What　Is　It?　The　Raster　Terrain　Analysis　Plugin　calculates　the　slope,　aspect,　hillshade,　ruggedness　index　and　relief　for　digital　elevation　models　(DEM).　Slope:　Calculates　slope　angle　for　each　cell　in　degrees　(based　on　first　order　derivative　estimation).　Aspect:　Exposition　(starting　with　0　for　north　direction,　in　degrees　counterclockwise).　Hillshade:　Create　shaded　map　using　light　and　shadow　to　provide　a　more　three-dimensional　appearance　for　a　shaded　relief　map.　Ruggedness　Index:　A　quantitative　measurement　of　terrain　heterogeneity　as　described　by　Riley　et　al.　(1999).　It　is　calculated　for　every　location,　by　summarizing　the　change　in　elevation　within　the　3x3　pixel　grid.　Relief:　Creating　a　shaded　relief　map　from　digital　elevation　data.　Implemented　is　a　method　to　choose　the　elevation　colors　analysing　the　frequency　distribution.　How　To　Use　It　(Alaska　Example　&　Mills　Example):　Start　QGIS　and　load　the　raster　layer　(Alaska　example:　http://download.osgeo.org/qgis/data/　)　and　(Mills　example　raster