Appends columns with positions to a data table, based on an area code.
Coordinates are retrieved from a SpatialPolygonsDataFrame and not calculated
the exact defintion of the coordinates depend on how the polygons were constructed.
Datum and projection is not enforced, but a warning is issued if 'areaPolygons' does not pass some checks to verify that it is not a planar projection.
Usage
appendPosition(
table,
areaPolygons,
areaName,
latColName,
lonColName,
StratumName = "StratumName"
)Arguments
- table
data.table to be annotated.
- areaPolygons
- areaName
name of column that identifies the area in 'table'
- latColName
name of the latitdue column to be appended to 'table'
- lonColName
name of the longitude column to be appended to 'table'
- StratumName
name of the column in 'areaPolygons' that identifies the area.