R spatial indentify tool

Tue 23 September 2008

This is useful for visually exploring R spatial data such as SpatialPointDataFrames or SpatialGridDataFrames. By clicking on various features, the value at that point will be displayed.

y = readGDAL(system.file("pictures/Rlogo.jpg", package="rgdal")[1], band=1)
y.grid = y@grid
y.coords = coordinates(y.grid) 
identify(x=y.coords, y=NULL, n=1)

where x and y refer to coordinates (in this case because y.coords contains both x and y coordinates, y can be set to NULL), and n is the number of features to identify.

Helpful Tip

FOSS GIS How-To Linux R


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