Table 2. Comparison of different assessments of the world’s intact forest area (within the forest zone).
| |
| |
|
Type of intact area |
Minimum size, km2 |
Main data source |
Proportion intact, % |
| |
|
Wilderness areas (McCloskey and Spalding 1989) |
4000 |
Jet Navigation Charts |
21.1 |
|
Frontier forests (Bryant et al. 1997) |
Inconsistent, but >500 |
Expert information |
21.8 |
|
Areas with minimal (0–10) human influence index derived from Human
Footprint data set (Sanderson et al. 2002) |
500 |
Coarse-scale global maps and low spatial resolution remote-sensing data
analysis results |
38.0 |
|
Intact Forest Landscapes (this study) |
500 |
High spatial resolution satellite images |
23.5 |
|
| |
|