Update plot_map function for simple map plots using leaflet and mapview

[gareth-j]

• Summary of changes (Bug fix, feature, docs update, ...)

This adds a new backend package to plot_map function which uses mapview to plot raster and spatial data on a map. It allows very little customisation but is often more forgiving of data. plot_map by default with use leaflet and and still contains all the customisation features. The backend package can be selected using backend="leaflet" or backend="mapview".

• Please check if the PR fulfills these requirements

• Closes Raster layer doesn't show in plot_map() #254
• Vignettes updated/added
• Added an entry in the latest CHANGELOG.md file if fixing a bug or adding a new feature
• Any new libraries added to DESCRIPTION

[aabelean]

Looks really nice, @gareth-j. Pity plot_map_mapview doesn't plot filled polygons as the leaflet version. It did work for all my rasters except those rasters created by terra::rasterize as it gave an error like

Error in loadNamespace(x) : there is no package called ‘stars’

A work-around is to apply raster::raster, which makes it work without issues. plot_map_leaflet worked just fine without this step.

[gareth-j]

Looks really nice, @gareth-j. Pity plot_map_mapview doesn't plot filled polygons as the leaflet version. It did work for all my rasters except those rasters created by terra::rasterize as it gave an error like

Error in loadNamespace(x) : there is no package called ‘stars’

A work-around is to apply raster::raster, which makes it work without issues. plot_map_leaflet worked just fine without this step.

Ah excellent, thanks for taking a look. I've just updated this PR to use the backend = "leaflet" argument by default and allow users to just use plot_map(...) to plot normal leaflet maps. If they want to use mapview they can pass "mapview". I thought it made it a bit tider.