Evaluation of eco-environmental quality in central urban areas of Tianjin City based on multi-temporal remote sensing images

Classification of levels	Range of values	Description
Fail	0 ≤ $I_{R S E}$ ≤ 0.2	The poor ecological environment of the city has greatly restricted the normal life of its people
Poor	0.2 < $I_{R S E}$ ≤ 0.4	The poor ecology of the city, the arid climate, the low vegetation cover of the city and the significant constraints on the normal life of the urban population
Average	0.4 < $I_{R S E}$ ≤ 0.6	The ecological environment of the city is suitable, the city has a medium level of vegetation cover, suitable for the normal life activities of the people of the city, with few constraints
Good	0.6 < $I_{R S E}$ ≤ 0.8	The urban ecological environment meets the conditions of people's living activities and has a high level of vegetation cover
Excellent	0.8 < $I_{R S E}$ ≤ 1.0	An urban ecology that maximises the conditions for people's living activities, with a stable urban ecology and high vegetation cover

Table 2. Statistical table of the pixel number of RSEI indicators and their percentage

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Table 2. Statistical table of the pixel number of RSEI indicators and their percentage

Grade of RSEI	2014		2016		2018
Grade of RSEI	Number of pixels	Percentage/%	Number of pixels	Percentage/%	Number of pixels	Percentage/%
1: (0～0.2]	203	0.10	7829	3.98	7294	3.69
2: (0.2～0.4]	16612	8.44	71711	36.45	57813	29.24
3: (04～0.6]	121905	61.97	75706	38.48	87860	44.44
4: (0.6～0.8]	56287	28.61	31493	16.01	37512	18.97
5: (0.8～1.0]	1709	0.87	10025	5.09	7227	3.66

Table 3. Table of percentage distribution of changes in RSEI in the central city of Tianjin from 2016 to 2018
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Table 3. Table of percentage distribution of changes in RSEI in the central city of Tianjin from 2016 to 2018
Level of change Percentage/%
Significantly worse 11.6
Slightly worse 22.1
No significant change 17.1
Slightly better 31.3
Significantly better 17.9

Table 4. Correlation matrix of the 4 indicators and RSEI

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Table 4. Correlation matrix of the 4 indicators and RSEI

	2014					2016					2018
	Wet	NDVI	LST	NDBSI	RSEI	Wet	NDVI	LST	NDBSI	RSEI	Wet	NDVI	LST	NDBSI	RSEI
Wet	1.000	0.880	-0.602	-0.833	0.932	1.000	0.855	-0.583	-0.908	0.915	1.000	0.855	-0.636	-0.818	0.934
NDVI	0.880	1.000	-0.483	-0.611	0.957	0.855	1.000	-0.485	-0.877	0.841	0.855	1.000	-0.530	-0.765	0.881
LST	-0.602	-0.484	1.000	0.690	-0.609	-0.583	-0.485	1.000	0.560	-0.672	-0.636	-0.530	1.000	0.627	-0.714
NDBSI	-0.833	-0.611	0.690	1.000	-0.625	-0.908	-0.877	0.560	1.000	-0.700	-0.818	-0.765	0.627	1.000	-0.631
Average correlation	0.777	0.658	0.592	0.711	0.781	0.782	0.739	0.543	0.782	0.782	0.770	0.717	0.598	0.737	0.790

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Yang HU, Wei GAO, Jie YANG. Evaluation of eco-environmental quality in central urban areas of Tianjin City based on multi-temporal remote sensing images[J]. Journal of Atmospheric and Environmental Optics, 2023, 18(2): 168

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