A package providing classes and methods for spatial data: points,
lines, polygons and grids
Class "CRS" of coordinate reference system arguments
Class "DMS" for degree, minute, decimal second values
create objects of class SpatialLines or SpatialLinesDataFrame
a class for spatial lines with attributes
create objects of class SpatialPoints or SpatialPointsDataFrame
create objects of class SpatialPolygons or SpatialPolygonsDataFrame
Make SpatialPolygons object from GridTopology object
read/write to/from (ESRI) asciigrid format
blue-pink-yellow color scheme that prints well on black/white printers
Convert character vector to DMS-class object
sets spatial coordinates to create spatial data, or retrieves
spatial coordinates
retrieve or assign coordinate names for classes in sp
retrieve spatial dimensions from spatial data
rearrange data in SpatialPointsDataFrame or SpatialGridDataFrame 
for plotting with spplot (levelplot/xyplot wrapper)
specify spatial data as being gridded, or find out whether they are
Create N-S and E-W grid lines over a geographic region
image gridded spatial data, or convert to format for image
Sets or retrieves projection attributes on classes extending
SpatialData
Calculate aspect ratio for plotting geographic maps
Prediction Grid for Meuse Data Set, geographical coordinates
Methods for spatially overlay-ing points (grids) and polygons layers
spatial overlay for points, grids and polygons
panel and panel utility functions for spplot
Retrieve polygons from SpatialPolygonsDataFrame object
Methods for Function recenter in Package 'sp'
Euclidean or Great Circle distance between points
Plot methods for spatial data with attributes
sample point locations in (or on) a spatial object
find point pairs with equal spatial coordinates