MapBiomas uses the standard representation of Google Earth Engine for its satellite images (Latitude/Longitude and WGS84 datum). 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, as this can lead to inaccuracies in the results.

To improve accuracy in area calculation, MapBiomas employs the Google Earth Engine function ee.Image.pixelArea() 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