27 Jan
2016
27 Jan
'16
00:32
Não consegui rodar, veja o que aconteceu aqui
> srdf=SpatialPolygonsDataFrame(sr,
+ data.frame(row.names=c('1','2','3','4'), PIDS=1:4)) srdf@data
Error: unexpected symbol in:
"srdf=SpatialPolygonsDataFrame(sr,
data.frame(row.names=c('1','2','3','4'), PIDS=1:4)) srdf"
>
Fantástico Éder!!
Na verdade só tinha um errinho em um mycoords que era my.coords,
Muito obrigado pela solução.
Segue problema resolvido:
### <code r>
require(rgdal)
require(maptools)
#-------------------------------------------------------------------------------
#Crio 4 polígonos
sr <- SpatialPolygons(list(
Polygons(list(Polygon(cbind(c(180114, 180553, 181127, 181477, 181294,
181007, 180409,
180162, 180114), c(332349, 332057, 332342, 333250, 333558, 333676,
332618, 332413, 332349)))),'1'),
Polygons(list(Polygon(cbind(c(180042, 180545, 180553, 180314, 179955,
179142, 179437,
179524, 179979, 180042), c(332373, 332026, 331426, 330889, 330683,
331133, 331623, 332152, 332357, 332373)))),'2'),
Polygons(list(Polygon(cbind(c(179110, 179907, 180433, 180712, 180752,
180329, 179875,
179668, 179572, 179269, 178879, 178600, 178544, 179046, 179110),
c(331086, 330620, 330494, 330265, 330075, 330233, 330336, 330004,
329783, 329665, 329720, 329933, 330478, 331062, 331086)))),'3'),
Polygons(list(Polygon(cbind(c(180304, 180403,179632,179420,180304),
c(332791, 333204, 333635, 333058, 332791)))),'4')))
plot(sr)
#Converto em polígono espacial
srdf=SpatialPolygonsDataFrame(sr,
data.frame(row.names=c('1','2','3','4'), PIDS=1:4))
srdf@data
#Criação do shapefile para ilustrar o problema
writeOGR(srdf, getwd(), 'POLY', 'ESRI Shapefile')
#Leitura do shapefile
cnt <- readShapeLines("POLY.shp")
plot(cnt, col=1)
as.data.frame(cnt)
# PIDS
# 0 1
# 1 2
# 2 3
# 3 4
str(cnt, max=3)
str(cnt@lines[[1]])
my.coords <- NULL
for (i in 1:length(cnt@lines)) {
for (j in 1:length(cnt@lines[[i]]))
df <- data.frame(cnt@lines[[i]]@Lines[[j]]@coords,
ID=cnt@lines[[i]]@ID)
my.coords <- rbind(my.coords, df)
}
my.coords
ch <- chull(my.coords)
my.hull <- my.coords[ch,]
points(my.hull, col="red")
lines(rbind(my.hull, my.hull[1,]))
### </code>
--
======================================================================
Alexandre dos Santos
Proteção Florestal
IFMT - Instituto Federal de Educação, Ciência e Tecnologia de Mato Grosso
Campus Cáceres
Caixa Postal 244
Avenida dos Ramires, s/n
Bairro: Distrito Industrial
Cáceres - MT CEP: 78.200-000
Fone: (+55) 65 8132-8112 (TIM) (+55) 65 9686-6970 (VIVO)
e-mails:alexandresantosbr@yahoo.com.br
alexandre.santos@cas.ifmt.edu.br
Lattes: http://lattes.cnpq.br/1360403201088680
OrcID: orcid.org/0000-0001-8232-6722
Researchgate: https://www.researchgate.net/profile/Alexandre_Santos10
LinkedIn: https://br.linkedin.com/in/alexandre-dos-santos-87961635
======================================================================
Em 25/01/2016 21:04, Éder Comunello escreveu:
> #-------------------------------------------------------------------------------
> #Crio 4 polígonos
>
> sr <- SpatialPolygons(list(
> Polygons(list(Polygon(cbind(c(180114, 180553, 181127, 181477, 181294,
> 181007, 180409,
> 180162, 180114), c(332349, 332057, 332342, 333250, 333558, 333676,
> 332618, 332413, 332349)))),'1'),
> Polygons(list(Polygon(cbind(c(180042, 180545, 180553, 180314, 179955,
> 179142, 179437,
> 179524, 179979, 180042), c(332373, 332026, 331426, 330889, 330683,
> 331133, 331623, 332152, 332357, 332373)))),'2'),
> Polygons(list(Polygon(cbind(c(179110, 179907, 180433, 180712, 180752,
> 180329, 179875,
> 179668, 179572, 179269, 178879, 178600, 178544, 179046, 179110),
> c(331086, 330620, 330494, 330265, 330075, 330233, 330336, 330004,
> 329783, 329665, 329720, 329933, 330478, 331062, 331086)))),'3'),
> Polygons(list(Polygon(cbind(c(180304, 180403,179632,179420,180304),
> c(332791, 333204, 333635, 333058, 332791)))),'4')))
> plot(sr)
>
> #Converto em polígono espacial
>
> srdf=SpatialPolygonsDataFrame(sr,
> data.frame(row.names=c('1','2','3','4'), PIDS=1:4))
> srdf@data
>
> #Criação do shapefile para ilustrar o problema
>
> writeOGR(srdf, getwd(), 'POLY', 'ESRI Shapefile')
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