showed an increase within the Fourth Ring Road, while outside the Fourth Ring Road, there was a significant increase in both vegetation coverage and quality.
LIAO Zhouwei , GUAN Yanning , GUO Shan , CAI Danlu , YU Min , YAO Wutao , ZHANG Chunyan , DENG Rui . A Measure of Block Scale Urban Green Index in Urban Area based on Grid Method[J]. Journal of Geo-information Science, 2022 , 24(8) : 1475 -1487 . DOI: 10.12082/dqxxkx.2022.210743
图2 研究区绿度指标构成示意图(2019年8月17日)Fig. 2 Schematic diagram of green index composition in study area (August 17, 2019) |
表1 不同类型绿度指标对应地表绿化概况Tab. 1 Different types of green index correspond to the status of surface greening |
绿度指标 | 对应地表绿化特征 |
---|---|
低盖低植 | 单位面积内植被较少,且基本单元内绿化构成主体为冠层繁茂程度和多样性水平较低,总体情况相对较差的植被 |
低盖中植 | 单位面积内植被较少,基本单元内绿化构成主体植被情况处于中等水平 |
低盖高植 | 单位面积内植被较少,但基本单元内绿化构成主体为冠层繁茂程度、多样性水平较高,总体情况良好的植被 |
中盖低植 | 单位面积内植被数量中等,但基本单元内绿化构成主体为冠层繁茂程度和多样性水平较低,总体情况相对较差的植被 |
中盖中植 | 单位面积内植被数量中等,基本单元内绿化构成主体植被情况处于中等水平 |
中盖高植 | 单位面积内植被数量中等,但基本单元内绿化构成主体为冠层繁茂程度、多样性水平较高,总体情况良好的植被 |
高盖低植 | 单位面积内植被较多,但基本单元内绿化构成主体为冠层繁茂程度和多样性水平较低,总体情况相对较差的植被 |
高盖中植 | 单位面积内植被较多,但基本单元内绿化构成主体植被情况处于中等水平 |
高盖高植 | 单位面积内植被较多,且基本单元内绿化构成主体为冠层繁茂程度、多样性水平较高,总体情况良好的植被 |
表2 数据时相Tab. 2 Acquisition date |
年份 | 春季 | 夏季 | 秋季 |
---|---|---|---|
2009 | 20090517/TM | 20090720/TM | 20090922/TM |
2015 | 20150518/OLI | 20150822/OLI | 20150923/OLI |
2019 | 20190513/OLI | 20190817/OLI | 20190918/OLI |
图5 基于高分二号影像的本文绿度指标和传统绿度指数实地对比验证Fig. 5 Comparison and verification of two green indexs based on GF-2 Image |
表3 基于网格单元的绿度指标差异对比Tab. 3 Comparison of green index differences |
指标 | 本文绿度指标 | |||
---|---|---|---|---|
低盖低植/中盖低值/高盖低植 | 低盖中植/中盖中值/高盖中植 | 低盖高植/中盖高值/高盖高植 | ||
传统网格法计 算的绿度指数 | 低覆盖度 | 10 | 0 | 0 |
中覆盖度 | 7 | 3 | 0 | |
高覆盖度 | 5 | 5 | 0 |
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