Estimate carbon emissions from forest cover, deforestation or land-use change at the national level. This mission will learn how to extract forest area by applying technical thresholds and minimum area requirements for canopy cover.
Status of existing forests:
The Food and Agriculture Organization of the United Nations (FAO) defines a forest as “land of more than 0.5 hectares with tree heights of more than 5 meters and a canopy cover of more than 10%, or trees capable of meeting these thresholds in situ. Excluding those used primarily for agriculture or Land for Urban Land Use” (FAO 2015).
Select country and set parameters
This tutorial uses Bolivia as an example, with a minimum canopy cover of 10% and a minimum forest area of 0.5 hectares (country definitions may vary). Depending on the location of the country, the number of pixels that make up a 0.5 hectare varies. You can adjust this by calculating the actual minimum area used
// 选择国家 (e.g. Canada).
var country = 'Canada';
//树冠覆盖率（如10%）。
var cc = ee.Number(10);
// 以像素为单位的最小森林面积（例如，6个像素，在本例中为0.5公顷）
var pixels = ee.Number(6);
// 树木损