Description Usage Arguments Details Value See Also Examples
Converts well-known binary (WKB) geometry representations to
Spatial
objects.
1 | readWKB(wkb, id = NULL, proj4string = CRS(as.character(NA)))
|
wkb |
|
id |
character vector of unique identifiers of geometries. The length of
|
proj4string |
projection string of class
|
Supported WKB geometry types are Point, LineString,
Polygon, MultiPoint, MultiLineString, and MultiPolygon. All elements in the
list
must have the same WKB geometry type. The
WKB geometry representations may use little-endian or big-endian
byte order.
The argument wkb
may also be a raw
vector
consisting of one WKB geometry representation. In that case, the
argument id
must have length one.
An object inheriting class Spatial
.
The return value may be an object of class
SpatialPoints
,
SpatialLines
,
SpatialPolygons
, or a list
in which each element is an object of class
SpatialPoints
. The class of the
return value depends on the WKB geometry type as shown in the
table below.
Type of WKB geometry | Class of return value |
Point | SpatialPoints |
LineString | SpatialLines |
Polygon | SpatialPolygons |
MultiPoint | list of SpatialPoints |
MultiLineString | SpatialLines |
MultiPolygon | SpatialPolygons |
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 | # create a list of WKB geometry representations of type Point
wkb <- list(
as.raw(c(0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xf0, 0x3f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x40)),
as.raw(c(0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40))
)
# convert to object of class SpatialPoints
obj <- readWKB(wkb)
# create a list of WKB geometry representations of type MultiPoint
wkb <- list(
as.raw(c(0x01, 0x04, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x01,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 0x3f,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x40)),
as.raw(c(0x01, 0x04, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x01,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40)))
# convert to list of objects of class SpatialPoints
obj <- readWKB(wkb)
# create a list of WKB geometry representations of type MultiLineString
wkb <- list(
as.raw(c(0x01, 0x05, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x02,
0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0xf0, 0x3f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x40)),
as.raw(c(0x01, 0x05, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x02,
0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0xf0, 0x3f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0,
0x3f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0xf8, 0x3f)))
# convert to object of class SpatialLines
obj <- readWKB(wkb)
# create a list of WKB geometry representations of type Polygon
wkb <- list(
as.raw(c(0x01, 0x03, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x05, 0x00,
0x00, 0x00, 0x34, 0x03, 0xf0, 0xac, 0xce, 0x66, 0x5d, 0xc0, 0x8f,
0x27, 0x95, 0x21, 0xab, 0xa6, 0x44, 0x40, 0xa0, 0x32, 0x81, 0x18,
0x78, 0x83, 0x5d, 0xc0, 0xc8, 0xd2, 0xa0, 0xee, 0x23, 0x0b, 0x41,
0x40, 0x80, 0xec, 0x72, 0x54, 0xde, 0xb1, 0x5f, 0xc0, 0xc8, 0xd2,
0xa0, 0xee, 0x23, 0x0b, 0x41, 0x40, 0xec, 0x1b, 0x04, 0xc0, 0x87,
0xce, 0x5f, 0xc0, 0x8f, 0x27, 0x95, 0x21, 0xab, 0xa6, 0x44, 0x40,
0x34, 0x03, 0xf0, 0xac, 0xce, 0x66, 0x5d, 0xc0, 0x8f, 0x27, 0x95,
0x21, 0xab, 0xa6, 0x44, 0x40)),
as.raw(c(0x01, 0x03, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x05, 0x00,
0x00, 0x00, 0x08, 0x36, 0xdc, 0x8b, 0x9f, 0x3d, 0x51, 0xc0, 0x0f,
0xb3, 0x2a, 0x6a, 0x3f, 0x1c, 0x46, 0x40, 0x47, 0xcb, 0x54, 0xe7,
0xcb, 0x5e, 0x51, 0xc0, 0x45, 0x81, 0x50, 0x31, 0xfa, 0x80, 0x42,
0x40, 0xa9, 0xba, 0x74, 0x6d, 0xf5, 0xa1, 0x53, 0xc0, 0x45, 0x81,
0x50, 0x31, 0xfa, 0x80, 0x42, 0x40, 0xe8, 0x4f, 0xed, 0xc8, 0x21,
0xc3, 0x53, 0xc0, 0x0f, 0xb3, 0x2a, 0x6a, 0x3f, 0x1c, 0x46, 0x40,
0x08, 0x36, 0xdc, 0x8b, 0x9f, 0x3d, 0x51, 0xc0, 0x0f, 0xb3, 0x2a,
0x6a, 0x3f, 0x1c, 0x46, 0x40)))
# convert to object of class SpatialPolygons
obj <- readWKB(wkb)
# specify id and proj4string
obj <- readWKB(
wkb,
id = c("San Francisco", "New York"),
proj4string = sp::CRS("+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs")
)
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