search for: spatialdataframe

Displaying 4 results from an estimated 4 matches for "spatialdataframe".

2003 Oct 31
0
A package for spatial data classes: request for comments
...t, called r-spatial. I first worked with Barry Rowlinson's spatial.data.frame (found in r-asp, or rasp, also on sourceforge), which is an S3 class. Then I restarted using S4 classes, because they are here to stay, and allow validation. Currently I defined three classes: + SpatialData +-- SpatialDataFrame +-- SpatialDataFrameGrid SpatialData is only meant as a base class; it only contains a bounding box (2D or 3D data), and information about projection (if present), anticipating (re)projecting facilities in Roger's proj4R package. SpatialDataFrame extends this class; holds a data frame...
2004 Jun 16
0
gstat 0.9-12: cokriging cross validation and class name incompatibilities
...r-spatial/ beta releases for the upcoming package sp are available; sp provides classes and methods for spatial data. Instead of: > library(gstat) > data(meuse) > variogram(zinc~1, ~x+y, meuse) you could, with package sp loaded, do: > coordinates(meuse) = ~x+y # promotes meuse to SpatialDataFrame > variogram(zinc~1, meuse) # no coordinates required. In addition, sp provides classes for gridded data and polygon data. With sp loaded, gstat can calculate variogram maps. Any comments are welcome, -- Edzer _______________________________________________ R-packages mailing list R-packages...
2004 Jun 16
0
gstat 0.9-12: cokriging cross validation and class name incompatibilities
...r-spatial/ beta releases for the upcoming package sp are available; sp provides classes and methods for spatial data. Instead of: > library(gstat) > data(meuse) > variogram(zinc~1, ~x+y, meuse) you could, with package sp loaded, do: > coordinates(meuse) = ~x+y # promotes meuse to SpatialDataFrame > variogram(zinc~1, meuse) # no coordinates required. In addition, sp provides classes for gridded data and polygon data. With sp loaded, gstat can calculate variogram maps. Any comments are welcome, -- Edzer _______________________________________________ R-packages mailing list R-packages...
2004 Apr 02
1
Winding Number
I have shapefiles for the state climatic divisions for the United States and read.shape brings them in wonderfully. Now I wish to run through a list of several thousand observation sites to find out in which division each is located. I figure that I can compute the winding number for each site and be done. However a search doesn't find any references and I can't find a winding number