vec2dtransf-package: 2D Cartesian Coordinate Transformation
In vec2dtransf: 2D Cartesian Coordinate Transformation
vec2dtransf-package R Documentation
2D Cartesian Coordinate Transformation
Description
This package provides classes for defining and applying both
affine and similarity transformations on vector spatial data (sp objects).
Transformations can be defined from control points or directly from
parameters. If redundant control points are provided Least Squares is
applied allowing to obtain residuals and RMSE.
Details
This package helps to define a transformation object (either similarity or
affine) from control points or directly from parameters. Similarity
transformations can rotate, shift and scale geometries whereas affine
transformations can rotate, shift, scale (even applying different factors on
each axis) and skew geometries.
If control points are provided, the 'calculateParameters' method must be used in
order to calculate the transformation parameters. If there are more control
points than required (2 for similarity and 3 for affine) Least Squares is
applied and therefore residuals as well as Root Mean Square Error (RMSE) are
available via 'getResiduals' and 'getRMSE' methods. Parameters can always be
accessed via 'getParameters' method.
Once parameters are known, sp objects can be transformed by usign the
'applyTransformation' method. Supported sp objects are SpatialPoints,
SpatialPointsDataFrame, SpatialLines, SpatialLinesDataFrame, SpatialPolygons and
SpatialPolygonsDataFrame.
Additionally, the method 'plotGridTransformation' can plot a grid of points to
see the effect of the transformation on a given extent.
Author(s)
German Carrillo (http://geotux.tuxfamily.org)
Maintainer: German Carrillo <geotux_tuxman@linuxmail.org>
References
Iliffe, J. and Lott, R. Datums and map projections: For remote sensing,
GIS and surveying. Section 4.5. pp.109-117,135-137, 2008.
UC Davis Soil Resource Laboratory. Case Study: Fixing Bad TIGER Line data
with R and PostGIS.
<URL: http://casoilresource.lawr.ucdavis.edu/drupal/node/433>
Knippers, R. 2D Cartesian coordinate transformations. 2009.
<URL: http://kartoweb.itc.nl/geometrics/Coordinate%20transformations/coordtrans.html>
Pebesma, E. and Bivand, R. sp package:
<URL: http://cran.r-project.org/web/packages/sp/index.html>
vec2dtransf documentation built on Aug. 23, 2023, 5:07 p.m.
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| vec2dtransf-package | R Documentation |
2D Cartesian Coordinate Transformation
Description
This package provides classes for defining and applying both affine and similarity transformations on vector spatial data (sp objects). Transformations can be defined from control points or directly from parameters. If redundant control points are provided Least Squares is applied allowing to obtain residuals and RMSE.
Details
This package helps to define a transformation object (either similarity or affine) from control points or directly from parameters. Similarity transformations can rotate, shift and scale geometries whereas affine transformations can rotate, shift, scale (even applying different factors on each axis) and skew geometries.
If control points are provided, the 'calculateParameters' method must be used in order to calculate the transformation parameters. If there are more control points than required (2 for similarity and 3 for affine) Least Squares is applied and therefore residuals as well as Root Mean Square Error (RMSE) are available via 'getResiduals' and 'getRMSE' methods. Parameters can always be accessed via 'getParameters' method.
Once parameters are known, sp objects can be transformed by usign the 'applyTransformation' method. Supported sp objects are SpatialPoints, SpatialPointsDataFrame, SpatialLines, SpatialLinesDataFrame, SpatialPolygons and SpatialPolygonsDataFrame.
Additionally, the method 'plotGridTransformation' can plot a grid of points to see the effect of the transformation on a given extent.
Author(s)
German Carrillo (http://geotux.tuxfamily.org)
Maintainer: German Carrillo <geotux_tuxman@linuxmail.org>
References
Iliffe, J. and Lott, R. Datums and map projections: For remote sensing,
GIS and surveying. Section 4.5. pp.109-117,135-137, 2008.
UC Davis Soil Resource Laboratory. Case Study: Fixing Bad TIGER Line data
with R and PostGIS.
<URL: http://casoilresource.lawr.ucdavis.edu/drupal/node/433>
Knippers, R. 2D Cartesian coordinate transformations. 2009.
<URL: http://kartoweb.itc.nl/geometrics/Coordinate%20transformations/coordtrans.html>
Pebesma, E. and Bivand, R. sp package:
<URL: http://cran.r-project.org/web/packages/sp/index.html>
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Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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