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Erich Neuwirth writes: > Is there code for bivariate kernel density estimation? > ... > but none of them seems to accept a weight parameter In package 'spatstat' the function density.ppp performs weighted kernel smoothing, including bivariate kernel density estimation. At the moment...

A full set of course notes on 'Analysing spatial point patterns in R' is now available at <http://www.csiro.au/resources/pf16h.html> The course is based on the package 'spatstat'. It includes a brief introduction to R, a...

A full set of course notes on 'Analysing spatial point patterns in R' is now available at <http://www.csiro.au/resources/pf16h.html> The course is based on the package 'spatstat'. It includes a brief introduction to R, a...

> I need to generate (randomly) n points inside the boundary of a polygon, > is there any function that can handle this? For this kind of functionality, use the `spatstat' package which offers (for example) rpoint Generate N Random Points runifpoint...

Sorry, I misspoke, ... in spatstat the correct way to convert a 0/1 valued image to a window is to use 'solutionset'. Example: my.window <- solutionset(my.image == 1) my.distmap <- distmap(my.window) The first line computes the region...

Can anyone suggest a simple way to calculate a 'hash code' from an arbitrary R object? hash(x) should return an integer or string with the property that if hash(x) != hash(y) then x and y are not identical...

Jan Quets Jan.Quets at ua.ac.be writes: > I want to make a rectangular window with circular holes within. > I have tried and searched but not found a solution yet. library(spatstat) R <- owin(c(0,4),c(0...

Mike Elliott wrote: > can anyone suggest functions/packages that allow interpolation / smoothing > of point data (without using raster grids)? i.e. which give the results at the > original point locations. The next version of spatstat (version 1.15-3) contains...

Kitty Lee<lee.kitty at yahoo.com> wrote: > I'm wondering is there a package in R that has similar functions as SaTscan? In particular, I'm looking for space-time cluster detection. Scan statistics for spatial (and space-time...

Version 1.9-4 of package 'spatstat' has been sent to CRAN. It includes new code for perfect simulation of point processes and various improvements. The release notes are available at <http://www.spatstat.org/spatstat/current/spatstatRELEASE-NOTES-1...

Ben Tupper writes: > This dataset provides an interesting spatial puzzle because the points > for a specific wall on a given date are not ordered. Assuming that > the points could be ordered into LINESTRING, the problem is how to do it...

> From: Martin Maechler <maechler at stat.math.ethz.ch> > maybe Adrian save()s that data.frame susequently? > Then, I assume the environment will copied. > In all(?) other circumstances that should only be a pointer and > not really use much memory...

Andy Bunn <Andy.Bunn at wwu.edu> writes: > I'd love to hear about data sets that some of you might use to teach >spatial in R. For spatial point patterns, the ?spatstat' package contains over 50 datasets, with documentation...

Mathieu Rajerison and Michael Sumner reported two bugs arising when a pattern of line segments is plotted. Mike traced the bugs to spatstat:::plot.psp and spatstat:::pointsOnLines. Errors occurred if a mark value was NA or if a segment...

Mark Trinder <Mark.Trinder at rpsgroup.com> writes: > Is there a way to output the coordinates of the intersections of two > polygons? In the 'spatstat' package, if A and B are two polygons (objects of class 'owin' with type 'polygonal...

A full set of course notes on 'Analysing spatial point patterns in R' is now available at <http://www.csiro.au/resources/pf16h.html> The course is based on the package 'spatstat'. It includes a brief introduction to R, a...

spatstat 1.11-0 Version 1.11-0 of package 'spatstat' is now available. Spatstat is a package for the analysis of spatial data, mostly point pattern data. See <www.spatstat.org> Important changes in version 1.11-0: New...

"Rainer M. Krug" writes: > I want to extract the points from an object of type ppp. > How can I do this? If `p' is an object of class "ppp" in spatstat, then p$x and p$y are vectors containing...

Haiyong Xu <xuhy at ucla.edu> writes: > Is there any package which can calculate the overlapping area of two > polygons or output the coordinates of the overlapping of two polygons? The function overlap.xypolygon(A,B) in package 'spatstat' calculates...

Version 1.1-8 of package 'scuba' has been uploaded to CRAN. 'scuba' is a package for scuba diving calculations and decompression models. It supports dive profiles (tables, plotting etc), analysis of dive profiles using decompression models, gas toxicity calculations...