# get data
library(osmextract)
#> Data (c) OpenStreetMap contributors, ODbL 1.0. https://www.openstreetmap.org/copyright.
#> Check the package website, https://docs.ropensci.org/osmextract/, for more details.
munich_multilines <- oe_get(
place = "Muenches",
layer = "multilinestrings",
provider = "bbbike",
extra_tags = "route"
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# Sia X1, ..., Xn un campione casuale estratto da X ~ N(0, 1). Dalla teoria | |
# dell'inferenza statistica, sappiamo che lo stimatore | |
# | |
# (n - 1) S^2 / sigma ^ 2= 1 / sigma ^ 2 * sommatoria di (x_i - x_medio) ^ 2 | |
# | |
# ha distribuzione Chi-quadrato con n - 1 gradi di liberta. Proviamo a | |
# verificare empiricamente questa affermazione. | |
m <- 1e4 # numero di simulazioni usate per approssimare la distribuzione | |
n <- 100 # numero di elementi nel campione |
suppressPackageStartupMessages({library(spatstat)})
vertices <- ppp(
c(0, 1, 2, 1, 1),
c(0, 1, 0, -1, 0),
window = owin(c(-1, 3), c(-2, 2))
)
#matrice di adiacenza
library(stars)
#> Loading required package: abind
#> Loading required package: sf
#> Linking to GEOS 3.13.0, GDAL 3.10.1, PROJ 9.5.1; sf_use_s2() is TRUE
# Download global NDVI data which average the values from 2024-05-01 to 2024-05-10
options(timeout = 1200)
tmp_nc <- tempfile(fileext = ".nc")
download.file(
# Packages
library(sf)
#> Linking to GEOS 3.13.0, GDAL 3.10.1, PROJ 9.5.1; sf_use_s2() is TRUE
# Let's work on the unit square
unit_square <- st_as_sfc(st_bbox(c(xmin = 0, xmax = 1, ymin = 0, ymax = 1)))
# Let's divide the unit square into 1600 (regular) cells
cells <- st_as_sf(st_make_grid(unit_square, cellsize = c(0.025, 0.025)))
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