smartmap produces interactive maps from a variety of R objects with minimal coding required. This makes it great for previewing spatial data. It provides only three functions:
smap(): The core function. Smartly create leaflet maps from R
objects. Maps created with smap() contain two dialogues in
the top right corner: one for switching the background map and one for
measuring distances and areas.smart_as_sf(): Applies the same heuristics as
smap(), but returns sf objects instead.as_coord_matrix: Applies the same heuristics as
smap(), but returns a numeric matrix with longitude and
latitude instead.Viewing data.frames with longitude and latitude columns
was the basic use case for which smartmap was created. The heuristics
for automatically determining the geo-coordinate columns are simple, but
should work for most use cases.
#> city LaTituDE lng pop country province
#> 1 Bregenz 47.51670 9.766702 26928.0 Austria Vorarlberg
#> 2 Eisenstadt 47.83330 16.533297 13165.0 Austria Burgenland
#> 3 Wiener Neustadt 47.81598 16.249954 60621.5 Austria Niederösterreich
#> 4 Graz 47.07776 15.410005 242780.0 Austria Steiermark
#> 5 Klagenfurt 46.62034 14.310020 88588.0 Austria Kärnten
#> 6 Linz 48.31923 14.288781 265161.5 Austria Oberösterreich
#> 7 Salzburg 47.81048 13.040020 178274.0 Austria Salzburg
#> 8 Innsbruck 47.28041 11.409991 133840.5 Austria Tirol
#> 9 Vienna 48.20002 16.366639 2065500.0 Austria Wiensource: World Cities Database
smap() also works with file system paths or urls to
shapefiles. It even looks inside zip files if necessary!
Numeric vectors of length 2 are interpreted as longitude/latitude coordinate pairs. If you supply names, smap uses them to identify the correct order.
You can call smap() on existing leaflet objects to add
background tiles and a ruler for measuring distance
library(leaflet)
lf <- leaflet::leaflet(height=200) %>%
leaflet::addCircleMarkers(lng = 16.422524, lat = 48.185686)
lf
smap(lf)Everyone who has worked with simple features will know that it is
sometimes a bit awkward to convert between the different datatypes
provided by the package (sf::sf, sf::sfc and
sf::sfg). Toe remedy this smap() works
natively with all three.