sgo-package | R Documentation |
The sgo package aims to help with spatial or geographic analysis in Open Source R and derivatives. Its main purpose is to perform OSGB36/ETRS89 transformations using the Ordnance Survey's OSTN15 transformation model for Great Britain and the Isle of Man. It also transforms GPS ellipsoid heights to orthometric (mean sea level) heights on the relevant Ordnance Survey mapping datum, using the National Geoid Model OSGM15.
Most of the functions available in this package will become much less accurate if used outside the coverage of OSTN, therefore it is advised to apply these functions on coordinates within Great Britain, the Isle of Man and any areas of sea less than a few miles off shore.
This package assumes that the Coordinate Reference Systems (CRS) ETRS89 and WGS84 are practically the same within the UK, but this shouldn't be a problem for most civilian use of GPS satellites. If a high-precision transformation between WGS84 and ETRS89 is required then it is recommended to use a different package to do the conversion.
sgo_points
: 2D/3D point coordinates
Functions to provide coordinate transformations:
sgo_bng_lonlat
: British National Grid (E/N) to Lon/Lat
sgo_lonlat_bng
: Lon/Lat to British National Grid (E/N)
sgo_bng_ngr
: British National Grid (E/N) to National Grid
References
sgo_ngr_bng
: National Grid References to British National
Grid (E/N)
sgo_laea_etrs
: ETRS89-LAEA Easting/Northing to ETRS89
sgo_etrs_laea
: ETRS89 to ETRS89-LAEA Easting/Northing
sgo_cart_lonlat
: 3D Earth Centred Earth Fixed (ECEF)
Cartesian coordinates to polar coordinates
sgo_lonlat_cart
: Polar coordinates to 3D ECEF
Cartesian coordinates
sgo_wgs84_en
: WGS84 Lon/Lat to Pseudo-Mercator (E/N)
sgo_en_wgs84
: Pseudo-Mercator (E/N) to WGS84 Lon/Lat
sgo_transform
: Wrapper for all the transformations above
sgo_coordinates
: Extract coordinates from a
sgo_points
object
sgo_area
: Calculate area from an ordered set of points
sgo_distance
: Calculate distance(s) between points
The OSTN15 transformation model is used in this package, and it is licensed
under the BSD Licence (http://opensource.org/licenses/bsd-license.php):
© Copyright and database rights Ordnance Survey Limited 2016, © Crown
copyright and database rights Land & Property Services 2016 and/or ©
Ordnance Survey Ireland, 2016. All rights reserved.
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