![[R logo]](../../../doc/html/Rlogo.svg)
![[Up]](../../../doc/html/left.jpg)
![[Top]](../../../doc/html/up.jpg)
| add_gps_to_rayshader | Adds a GPS trace to a 'rayshader' scene |
| crop_raster_square | Crops a raster and returns a smaller square raster |
| crop_raster_track | Crops a raster into a rectangle surrounding a set of lat long points |
| dplyr_data | .data to allow column name use in dplyr |
| drybrush | Simulates a dry brushing effect. Differs from elevation_transparency() in that colour is applied based on local altitude peaks, not across the whole raster |
| elevation_shade | Produces an elevation shaded image from a raster |
| elevation_transparency | Turns overlay images transparent based on altitude. Can be used to create an image overlay that will only apply to valleys, or only to hills. |
| example_igc | Returns an example IGC file using read_igc() |
| example_raster | Returns an example digital elevation model raster file() |
| get_slippy_map | Obtains and merges map tiles from various sources using the 'slippymath' package |
| ggslippy | Adds a layer created using slippy_overlay() or slippy_raster() to a 'ggplot2' chart |
| latlong_to_rayshader_coords | Converts WGS84 lat long points into 'rayshader' coordinates. Useful for adding arbitrary points and text to a 'rayshader' scene. |
| mapbox_dem | Gets Digital Elevation Model (DEM) data from 'mapbox' |
| mapzen_dem | Gets Digital Elevation Model (DEM) data from 'mapzen' via 'Amazon Public Datasets' |
| mosaic_files | Stitches together files into a single raster Requires a target directory of files that can be read with raster::raster(), e.g. .asc files, or a directory of .zip files containing these files |
| raster_zscale | Approximates the zscale of a raster Digital Elevation Model for 'rayshader' |
| read_igc | Load an IGC file |
| slippy_overlay | Creates an overlay image from 'Mapbox' or 'Stamen' Maps using the 'slippymath' package |
| slippy_raster | Creates a square raster centred on any lat long point, or a rectangular raster surrounding a set of lat long points from 'Mapbox', 'Mapzen' or 'Stamen' Maps using the 'slippymath' package |