tmap element
Building block for drawing thematic maps. All element functions have the prefix tm_.
The fundamental, and hence required element is tm_shape, which specifies the shape object, and also specifies the projection and bounding box.
The elements that serve as aesthetics layers are
Base layers:
tm_polygons
|
Create a polygon layer (with borders) |
tm_symbols
|
Create a layer of symbols |
tm_lines
|
Create a layer of lines |
tm_raster
|
Create a raster layer |
tm_text
|
Create a layer of text labels |
tm_basemap
|
Create a layer of basemap tiles |
tm_tiles
|
Create a layer of overlay tiles |
Derived layers:
tm_fill
|
Create a polygon layer (without borders) |
tm_borders
|
Create polygon borders |
tm_bubbles
|
Create a layer of bubbles |
tm_squares
|
Create a layer of squares |
tm_dots
|
Create a layer of dots |
tm_markers
|
Create a layer of markers |
tm_iso
|
Create a layer of iso/contour lines |
tm_rgb
|
Create a raster layer of an image |
The layers can be stacked by simply adding them with the + symbol. The combination of the elements described above form one group. Multiple groups can be stacked. Each group should start with tm_shape.
Attributes layers:
tm_grid
|
Create grid lines |
tm_scale_bar
|
Create a scale bar |
tm_compass
|
Create a map compass |
tm_credits
|
Create a text for credits |
tm_logo
|
Create a logo |
tm_xlab and tm_ylab
|
Create axis labels |
tm_minimap
|
Create a minimap (view mode only) |
Layout element:
tm_layout
|
Adjust the layout (main function) |
tm_legend
|
Adjust the legend |
tm_view
|
Configure the interactive view mode |
tm_style
|
Apply a predefined style |
tm_format
|
Apply a predefined format |
| --------------------------- | --------------------------------------------------------------------------------------------------- |
Tennekes, M., 2018, tmap: Thematic Maps in R, Journal of Statistical Software, 84(6), 1-39, doi: 10.18637/jss.v084.i06
The examples in each of the element functions
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