1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
# PBSmapping utilities
SpatialPolygons2PolySet <- function(SpP) {
# require(PBSmapping)
if (!requireNamespace("PBSmapping", quietly = TRUE))
stop("package PBSmapping required for SpatialPolygons2PolySet")
pls <- slot(SpP, "polygons")
n <- length(pls)
PID <- NULL
SID <- NULL
POS <- NULL
X <- NULL
Y <- NULL
for (i in 1:n) {
srs <- slot(pls[[i]], "Polygons")
m <- length(srs)
for (j in 1:m) {
crds <- slot(srs[[j]], "coords")
k <- nrow(crds)
PID <- c(PID, rep(i, k))
SID <- c(SID, rep(j, k))
# POS <- c(POS, 1:k)
# Daniel Rodolphe Schlaepfer 140806
if(slot(srs[[j]], "hole")) POS <- c(POS, k:1)
else POS <- c(POS, 1:k)
X <- c(X, crds[,1])
Y <- c(Y, crds[,2])
}
}
PID <- as.integer(PID)
SID <- as.integer(SID)
POS <- as.integer(POS)
storage.mode(X) <- "double"
storage.mode(Y) <- "double"
pj <- .pbsproj(SpP)
zn <- NULL
if (pj == "UTM") {
zn <- attr(pj, "zone")
attr(pj, "zone") <- NULL
}
res <- PBSmapping::as.PolySet(data.frame(PID=PID, SID=SID, POS=POS,
X=X, Y=Y), projection=pj, zone=zn)
res
}
SpatialLines2PolySet <- function(SL) {
# require(maps)
pls <- slot(SL, "lines")
n <- length(pls)
PID <- NULL
SID <- NULL
POS <- NULL
X <- NULL
Y <- NULL
for (i in 1:n) {
srs <- slot(pls[[i]], "Lines")
m <- length(srs)
for (j in 1:m) {
crds <- coordinates(srs[[j]])
k <- nrow(crds)
PID <- c(PID, rep(i, k))
SID <- c(SID, rep(j, k))
POS <- c(POS, 1:k)
X <- c(X, crds[,1])
Y <- c(Y, crds[,2])
}
}
PID <- as.integer(PID)
SID <- as.integer(SID)
POS <- as.integer(POS)
storage.mode(X) <- "double"
storage.mode(Y) <- "double"
# require(PBSmapping)
if (!requireNamespace("PBSmapping", quietly = TRUE))
stop("package PBSmapping required for SpatialPolygons2PolySet")
pj <- .pbsproj(SL)
zn <- NULL
if (pj == "UTM") {
zn <- attr(pj, "zone")
attr(pj, "zone") <- NULL
}
res <- PBSmapping::as.PolySet(data.frame(PID=PID, SID=SID, POS=POS,
X=X, Y=Y), projection=pj, zone=zn)
res
}
.pbsproj <- function(Sobj) {
p4str <- proj4string(Sobj)
if (is.na(p4str)) return("1")
res <- grep("longlat", p4str, fixed=TRUE)
if (length(res) > 0L) return("LL")
res <- regexpr("utm", p4str, fixed=TRUE)
if (res > 0) {
val <- "UTM"
res <- regexpr("+zone=", p4str, fixed=TRUE)
sres <- substring(p4str, res+attr(res, "match.length"))
zn0 <- regexpr("[[:digit:]]+", sres)
attr(val, "zone") <- as.integer(substring(sres, zn0,
zn0+attr(zn0, "match.length")))
} else val <- "1"
val
}
PolySet2SpatialPolygons <- function(PS, close_polys=TRUE) {
if (!inherits(PS, "PolySet")) stop("not a PolySet object")
prj <- attr(PS, "projection")
if (is.null(prj)) stop("unknown coordinate reference system")
if (prj == "LL") p4s <- "+proj=longlat +ellps=WGS84"
else if (prj == "UTM") {
# apparent change in PBS object attributes
zn <- attr(prj, "zone")
if (is.null(zn)) zn <- attr(PS, "zone")
if (is.null(zn)) stop("no valid zone attribute")
p4s <- paste("+proj=utm +ellps=WGS84 +zone=", zn, sep="")
} else {
p4s <- as.character(NA)
warning("unknown coordinate reference system")
}
# stop("unknown coordinate reference system") 110310
hasPID <- "PID" %in% names(PS)
if (!hasPID) stop("object does not have PID column")
res0 <- split(PS, PS$PID)
hasSID <- "SID" %in% names(PS)
outPolygons <- vector(mode="list", length=length(res0))
if (hasSID) {
res1 <- lapply(res0, function(x) split(x, x$SID))
if (close_polys) res1 <- lapply(res1,
function(i) lapply(i, function(x) {
n <- nrow(x)
if (!isTRUE(identical(x$X[1], x$X[n])) ||
!isTRUE(identical(x$Y[1], x$Y[n]))) rbind(x, x[1,])
else x
})
)
# extra level added to fix bug found by A Lobos 080413
for (i in seq(along=outPolygons)) {
outPolygons[[i]] <- Polygons(lapply(res1[[i]], function(x)
Polygon(cbind(x$X, x$Y))), ID=names(res1)[i])
}
# PIDs added as IDs 080413
} else {
if (close_polys) res0 <- lapply(res0, function(x) {
n <- nrow(x)
if (!isTRUE(identical(x$X[1], x$X[n])) ||
!isTRUE(identical(x$Y[1], x$Y[n]))) rbind(x, x[1,])
else x
})
for (i in seq(along=outPolygons)) {
outPolygons[[i]] <- Polygons(list(Polygon(cbind(res0[[i]]$X,
res0[[i]]$Y))), ID=as.character(i))
}
}
outSP <- SpatialPolygons(outPolygons, proj4string=CRS(p4s))
outSP
}
PolySet2SpatialLines <- function(PS) {
if (!inherits(PS, "PolySet")) stop("not a PolySet object")
prj <- attr(PS, "projection")
prj <- attr(PS, "projection")
if (is.null(prj)) stop("unknown coordinate reference system")
if (prj == "LL") p4s <- "+proj=longlat +ellps=WGS84"
else if (prj == "UTM") {
# apparent change in PBS object attributes
zn <- attr(prj, "zone")
if (is.null(zn)) zn <- attr(PS, "zone")
if (is.null(zn)) stop("no valid zone attribute")
p4s <- paste("+proj=utm +ellps=WGS84 +zone=", zn, sep="")
} else {
p4s <- as.character(NA)
warning("unknown coordinate reference system")
}
# stop("unknown coordinate reference system") 110310
hasPID <- "PID" %in% names(PS)
if (!hasPID) stop("object does not have PID column")
res0 <- split(PS, PS$PID)
hasSID <- "SID" %in% names(PS)
outLines <- vector(mode="list", length=length(res0))
if (hasSID) {
res1 <- lapply(res0, function(x) split(x, x$SID))
for (i in seq(along=outLines)) {
outLines[[i]] <- Lines(lapply(res1[[i]], function(x)
Line(cbind(x$X, x$Y))), ID=as.character(i))
}
} else {
for (i in seq(along=outLines)) {
outLines[[i]] <- Lines(lapply(res0[[i]], function(x)
Line(cbind(res0[[i]]$X, res0[[i]]$Y))), ID=as.character(i))
}
}
outSP <- SpatialLines(outLines, proj4string=CRS(p4s))
outSP
}
|
