MapBiomas uses for its satellite images the standard representation of Google Earth Engine (Latitude/Longitude and datum WGS84). Therefore, the size of each pixel varies depending on its latitude. Landsat pixels have an approximate spatial resolution of 30 meters, which translates to an area of 900 square meters per pixel. However, it is not recommended to calculate the area simply by multiplying the number of pixels by 900 square meters. This generates inaccuracies in the results.

To improve accuracy in area calculation, MapBiomas uses the ee.Image.pixelArea() function of Google Earth Engine, which generates an image where the value of each pixel represents its area in square meters, taking into account the projection and spatial resolution of the original image.