Wrapper functions to allow more direct calling of rgdal C code

These functions allow more direct access to some of the rgdal C API. These are advanced methods intended for package developers only.

GDALcall(object, option, ...)
rawTransform(projfrom, projto, n, x, y, z=NULL, wkt=FALSE)

Arguments

object

GDALTransientDataset (option = 'SetGeoTransform', 'SetProject') or GDALRasterBand (the other options)
option

character. One of 'SetGeoTransform', 'SetProject', 'SetNoDataValue', 'SetStatistics', 'SetRasterColorTable' or 'SetCategoryNames')
...

additional arguments. The values to be set
projfrom

character. PROJ.4 coordinate reference system (CRS) description
projto

character. PROJ.4 CRS description
n

number of coordinates
x

x coordinates
y

y coordinates
z

z coordinates
wkt

default FALSE, if TRUE, the caller determines that projfrom and projto are wkt and that new_proj_and_gdal() returns TRUE to avoid multiple warnings when the function is called repetitively

Value

GDALcall does not return anything. rawTransform returns a matrix of transformed coordinates.

Author

Robert Hijmans