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November 14, 2018 16:20
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# http://r-br.2285057.n4.nabble.com/R-br-Ler-MAP-no-R-Shapefile-td4661880.html | |
# http://www2.datasus.gov.br/DATASUS/tabwin/DocTabWin.htm | |
# http://datasus.saude.gov.br/versao-3 | |
# http://www2.datasus.gov.br/DATASUS/tabwin/rx/Importa_mapa.htm | |
# http://datasus.saude.gov.br/cadastros-nacionais/294-download-mapas-tabwin | |
read.map = function(filename){ | |
zz=file(filename,"rb") | |
# | |
# header do .map | |
# | |
versao = readBin(zz,"integer",1,size=2) # 100 = versao 1.00 | |
#Bounding Box | |
Leste = readBin(zz,"numeric",1,size=4) | |
Norte = readBin(zz,"numeric",1,size=4) | |
Oeste = readBin(zz,"numeric",1,size=4) | |
Sul = readBin(zz,"numeric",1,size=4) | |
geocodigo = "" | |
nome = "" | |
xleg = 0 | |
yleg = 0 | |
sede = FALSE | |
poli = list() | |
i = 0 | |
# | |
# repete para cada objeto no arquivo | |
# | |
repeat{ | |
tipoobj = readBin(zz,"integer",1,size=1) # 0=Poligono, 1=PoligonoComSede, 2=Linha, 3=Ponto | |
if (length(tipoobj) == 0) break | |
i = i + 1 | |
Len = readBin(zz,"integer",1,size=1) # length byte da string Pascal | |
geocodigo[i] = readChar(zz,10) | |
Len = readBin(zz,"integer",1,size=1) # length byte da string Pascal | |
nome[i] = substr(readChar(zz,25),1,Len) | |
xleg[i] = readBin(zz,"numeric",1,size=4) | |
yleg[i] = readBin(zz,"numeric",1,size=4) | |
numpontos = readBin(zz,"integer",1,size=2) | |
sede = sede || (tipoobj = 1) | |
x=0 | |
y=0 | |
for (j in 1:numpontos){ | |
x[j] = readBin(zz,"numeric",1,size=4) | |
y[j] = readBin(zz,"numeric",1,size=4) | |
} | |
# NAs separam v?rios pol?gonos no mesmo objeto | |
# BUG a corrigir: Assim como est? o primeiro pol?gono n?o fecha e, em multiplos poligonos, h? um NA a mais no final | |
xInic = x[1] | |
yInic = y[1] | |
for (j in 2:numpontos){ | |
if (x[j] == xInic & y[j] == yInic) {x[j]=NA; y[j] = NA} | |
} | |
poli[[i]] = c(x,y) | |
dim(poli[[i]]) = c(numpontos,2) | |
} | |
class(poli) = "polylist" | |
attr(poli,"region.id") = geocodigo | |
attr(poli,"region.name") = nome | |
attr(poli,"centroid") = list(x=xleg,y=yleg) | |
attr(poli,"sede") = sede | |
attr(poli,"maplim") = list(x=c(Oeste,Leste),y=c(Sul,Norte)) | |
close(zz) | |
return(poli) | |
} | |
datasus_as_st <- function(map_file){ | |
map_datasus <- read.map(map_file) | |
lst_polygon <- purrr::map(map_datasus, ~sp::Polygon(na.omit(.))) | |
# function to convert Polygon-class to Polygons-class | |
foo <- function(x, y) sp::Polygons(list(x), ID = y) | |
id_cidades <- paste0(attributes(map_datasus)$region.id, | |
";", | |
attributes(map_datasus)$region.name) | |
x <- purrr::map2(lst_polygon, | |
id_cidades, | |
foo) | |
geo <- sf::st_as_sf(sp::SpatialPolygons(x)) | |
geo[["cidade"]] <- id_cidades | |
geo | |
} | |
dir("data/mapbr/") | |
mapa_br_municipios <- datasus_as_st("data/mapbr/BR.MAP") | |
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