Advanced Activities are designed to make you apply the skills you learned in this lesson to solve an environmental problem and/or explore additional resources related to lesson topics.
After looking at current aerial photos of the site, you realize that the density of tree cover varies across the study area. In fact, there are many parts of the study area that are not covered with trees. Historical aerial photos reveal that the forest is quite young and that many parts of the study area were used for agriculture until quite recently. Using aerial photos from the 1940s to the present, you create a shapefile showing areas of similar age and forest type (Vegetation07.shp in your L6 folder).
Given this new information, you realize that your original estimate of carbon sequestered by the forest is too large since many of the interpolated cells are located within areas that are not covered with trees. You decide to redo your interpolation to remove areas that are not forested from your results. What is your new estimate of carbon sequestered by the study forest?