The Forest Monitoring for Action (FORMA) project provides free and open forest clearing alert data derived from MODIS satellite imagery every 16 days beginning in 2006. FORMA is a project of World Resources Institute and was developed by the Center for Global Development.
FORMA data can be seen in action through the Global Forest Watch initiative, a collaboration between the World Resources Institute, Center for Global Development, Vizzuality, Google, University of Maryland, and Imazon. It's a project that brings transparency to forest conservation through early-warning alerting and long-term monitoring systems.
The FORMA software is written in the Clojure programming language and rides on Cascading and Cascalog for processing "Big Data" on top of Hadoop using MapReduce.