BRIEF DESCRIPTION:
Vegetation loss (forested and non-forested) and secondary vegetation
- The primary input for the analysis were the annual Land Use and Land Cover (LULC) maps from Collection 2. The maps were adjusted by applying the following processes: a) Spatial filter of 0.5 hectares, b) Temporal filter, applying rules by biome.
Considering the adjustments made, the base year was set to 1999 to generate the data on vegetation loss and secondary vegetation.
Data were generated from this base year, as prior years' LULC maps contain more classification noise due to the limited number of satellite images.
- Taking the base year 1999 to initiate the algorithm's execution, vegetation loss and secondary vegetation events were established by analyzing the trajectory of each pixel according to the following criteria:
| Loss t = | VN t-2 |
| VN t-1 | |
| A t | |
| A t+1 | |
| Secondary vegetation t = | A t-2 |
| A t-1 | |
| VN t | |
| VN t+1 | |
| VN t+2 |
Where VN corresponds to any class of Natural Vegetation (Forest, Dry forest, Mangrove, Flooded Forest, Swamp or Flooded Rangeland, Rangeland/Herbaceous, Scrubland, and other non-forest formations), A corresponds to any class of Anthropogenic Use (Forest plantation, Pasture, Agriculture, Agroforestry Mosaic, Infrastructure, Mining, Aquaculture, Oil palm) and t = 1988,..., 2020.
- Based on the trajectory analysis along the time series, the algorithm assigns each pixel to one of the established classes for the product:
| Class | Description | Value |
| Anthropogenic | Pixel classified as anthropogenic that did not undergo changes until the year analyzed. | 1 |
| Primary Veg. | Indicates absence of vegetation loss, meaning natural vegetation that remains from the beginning of the series until the year of analysis. | 2 |
| Secondary Veg. | Areas with a history of anthropogenic use followed by a change to natural vegetation before the year of analysis. | 3 |
| Primary Veg. Loss | Areas that transition from Primary Vegetation to Anthropogenic in the year of analysis. | 4 |
| Recovery for Secondary Veg. | Areas with a history of Anthropogenic use followed by a change to natural vegetation specifically in the year of analysis. | 5 |
| Secondary Veg. Loss | Areas that change from Secondary Vegetation to Anthropogenic in the year of analysis. | 6 |
For more details on the methodology of the vegetation loss and secondary vegetation module, access this ATBD appendix: ATBD Methodology Vegetation Modules..