Study site and imagery | Class and area of cover (ha), at original image pixel size | ||
---|---|---|---|
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 photographsa | |||
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 % |