| as_data | transform Raster* to data frame ready for ggplot2 | 
| extent_as_poly | Transform raster extent to polygon | 
| power_to_angle | Transform flow directions powers of 2 to angular data | 
| scale_fill_continuous | Smooth gradient between two colours | 
| scale_fill_discrete | Qualitative colour scale | 
| scale_fill_diverge | Smooth gradient for diverging data | 
| theme_fullframe | A minimalist ggplot2 theme for ploting rasters Adapted from... | 
| theme_geographic | A minimalist ggplot2 theme for ploting geographic rasters... | 
| visualraster | Visual Raster Cheatsheet | 
| vr_geom_line | Custom visual raster line plot | 
| vr_geom_point | Custom visual raster point plot | 
| vr_geom_polygon | Custom visual raster polygon plot | 
| vr_geom_raster | Custom plot for Visual Raster | 
| vr_geom_raster_div | Custom visual raster plot for diverging data | 
| vr_geom_raster_seq | Custom visual raster plot for sequential data | 
| vr_geom_text | Custom visual raster text plot (for raster values and... | 
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