rCarto

#' Aggregate sf objects
#' 
#' Geometries and attributes are aggregated. 
#' 
#' @param x sf object
#' @param by name of the variable of grouping elements
#' @param var name(s) of the variable(s) to aggregate
#' @param fun function(s) to compute the summary statistics
#'
#' @return An sf object is returned

rCarto

# Your Stadia API key:
apikey = "xxxxxxxxxxxxxxxxxxxxxxx"

# Define a bounding box
library(sf)
bb <- st_bbox(obj = c(xmin = 24.73592, xmax = 24.75185, 
                      ymin = 59.4340, ymax = 59.4393), 
              crs = "EPSG:4326")

rCarto

orthomap <- function(lon, lat) {
  g <- as_s2_geography(TRUE)
  co <- s2_data_countries()
  oc <- s2_difference(g, s2_union_agg(co)) # oceans
  co <- s2_difference(co, s2_union_agg(oc)) # land
  
  # visible half
  b <- s2_buffer_cells(as_s2_geography(paste0("POINT(", lon, " ", lat,")")),
                       distance = 9800000)

rCarto

library(rnaturalearth)
library(mapsf)
library(fisheye)
ct <- ne_download(scale = 50, returnclass = "sf")
oc <- ne_download(type = "ocean", category = "physical", 
                  scale = 50, returnclass = "sf")
x <- st_transform(ct, "+proj=natearth2")
z <- st_transform(oc, "+proj=natearth2")

rCarto

library(mapsf)
#> Le chargement a nécessité le package : sf
#> Linking to GEOS 3.7.1, GDAL 3.1.2, PROJ 7.1.0
mtq <- mf_get_mtq()
mf_theme("nevermind")
mf_map(mtq, graticule = st_crs(4326), 
       axes = TRUE, 
       lon = seq(-60,-62, by=-.2), 
 lat = seq(14, 15, by = .2))

rCarto

library(sf)
library(osrm)
library(maptiles)
# build a bbox for Paris
bb <- st_bbox(c(xmin = 643069, ymin = 6857478, 
                xmax = 661079, ymax = 6867081),
              crs = 2154)
# get map tiles 
osm <- get_tiles(x = bb, provider = "CartoDB.PositronNoLabels", 
                 crop = TRUE, zoom = 13)

rCarto

library(sf)
library(elevatr)
library(raster)
library(tanaka)
# a polygon of bangalore
bangalore <- st_read("export.geojson")
elevation <- get_elev_raster(bangalore, z = 10)
bangalore_elevation <- trim(mask(elevation, bangalore))

# inspect min and max values

rCarto

library(rnaturalearth)
library(cartography)
library(sf)

lakes <- ne_download(scale = 10, type = "lakes", category = c("physical"), 
                     destdir = tempdir(), load = TRUE, returnclass = c("sf"))
countries <- ne_download(scale = 10, type = "countries", 
                         category = c("cultural"), destdir = tempdir(), 
                         load = TRUE, returnclass = c("sf"))
countries <- st_transform(countries, "ESRI:54017")

rCarto

library(units)
library(sf)
library(cartography)

# library(osmdata)
# 
# # define a bounding box
# q0 <- opq(bbox = c(2.2247, 48.8188, 2.4611, 48.9019)) 
# 
# # extract Paris boundaries

rCarto

library(sf)
nc = st_read(system.file("shape/nc.shp", package="sf"))
nc <- st_transform(nc, 32119)
# regular grid 512096 polygons
grid <- st_make_grid(x = nc, cellsize = 500)

t0 <- Sys.time()
plot(st_geometry(nc))
plot(grid, add = TRUE)
# end of the second plot