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Frontiers of Earth Science

ISSN 2095-0195

ISSN 2095-0209(Online)

CN 11-5982/P

Postal Subscription Code 80-963

2018 Impact Factor: 1.205

Front. Earth Sci.    2018, Vol. 12 Issue (3) : 521-531    https://doi.org/10.1007/s11707-017-0672-x
RESEARCH ARTICLE
Remote sensing study of wetlands in the Pearl River Delta during 1995---2015 with the support vector machine method
Xiaosong HAN, Jiayi PAN(), Adam T. DEVLIN
Institute of Space and Earth Information Science, The Chinese University of Hong Kong, Hong Kong, China
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Abstract

In recent years, the Pearl River Delta has experienced rapid economic growth which may create a substantial burden to its ecology. In this study, the wetlands of the Pearl River Delta are investigated. Through the use of remote sensing methods, we analyze spatial and temporal variations of wetlands in this area over the past twenty years. The support vector machine (SVM) method is proven to be an effective approach for classifying the wetlands of the Pearl River Delta, and the total classification resolution reaches 94.94% with a Kappa coefficient exceeding 0.94, higher than other comparable analysis methods. Our results show that wetland areas were reduced by 36.9% during the past twenty years. The change detection analysis method shows that there was a 95.58% intertidal zone change to other land-use types, most of which (57.12%) was converted to construction land. In addition, farmland was reduced by 54.89% during the past twenty years, 47.19% of which was changed to construction land use. The inland water area increased 19.02%, but most of this growth (18.77%) was converted from the intertidal zone.

Keywords wetland      Pearl River Delta      support vector machine method      Landsat images     
Corresponding Author(s): Jiayi PAN   
Just Accepted Date: 25 September 2017   Online First Date: 31 October 2017    Issue Date: 05 September 2018
 Cite this article:   
Xiaosong HAN,Jiayi PAN,Adam T. DEVLIN. Remote sensing study of wetlands in the Pearl River Delta during 1995---2015 with the support vector machine method[J]. Front. Earth Sci., 2018, 12(3): 521-531.
 URL:  
https://academic.hep.com.cn/fesci/EN/10.1007/s11707-017-0672-x
https://academic.hep.com.cn/fesci/EN/Y2018/V12/I3/521
Image timeSensor
December 30, 1995Landsat 4-5 TM
November 01,1997Landsat 4-5 TM
December 09, 1999Landsat 4-5 TM
December 30, 2001Landsat 4-5 TM
December 4, 2003Landsat 4-5 TM
November 23, 2005Landsat 4-5 TM
January 29, 2007Landsat 4-5 TM
November 02, 2009Landsat 4-5 TM
June 01, 2011Landsat 4-5 TM
November 29, 2013Landsat 8 OLI/TIRS
October 18, 2015Landsat 8 OLI/TIRS
Tab.1  Time and instrument of Landsat TM/OLI/TIRS images
Fig.1  The study area (red) on a Google map image (June 7, 2015).
Fig.2  11 TM/OLI/TIRS images downloaded from USGS after radiation correction and geometric rectification from 1995 to 2015.
Fig.3  Output images using the SVM classification on the original images shown in Fig. 2.
YearWaterMountain forestUrban areasInland waterCoastal wetlandFarmland
1995812362491432203667
19978685186728231261200
1999807330792511215939
20019837669888221231229
2003530792603797194716
2005956874844803127658
20077846371131768218547
2009104074210251226122732
201174671864851099383
2013923725173297086486
2015101110221585881108532
Tab.2  Statistics listing the number of testing samples used
YearTotal accuracy/%Kappa coefficient
199591.610.89
199792.240.90
199997.390.97
200194.180.93
200397.370.97
200597.370.97
200794.970.94
200995.910.95
201196.580.96
201394.620.93
201592.080.89
Tab.3  Accuracy of regional classifications in Pearl River Delta for each image used
Fig.4  The change of different land classification regions in the Pearl River Delta from 1995 to 2015.
Fig.5  (a) Population statistics in the Pearl River Delta from 1995 to 2015, showing changes in urban and rural populations, as well as total population. (b) GDP statistics in the Pearl River Delta from 1995 to 2015, (c) The total change of wetland areas in the Pearl River Delta from 1995 to 2015.
Final stateInitial state
WaterMountain forestUrban areaInland waterCoastal wetlandFarmland
Water40,839.3
(80.41%)
2.9
(0.02%)
5.3
(0.02%)
1653.0 (3.89%)6.0
(0.03%)
58.7
(0.10%)
Mountain forest9.6
(0.02%)
12,185.2
(65.68%)
703.6
(2.44%)
1019.0
(2.40%)
1201.8
(5.46%)
6295.4
(10.55%)
Urban area866.9
(1.71%)
3461.5
(18.66%)
22,687.6
(78.70%)
12,152.5
(28.57%)
12,581.7
(57.12%)
28,155.7
(47.19%)
Inland water9009.7
(17.74%)
843.3
(4.55%)
2556.4
(8.87%)
23,373.4
(54.96%)
4271.4
(19.39%)
10,564.6
(17.71%)
Coastal wetland17.8
(0.04%)
72.7
(0.39%)
87.0
(0.30%)
266.0
(0.63%)
116.3
(0.53%)
413.6
(0.69%)
Farmland48.0
(0.10%)
1987.1
(10.71%)
2787.7
(9.67%)
4065.7
(9.56%)
3848.5
(17.47%)
14,176.0
(23.76%)
Class changes9952.0
(19.59%)
6367.5
(34.32%)
6140.0
(21.30%)
19,165.2
(45.04%)
21,909.4
(99.47%)
45,488.1
(76.24%)
Image
Difference
?8226.0
(?16.20%)
2861.9
(15.43%)
51,078.3
(177.19%)
8089.2
(19.02%)
?21,052.3
(?95.58%)
?32,751.2
(?54.89%)
Tab.4  The transformational matrix for different region classifications in the Pearl River Delta between 1995 and 2015 (unit: acre)
Fig.6  Comparisons of the SVM method to other methodologies: (a) Comparisons between SVM and IsoData (1995), (b) Comparisons between SVM and Minimum Distance (1995), (c) Comparisons between SVM and Maximum Likelihood (1995).
ItemThe total accuracy/%Kappa coefficient
SVM91.610.89
IsoData59.080.49
Minimum distance60.030.50
Maximum likelihood77.690.73
Tab.5  Accuracy comparisons between SVM and IsoData, minimum distance and maximum likelihood methods
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