The ForestER module supports the estimation of carbon emissions from deforestation and forest degradation, including production of a report. In contrast to the CarbEF module, the ForestER performs a pixel-based calculation of emissions, using as input pixel-based forest maps at time1 and time2, as well as a pixel-based map of forest degradation. ForestER accommodates forest type and related biomass classes.
The ForestER module requires the following input:
User has to assign a percentage value of biomass loss caused by disturbed pixels; default value is 50%, meaning that for each mapped disturbed pixel half of the assumed biomass at time 2 is counted as loss and therefore emission. In case of deforestation events, disturbance has no effect.
Important notes: regarding the degradation activity data:
there are several reasons why it is better to use data stemming from the GEE Delta-rNBR tool instead of using the output of a two single date approach (as implemented in the Delta-rNBR module of the IMPACT toolbox):
Test dataset containing 2 forest maps, disturbance layer and biomass map (as on figure) is available here (10kb).
Maps are re-projected to equal area according to user’s choice for accurate area estimation. Analysis is only based on the intersecting area between the 2 forest maps (and biomass if provided) and by using the highest spatial resolution. Disturbance map can partially intersect. Eventual buffer introduced by the re-projection is considered as nodata.
In case of no valid observations (cloud, shadows, no imagery) or parts of the maps outside the region of interest (e.g. country border), is recommended to identify them with an unique value different from 0 (to be then set in the interface as well) so as the algorithm is able to mask it out during the area and emission estimation.
User defined forest classes are plotted using a green color ramp based on biomass: higer the biomass value, darker is the green tone.