I am creating a series of maps based on the Global forest resources assessment 2010 (FRA). A first example is the map below with the forest and woodland cover per country as percentage of the total land area. The pie charts show the proportion of the forest-woodland area covered by forest and the portion covered by woodland per country. There are obviously other, and possible better, ways to present this information, but I wanted to try out and demonstrate the use of chart overlay in QGIS. Continue reading
About a year ago I wrote a post about how to make a map showing deforestation rates in Africa based on the Global Forest Assessment 2005 by the Food and Agriculture Organization of the United Nation (FAO). The main purpose was to show how this could be done in R. It has since become the most viewed post on my blog, mostly by people looking for maps on deforestation or forest cover in Africa.
Recently I received an excel file with the coordinates of 144 vegetation sample plots, with the request to get the altitude values for the plots. For those with little experience in GIS, this is easy enough in most GIS programs. Here is a simple tutorial/example how to extract raster values at point locations in QGIS. Continue reading