Change in woody cover at representative sites in the Kruger National Park, South Africa, based on historical imagery

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Table 4 Area of cover of image classification classes in the sections of the study sites that were common on the image dates (as in Fig. 4)

Study site and imagery	Class and area of cover (ha), at original image pixel size
Study site and imagery	Woody vegetation	Senescent vegetation (grass)	Dry, bare surface
(a) Stevenson-Hamilton site
1940 aerial photographs	1859.61	958.79	231.13
1968 aerial photographs	1615.89	1216.41	217.23
1977 aerial photographs	1400.53	1470.07	178.93
1940–1977 change: −25.7 %
1998 SPOT image	1353.69	1467.40	228.44
2012 SPOT image	1371.73	1553.84	123.96
1998–2012 change: +1.3 %
(b) Nhlowa site
1940 aerial photographs^a
1968 aerial photographs	635.84	2478.99	1201.30
1977 aerial photographs	625.86	3233.47	456.80
1968–1977 change: −1.6 %
1998 SPOT image	528.91	3673.27	113.95
2012 SPOT image	397.69	3192.86	725.58
1998–2012 change: −24.8 %
(c) Ngwenyeni site
1942 aerial photographs	489.52	1059.57	92.24
1968 aerial photographs	546.20	915.78	179.35
1977 aerial photographs	512.87	1073.62	54.84
1942–1977 change: +4.8 %
1998 SPOT image	744.32	799.71	97.30
2012 SPOT image	687.39	801.29	152.65
1998–2012 change: −7.6 %
(d) Mooiplaas site
1942 aerial photographs	831.88	5737.62	237.39
1968 aerial photographs	1298.53	5399.63	108.73
1977 aerial photographs	1821.32	4655.71	329.86
1942–1977 change: +119.0 %
1998 SPOT image	1956.24	4323.47	527.18
2012 SPOT image	2640.69	3709.99	456.21
1998–2012 change: +35.0 %