Description Usage Arguments Details Value Author(s) See Also Examples
Draws a simple random sample from a SpatialPolygons
or
SpatialPolygonsDataFrame
object.
1 | srs.polygon(x, n)
|
x |
A |
n |
Sample size. Number of locations to draw from the union of all
polygons contained in |
The SRS sample is drawn by generating uniform random deviates
for coordinates in the bounding box surrounding polygons
(e.g., c(xmin, ymin) + c(dx,dy)*runif(2)
), tossing
locations outside polygons
until the required number is achieved.
A SpatialPointsDataFrame
containing locations in the SRS sample,
in arbitrary order. Attributes of the sample points (in the
embedded data frame) are
as follows:
sampleID
: A unique identifier for every sample point.
geometryID
: The ID of the polygon in x
which each
sample point falls. The
ID of polygons in x
are row.names(geometry(x))
.
Any attributes of the original polygons (in x
).
Additional attributes of the output object, beyond those which
make it a SpatialPointsDataFrame
, are:
frame
: Name of the input sampling frame.
frame.type
: Type of resource in sampling frame. (i.e., "polygon").
sample.type
: Type of sample drawn. (i.e., "SRS").
Trent McDonald
bas.polygon
, sss.polygon
,
hip.polygon
, sdraw
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